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README.md
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README.md
@ -51,113 +51,117 @@ LCTT的组成
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* 2014/12/25 提升runningwater为Core Translators成员。
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* 2015/04/19 发起 LFS-BOOK-7.7-systemd 项目。
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* 2015/06/09 提升ictlyh和dongfengweixiao为Core Translators成员。
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* 2015/11/10 提升strugglingyouth、FSSlc、Vic020、alim0x为Core Translators成员。
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活跃成员
|
||||
-------------------------------
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||||
|
||||
目前 TP 活跃成员有：
|
||||
- CORE @wxy,
|
||||
- CORE @carolinewuyan,
|
||||
- CORE @DeadFire,
|
||||
- CORE @geekpi,
|
||||
- CORE @GOLinux,
|
||||
- CORE @reinoir,
|
||||
- CORE @bazz2,
|
||||
- CORE @zpl1025,
|
||||
- CORE @ictlyh,
|
||||
- CORE @dongfengweixiao
|
||||
- CORE @carolinewuyan,
|
||||
- CORE @strugglingyouth,
|
||||
- CORE @FSSlc
|
||||
- CORE @zpl1025,
|
||||
- CORE @runningwater,
|
||||
- CORE @bazz2,
|
||||
- CORE @Vic020,
|
||||
- CORE @dongfengweixiao,
|
||||
- CORE @alim0x,
|
||||
- Senior @reinoir,
|
||||
- Senior @tinyeyeser,
|
||||
- Senior @vito-L,
|
||||
- Senior @jasminepeng,
|
||||
- Senior @willqian,
|
||||
- Senior @vizv,
|
||||
- @ZTinoZ,
|
||||
- @Vic020,
|
||||
- @runningwater,
|
||||
- @KayGuoWhu,
|
||||
- @luoxcat,
|
||||
- @alim0x,
|
||||
- @2q1w2007,
|
||||
- @theo-l,
|
||||
- @FSSlc,
|
||||
- @su-kaiyao,
|
||||
- @blueabysm,
|
||||
- @flsf,
|
||||
- @martin2011qi,
|
||||
- @SPccman,
|
||||
- @wi-cuckoo,
|
||||
- @Linchenguang,
|
||||
- @linuhap,
|
||||
- @crowner,
|
||||
- @Linux-pdz,
|
||||
- @H-mudcup,
|
||||
- @yechunxiao19,
|
||||
- @woodboow,
|
||||
- @Stevearzh,
|
||||
- @disylee,
|
||||
- @cvsher,
|
||||
- @wwy-hust,
|
||||
- @johnhoow,
|
||||
- @felixonmars,
|
||||
- @TxmszLou,
|
||||
- @shipsw,
|
||||
- @scusjs,
|
||||
- @wangjiezhe,
|
||||
- @hyaocuk,
|
||||
- @MikeCoder,
|
||||
- @ZhouJ-sh,
|
||||
- @boredivan,
|
||||
- @goreliu,
|
||||
- @l3b2w1,
|
||||
- @JonathanKang,
|
||||
- @NearTan,
|
||||
- @jiajia9linuxer,
|
||||
- @Love-xuan,
|
||||
- @coloka,
|
||||
- @owen-carter,
|
||||
- @luoyutiantang,
|
||||
- @JeffDing,
|
||||
- @icybreaker,
|
||||
- @tenght,
|
||||
- @liuaiping,
|
||||
- @mtunique,
|
||||
- @rogetfan,
|
||||
- @nd0104,
|
||||
- @mr-ping,
|
||||
- @szrlee,
|
||||
- @lfzark,
|
||||
- @CNprober,
|
||||
- @DongShuaike,
|
||||
- @ggaaooppeenngg,
|
||||
- @haimingfg,
|
||||
- @213edu,
|
||||
- @Tanete,
|
||||
- @guodongxiaren,
|
||||
- @zzlyzq,
|
||||
- @FineFan,
|
||||
- @yujianxuechuan,
|
||||
- @Medusar,
|
||||
- @shaohaolin,
|
||||
- @ailurus1991,
|
||||
- @liaoishere,
|
||||
- @CHINAANSHE,
|
||||
- @stduolc,
|
||||
- @yupmoon,
|
||||
- @tomatoKiller,
|
||||
- @zhangboyue,
|
||||
- @kingname,
|
||||
- @KevinSJ,
|
||||
- @zsJacky,
|
||||
- @willqian,
|
||||
- @Hao-Ding,
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||||
- @JygjHappy,
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||||
- @Maclauring,
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||||
- @small-Wood,
|
||||
- @cereuz,
|
||||
- @fbigun,
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||||
- @lijhg,
|
||||
- @soooogreen,
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||||
- ZTinoZ,
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||||
- theo-l,
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||||
- luoxcat,
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||||
- disylee,
|
||||
- wi-cuckoo,
|
||||
- haimingfg,
|
||||
- KayGuoWhu,
|
||||
- wwy-hust,
|
||||
- martin2011qi,
|
||||
- cvsher,
|
||||
- su-kaiyao,
|
||||
- flsf,
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||||
- SPccman,
|
||||
- Stevearzh
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||||
- Linchenguang,
|
||||
- oska874
|
||||
- Linux-pdz,
|
||||
- 2q1w2007,
|
||||
- felixonmars,
|
||||
- wyangsun,
|
||||
- MikeCoder,
|
||||
- mr-ping,
|
||||
- xiqingongzi
|
||||
- H-mudcup,
|
||||
- zhangboyue,
|
||||
- goreliu,
|
||||
- DongShuaike,
|
||||
- TxmszLou,
|
||||
- ZhouJ-sh,
|
||||
- wangjiezhe,
|
||||
- NearTan,
|
||||
- icybreaker,
|
||||
- shipsw,
|
||||
- johnhoow,
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||||
- linuhap,
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||||
- boredivan,
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||||
- blueabysm,
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||||
- liaoishere,
|
||||
- yechunxiao19,
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||||
- l3b2w1,
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||||
- XLCYun,
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||||
- KevinSJ,
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||||
- tenght,
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||||
- coloka,
|
||||
- luoyutiantang,
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||||
- yupmoon,
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||||
- jiajia9linuxer,
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||||
- scusjs,
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||||
- tnuoccalanosrep,
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||||
- woodboow,
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||||
- 1w2b3l,
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- crowner,
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- mtunique,
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||||
- dingdongnigetou,
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||||
- CNprober,
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||||
- JonathanKang,
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||||
- Medusar,
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||||
- hyaocuk,
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||||
- szrlee,
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||||
- Xuanwo,
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||||
- nd0104,
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||||
- xiaoyu33,
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- guodongxiaren,
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||||
- zzlyzq,
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||||
- yujianxuechuan,
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||||
- ailurus1991,
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||||
- ggaaooppeenngg,
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||||
- Ricky-Gong,
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||||
- lfzark,
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||||
- 213edu,
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||||
- Tanete,
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||||
- liuaiping,
|
||||
- jerryling315,
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||||
- tomatoKiller,
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||||
- stduolc,
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||||
- shaohaolin,
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||||
- Timeszoro,
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||||
- rogetfan,
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||||
- FineFan,
|
||||
- kingname,
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||||
- jasminepeng,
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||||
- JeffDing,
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||||
- CHINAANSHE,
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||||
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（按提交行数排名前百）
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LFS 项目活跃成员有：
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||||
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@ -169,7 +173,7 @@ LFS 项目活跃成员有：
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||||
- @KevinSJ
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- @Yuking-net
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（更新于2015/06/09，以Github contributors列表排名）
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（更新于2015/11/29）
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谢谢大家的支持！
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@ -0,0 +1,435 @@
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如何在 Ubuntu 15.04 中安装 puppet
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================================================================================
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大家好，本教程将学习如何在 ubuntu 15.04 上面安装 puppet，它可以用来管理你的服务器基础环境。puppet 是由puppet 实验室（Puppet Labs）开发并维护的一款开源的配置管理软件，它能够帮我们自动化供给、配置和管理服务器的基础环境。不管我们管理的是几个服务器还是数以千计的计算机组成的业务报表体系，puppet 都能够使管理员从繁琐的手动配置调整中解放出来，腾出时间和精力去提系统的升整体效率。它能够确保所有自动化流程作业的一致性、可靠性以及稳定性。它让管理员和开发者更紧密的联系在一起，使开发者更容易产出付出设计良好、简洁清晰的代码。puppet 提供了配置管理和数据中心自动化的两个解决方案。这两个解决方案分别是 **puppet 开源版** 和 **puppet 企业版**。puppet 开源版以 Apache 2.0 许可证发布，它是一个非常灵活、可定制的解决方案，设置初衷是帮助管理员去完成那些重复性操作工作。pupprt 企业版是一个全平台复杂 IT 环境下的成熟解决方案，它除了拥有开源版本所有优势以外还有移动端 apps、只有商业版才有的加强支持，以及模块化和集成管理等。Puppet 使用 SSL 证书来认证主控服务器与代理节点之间的通信。
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本教程将要介绍如何在运行 ubuntu 15.04 的主控服务器和代理节点上面安装开源版的 puppet。在这里，我们用一台服务器做主控服务器（master），管理和控制剩余的当作 puppet 代理节点（agent node）的服务器，这些代理节点将依据主控服务器来进行配置。在 ubuntu 15.04 只需要简单的几步就能安装配置好 puppet，用它来管理我们的服务器基础环境非常的方便。（LCTT 译注：puppet 采用 C/S 架构，所以必须有至少有一台作为服务器，其他作为客户端处理）
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### 1.设置主机文件 ###
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在本教程里，我们将使用2台运行 ubuntu 15.04 “Vivid Vervet" 的主机，一台作为主控服务器，另一台作为 puppet 的代理节点。下面是我们将用到的服务器的基础信息。
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- puupet 主控服务器 IP：44.55.88.6 ，主机名： puppetmaster
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- puppet 代理节点 IP： 45.55.86.39 ，主机名： puppetnode
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我们要在代理节点和服务器这两台机器的 hosts 文件里面都添加上相应的条目，使用 root 或是 sudo 访问权限来编辑 /etc/hosts 文件，命令如下：
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# nano /etc/hosts
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45.55.88.6 puppetmaster.example.com puppetmaster
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45.55.86.39 puppetnode.example.com puppetnode
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注意，puppet 主控服务器必使用 8140 端口来运行，所以请务必保证开启8140端口。
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### 2. 用 NTP 更新时间 ###
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puppet 代理节点所使用系统时间必须要准确，这样可以避免代理证书出现问题。如果有时间差异，那么证书将过期失效，所以服务器与代理节点的系统时间必须互相同步。我们使用 NTP（Network Time Protocol，网络时间协议）来同步时间。**在服务器与代理节点上面分别**运行以下命令来同步时间。
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# ntpdate pool.ntp.org
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17 Jun 00:17:08 ntpdate[882]: adjust time server 66.175.209.17 offset -0.001938 sec
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（LCTT 译注：显示类似的输出结果表示运行正常）
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如果没有安装 ntp，请使用下面的命令更新你的软件仓库，安装并运行ntp服务
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# apt-get update && sudo apt-get -y install ntp ; service ntp restart
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### 3. 安装主控服务器软件 ###
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安装开源版本的 puppet 有很多的方法。在本教程中我们在 puppet 实验室官网下载一个名为 puppetlabs-release 的软件包的软件源，安装后它将为我们在软件源里面添加 puppetmaster-passenger。puppetmaster-passenger 包括带有 apache 的 puppet 主控服务器。我们开始下载这个软件包：
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# cd /tmp/
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# wget https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
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--2015-06-17 00:19:26-- https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
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Resolving apt.puppetlabs.com (apt.puppetlabs.com)... 192.155.89.90, 2600:3c03::f03c:91ff:fedb:6b1d
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Connecting to apt.puppetlabs.com (apt.puppetlabs.com)|192.155.89.90|:443... connected.
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HTTP request sent, awaiting response... 200 OK
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Length: 7384 (7.2K) [application/x-debian-package]
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Saving to: ‘puppetlabs-release-trusty.deb’
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puppetlabs-release-tr 100%[===========================>] 7.21K --.-KB/s in 0.06s
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2015-06-17 00:19:26 (130 KB/s) - ‘puppetlabs-release-trusty.deb’ saved [7384/7384]
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下载完成，我们来安装它：
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# dpkg -i puppetlabs-release-trusty.deb
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Selecting previously unselected package puppetlabs-release.
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(Reading database ... 85899 files and directories currently installed.)
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Preparing to unpack puppetlabs-release-trusty.deb ...
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Unpacking puppetlabs-release (1.0-11) ...
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Setting up puppetlabs-release (1.0-11) ...
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使用 apt 包管理命令更新一下本地的软件源：
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# apt-get update
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现在我们就可以安装 puppetmaster-passenger 了
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# apt-get install puppetmaster-passenger
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**提示**: 在安装的时候可能会报错：
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Warning: Setting templatedir is deprecated.see http://links.puppetlabs.com/env-settings-deprecations (at /usr/lib/ruby/vendor_ruby/puppet/settings.rb:1139:in `issue_deprecation_warning')
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不过不用担心，忽略掉它就好，我们只需要在设置配置文件的时候把这一项禁用就行了。
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如何来查看puppet 主控服务器是否已经安装成功了呢？非常简单，只需要使用下面的命令查看它的版本就可以了。
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# puppet --version
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3.8.1
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现在我们已经安装好了 puppet 主控服务器。因为我们使用的是配合 apache 的 passenger，由 apache 来控制 puppet 主控服务器，当 apache 运行时 puppet 主控才运行。
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在开始之前，我们需要通过停止 apache 服务来让 puppet 主控服务器停止运行。
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# systemctl stop apache2
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### 4. 使用 Apt 工具锁定主控服务器的版本 ###
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||||
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现在已经安装了 3.8.1 版的 puppet，我们锁定这个版本不让它随意升级，因为升级会造成配置文件混乱。 使用 apt 工具来锁定它，这里我们需要使用文本编辑器来创建一个新的文件 **/etc/apt/preferences.d/00-puppet.pref**
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# nano /etc/apt/preferences.d/00-puppet.pref
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||||
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||||
在新创建的文件里面添加以下内容：
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||||
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||||
# /etc/apt/preferences.d/00-puppet.pref
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Package: puppet puppet-common puppetmaster-passenger
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Pin: version 3.8*
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Pin-Priority: 501
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||||
这样在以后的系统软件升级中， puppet 主控服务器将不会跟随系统软件一起升级。
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||||
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### 5. 配置 Puppet 主控服务器###
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||||
Puppet 主控服务器作为一个证书发行机构，需要生成它自己的证书，用于签署所有代理的证书的请求。首先我们要删除所有在该软件包安装过程中创建出来的 ssl 证书。本地默认的 puppet 证书放在 /var/lib/puppet/ssl。因此我们只需要使用 rm 命令来整个移除这些证书就可以了。
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||||
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||||
# rm -rf /var/lib/puppet/ssl
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||||
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||||
现在来配置该证书，在创建 puppet 主控服务器证书时，我们需要包括代理节点与主控服务器沟通所用的每个 DNS 名称。使用文本编辑器来修改服务器的配置文件 puppet.conf
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||||
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||||
# nano /etc/puppet/puppet.conf
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||||
|
||||
输出的结果像下面这样
|
||||
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||||
[main]
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||||
logdir=/var/log/puppet
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||||
vardir=/var/lib/puppet
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||||
ssldir=/var/lib/puppet/ssl
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||||
rundir=/var/run/puppet
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||||
factpath=$vardir/lib/facter
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||||
templatedir=$confdir/templates
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||||
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||||
[master]
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||||
# These are needed when the puppetmaster is run by passenger
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||||
# and can safely be removed if webrick is used.
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||||
ssl_client_header = SSL_CLIENT_S_DN
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||||
ssl_client_verify_header = SSL_CLIENT_VERIFY
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||||
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||||
在这我们需要注释掉 templatedir 这行使它失效。然后在文件的 `[main]` 小节的结尾添加下面的信息。
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||||
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||||
server = puppetmaster
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||||
environment = production
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||||
runinterval = 1h
|
||||
strict_variables = true
|
||||
certname = puppetmaster
|
||||
dns_alt_names = puppetmaster, puppetmaster.example.com
|
||||
|
||||
还有很多你可能用的到的配置选项。 如果你有需要，在 Puppet 实验室有一份详细的描述文件供你阅读： [Main Config File (puppet.conf)][1]。
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||||
|
||||
编辑完成后保存退出。
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||||
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||||
使用下面的命令来生成一个新的证书。
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||||
|
||||
# puppet master --verbose --no-daemonize
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||||
|
||||
Info: Creating a new SSL key for ca
|
||||
Info: Creating a new SSL certificate request for ca
|
||||
Info: Certificate Request fingerprint (SHA256): F6:2F:69:89:BA:A5:5E:FF:7F:94:15:6B:A7:C4:20:CE:23:C7:E3:C9:63:53:E0:F2:76:D7:2E:E0:BF:BD:A6:78
|
||||
...
|
||||
Notice: puppetmaster has a waiting certificate request
|
||||
Notice: Signed certificate request for puppetmaster
|
||||
Notice: Removing file Puppet::SSL::CertificateRequest puppetmaster at '/var/lib/puppet/ssl/ca/requests/puppetmaster.pem'
|
||||
Notice: Removing file Puppet::SSL::CertificateRequest puppetmaster at '/var/lib/puppet/ssl/certificate_requests/puppetmaster.pem'
|
||||
Notice: Starting Puppet master version 3.8.1
|
||||
^CNotice: Caught INT; storing stop
|
||||
Notice: Processing stop
|
||||
|
||||
至此，证书已经生成。一旦我们看到 **Notice: Starting Puppet master version 3.8.1**，就表明证书就已经制作好了。我们按下 CTRL-C 回到 shell 命令行。
|
||||
|
||||
查看新生成证书的信息，可以使用下面的命令。
|
||||
|
||||
# puppet cert list -all
|
||||
|
||||
+ "puppetmaster" (SHA256) 33:28:97:86:A1:C3:2F:73:10:D1:FB:42:DA:D5:42:69:71:84:F0:E2:8A:01:B9:58:38:90:E4:7D:B7:25:23:EC (alt names: "DNS:puppetmaster", "DNS:puppetmaster.example.com")
|
||||
|
||||
### 6. 创建一个 Puppet 清单 ###
|
||||
|
||||
默认的主要清单（Manifest）是 /etc/puppet/manifests/site.pp。 这个主要清单文件包括了用于在代理节点执行的配置定义。现在我们来创建一个清单文件：
|
||||
|
||||
# nano /etc/puppet/manifests/site.pp
|
||||
|
||||
在刚打开的文件里面添加下面这几行：
|
||||
|
||||
# execute 'apt-get update'
|
||||
exec { 'apt-update': # exec resource named 'apt-update'
|
||||
command => '/usr/bin/apt-get update' # command this resource will run
|
||||
}
|
||||
|
||||
# install apache2 package
|
||||
package { 'apache2':
|
||||
require => Exec['apt-update'], # require 'apt-update' before installing
|
||||
ensure => installed,
|
||||
}
|
||||
|
||||
# ensure apache2 service is running
|
||||
service { 'apache2':
|
||||
ensure => running,
|
||||
}
|
||||
|
||||
以上这几行的意思是给代理节点部署 apache web 服务。
|
||||
|
||||
### 7. 运行 puppet 主控服务 ###
|
||||
|
||||
已经准备好运行 puppet 主控服务器 了，那么开启 apache 服务来让它启动
|
||||
|
||||
# systemctl start apache2
|
||||
|
||||
我们 puppet 主控服务器已经运行，不过它还不能管理任何代理节点。现在我们给 puppet 主控服务器添加代理节点.
|
||||
|
||||
**提示**: 如果报错
|
||||
|
||||
Job for apache2.service failed. see "systemctl status apache2.service" and "journalctl -xe" for details.
|
||||
|
||||
肯定是 apache 服务器有一些问题，我们可以使用 root 或是 sudo 访问权限来运行**apachectl start**查看它输出的日志。在本教程执行过程中, 我们发现一个 **/etc/apache2/sites-enabled/puppetmaster.conf** 的证书配置问题。修改其中的**SSLCertificateFile /var/lib/puppet/ssl/certs/server.pem **为 **SSLCertificateFile /var/lib/puppet/ssl/certs/puppetmaster.pem**，然后注释掉后面这行**SSLCertificateKeyFile** 。然后在命令行重新启动 apache。
|
||||
|
||||
### 8. 安装 Puppet 代理节点的软件包 ###
|
||||
|
||||
我们已经准备好了 puppet 的服务器，现在需要一个可以管理的代理节点，我们将安装 puppet 代理软件到节点上去。这里我们要给每一个需要管理的节点安装代理软件，并且确保这些节点能够通过 DNS 查询到服务器主机。下面将 安装最新的代理软件到 节点 puppetnode.example.com 上。
|
||||
|
||||
在代理节点上使用下面的命令下载 puppet 实验室提供的软件包：
|
||||
|
||||
# cd /tmp/
|
||||
# wget https://apt.puppetlabs.com/puppetlabs-release-trusty.deb\
|
||||
|
||||
--2015-06-17 00:54:42-- https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
|
||||
Resolving apt.puppetlabs.com (apt.puppetlabs.com)... 192.155.89.90, 2600:3c03::f03c:91ff:fedb:6b1d
|
||||
Connecting to apt.puppetlabs.com (apt.puppetlabs.com)|192.155.89.90|:443... connected.
|
||||
HTTP request sent, awaiting response... 200 OK
|
||||
Length: 7384 (7.2K) [application/x-debian-package]
|
||||
Saving to: ‘puppetlabs-release-trusty.deb’
|
||||
|
||||
puppetlabs-release-tr 100%[===========================>] 7.21K --.-KB/s in 0.04s
|
||||
|
||||
2015-06-17 00:54:42 (162 KB/s) - ‘puppetlabs-release-trusty.deb’ saved [7384/7384]
|
||||
|
||||
在 ubuntu 15.04 上我们使用debian包管理系统来安装它，命令如下：
|
||||
|
||||
# dpkg -i puppetlabs-release-trusty.deb
|
||||
|
||||
使用 apt 包管理命令更新一下本地的软件源：
|
||||
|
||||
# apt-get update
|
||||
|
||||
通过远程仓库安装：
|
||||
|
||||
# apt-get install puppet
|
||||
|
||||
Puppet 代理默认是不启动的。这里我们需要使用文本编辑器修改 /etc/default/puppet 文件，使它正常工作：
|
||||
|
||||
# nano /etc/default/puppet
|
||||
|
||||
更改 **START** 的值改成 "yes" 。
|
||||
|
||||
START=yes
|
||||
|
||||
最后保存并退出。
|
||||
|
||||
### 9. 使用 Apt 工具锁定代理软件的版本 ###
|
||||
|
||||
和上面的步骤一样为防止随意升级造成的配置文件混乱，我们要使用 apt 工具来把它锁定。具体做法是使用文本编辑器创建一个文件 **/etc/apt/preferences.d/00-puppet.pref**
|
||||
|
||||
# nano /etc/apt/preferences.d/00-puppet.pref
|
||||
|
||||
在新建的文件里面加入如下内容
|
||||
|
||||
# /etc/apt/preferences.d/00-puppet.pref
|
||||
Package: puppet puppet-common
|
||||
Pin: version 3.8*
|
||||
Pin-Priority: 501
|
||||
|
||||
这样 puppet 就不会随着系统软件升级而随意升级了。
|
||||
|
||||
### 10. 配置 puppet 代理节点 ###
|
||||
|
||||
我们需要编辑一下代理节点的 puppet.conf 文件，来使它运行。
|
||||
|
||||
# nano /etc/puppet/puppet.conf
|
||||
|
||||
它看起来和服务器的配置文件完全一样。同样注释掉**templatedir**这行。不同的是在这里我们需要删除掉所有关于`[master]` 的部分。
|
||||
|
||||
假定主控服务器可以通过名字“puppet-master”访问，我们的客户端应该可以和它相互连接通信。如果不行的话，我们需要使用完整的主机域名 puppetmaster.example.com
|
||||
|
||||
[agent]
|
||||
server = puppetmaster.example.com
|
||||
certname = puppetnode.example.com
|
||||
|
||||
在文件的结尾增加上面3行，增加之后文件内容像下面这样：
|
||||
|
||||
[main]
|
||||
logdir=/var/log/puppet
|
||||
vardir=/var/lib/puppet
|
||||
ssldir=/var/lib/puppet/ssl
|
||||
rundir=/var/run/puppet
|
||||
factpath=$vardir/lib/facter
|
||||
#templatedir=$confdir/templates
|
||||
|
||||
[agent]
|
||||
server = puppetmaster.example.com
|
||||
certname = puppetnode.example.com
|
||||
|
||||
最后保存并退出。
|
||||
|
||||
使用下面的命令来启动客户端软件：
|
||||
|
||||
# systemctl start puppet
|
||||
|
||||
如果一切顺利的话，我们不会看到命令行有任何输出。 第一次运行的时候，代理节点会生成一个 ssl 证书并且给服务器发送一个请求，经过签名确认后，两台机器就可以互相通信了。
|
||||
|
||||
**提示**： 如果这是你添加的第一个代理节点，建议你在添加其他节点前先给这个证书签名。一旦能够通过并正常运行，回过头来再添加其他代理节点。
|
||||
|
||||
### 11. 在主控服务器上对证书请求进行签名 ###
|
||||
|
||||
第一次运行的时候，代理节点会生成一个 ssl 证书并且给服务器发送一个签名请求。在主控服务器给代理节点服务器证书签名之后，主服务器才能和代理服务器通信并且控制代理服务器。
|
||||
|
||||
在主控服务器上使用下面的命令来列出当前的证书请求：
|
||||
|
||||
# puppet cert list
|
||||
"puppetnode.example.com" (SHA256) 31:A1:7E:23:6B:CD:7B:7D:83:98:33:8B:21:01:A6:C4:01:D5:53:3D:A0:0E:77:9A:77:AE:8F:05:4A:9A:50:B2
|
||||
|
||||
因为只设置了一台代理节点服务器，所以我们将只看到一个请求。看起来类似如上，代理节点的完整域名即其主机名。
|
||||
|
||||
注意有没有“+”号在前面，代表这个证书有没有被签名。
|
||||
|
||||
使用带有主机名的**puppet cert sign**这个命令来签署这个签名请求，如下：
|
||||
|
||||
# puppet cert sign puppetnode.example.com
|
||||
Notice: Signed certificate request for puppetnode.example.com
|
||||
Notice: Removing file Puppet::SSL::CertificateRequest puppetnode.example.com at '/var/lib/puppet/ssl/ca/requests/puppetnode.example.com.pem'
|
||||
|
||||
主控服务器现在可以通讯和控制它签名过的代理节点了。
|
||||
|
||||
如果想签署所有的当前请求，可以使用 -all 选项，如下所示：
|
||||
|
||||
# puppet cert sign --all
|
||||
|
||||
### 12. 删除一个 Puppet 证书 ###
|
||||
|
||||
如果我们想移除一个主机，或者想重建一个主机然后再添加它。下面的例子里我们将展示如何删除 puppet 主控服务器上面的一个证书。使用的命令如下：
|
||||
|
||||
# puppet cert clean hostname
|
||||
Notice: Revoked certificate with serial 5
|
||||
Notice: Removing file Puppet::SSL::Certificate puppetnode.example.com at '/var/lib/puppet/ssl/ca/signed/puppetnode.example.com.pem'
|
||||
Notice: Removing file Puppet::SSL::Certificate puppetnode.example.com at '/var/lib/puppet/ssl/certs/puppetnode.example.com.pem'
|
||||
|
||||
如果我们想查看所有的签署和未签署的请求，使用下面这条命令：
|
||||
|
||||
# puppet cert list --all
|
||||
+ "puppetmaster" (SHA256) 33:28:97:86:A1:C3:2F:73:10:D1:FB:42:DA:D5:42:69:71:84:F0:E2:8A:01:B9:58:38:90:E4:7D:B7:25:23:EC (alt names: "DNS:puppetmaster", "DNS:puppetmaster.example.com")
|
||||
|
||||
|
||||
### 13. 部署 Puppet 清单 ###
|
||||
|
||||
当配置并完成 puppet 清单后，现在我们需要部署清单到代理节点服务器上。要应用并加载主 puppet 清单，我们可以在代理节点服务器上面使用下面的命令：
|
||||
|
||||
# puppet agent --test
|
||||
|
||||
Info: Retrieving pluginfacts
|
||||
Info: Retrieving plugin
|
||||
Info: Caching catalog for puppetnode.example.com
|
||||
Info: Applying configuration version '1434563858'
|
||||
Notice: /Stage[main]/Main/Exec[apt-update]/returns: executed successfully
|
||||
Notice: Finished catalog run in 10.53 seconds
|
||||
|
||||
这里向我们展示了主清单如何立即影响到了一个单一的服务器。
|
||||
|
||||
如果我们打算运行的 puppet 清单与主清单没有什么关联，我们可以简单使用 puppet apply 带上相应的清单文件的路径即可。它仅将清单应用到我们运行该清单的代理节点上。
|
||||
|
||||
# puppet apply /etc/puppet/manifest/test.pp
|
||||
|
||||
### 14. 为特定节点配置清单 ###
|
||||
|
||||
如果我们想部署一个清单到某个特定的节点，我们需要如下配置清单。
|
||||
|
||||
在主控服务器上面使用文本编辑器编辑 /etc/puppet/manifest/site.pp：
|
||||
|
||||
# nano /etc/puppet/manifest/site.pp
|
||||
|
||||
添加下面的内容进去
|
||||
|
||||
node 'puppetnode', 'puppetnode1' {
|
||||
# execute 'apt-get update'
|
||||
exec { 'apt-update': # exec resource named 'apt-update'
|
||||
command => '/usr/bin/apt-get update' # command this resource will run
|
||||
}
|
||||
|
||||
# install apache2 package
|
||||
package { 'apache2':
|
||||
require => Exec['apt-update'], # require 'apt-update' before installing
|
||||
ensure => installed,
|
||||
}
|
||||
|
||||
# ensure apache2 service is running
|
||||
service { 'apache2':
|
||||
ensure => running,
|
||||
}
|
||||
}
|
||||
|
||||
这里的配置显示我们将在名为 puppetnode 和 puppetnode1 的2个指定的节点上面安装 apache 服务。这里可以添加其他我们需要安装部署的具体节点进去。
|
||||
|
||||
### 15. 配置清单模块 ###
|
||||
|
||||
模块对于组合任务是非常有用的，在 Puppet 社区有很多人贡献了自己的模块组件。
|
||||
|
||||
在主控服务器上, 我们将使用 puppet module 命令来安装 **puppetlabs-apache** 模块。
|
||||
|
||||
# puppet module install puppetlabs-apache
|
||||
|
||||
**警告**: 千万不要在一个已经部署 apache 环境的机器上面使用这个模块，否则它将清空你没有被 puppet 管理的 apache 配置。
|
||||
|
||||
现在用文本编辑器来修改 **site.pp** ：
|
||||
|
||||
# nano /etc/puppet/manifest/site.pp
|
||||
|
||||
添加下面的内容进去，在 puppetnode 上面安装 apache 服务。
|
||||
|
||||
node 'puppet-node' {
|
||||
class { 'apache': } # use apache module
|
||||
apache::vhost { 'example.com': # define vhost resource
|
||||
port => '80',
|
||||
docroot => '/var/www/html'
|
||||
}
|
||||
}
|
||||
|
||||
保存退出。然后重新运行该清单来为我们的代理节点部署 apache 配置。
|
||||
|
||||
### 总结 ###
|
||||
|
||||
现在我们已经成功的在 ubuntu 15.04 上面部署并运行 puppet 来管理代理节点服务器的基础运行环境。我们学习了puppet 是如何工作的，编写清单文件，节点与主机间使用 ssl 证书认证的认证过程。使用 puppet 开源软件配置管理工具在众多的代理节点上来控制、管理和配置重复性任务是非常容易的。如果你有任何的问题，建议，反馈，与我们取得联系，我们将第一时间完善更新，谢谢。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://linoxide.com/linux-how-to/install-puppet-ubuntu-15-04/
|
||||
|
||||
作者：[Arun Pyasi][a]
|
||||
译者：[ivo-wang](https://github.com/ivo-wang)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/arunp/
|
||||
[1]:https://docs.puppetlabs.com/puppet/latest/reference/config_file_main.html
|
||||
@ -0,0 +1,101 @@
|
||||
UNIX 家族小史
|
||||
================================================================================
|
||||
|
||||
|
||||
要记住，当一扇门在你面前关闭的时候，另一扇门就会打开。肯·汤普森（[Ken Thompson][1]） 和丹尼斯·里奇（[Dennis Richie][2]） 两个人就是这句名言很好的实例。他们俩是**20世纪**最优秀的信息技术专家之二，因为他们创造了最具影响力和创新性的软件之一： **UNIX**。
|
||||
|
||||
### UNIX 系统诞生于贝尔实验室 ###
|
||||
|
||||
**UNIX** 最开始的名字是 **UNICS** (**UN**iplexed **I**nformation and **C**omputing **S**ervice)，它有一个大家庭，并不是从石头缝里蹦出来的。UNIX的祖父是 **CTSS** (**C**ompatible **T**ime **S**haring **S**ystem)，它的父亲是 **Multics** (**MULT**iplexed **I**nformation and **C**omputing **S**ervice)，这个系统能支持大量用户通过交互式分时（timesharing）的方式使用大型机。
|
||||
|
||||
UNIX 诞生于 **1969** 年，由**肯·汤普森**以及后来加入的**丹尼斯·里奇**共同完成。这两位优秀的研究员和科学家在一个**通用电器 GE**和**麻省理工学院**的合作项目里工作，项目目标是开发一个叫 Multics 的交互式分时系统。
|
||||
|
||||
Multics 的目标是整合分时技术以及当时其他先进技术，允许用户在远程终端通过电话（拨号）登录到主机，然后可以编辑文档，阅读电子邮件，运行计算器，等等。
|
||||
|
||||
在之后的五年里，AT&T 公司为 Multics 项目投入了数百万美元。他们购买了 GE-645 大型机，聚集了贝尔实验室的顶级研究人员，例如肯·汤普森、 Stuart Feldman、丹尼斯·里奇、道格拉斯·麦克罗伊（M. Douglas McIlroy）、 Joseph F. Ossanna 以及 Robert Morris。但是项目目标太过激进，进度严重滞后。最后，AT&T 高层决定放弃这个项目。
|
||||
|
||||
贝尔实验室的管理层决定停止这个让许多研究人员无比纠结的操作系统上的所有遗留工作。不过要感谢汤普森，里奇和一些其他研究员，他们把老板的命令丢到一边，并继续在实验室里满怀热心地忘我工作，最终孵化出前无古人后无来者的 UNIX。
|
||||
|
||||
UNIX 的第一声啼哭是在一台 PDP-7 微型机上，它是汤普森测试自己在操作系统设计上的点子的机器，也是汤普森和 里奇一起玩 Space and Travel 游戏的模拟器。
|
||||
|
||||
> “我们想要的不仅是一个优秀的编程环境，而是能围绕这个系统形成团体。按我们自己的经验，通过远程访问和分时主机实现的公共计算，本质上不只是用终端输入程序代替打孔机而已，而是鼓励密切沟通。”丹尼斯·里奇说。
|
||||
|
||||
UNIX 是第一个靠近理想的系统，在这里程序员可以坐在机器前自由摆弄程序，探索各种可能性并随手测试。在 UNIX 整个生命周期里，它吸引了大量因其他操作系统限制而投身过来的高手做出无私贡献，因此它的功能模型一直保持上升趋势。
|
||||
|
||||
UNIX 在 1970 年因为 PDP-11/20 获得了首次资金注入，之后正式更名为 UNIX 并支持在 PDP-11/20 上运行。UNIX 带来的第一次用于实际场景中是在 1971 年，贝尔实验室的专利部门配备来做文字处理。
|
||||
|
||||
### UNIX 上的 C 语言革命 ###
|
||||
|
||||
丹尼斯·里奇在 1972 年发明了一种叫 “**C**” 的高级编程语言 ，之后他和肯·汤普森决定用 “C” 重写 UNIX 系统，来支持更好的移植性。他们在那一年里编写和调试了差不多 100,000 行代码。在迁移到 “C” 语言后，系统可移植性非常好，只需要修改一小部分机器相关的代码就可以将 UNIX 移植到其他计算机平台上。
|
||||
|
||||
UNIX 第一次公开露面是 1973 年丹尼斯·里奇和肯·汤普森在操作系统原理（Operating Systems Principles）上发表的一篇论文，然后 AT&T 发布了 UNIX 系统第 5 版，并授权给教育机构使用，之后在 1975 年第一次以 **$20.000** 的价格授权企业使用 UNIX 第 6 版。应用最广泛的是 1980 年发布的 UNIX 第 7 版，任何人都可以购买授权，只是授权条款非常严格。授权内容包括源代码，以及用 PDP-11 汇编语言写的及其相关内核。反正，各种版本 UNIX 系统完全由它的用户手册确定。
|
||||
|
||||
### AIX 系统 ###
|
||||
|
||||
在 **1983** 年，**微软**计划开发 **Xenix** 作为 MS-DOS 的多用户版继任者，他们在那一年花了 $8,000 搭建了一台拥有 **512 KB** 内存以及 **10 MB**硬盘并运行 Xenix 的 Altos 586。而到 1984 年为止，全世界 UNIX System V 第二版的安装数量已经超过了 100,000 。在 1986 年发布了包含因特网域名服务的 4.3BSD，而且 **IBM** 宣布 **AIX 系统**的安装数已经超过 250,000。AIX 基于 Unix System V 开发，这套系统拥有 BSD 风格的根文件系统，是两者的结合。
|
||||
|
||||
AIX 第一次引入了 **日志文件系统 (JFS)** 以及集成逻辑卷管理器 (Logical Volume Manager ，LVM)。IBM 在 1989 年将 AIX 移植到自己的 RS/6000 平台。2001 年发布的 5L 版是一个突破性的版本，提供了 Linux 友好性以及支持 Power4 服务器的逻辑分区。
|
||||
|
||||
在 2004 年发布的 AIX 5.3 引入了支持高级电源虚拟化（ Advanced Power Virtualization，APV）的虚拟化技术，支持对称多线程、微分区，以及共享处理器池。
|
||||
|
||||
在 2007 年，IBM 同时发布 AIX 6.1 和 Power6 架构，开始加强自己的虚拟化产品。他们还将高级电源虚拟化重新包装成 PowerVM。
|
||||
|
||||
这次改进包括被称为 WPARs 的负载分区形式，类似于 Solaris 的 zones/Containers，但是功能更强。
|
||||
|
||||
### HP-UX 系统 ###
|
||||
|
||||
**惠普 UNIX (Hewlett-Packard’s UNIX，HP-UX)** 源于 System V 第 3 版。这套系统一开始只支持 PA-RISC HP 9000 平台。HP-UX 第 1 版发布于 1984 年。
|
||||
|
||||
HP-UX 第 9 版引入了 SAM，一个基于字符的图形用户界面 (GUI)，用户可以用来管理整个系统。在 1995 年发布的第 10 版，调整了系统文件分布以及目录结构，变得有点类似 AT&T SVR4。
|
||||
|
||||
第 11 版发布于 1997 年。这是 HP 第一个支持 64 位寻址的版本。不过在 2000 年重新发布成 11i，因为 HP 为特定的信息技术用途，引入了操作环境（operating environments）和分级应用（layered applications）的捆绑组（bundled groups）。
|
||||
|
||||
在 2001 年发布的 11.20 版宣称支持安腾（Itanium）系统。HP-UX 是第一个使用 ACLs（访问控制列表，Access Control Lists）管理文件权限的 UNIX 系统，也是首先支持内建逻辑卷管理器（Logical Volume Manager）的系统之一。
|
||||
|
||||
如今，HP-UX 因为 HP 和 Veritas 的合作关系使用了 Veritas 作为主文件系统。
|
||||
|
||||
HP-UX 目前的最新版本是 11iv3, update 4。
|
||||
|
||||
### Solaris 系统 ###
|
||||
|
||||
Sun 的 UNIX 版本是 **Solaris**，用来接替 1992 年创建的 **SunOS**。SunOS 一开始基于 BSD（伯克利软件发行版，Berkeley Software Distribution）风格的 UNIX，但是 SunOS 5.0 版以及之后的版本都是基于重新包装为 Solaris 的 Unix System V 第 4 版。
|
||||
|
||||
SunOS 1.0 版于 1983 年发布，用于支持 Sun-1 和 Sun-2 平台。随后在 1985 年发布了 2.0 版。在 1987 年，Sun 和 AT&T 宣布合作一个项目以 SVR4 为基础将 System V 和 BSD 合并成一个版本。
|
||||
|
||||
Solaris 2.4 是 Sun 发布的第一个 Sparc/x86 版本。1994 年 11 月份发布的 SunOS 4.1.4 版是最后一个版本。Solaris 7 是首个 64 位 Ultra Sparc 版本，加入了对文件系统元数据记录的原生支持。
|
||||
|
||||
Solaris 9 发布于 2002 年，支持 Linux 特性以及 Solaris 卷管理器（Solaris Volume Manager）。之后，2005 年发布了 Solaris 10，带来许多创新，比如支持 Solaris Containers，新的 ZFS 文件系统，以及逻辑域（Logical Domains）。
|
||||
|
||||
目前 Solaris 最新的版本是 第 10 版，最后的更新发布于 2008 年。
|
||||
|
||||
### Linux ###
|
||||
|
||||
到了 1991 年，用来替代商业操作系统的自由（free）操作系统的需求日渐高涨。因此，**Linus Torvalds** 开始构建一个自由的操作系统，最终成为 **Linux**。Linux 最开始只有一些 “C” 文件，并且使用了阻止商业发行的授权。Linux 是一个类 UNIX 系统但又不尽相同。
|
||||
|
||||
2015 年发布了基于 GNU Public License （GPL）授权的 3.18 版。IBM 声称有超过 1800 万行开源代码开源给开发者。
|
||||
|
||||
如今 GNU Public License 是应用最广泛的自由软件授权方式。根据开源软件原则，这份授权允许个人和企业自由分发、运行、通过拷贝共享、学习，以及修改软件源码。
|
||||
|
||||
### UNIX vs. Linux：技术概要 ###
|
||||
|
||||
- Linux 鼓励多样性，Linux 的开发人员来自各种背景，有更多不同经验和意见。
|
||||
- Linux 比 UNIX 支持更多的平台和架构。
|
||||
- UNIX 商业版本的开发人员针对特定目标平台以及用户设计他们的操作系统。
|
||||
- **Linux 比 UNIX 有更好的安全性**，更少受病毒或恶意软件攻击。截止到现在，Linux 上大约有 60-100 种病毒，但是没有任何一种还在传播。另一方面，UNIX 上大约有 85-120 种病毒，但是其中有一些还在传播中。
|
||||
- 由于 UNIX 命令、工具和元素很少改变，甚至很多接口和命令行参数在后续 UNIX 版本中一直沿用。
|
||||
- 有些 Linux 开发项目以自愿为基础进行资助，比如 Debian。其他项目会维护一个和商业 Linux 的社区版，比如 SUSE 的 openSUSE 以及红帽的 Fedora。
|
||||
- 传统 UNIX 是纵向扩展，而另一方面 Linux 是横向扩展。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.unixmen.com/brief-history-aix-hp-ux-solaris-bsd-linux/
|
||||
|
||||
作者：[M.el Khamlichi][a]
|
||||
译者：[zpl1025](https://github.com/zpl1025)
|
||||
校对：[Caroline](https://github.com/carolinewuyan)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.unixmen.com/author/pirat9/
|
||||
[1]:http://www.unixmen.com/ken-thompson-unix-systems-father/
|
||||
[2]:http://www.unixmen.com/dennis-m-ritchie-father-c-programming-language/
|
||||
@ -0,0 +1,427 @@
|
||||
超神们：15 位健在的世界级程序员！
|
||||
================================================================================
|
||||
|
||||
当开发人员说起世界顶级程序员时，他们的名字往往会被提及。
|
||||
|
||||
好像现在程序员有很多，其中不乏有许多优秀的程序员。但是哪些程序员更好呢？
|
||||
|
||||
虽然这很难客观评价，不过在这个话题确实是开发者们津津乐道的。ITworld 深入程序员社区，避开四溅的争执口水，试图找出可能存在的所谓共识。事实证明，屈指可数的某些名字经常是讨论的焦点。
|
||||
|
||||
|
||||
|
||||
*图片来源： [tom_bullock CC BY 2.0][1]*
|
||||
|
||||
下面就让我们来看看这些世界顶级的程序员吧！
|
||||
|
||||
### 玛格丽特·汉密尔顿（Margaret Hamilton） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [NASA][2]*
|
||||
|
||||
**成就： 阿波罗飞行控制软件背后的大脑**
|
||||
|
||||
生平： 查尔斯·斯塔克·德雷珀实验室（Charles Stark Draper Laboratory）软件工程部的主任，以她为首的团队负责设计和打造 NASA 的阿波罗的舰载飞行控制器软件和空间实验室（Skylab）的任务。基于阿波罗这段的工作经历，她又后续开发了[通用系统语言（Universal Systems Language）][5]和[开发先于事实（ Development Before the Fact）][6]的范例。开创了[异步软件、优先调度和超可靠的软件设计][7]理念。被认为发明了“[软件工程（ software engineering）][8]”一词。1986年获[奥古斯塔·埃达·洛夫莱斯奖（Augusta Ada Lovelace Award）][9]，2003年获 [NASA 杰出太空行动奖（Exceptional Space Act Award）][10]。
|
||||
|
||||
评论：
|
||||
|
||||
> “汉密尔顿发明了测试，使美国计算机工程规范了很多” —— [ford_beeblebrox][11]
|
||||
|
||||
> “我认为在她之前（不敬地说，包括高德纳（Knuth）在内的）计算机编程是（另一种形式上留存的）数学分支。然而这个宇宙飞船的飞行控制系统明确地将编程带入了一个崭新的领域。” —— [Dan Allen][12]
|
||||
|
||||
> “... 她引入了‘软件工程’这个术语 — 并作出了最好的示范。” —— [David Hamilton][13]
|
||||
|
||||
> “真是个坏家伙” [Drukered][14]
|
||||
|
||||
|
||||
### 唐纳德·克努斯（Donald Knuth），即 高德纳 ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [vonguard CC BY-SA 2.0][15]*
|
||||
|
||||
**成就： 《计算机程序设计艺术（The Art of Computer Programming，TAOCP）》 作者**
|
||||
|
||||
生平： 撰写了[编程理论的权威书籍][16]。发明了数字排版系统 Tex。1971年，[ACM（美国计算机协会）葛丽丝·穆雷·霍普奖（Grace Murray Hopper Award）][17] 的首位获奖者。1974年获 ACM [图灵奖（A. M. Turing）][18]，1979年获[美国国家科学奖章（National Medal of Science）][19]，1995年获IEEE[约翰·冯·诺依曼奖章（John von Neumann Medal）][20]。1998年入选[计算机历史博物馆（Computer History Museum）名人录（Hall of Fellows）][21]。
|
||||
|
||||
评论：
|
||||
|
||||
> “... 写的计算机编程艺术（The Art of Computer Programming，TAOCP）可能是有史以来计算机编程方面最大的贡献。”—— [佚名][22]
|
||||
|
||||
> “唐·克努斯的 TeX 是我所用过的计算机程序中唯一一个几乎没有 bug 的。真是让人印象深刻！”—— [Jaap Weel][23]
|
||||
|
||||
> “如果你要问我的话，我只能说太棒了！” —— [Mitch Rees-Jones][24]
|
||||
|
||||
### 肯·汤普逊（Ken Thompson） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Association for Computing Machinery][25]*
|
||||
|
||||
**成就： Unix 之父**
|
||||
|
||||
生平：与[丹尼斯·里奇（Dennis Ritchie）][26]共同创造了 Unix。创造了 [B 语言][27]、[UTF-8 字符编码方案][28]、[ed 文本编辑器][29]，同时也是 Go 语言的共同开发者。（和里奇）共同获得1983年的[图灵奖（A.M. Turing Award ）][30]，1994年获 [IEEE 计算机先驱奖（ IEEE Computer Pioneer Award）][31]，1998年获颁[美国国家科技奖章（ National Medal of Technology ）][32]。在1997年入选[计算机历史博物馆（Computer History Museum）名人录（Hall of Fellows）][33]。
|
||||
|
||||
评论：
|
||||
|
||||
> “... 可能是有史以来最能成事的程序员了。Unix 内核，Unix 工具，国际象棋程序世界冠军 Belle，Plan 9，Go 语言。” —— [Pete Prokopowicz][34]
|
||||
|
||||
> “肯所做出的贡献，据我所知无人能及，是如此的根本、实用、经得住时间的考验，时至今日仍在使用。” —— [Jan Jannink][35]
|
||||
|
||||
|
||||
### 理查德·斯托曼（Richard Stallman） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Jiel Beaumadier CC BY-SA 3.0][135]*
|
||||
|
||||
**成就： Emacs 和 GCC 缔造者**
|
||||
|
||||
生平： 成立了 [GNU 工程（GNU Project）] [36]，并创造了它的许多核心工具，如 [Emacs、GCC、GDB][37] 和 [GNU Make][38]。还创办了[自由软件基金会（Free Software Foundation）] [39]。1990年荣获 ACM 的[葛丽丝·穆雷·霍普奖（ Grace Murray Hopper Award）][40]，1998年获 [EFF 先驱奖（Pioneer Award）][41].
|
||||
|
||||
评论：
|
||||
|
||||
> “... 在 Symbolics 对阵 LMI 的战斗中，独自一人与一众 Lisp 黑客好手对码。” —— [Srinivasan Krishnan][42]
|
||||
|
||||
> “通过他在编程上的精湛造诣与强大信念，开辟了一整套编程与计算机的亚文化。” —— [Dan Dunay][43]
|
||||
|
||||
> “我可以不赞同这位伟人的很多方面，不必盖棺论定，他不可否认都已经是一位伟大的程序员了。” —— [Marko Poutiainen][44]
|
||||
|
||||
> “试想 Linux 如果没有 GNU 工程的前期工作会怎么样。（多亏了）斯托曼的炸弹！” —— [John Burnette][45]
|
||||
|
||||
### 安德斯·海尔斯伯格（Anders Hejlsberg） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [D.Begley CC BY 2.0][46]*
|
||||
|
||||
**成就： 创造了Turbo Pascal**
|
||||
|
||||
生平： [Turbo Pascal 的原作者][47]，是最流行的 Pascal 编译器和第一个集成开发环境。而后，[领导了 Turbo Pascal 的继任者 Delphi][48] 的构建。[C# 的主要设计师和架构师][49]。2001年荣获[ Dr. Dobb 的杰出编程奖（Dr. Dobb's Excellence in Programming Award ）][50]。
|
||||
|
||||
评论：
|
||||
|
||||
> “他用汇编语言为当时两个主流的 PC 操作系统（DOS 和 CPM）编写了 [Pascal] 编译器。用它来编译、链接并运行仅需几秒钟而不是几分钟。” —— [Steve Wood][51]
|
||||
|
||||
> “我佩服他 - 他创造了我最喜欢的开发工具，陪伴着我度过了三个关键的时期直至我成为一位专业的软件工程师。” —— [Stefan Kiryazov][52]
|
||||
|
||||
### Doug Cutting ###
|
||||
|
||||
|
||||
|
||||
图片来源： [vonguard CC BY-SA 2.0][53]
|
||||
|
||||
**成就： 创造了 Lucene**
|
||||
|
||||
生平： [开发了 Lucene 搜索引擎以及 Web 爬虫 Nutch][54] 和用于大型数据集的分布式处理套件 [Hadoop][55]。一位强有力的开源支持者（Lucene、Nutch 以及 Hadoop 都是开源的）。前 [Apache 软件基金（Apache Software Foundation）的理事][56]。
|
||||
|
||||
评论：
|
||||
|
||||
|
||||
> “...他就是那个既写出了优秀搜索框架（lucene/solr），又为世界开启大数据之门（hadoop）的男人。” —— [Rajesh Rao][57]
|
||||
|
||||
> “他在 Lucene 和 Hadoop（及其它工程）的创造/工作中为世界创造了巨大的财富和就业...” —— [Amit Nithianandan][58]
|
||||
|
||||
### Sanjay Ghemawat ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Association for Computing Machinery][59]*
|
||||
|
||||
**成就： 谷歌核心架构师**
|
||||
|
||||
生平： [协助设计和实现了一些谷歌大型分布式系统的功能][60]，包括 MapReduce、BigTable、Spanner 和谷歌文件系统（Google File System）。[创造了 Unix 的 ical ][61]日历系统。2009年入选[美国国家工程院（National Academy of Engineering）][62]。2012年荣获 [ACM-Infosys 基金计算机科学奖（ ACM-Infosys Foundation Award in the Computing Sciences）][63]。
|
||||
|
||||
评论：
|
||||
|
||||
|
||||
> “Jeff Dean的僚机。” —— [Ahmet Alp Balkan][64]
|
||||
|
||||
### Jeff Dean ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Google][65]*
|
||||
|
||||
**成就： 谷歌搜索索引背后的大脑**
|
||||
|
||||
生平：协助设计和实现了[许多谷歌大型分布式系统的功能][66]，包括网页爬虫，索引搜索，AdSense，MapReduce，BigTable 和 Spanner。2009年入选[美国国家工程院（ National Academy of Engineering）][67]。2012年荣获ACM 的[SIGOPS 马克·维瑟奖（ SIGOPS Mark Weiser Award）][68]及[ACM-Infosys基金计算机科学奖（ ACM-Infosys Foundation Award in the Computing Sciences）][69]。
|
||||
|
||||
评论：
|
||||
|
||||
> “... 带来了在数据挖掘（GFS、MapReduce、BigTable）上的突破。” —— [Natu Lauchande][70]
|
||||
|
||||
> “... 设计、构建并部署 MapReduce 和 BigTable，和以及数不清的其它东西” —— [Erik Goldman][71]
|
||||
|
||||
### 林纳斯·托瓦兹（Linus Torvalds） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Krd CC BY-SA 4.0][72]*
|
||||
|
||||
**成就： Linux缔造者**
|
||||
|
||||
生平：创造了 [Linux 内核][73]与[开源的版本控制系统 Git][74]。收获了许多奖项和荣誉，包括有1998年的 [EFF 先驱奖（EFF Pioneer Award）][75]，2000年荣获[英国电脑学会（British Computer Society）授予的洛夫莱斯勋章（Lovelace Medal）][76]，2012年荣获[千禧技术奖（Millenium Technology Prize）][77]还有2014年[IEEE计算机学会（ IEEE Computer Society）授予的计算机先驱奖（Computer Pioneer Award）][78]。同样入选了2008年的[计算机历史博物馆（ Computer History Museum）名人录（Hall of Fellows）][79]与2012年的[互联网名人堂（Internet Hall of Fame ）][80]。
|
||||
|
||||
评论：
|
||||
|
||||
> “他只用了几年的时间就写出了 Linux 内核，而 GNU Hurd（GNU 开发的内核）历经25年的开发却丝毫没有准备发布的意思。他的成就就是带来了希望。” —— [Erich Ficker][81]
|
||||
|
||||
> “托沃兹可能是程序员的程序员。” —— [Dan Allen][82]
|
||||
|
||||
> “他真的很棒。” —— [Alok Tripathy][83]
|
||||
|
||||
### 约翰·卡马克（John Carmack） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [QuakeCon CC BY 2.0][84]*
|
||||
|
||||
**成就： 毁灭战士的缔造者**
|
||||
|
||||
生平： ID 社联合创始人，打造了德军总部3D（Wolfenstein 3D）、毁灭战士（Doom）和雷神之锤（Quake）等所谓的即时 FPS 游戏。引领了[切片适配刷新（adaptive tile refresh）][86]， [二叉空间分割（binary space partitioning）][87]，表面缓存（surface caching）等开创性的计算机图像技术。2001年入选[互动艺术与科学学会名人堂（Academy of Interactive Arts and Sciences Hall of Fame）][88]，2007年和2008年荣获工程技术类[艾美奖（Emmy awards）][89]并于2010年由[游戏开发者甄选奖（ Game Developers Choice Awards）][90]授予终生成就奖。
|
||||
|
||||
评论：
|
||||
|
||||
> “他在写第一个渲染引擎的时候不到20岁。这家伙这是个天才。我若有他四分之一的天赋便心满意足了。” —— [Alex Dolinsky][91]
|
||||
|
||||
> “... 德军总部3D（Wolfenstein 3D）、毁灭战士（Doom）还有雷神之锤（Quake）在那时都是革命性的，影响了一代游戏设计师。” —— [dniblock][92]
|
||||
|
||||
> “一个周末他几乎可以写出任何东西....” —— [Greg Naughton][93]
|
||||
|
||||
> “他是编程界的莫扎特... ” —— [Chris Morris][94]
|
||||
|
||||
### 法布里斯·贝拉（Fabrice Bellard） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Duff][95]*
|
||||
|
||||
**成就： 创造了 QEMU**
|
||||
|
||||
生平： 创造了[一系列耳熟能详的开源软件][96]，其中包括硬件模拟和虚拟化的平台 QEMU，用于处理多媒体数据的 FFmpeg，微型C编译器（Tiny C Compiler）和 一个可执行文件压缩软件 LZEXE。2000年和2001年[C语言混乱代码大赛（Obfuscated C Code Contest）的获胜者][97]并在2011年荣获[Google-O'Reilly 开源奖（Google-O'Reilly Open Source Award ）][98]。[计算 Pi 最多位数][99]的前世界纪录保持着。
|
||||
|
||||
评论：
|
||||
|
||||
|
||||
> “我觉得法布里斯·贝拉做的每一件事都是那么显著而又震撼。” —— [raphinou][100]
|
||||
|
||||
> “法布里斯·贝拉是世界上最高产的程序员...” —— [Pavan Yara][101]
|
||||
|
||||
> “他就像软件工程界的尼古拉·特斯拉（Nikola Tesla）。” —— [Michael Valladolid][102]
|
||||
|
||||
> “自80年代以来，他一直高产出一系列的成功作品。” —— [Michael Biggins][103]
|
||||
|
||||
### Jon Skeet ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Craig Murphy CC BY 2.0][104]*
|
||||
|
||||
**成就： Stack Overflow 的传说级贡献者**
|
||||
|
||||
生平： Google 工程师，[深入解析C#（C# in Depth）][105]的作者。保持着[有史以来在 Stack Overflow 上最高的声誉][106]，平均每月解答390个问题。
|
||||
|
||||
评论：
|
||||
|
||||
|
||||
> “他根本不需要调试器，只要他盯一下代码，错误之处自会原形毕露。” —— [Steven A. Lowe][107]
|
||||
|
||||
> “如果他的代码没有通过编译，那编译器应该道歉。” —— [Dan Dyer][108]
|
||||
|
||||
> “他根本不需要什么编程规范，他的代码就是编程规范。” —— [佚名][109]
|
||||
|
||||
### 亚当·安捷罗（Adam D'Angelo） ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Philip Neustrom CC BY 2.0][110]*
|
||||
|
||||
**成就： Quora 的创办人之一**
|
||||
|
||||
生平： 还是 Facebook 工程师时，[为其搭建了 news feed 功能的基础][111]。直至其离开并联合创始了 Quora，已经成为了 Facebook 的CTO和工程 VP。2001年以高中生的身份在[美国计算机奥林匹克（USA Computing Olympiad）上第八位完成比赛][112]。2004年ACM国际大学生编程大赛（International Collegiate Programming Contest）[获得银牌的团队 - 加利福尼亚技术研究所（ California Institute of Technology）][113]的成员。2005年入围 Topcoder 大学生[算法编程挑战赛（Algorithm Coding Competition）][114]。
|
||||
|
||||
评论：
|
||||
|
||||
> “一位程序设计全才。” —— [佚名][115]
|
||||
|
||||
> "我做的每个好东西，他都已有了六个。" —— [马克.扎克伯格（Mark Zuckerberg）][116]
|
||||
|
||||
### Petr Mitrechev ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Facebook][117]*
|
||||
|
||||
**成就： 有史以来最具竞技能力的程序员之一**
|
||||
|
||||
生平： 在国际信息学奥林匹克（International Olympiad in Informatics）中[两次获得金牌][118]（2000，2002）。在2006，[赢得 Google Code Jam][119] 同时也是[TopCoder Open 算法大赛冠军][120]。也同样，两次赢得 Facebook黑客杯（Facebook Hacker Cup）（[2011][121]，[2013][122]）。写这篇文章的时候，[TopCoder 榜中排第二][123] （即：Petr）、在 [Codeforces 榜同样排第二][124]。
|
||||
|
||||
评论：
|
||||
|
||||
> “他是竞技程序员的偶像，即使在印度也是如此...” —— [Kavish Dwivedi][125]
|
||||
|
||||
### Gennady Korotkevich ###
|
||||
|
||||
|
||||
|
||||
*图片来源： [Ishandutta2007 CC BY-SA 3.0][126]*
|
||||
|
||||
**成就： 竞技编程小神童**
|
||||
|
||||
生平： 国际信息学奥林匹克（International Olympiad in Informatics）中最小参赛者（11岁），[6次获得金牌][127] (2007-2012)。2013年 ACM 国际大学生编程大赛（International Collegiate Programming Contest）[获胜队伍][128]成员及[2014 Facebook 黑客杯（Facebook Hacker Cup）][129]获胜者。写这篇文章的时候，[Codeforces 榜排名第一][130] （即：Tourist）、[TopCoder榜第一][131]。
|
||||
|
||||
评论：
|
||||
|
||||
> “一个编程神童！” —— [Prateek Joshi][132]
|
||||
|
||||
> “Gennady 真是棒，也是为什么我在白俄罗斯拥有一个强大开发团队的例证。” —— [Chris Howard][133]
|
||||
|
||||
> “Tourist 真是天才” —— [Nuka Shrinivas Rao][134]
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.itworld.com/article/2823547/enterprise-software/158256-superclass-14-of-the-world-s-best-living-programmers.html#slide1
|
||||
|
||||
作者：[Phil Johnson][a]
|
||||
译者：[martin2011qi](https://github.com/martin2011qi)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.itworld.com/author/Phil-Johnson/
|
||||
[1]:https://www.flickr.com/photos/tombullock/15713223772
|
||||
[2]:https://commons.wikimedia.org/wiki/File:Margaret_Hamilton_in_action.jpg
|
||||
[3]:http://klabs.org/home_page/hamilton.htm
|
||||
[4]:https://www.youtube.com/watch?v=DWcITjqZtpU&feature=youtu.be&t=3m12s
|
||||
[5]:http://www.htius.com/Articles/r12ham.pdf
|
||||
[6]:http://www.htius.com/Articles/Inside_DBTF.htm
|
||||
[7]:http://www.nasa.gov/home/hqnews/2003/sep/HQ_03281_Hamilton_Honor.html
|
||||
[8]:http://www.nasa.gov/50th/50th_magazine/scientists.html
|
||||
[9]:https://books.google.com/books?id=JcmV0wfQEoYC&pg=PA321&lpg=PA321&dq=ada+lovelace+award+1986&source=bl&ots=qGdBKsUa3G&sig=bkTftPAhM1vZ_3VgPcv-38ggSNo&hl=en&sa=X&ved=0CDkQ6AEwBGoVChMI3paoxJHWxwIVA3I-Ch1whwPn#v=onepage&q=ada%20lovelace%20award%201986&f=false
|
||||
[10]:http://history.nasa.gov/alsj/a11/a11Hamilton.html
|
||||
[11]:https://www.reddit.com/r/pics/comments/2oyd1y/margaret_hamilton_with_her_code_lead_software/cmrswof
|
||||
[12]:http://qr.ae/RFEZLk
|
||||
[13]:http://qr.ae/RFEZUn
|
||||
[14]:https://www.reddit.com/r/pics/comments/2oyd1y/margaret_hamilton_with_her_code_lead_software/cmrv9u9
|
||||
[15]:https://www.flickr.com/photos/44451574@N00/5347112697
|
||||
[16]:http://cs.stanford.edu/~uno/taocp.html
|
||||
[17]:http://awards.acm.org/award_winners/knuth_1013846.cfm
|
||||
[18]:http://amturing.acm.org/award_winners/knuth_1013846.cfm
|
||||
[19]:http://www.nsf.gov/od/nms/recip_details.jsp?recip_id=198
|
||||
[20]:http://www.ieee.org/documents/von_neumann_rl.pdf
|
||||
[21]:http://www.computerhistory.org/fellowawards/hall/bios/Donald,Knuth/
|
||||
[22]:http://www.quora.com/Who-are-the-best-programmers-in-Silicon-Valley-and-why/answers/3063
|
||||
[23]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Jaap-Weel
|
||||
[24]:http://qr.ae/RFE94x
|
||||
[25]:http://amturing.acm.org/photo/thompson_4588371.cfm
|
||||
[26]:https://www.youtube.com/watch?v=JoVQTPbD6UY
|
||||
[27]:https://www.bell-labs.com/usr/dmr/www/bintro.html
|
||||
[28]:http://doc.cat-v.org/bell_labs/utf-8_history
|
||||
[29]:http://c2.com/cgi/wiki?EdIsTheStandardTextEditor
|
||||
[30]:http://amturing.acm.org/award_winners/thompson_4588371.cfm
|
||||
[31]:http://www.computer.org/portal/web/awards/cp-thompson
|
||||
[32]:http://www.uspto.gov/about/nmti/recipients/1998.jsp
|
||||
[33]:http://www.computerhistory.org/fellowawards/hall/bios/Ken,Thompson/
|
||||
[34]:http://www.quora.com/Computer-Programming/Who-is-the-best-programmer-in-the-world-right-now/answer/Pete-Prokopowicz-1
|
||||
[35]:http://qr.ae/RFEWBY
|
||||
[36]:https://groups.google.com/forum/#!msg/net.unix-wizards/8twfRPM79u0/1xlglzrWrU0J
|
||||
[37]:http://www.emacswiki.org/emacs/RichardStallman
|
||||
[38]:https://www.gnu.org/gnu/thegnuproject.html
|
||||
[39]:http://www.emacswiki.org/emacs/FreeSoftwareFoundation
|
||||
[40]:http://awards.acm.org/award_winners/stallman_9380313.cfm
|
||||
[41]:https://w2.eff.org/awards/pioneer/1998.php
|
||||
[42]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Greg-Naughton/comment/4146397
|
||||
[43]:http://qr.ae/RFEaib
|
||||
[44]:http://www.quora.com/Software-Engineering/Who-are-some-of-the-greatest-currently-active-software-architects-in-the-world/answer/Marko-Poutiainen
|
||||
[45]:http://qr.ae/RFEUqp
|
||||
[46]:https://www.flickr.com/photos/begley/2979906130
|
||||
[47]:http://www.taoyue.com/tutorials/pascal/history.html
|
||||
[48]:http://c2.com/cgi/wiki?AndersHejlsberg
|
||||
[49]:http://www.microsoft.com/about/technicalrecognition/anders-hejlsberg.aspx
|
||||
[50]:http://www.drdobbs.com/windows/dr-dobbs-excellence-in-programming-award/184404602
|
||||
[51]:http://qr.ae/RFEZrv
|
||||
[52]:http://www.quora.com/Software-Engineering/Who-are-some-of-the-greatest-currently-active-software-architects-in-the-world/answer/Stefan-Kiryazov
|
||||
[53]:https://www.flickr.com/photos/vonguard/4076389963/
|
||||
[54]:http://www.wizards-of-os.org/archiv/sprecher/a_c/doug_cutting.html
|
||||
[55]:http://hadoop.apache.org/
|
||||
[56]:https://www.linkedin.com/in/cutting
|
||||
[57]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Shalin-Shekhar-Mangar/comment/2293071
|
||||
[58]:http://www.quora.com/Who-are-the-best-programmers-in-Silicon-Valley-and-why/answer/Amit-Nithianandan
|
||||
[59]:http://awards.acm.org/award_winners/ghemawat_1482280.cfm
|
||||
[60]:http://research.google.com/pubs/SanjayGhemawat.html
|
||||
[61]:http://www.quora.com/Google/Who-is-Sanjay-Ghemawat
|
||||
[62]:http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=02062009
|
||||
[63]:http://awards.acm.org/award_winners/ghemawat_1482280.cfm
|
||||
[64]:http://www.quora.com/Google/Who-is-Sanjay-Ghemawat/answer/Ahmet-Alp-Balkan
|
||||
[65]:http://research.google.com/people/jeff/index.html
|
||||
[66]:http://research.google.com/people/jeff/index.html
|
||||
[67]:http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=02062009
|
||||
[68]:http://news.cs.washington.edu/2012/10/10/uw-cse-ph-d-alum-jeff-dean-wins-2012-sigops-mark-weiser-award/
|
||||
[69]:http://awards.acm.org/award_winners/dean_2879385.cfm
|
||||
[70]:http://www.quora.com/Computer-Programming/Who-is-the-best-programmer-in-the-world-right-now/answer/Natu-Lauchande
|
||||
[71]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Cosmin-Negruseri/comment/28399
|
||||
[72]:https://commons.wikimedia.org/wiki/File:LinuxCon_Europe_Linus_Torvalds_05.jpg
|
||||
[73]:http://www.linuxfoundation.org/about/staff#torvalds
|
||||
[74]:http://git-scm.com/book/en/Getting-Started-A-Short-History-of-Git
|
||||
[75]:https://w2.eff.org/awards/pioneer/1998.php
|
||||
[76]:http://www.bcs.org/content/ConWebDoc/14769
|
||||
[77]:http://www.zdnet.com/blog/open-source/linus-torvalds-wins-the-tech-equivalent-of-a-nobel-prize-the-millennium-technology-prize/10789
|
||||
[78]:http://www.computer.org/portal/web/pressroom/Linus-Torvalds-Named-Recipient-of-the-2014-IEEE-Computer-Society-Computer-Pioneer-Award
|
||||
[79]:http://www.computerhistory.org/fellowawards/hall/bios/Linus,Torvalds/
|
||||
[80]:http://www.internethalloffame.org/inductees/linus-torvalds
|
||||
[81]:http://qr.ae/RFEeeo
|
||||
[82]:http://qr.ae/RFEZLk
|
||||
[83]:http://www.quora.com/Software-Engineering/Who-are-some-of-the-greatest-currently-active-software-architects-in-the-world/answer/Alok-Tripathy-1
|
||||
[84]:https://www.flickr.com/photos/quakecon/9434713998
|
||||
[85]:http://doom.wikia.com/wiki/John_Carmack
|
||||
[86]:http://thegamershub.net/2012/04/gaming-gods-john-carmack/
|
||||
[87]:http://www.shamusyoung.com/twentysidedtale/?p=4759
|
||||
[88]:http://www.interactive.org/special_awards/details.asp?idSpecialAwards=6
|
||||
[89]:http://www.itworld.com/article/2951105/it-management/a-fly-named-for-bill-gates-and-9-other-unusual-honors-for-tech-s-elite.html#slide8
|
||||
[90]:http://www.gamechoiceawards.com/archive/lifetime.html
|
||||
[91]:http://qr.ae/RFEEgr
|
||||
[92]:http://www.itworld.com/answers/topic/software/question/whos-best-living-programmer#comment-424562
|
||||
[93]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Greg-Naughton
|
||||
[94]:http://money.cnn.com/2003/08/21/commentary/game_over/column_gaming/
|
||||
[95]:http://dufoli.wordpress.com/2007/06/23/ammmmaaaazing-night/
|
||||
[96]:http://bellard.org/
|
||||
[97]:http://www.ioccc.org/winners.html#B
|
||||
[98]:http://www.oscon.com/oscon2011/public/schedule/detail/21161
|
||||
[99]:http://bellard.org/pi/pi2700e9/
|
||||
[100]:https://news.ycombinator.com/item?id=7850797
|
||||
[101]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Erik-Frey/comment/1718701
|
||||
[102]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Erik-Frey/comment/2454450
|
||||
[103]:http://qr.ae/RFEjhZ
|
||||
[104]:https://www.flickr.com/photos/craigmurphy/4325516497
|
||||
[105]:http://www.amazon.co.uk/gp/product/1935182471?ie=UTF8&tag=developetutor-21&linkCode=as2&camp=1634&creative=19450&creativeASIN=1935182471
|
||||
[106]:http://stackexchange.com/leagues/1/alltime/stackoverflow
|
||||
[107]:http://meta.stackexchange.com/a/9156
|
||||
[108]:http://meta.stackexchange.com/a/9138
|
||||
[109]:http://meta.stackexchange.com/a/9182
|
||||
[110]:https://www.flickr.com/photos/philipn/5326344032
|
||||
[111]:http://www.crunchbase.com/person/adam-d-angelo
|
||||
[112]:http://www.exeter.edu/documents/Exeter_Bulletin/fall_01/oncampus.html
|
||||
[113]:http://icpc.baylor.edu/community/results-2004
|
||||
[114]:https://www.topcoder.com/tc?module=Static&d1=pressroom&d2=pr_022205
|
||||
[115]:http://qr.ae/RFfOfe
|
||||
[116]:http://www.businessinsider.com/in-new-alleged-ims-mark-zuckerberg-talks-about-adam-dangelo-2012-9#ixzz369FcQoLB
|
||||
[117]:https://www.facebook.com/hackercup/photos/a.329665040399024.91563.133954286636768/553381194694073/?type=1
|
||||
[118]:http://stats.ioinformatics.org/people/1849
|
||||
[119]:http://googlepress.blogspot.com/2006/10/google-announces-winner-of-global-code_27.html
|
||||
[120]:http://community.topcoder.com/tc?module=SimpleStats&c=coder_achievements&d1=statistics&d2=coderAchievements&cr=10574855
|
||||
[121]:https://www.facebook.com/notes/facebook-hacker-cup/facebook-hacker-cup-finals/208549245827651
|
||||
[122]:https://www.facebook.com/hackercup/photos/a.329665040399024.91563.133954286636768/553381194694073/?type=1
|
||||
[123]:http://community.topcoder.com/tc?module=AlgoRank
|
||||
[124]:http://codeforces.com/ratings
|
||||
[125]:http://www.quora.com/Respected-Software-Engineers/Who-are-some-of-the-best-programmers-in-the-world/answer/Venkateswaran-Vicky/comment/1960855
|
||||
[126]:http://commons.wikimedia.org/wiki/File:Gennady_Korot.jpg
|
||||
[127]:http://stats.ioinformatics.org/people/804
|
||||
[128]:http://icpc.baylor.edu/regionals/finder/world-finals-2013/standings
|
||||
[129]:https://www.facebook.com/hackercup/posts/10152022955628845
|
||||
[130]:http://codeforces.com/ratings
|
||||
[131]:http://community.topcoder.com/tc?module=AlgoRank
|
||||
[132]:http://www.quora.com/Computer-Programming/Who-is-the-best-programmer-in-the-world-right-now/answer/Prateek-Joshi
|
||||
[133]:http://www.quora.com/Computer-Programming/Who-is-the-best-programmer-in-the-world-right-now/answer/Prateek-Joshi/comment/4720779
|
||||
[134]:http://www.quora.com/Computer-Programming/Who-is-the-best-programmer-in-the-world-right-now/answer/Prateek-Joshi/comment/4880549
|
||||
[135]:http://commons.wikimedia.org/wiki/File:Jielbeaumadier_richard_stallman_2010.jpg
|
||||
@ -0,0 +1,44 @@
|
||||
好奇 Linux？试试云端的 Linux 桌面
|
||||
================================================================================
|
||||
Linux 在桌面操作系统市场上只占据了非常小的份额，从目前的调查结果来看，估计只有2%的市场份额；对比来看，丰富多变的 Windows 系统占据了接近90%的市场份额。对于 Linux 来说，要挑战 Windows 在桌面操作系统市场的垄断，需要有一个让用户学习不同的操作系统的简单方式。如果你相信传统的 Windows 用户会再买一台机器来使用 Linux，那你就太天真了。我们只能去试想用户重新分区，设置引导程序来使用双系统，或者跳过所有步骤回到一个最简单的方法。
|
||||
|
||||
|
||||
|
||||
我们实验过一系列让用户试操作 Linux 的无风险的使用方法，不涉及任何分区管理，包括 CD/DVD 光盘、USB 存储棒和桌面虚拟化软件等等。通过实验，我强烈推荐使用 VMware 的 VMware Player 或者 Oracle VirtualBox 虚拟机，对于桌面操作系统或者便携式电脑的用户，这是一种安装运行多操作系统的相对简单而且免费的的方法。每一台虚拟机和其他虚拟机相隔离，但是共享 CPU、内存、网络接口等等。虚拟机仍需要一定的资源来安装运行 Linux，也需要一台相当强劲的主机。但对于一个好奇心不大的人，这样做实在是太麻烦了。
|
||||
|
||||
要打破用户传统的使用观念是非常困难的。很多 Windows 用户可以尝试使用 Linux 提供的自由软件，但也有太多要学习的 Linux 系统知识。这会花掉他们相当一部分时间才能习惯 Linux 的工作方式。
|
||||
|
||||
当然了，对于一个第一次在 Linux 上操作的新手，有没有一个更高效的方法呢？答案是肯定的，接着往下看看云实验平台。
|
||||
|
||||
### LabxNow ###
|
||||
|
||||
|
||||
|
||||
LabxNow 提供了一个免费服务，方便广大用户通过浏览器来访问远程 Linux 桌面。开发者将其加强为一个用户个人远程实验室（用户可以在系统里运行、开发任何程序），用户可以在任何地方通过互联网登入远程实验室。
|
||||
|
||||
这项服务现在可以为个人用户提供2核处理器，4GB RAM和10GB的固态硬盘，运行在128G RAM的4 AMD 6272处理器上。
|
||||
|
||||
#### 配置参数: ####
|
||||
|
||||
- 系统镜像：基于 Ubuntu 14.04 的 Xface 4.10，RHEL 6.5，CentOS(Gnome桌面)，Oracle
|
||||
- 硬件: CPU - 1核或者2核；内存: 512MB, 1GB, 2GB or 4GB
|
||||
- 超快的网络数据传输
|
||||
- 可以运行在所有流行的浏览器上
|
||||
- 可以安装任意程序，可以运行任何程序 – 这是一个非常棒的方法，可以随意做实验学习你想学的任何知识，没有 一点风险
|
||||
- 添加、删除、管理、制定虚拟机非常方便
|
||||
- 支持虚拟机共享，远程桌面
|
||||
|
||||
你所需要的只是一台有稳定网络的设备。不用担心虚拟专用系统（VPS）、域名、或者硬件带来的高费用。LabxNow提供了一个在 Ubuntu、RHEL 和 CentOS 上实验的非常好的方法。它给 Windows 用户提供一个极好的环境，让他们探索美妙的 Linux 世界。说得深入一点，它可以让用户随时随地在里面工作，而没有了要在每台设备上安装 Linux 的压力。点击下面这个链接进入 [www.labxnow.org/labxweb/][1]。
|
||||
|
||||
另外还有一些其它服务（大部分是收费服务）可以让用户使用 Linux，包括 Cloudsigma 环境的7天使用权和Icebergs.io （通过HTML5实现root权限）。但是现在，我推荐 LabxNow。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
来自: http://www.linuxlinks.com/article/20151003095334682/LinuxCloud.html
|
||||
|
||||
译者：[sevenot](https://github.com/sevenot)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:https://www.labxnow.org/labxweb/
|
||||
@ -0,0 +1,113 @@
|
||||
用浏览器管理 Docker
|
||||
================================================================================
|
||||
Docker 越来越流行了。在一个容器里面而不是虚拟机里运行一个完整的操作系统是一种非常棒的技术和想法。docker 已经通过节省工作时间来拯救了成千上万的系统管理员和开发人员。这是一个开源技术，提供一个平台来把应用程序当作容器来打包、分发、共享和运行，而不用关注主机上运行的操作系统是什么。它没有开发语言、框架或打包系统的限制，并且可以在任何时间、任何地点运行，从小型计算机到高端服务器都可以。运行 docker 容器和管理它们可能会花费一点点努力和时间，所以现在有一款基于 web 的应用程序－DockerUI，可以让管理和运行容器变得很简单。DockerUI 是一个对那些不熟悉 Linux 命令行，但又很想运行容器化程序的人很有帮助的工具。DockerUI 是一个开源的基于 web 的应用程序，它最值得称道的是它华丽的设计和用来运行和管理 docker 的简洁的操作界面。
|
||||
|
||||
下面会介绍如何在 Linux 上安装配置 DockerUI。
|
||||
|
||||
### 1. 安装 docker ###
|
||||
|
||||
首先，我们需要安装 docker。我们得感谢 docker 的开发者，让我们可以简单的在主流 linux 发行版上安装 docker。为了安装 docker，我们得在对应的发行版上使用下面的命令。
|
||||
|
||||
#### Ubuntu/Fedora/CentOS/RHEL/Debian ####
|
||||
|
||||
docker 维护者已经写了一个非常棒的脚本，用它可以在 Ubuntu 15.04/14.10/14.04、 CentOS 6.x/7、 Fedora 22、 RHEL 7 和 Debian 8.x 这几个 linux 发行版上安装 docker。这个脚本可以识别出我们的机器上运行的 linux 的发行版本，然后将需要的源库添加到文件系统、并更新本地的安装源目录，最后安装 docker 及其依赖库。要使用这个脚本安装docker，我们需要在 root 用户或者 sudo 权限下运行如下的命令，
|
||||
|
||||
# curl -sSL https://get.docker.com/ | sh
|
||||
|
||||
#### OpenSuse/SUSE Linux 企业版 ####
|
||||
|
||||
要在运行了 OpenSuse 13.1/13.2 或者 SUSE Linux Enterprise Server 12 的机器上安装 docker，我们只需要简单的执行zypper 命令。运行下面的命令就可以安装最新版本的docker：
|
||||
|
||||
# zypper in docker
|
||||
|
||||
#### ArchLinux ####
|
||||
|
||||
docker 在 ArchLinux 的官方源和社区维护的 AUR 库中可以找到。所以在 ArchLinux 上我们有两种方式来安装 docker。使用官方源安装，需要执行下面的 pacman 命令：
|
||||
|
||||
# pacman -S docker
|
||||
|
||||
如果要从社区源 AUR 安装 docker，需要执行下面的命令：
|
||||
|
||||
# yaourt -S docker-git
|
||||
|
||||
### 2. 启动 ###
|
||||
|
||||
安装好 docker 之后，我们需要运行 docker 守护进程，然后才能运行并管理 docker 容器。我们需要使用下列命令来确认 docker 守护进程已经安装并运行了。
|
||||
|
||||
#### 在 SysVinit 上####
|
||||
|
||||
# service docker start
|
||||
|
||||
#### 在Systemd 上####
|
||||
|
||||
# systemctl start docker
|
||||
|
||||
### 3. 安装 DockerUI ###
|
||||
|
||||
安装 DockerUI 比安装 docker 要简单很多。我们仅仅需要从 docker 注册库上拉取 dockerui ，然后在容器里面运行。要完成这些，我们只需要简单的执行下面的命令：
|
||||
|
||||
# docker run -d -p 9000:9000 --privileged -v /var/run/docker.sock:/var/run/docker.sock dockerui/dockerui
|
||||
|
||||
|
||||
|
||||
在上面的命令里，dockerui 使用的默认端口是9000，我们需要使用`-p` 命令映射默认端口。使用`-v` 标志我们可以指定docker 的 socket。如果主机使用了 SELinux 那么就得使用`--privileged` 标志。
|
||||
|
||||
执行完上面的命令后，我们要检查 DockerUI 容器是否运行了，或者使用下面的命令检查：
|
||||
|
||||
# docker ps
|
||||
|
||||
|
||||
|
||||
### 4. 拉取 docker 镜像 ###
|
||||
|
||||
现在我们还不能直接使用 DockerUI 拉取镜像，所以我们需要在命令行下拉取 docker 镜像。要完成这些我们需要执行下面的命令。
|
||||
|
||||
# docker pull ubuntu
|
||||
|
||||
|
||||
|
||||
上面的命令将会从 docker 官方源 [Docker Hub][1]拉取一个标志为 ubuntu 的镜像。类似的我们可以从 Hub 拉取需要的其它镜像。
|
||||
|
||||
### 4. 管理 ###
|
||||
|
||||
启动了 DockerUI 容器之后，我们可以用它来执行启动、暂停、终止、删除以及 DockerUI 提供的其它操作 docker 容器的命令。
|
||||
|
||||
首先，我们需要在 web 浏览器里面打开 dockerui：在浏览器里面输入 http://ip-address:9000 或者 http://mydomain.com:9000，具体要根据你的系统配置。默认情况下登录不需要认证，但是可以配置我们的 web 服务器来要求登录认证。要启动一个容器，我们需要有包含我们要运行的程序的镜像。
|
||||
|
||||
#### 创建 ####
|
||||
|
||||
创建容器我们需要在 Images 页面里，点击我们想创建的容器的镜像 id。然后点击 `Create` 按钮，接下来我们就会被要求输入创建容器所需要的属性。这些都完成之后，我们需要点击按钮`Create` 完成最终的创建。
|
||||
|
||||
|
||||
|
||||
#### 停止 ####
|
||||
|
||||
要停止一个容器，我们只需要跳转到`Containers` 页面，然后选取要停止的容器。然后在 Action 的子菜单里面按下 Stop 就行了。
|
||||
|
||||
|
||||
|
||||
#### 暂停与恢复 ####
|
||||
|
||||
要暂停一个容器，只需要简单的选取目标容器，然后点击 Pause 就行了。恢复一个容器只需要在 Actions 的子菜单里面点击 Unpause 就行了。
|
||||
|
||||
#### 删除 ####
|
||||
|
||||
类似于我们上面完成的任务，杀掉或者删除一个容器或镜像也是很简单的。只需要检查、选择容器或镜像，然后点击 Kill 或者 Remove 就行了。
|
||||
|
||||
### 结论 ###
|
||||
|
||||
DockerUI 使用了 docker 远程 API 提供了一个很棒的管理 docker 容器的 web 界面。它的开发者们完全使用 HTML 和 JS 设计、开发了这个应用。目前这个程序还处于开发中，并且还有大量的工作要完成，所以我们并不推荐将它应用在生产环境。它可以帮助用户简单的完成管理容器和镜像，而且只需要一点点工作。如果想要为 DockerUI 做贡献，可以访问它们的 [Github 仓库][2]。如果有问题、建议、反馈，请写在下面的评论框，这样我们就可以修改或者更新我们的内容。谢谢。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://linoxide.com/linux-how-to/setup-dockerui-web-interface-docker/
|
||||
|
||||
作者：[Arun Pyasi][a]
|
||||
译者：[oska874](https://github.com/oska874)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/arunp/
|
||||
[1]:https://hub.docker.com/
|
||||
[2]:https://github.com/crosbymichael/dockerui/
|
||||
@ -1,4 +1,3 @@
|
||||
|
||||
如何在 Linux 终端下创建新的文件系统/分区
|
||||
================================================================================
|
||||
|
||||
@ -13,8 +12,7 @@
|
||||
|
||||
|
||||
|
||||
|
||||
一旦你运行了 `lsblk`，你应该会看到当前系统上每个磁盘的详细列表。看看这个列表，然后找出你想要使用的磁盘。在本文中，我将使用 `sdb` 来进行演示。
|
||||
当你运行了 `lsblk`，你应该会看到当前系统上每个磁盘的详细列表。看看这个列表，然后找出你想要使用的磁盘。在本文中，我将使用 `sdb` 来进行演示。
|
||||
|
||||
在终端输入这个命令。它会显示一个功能强大的基于终端的分区编辑程序。
|
||||
|
||||
@ -26,9 +24,7 @@
|
||||
|
||||
当输入此命令后，你将进入分区编辑器中，然后访问你想改变的磁盘。
|
||||
|
||||
Since hard drive partitions are different, depending on a user’s needs, this part of the guide will go over **how to set up a split Linux home/root system layout**.
|
||||
|
||||
由于磁盘分区的不同，这取决于用户的需求，这部分的指南将在 **如何建立一个分布的 Linux home/root 文件分区**。
|
||||
由于磁盘分区的不同，这取决于用户的需求，这部分的指南将在 **如何建立一个分离的 Linux home/root 分区布局**。
|
||||
|
||||
首先，需要创建根分区。这需要根据磁盘的字节数来进行分割。我测试的磁盘是 32 GB。
|
||||
|
||||
@ -38,7 +34,7 @@ Since hard drive partitions are different, depending on a user’s needs, this p
|
||||
|
||||
该程序会要求你输入分区大小。一旦你指定好大小后，按 Enter 键。这将被称为根分区（或 /dev/sdb1）。
|
||||
|
||||
接下来该创建用户分区（/dev/sdb2）了。你需要在 CFdisk 中再选择一些空闲分区。使用箭头选择 [ NEW ] 选项，然后按 Enter 键。输入你用户分区的大小，然后按 Enter 键来创建它。
|
||||
接下来该创建 home 分区（/dev/sdb2）了。你需要在 CFdisk 中再选择一些空闲分区。使用箭头选择 [ NEW ] 选项，然后按 Enter 键。输入你的 home 分区的大小，然后按 Enter 键来创建它。
|
||||
|
||||
|
||||
|
||||
@ -48,7 +44,7 @@ Since hard drive partitions are different, depending on a user’s needs, this p
|
||||
|
||||
|
||||
|
||||
现在，交换分区被创建了，该指定其类型。使用上下箭头来选择它。之后，使用左右箭头选择 [ TYPE ] 。找到 Linux swap 选项，然后按 Enter 键。
|
||||
现在，创建了交换分区，该指定其类型。使用上下箭头来选择它。之后，使用左右箭头选择 [ TYPE ] 。找到 Linux swap 选项，然后按 Enter 键。
|
||||
|
||||
|
||||
|
||||
@ -56,13 +52,13 @@ Since hard drive partitions are different, depending on a user’s needs, this p
|
||||
|
||||
### 使用 mkfs 创建文件系统 ###
|
||||
|
||||
有时候，你并不需要一个完整的分区，你只想要创建一个文件系统而已。你可以在终端直接使用 `mkfs` 命令来实现。
|
||||
有时候，你并不需要一个整个重新分区，你只想要创建一个文件系统而已。你可以在终端直接使用 `mkfs` 命令来实现。
|
||||
|
||||
|
||||
|
||||
首先，找出你要使用的磁盘。在终端输入 `lsblk` 找出来。它会打印出列表，之后只要找到你想制作文件系统的分区或盘符。
|
||||
首先，找出你要使用的磁盘。在终端输入 `lsblk` 找出来。它会打印出列表，之后只要找到你想创建文件系统的分区或盘符。
|
||||
|
||||
在这个例子中，我将使用 `/dev/sdb1` 的第一个分区。只对 `/dev/sdb` 使用 mkfs（将会使用整个分区）。
|
||||
在这个例子中，我将使用第二个硬盘的 `/dev/sdb1` 作为第一个分区。可以对 `/dev/sdb` 使用 mkfs（这将会使用整个分区）。
|
||||
|
||||
|
||||
|
||||
@ -70,13 +66,13 @@ Since hard drive partitions are different, depending on a user’s needs, this p
|
||||
|
||||
sudo mkfs.ext4 /dev/sdb1
|
||||
|
||||
在终端。应当指出的是，`mkfs.ext4` 可以将你指定的任何文件系统改变。
|
||||
在终端。应当指出的是，`mkfs.ext4` 可以换成任何你想要使用的的文件系统。
|
||||
|
||||
### 结论 ###
|
||||
|
||||
虽然使用图形工具编辑文件系统和分区更容易，但终端可以说是更有效的。终端的加载速度更快，点击几个按钮即可。GParted 和其它工具一样，它也是一个完整的工具。我希望在本教程的帮助下，你会明白如何在终端中高效的编辑文件系统。
|
||||
|
||||
你是否更喜欢使用基于终端的方法在 Linux 上编辑分区？为什么或为什么不？在下面告诉我们！
|
||||
你是否更喜欢使用基于终端的方法在 Linux 上编辑分区？不管是不是，请在下面告诉我们。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
@ -84,7 +80,7 @@ via: https://www.maketecheasier.com/create-file-systems-partitions-terminal-linu
|
||||
|
||||
作者：[Derrik Diener][a]
|
||||
译者：[strugglingyouth](https://github.com/strugglingyouth)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
@ -1,5 +1,4 @@
|
||||
|
||||
Linux 有问必答 - 如何在 Linux 上找到当前正在使用的 shell
|
||||
Linux 有问必答：如何知道当前正在使用的 shell 是哪个？
|
||||
================================================================================
|
||||
> **问题**: 我经常在命令行中切换 shell。是否有一个快速简便的方法来找出我当前正在使用的 shell 呢？此外，我怎么能找到当前 shell 的版本？
|
||||
|
||||
@ -7,36 +6,30 @@ Linux 有问必答 - 如何在 Linux 上找到当前正在使用的 shell
|
||||
|
||||
有多种方式可以查看你目前在使用什么 shell，最简单的方法就是通过使用 shell 的特殊参数。
|
||||
|
||||
其一，[一个名为 "$$" 的特殊参数][1] 表示当前你正在运行的 shell 的 PID。此参数是只读的，不能被修改。所以，下面的命令也将显示你正在运行的 shell 的名字：
|
||||
其一，[一个名为 "$$" 的特殊参数][1] 表示当前你正在运行的 shell 实例的 PID。此参数是只读的，不能被修改。所以，下面的命令也将显示你正在运行的 shell 的名字：
|
||||
|
||||
$ ps -p $$
|
||||
|
||||
----------
|
||||
|
||||
PID TTY TIME CMD
|
||||
21666 pts/4 00:00:00 bash
|
||||
|
||||
上述命令可在所有可用的 shell 中工作。
|
||||
|
||||
如果你不使用 csh，使用 shell 的特殊参数 “$$” 可以找出当前的 shell，这表示当前正在运行的 shell 或 shell 脚本的名称。这是 Bash 的一个特殊参数，但也可用在其他 shells 中，如 sh, zsh, tcsh or dash。使用 echo 命令也可以查看你目前正在使用的 shell 的名称。
|
||||
如果你不使用 csh，找到当前使用的 shell 的另外一个办法是使用特殊参数 “$0” ，它表示当前正在运行的 shell 或 shell 脚本的名称。这是 Bash 的一个特殊参数，但也可用在其他 shell 中，如 sh、zsh、tcsh 或 dash。使用 echo 命令可以查看你目前正在使用的 shell 的名称。
|
||||
|
||||
$ echo $0
|
||||
|
||||
----------
|
||||
|
||||
bash
|
||||
|
||||
不要将 $SHELL 看成是一个单独的环境变量，它被设置为整个路径下的默认 shell。因此，这个变量并不一定指向你当前使用的 shell。例如，即使你在终端中调用不同的 shell，$SHELL 也保持不变。
|
||||
不要被一个叫做 $SHELL 的单独的环境变量所迷惑，它被设置为你的默认 shell 的完整路径。因此，这个变量并不一定指向你当前使用的 shell。例如，即使你在终端中调用不同的 shell，$SHELL 也保持不变。
|
||||
|
||||
$ echo $SHELL
|
||||
|
||||
----------
|
||||
|
||||
/bin/shell
|
||||
|
||||
|
||||
|
||||
因此，找出当前的shell，你应该使用 $$ 或 $0，但不是 $ SHELL。
|
||||
因此，找出当前的shell，你应该使用 $$ 或 $0，但不是 $SHELL。
|
||||
|
||||
### 找出当前 Shell 的版本 ###
|
||||
|
||||
@ -46,8 +39,6 @@ Linux 有问必答 - 如何在 Linux 上找到当前正在使用的 shell
|
||||
|
||||
$ bash --version
|
||||
|
||||
----------
|
||||
|
||||
GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu)
|
||||
Copyright (C) 2013 Free Software Foundation, Inc.
|
||||
License GPLv3+: GNU GPL version 3 or later
|
||||
@ -59,23 +50,17 @@ Linux 有问必答 - 如何在 Linux 上找到当前正在使用的 shell
|
||||
|
||||
$ zsh --version
|
||||
|
||||
----------
|
||||
|
||||
zsh 5.0.7 (x86_64-pc-linux-gnu)
|
||||
|
||||
**对于** tcsh **shell**:
|
||||
$ tcsh --version
|
||||
|
||||
----------
|
||||
|
||||
tcsh 6.18.01 (Astron) 2012-02-14 (x86_64-unknown-linux) options wide,nls,dl,al,kan,rh,nd,color,filec
|
||||
|
||||
对于一些 shells，你还可以使用 shell 特定的变量（例如，$ BASH_VERSION 或 $ ZSH_VERSION）。
|
||||
对于某些 shell，你还可以使用 shell 特定的变量（例如，$BASH_VERSION 或 $ZSH_VERSION）。
|
||||
|
||||
$ echo $BASH_VERSION
|
||||
|
||||
----------
|
||||
|
||||
4.3.8(1)-release
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
@ -84,7 +69,7 @@ via: http://ask.xmodulo.com/which-shell-am-i-using.html
|
||||
|
||||
作者：[Dan Nanni][a]
|
||||
译者：[strugglingyouth](https://github.com/strugglingyouth)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
@ -0,0 +1,68 @@
|
||||
如何在 Ubuntu 15.10，14.04 中安装 NVIDIA 358.16 驱动程序
|
||||
================================================================================
|
||||
|
||||
|
||||
[NVIDIA 358.16][1] —— NVIDIA 358 系列的第一个稳定版本已经发布，并对 358.09 中（测试版）做了一些修正，以及一些小的改进。
|
||||
|
||||
NVIDIA 358 增加了一个新的 **nvidia-modeset.ko** 内核模块，可以配合 nvidia.ko 内核模块工作来调用 GPU 显示引擎。在以后发布版本中，**nvidia-modeset.ko** 内核驱动程序将被用于模式设置接口的基础，该接口由内核的直接渲染管理器（DRM）所提供。
|
||||
|
||||
新的驱动程序也有新的 GLX 协议扩展，以及在 OpenGL 驱动中分配大量内存的系统内存分配新机制。新的 GPU **GeForce 805A** 和 **GeForce GTX 960A** 都支持。NVIDIA 358.16 也支持 X.Org 1.18 服务器和 OpenGL 4.3。
|
||||
|
||||
### 如何在 Ubuntu 中安装 NVIDIA 358.16 : ###
|
||||
|
||||
> **请不要在生产设备上安装，除非你知道自己在做什么以及如何才能恢复。**
|
||||
|
||||
对于官方的二进制文件，请到 [nvidia.com/object/unix.html][1] 查看。
|
||||
|
||||
对于那些喜欢 Ubuntu PPA 的，我建议你使用 [显卡驱动 PPA][2]。到目前为止，支持 Ubuntu 16.04, Ubuntu 15.10, Ubuntu 15.04, Ubuntu 14.04。
|
||||
|
||||
**1. 添加 PPA.**
|
||||
|
||||
通过按 `Ctrl+Alt+T` 快捷键来从 Unity 桌面打开终端。当打启动应用后，粘贴下面的命令并按回车键：
|
||||
|
||||
sudo add-apt-repository ppa:graphics-drivers/ppa
|
||||
|
||||
|
||||
|
||||
它会要求你输入密码。输入密码后，密码不会显示在屏幕上，按 Enter 继续。
|
||||
|
||||
**2. 刷新并安装新的驱动程序**
|
||||
|
||||
添加 PPA 后，逐一运行下面的命令刷新软件库并安装新的驱动程序：
|
||||
|
||||
sudo apt-get update
|
||||
|
||||
sudo apt-get install nvidia-358 nvidia-settings
|
||||
|
||||
### (如果需要的话，) 卸载: ###
|
||||
|
||||
开机从 GRUB 菜单进入恢复模式，进入根控制台。然后逐一运行下面的命令：
|
||||
|
||||
重新挂载文件系统为可写：
|
||||
|
||||
mount -o remount,rw /
|
||||
|
||||
删除所有的 nvidia 包：
|
||||
|
||||
apt-get purge nvidia*
|
||||
|
||||
最后返回菜单并重新启动：
|
||||
|
||||
reboot
|
||||
|
||||
要禁用/删除显卡驱动 PPA，点击系统设置下的**软件和更新**，然后导航到**其他软件**标签。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://ubuntuhandbook.org/index.php/2015/11/install-nvidia-358-16-driver-ubuntu-15-10/
|
||||
|
||||
作者：[Ji m][a]
|
||||
译者：[strugglingyouth](https://github.com/strugglingyouth)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://ubuntuhandbook.org/index.php/about/
|
||||
[1]:http://www.nvidia.com/Download/driverResults.aspx/95921/en-us
|
||||
[2]:http://www.nvidia.com/object/unix.html
|
||||
[3]:https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa
|
||||
@ -0,0 +1,46 @@
|
||||
在 Ubuntu 15.10 上安装 Intel Graphics 安装器
|
||||
================================================================================
|
||||
|
||||
|
||||
Intel 最近发布了一个新版本的 Linux Graphics 安装器。在新版本中，将不支持 Ubuntu 15.04，而必须用 Ubuntu 15.10 Wily。
|
||||
|
||||
> Linux 版 Intel® Graphics 安装器可以让你很容易的为你的 Intel Graphics 硬件安装最新版的图形与视频驱动。它能保证你一直使用最新的增强与优化功能，并能够安装到 Intel Graphics Stack 中，来保证你在你的 Intel 图形硬件下，享受到最佳的用户体验。*现在 Linux 版的 Intel® Graphics 安装器支持最新版的 Ubuntu。*
|
||||
|
||||
|
||||
|
||||
### 安装 ###
|
||||
|
||||
**1.** 从[这个链接页面][1]中下载该安装器。当前支持 Ubuntu 15.10 的版本是1.2.1版。你可以在**系统设置 -> 详细信息**中检查你的操作系统（32位或64位）的类型。
|
||||
|
||||
|
||||
|
||||
**2.** 一旦下载完成，到下载目录中点击 .deb 安装包，用 Ubuntu 软件中心打开它，然最后点击“安装”按钮。
|
||||
|
||||
|
||||
|
||||
**3.** 为了让系统信任 Intel Graphics 安装器，你需要通过下面的命令来为它添加密钥。
|
||||
|
||||
用快捷键`Ctrl+Alt+T`或者在 Unity Dash 中的“应用程序启动器”中打开终端。依次粘贴运行下面的命令。
|
||||
|
||||
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg -O - | sudo apt-key add -
|
||||
|
||||
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-2 -O - | sudo apt-key add -
|
||||
|
||||
|
||||
|
||||
注意：在运行第一个命令的过程中，如果密钥下载完成后，光标停住不动并且一直闪烁的话，就像上面图片显示的那样，输入你的密码（输入时不会看到什么有变化）然后回车就行了。
|
||||
|
||||
最后通过 Unity Dash 或应用程序启动器打开 Intel Graphics 安装器。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://ubuntuhandbook.org/index.php/2015/11/install-intel-graphics-installer-in-ubuntu-15-10/
|
||||
|
||||
作者：[Ji m][a]
|
||||
译者：[XLCYun](https://github.com/XLCYun)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://ubuntuhandbook.org/index.php/about/
|
||||
[1]:https://01.org/linuxgraphics/downloads
|
||||
@ -1,16 +1,14 @@
|
||||
|
||||
如何在 Ubuntu 服务器中配置 AWStats
|
||||
================================================================================
|
||||
|
||||
|
||||
|
||||
AWStats 是一个开源的网站分析报告工具，自带网络,流媒体，FTP 或邮件服务器统计图。此日志分析器以 CGI 或命令行方式进行工作，并在网页中以图表的形式尽可能的显示你日志中所有的信息。它采用的是部分信息文件，以便能够频繁并快速处理大量的日志文件。它支持绝大多数 Web 服务器日志文件格式，包括 Apache，IIS 等。
|
||||
AWStats 是一个开源的网站分析报告工具，可以生成强大的网站、流媒体、FTP 或邮件服务器的访问统计图。此日志分析器以 CGI 或命令行方式进行工作，并在网页中以图表的形式尽可能的显示你日志中所有的信息。它可以“部分”读取信息文件，以便能够频繁并快速处理大量的日志文件。它支持绝大多数 Web 服务器日志文件格式，包括 Apache，IIS 等。
|
||||
|
||||
本文将帮助你在 Ubuntu 上安装配置 AWStats。
|
||||
|
||||
### 安装 AWStats 包 ###
|
||||
|
||||
默认情况下，AWStats 的包在 Ubuntu 仓库中。
|
||||
默认情况下，AWStats 的包可以在 Ubuntu 仓库中找到。
|
||||
|
||||
可以通过运行下面的命令来安装：
|
||||
|
||||
@ -18,7 +16,7 @@ AWStats 是一个开源的网站分析报告工具，自带网络,流媒体，FT
|
||||
|
||||
接下来，你需要启用 Apache 的 CGI 模块。
|
||||
|
||||
运行以下命令来启动：
|
||||
运行以下命令来启动 CGI：
|
||||
|
||||
sudo a2enmod cgi
|
||||
|
||||
@ -38,7 +36,7 @@ AWStats 是一个开源的网站分析报告工具，自带网络,流媒体，FT
|
||||
|
||||
sudo nano /etc/awstats/awstats.test.com.conf
|
||||
|
||||
像下面这样修改下:
|
||||
像下面这样修改一下:
|
||||
|
||||
# Change to Apache log file, by default it's /var/log/apache2/access.log
|
||||
LogFile="/var/log/apache2/access.log"
|
||||
@ -73,6 +71,7 @@ AWStats 是一个开源的网站分析报告工具，自带网络,流媒体，FT
|
||||
### 测试 AWStats ###
|
||||
|
||||
现在，您可以通过访问 url “http://your-server-ip/cgi-bin/awstats.pl?config=test.com.” 来查看 AWStats 的页面。
|
||||
|
||||
它的页面像下面这样：
|
||||
|
||||
|
||||
@ -101,7 +100,7 @@ via: https://www.maketecheasier.com/set-up-awstats-ubuntu/
|
||||
|
||||
作者：[Hitesh Jethva][a]
|
||||
译者：[strugglingyouth](https://github.com/strugglingyouth)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
81
published/20151123 LNAV--Ncurses based log file viewer.md
Normal file
81
published/20151123 LNAV--Ncurses based log file viewer.md
Normal file
@ -0,0 +1,81 @@
|
||||
LNAV：基于 Ncurses 的日志文件阅读器
|
||||
================================================================================
|
||||
日志文件导航器（Logfile Navigator，简称 lnav），是一个基于 curses 的，用于查看和分析日志文件的工具。和文本阅读器/编辑器相比， lnav 的好处是它充分利用了可以从日志文件中获取的语义信息，例如时间戳和日志等级。利用这些额外的语义信息， lnav 可以处理像这样的事情：来自不同文件的交错的信息；按照时间生成信息直方图；支持在文件中导航的快捷键。它希望使用这些功能可以使得用户可以快速有效地定位和解决问题。
|
||||
|
||||
### lnav 功能 ###
|
||||
|
||||
#### 支持以下日志文件格式： ####
|
||||
|
||||
Syslog、Apache 访问日志、strace、tcsh 历史以及常见的带时间戳的日志文件。读入文件的时候回自动检测文件格式。
|
||||
|
||||
#### 直方图视图： ####
|
||||
|
||||
以时间区划来显示日志信息数量。这对于大概了解在一长段时间内发生了什么非常有用。
|
||||
|
||||
#### 过滤器： ####
|
||||
|
||||
只显示那些匹配或不匹配一些正则表达式的行。对于移除大量你不感兴趣的日志行非常有用。
|
||||
|
||||
#### 即时操作： ####
|
||||
|
||||
在你输入到时候会同时完成检索；当添加了新日志行的时候会自动加载和搜索；加载行的时候会应用过滤器；另外，还会在你输入 SQL 查询的时候检查其正确性。
|
||||
|
||||
#### 自动显示后文： ####
|
||||
|
||||
日志文件视图会自动往下滚动到新添加到文件中的行。只需要向上滚动就可以锁定当前视图，然后向下滚动到底部恢复显示后文。
|
||||
|
||||
#### 按照日期顺序排序行： ####
|
||||
|
||||
从所有文件中加载的日志行会按照日期进行排序。使得你不需要手动从不同文件中收集日志信息。
|
||||
|
||||
#### 语法高亮： ####
|
||||
|
||||
错误和警告会用红色和黄色显示。高亮还可用于： SQL 关键字、XML 标签、Java 文件行号和括起来的字符串。
|
||||
|
||||
#### 导航： ####
|
||||
|
||||
有快捷键用于跳转到下一个或上一个错误或警告，按照指定的时间向后或向前翻页。
|
||||
|
||||
#### 用 SQL 查询日志： ####
|
||||
|
||||
每个日志文件行都相当于数据库中的一行，可以使用 SQL 进行查询。可以使用的列取决于查看的日志文件类型。
|
||||
|
||||
#### 命令和搜索历史： ####
|
||||
|
||||
会自动保存你之前输入的命令和搜素，因此你可以在会话之间使用它们。
|
||||
|
||||
#### 压缩文件： ####
|
||||
|
||||
会实时自动检测和解压压缩的日志文件。
|
||||
|
||||
### 在 ubuntu 15.10 上安装 lnav ####
|
||||
|
||||
打开终端运行下面的命令
|
||||
|
||||
sudo apt-get install lnav
|
||||
|
||||
### 使用 lnav ###
|
||||
|
||||
如果你想使用 lnav 查看日志，你可以使用下面的命令，默认它会显示 syslogs
|
||||
|
||||
lnav
|
||||
|
||||
|
||||
|
||||
如果你想查看特定的日志，那么需要指定路径。如果你想看 CPU 日志，在你的终端里运行下面的命令
|
||||
|
||||
lnav /var/log/cups
|
||||
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.ubuntugeek.com/lnav-ncurses-based-log-file-viewer.html
|
||||
|
||||
作者：[ruchi][a]
|
||||
译者：[ictlyh](http://mutouxiaogui.cn/blog/)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.ubuntugeek.com/author/ubuntufix
|
||||
@ -0,0 +1,59 @@
|
||||
如何在 Ubuntu 16.04，15.10，14.04 中安装 GIMP 2.8.16
|
||||
================================================================================
|
||||
|
||||
|
||||
GIMP 图像编辑器 2.8.16 版本在其20岁生日时发布了。下面是如何安装或升级 GIMP 在 Ubuntu 16.04, Ubuntu 15.10, Ubuntu 14.04, Ubuntu 12.04 及其衍生版本中，如 Linux Mint 17.x/13, Elementary OS Freya。
|
||||
|
||||
GIMP 2.8.16 支持 OpenRaster 文件中的层组，修复了 PSD 中的层组支持以及各种用户界面改进，修复了 OSX 上的构建系统，以及更多新的变化。请阅读 [官方声明][1]。
|
||||
|
||||
|
||||
|
||||
### 如何安装或升级: ###
|
||||
|
||||
多亏了 Otto Meier，[Ubuntu PPA][2] 中最新的 GIMP 包可用于当前所有的 Ubuntu 版本和其衍生版。
|
||||
|
||||
**1. 添加 GIMP PPA**
|
||||
|
||||
从 Unity Dash 中打开终端，或通过 Ctrl+Alt+T 快捷键打开。在它打开它后，粘贴下面的命令并回车：
|
||||
|
||||
sudo add-apt-repository ppa:otto-kesselgulasch/gimp
|
||||
|
||||
|
||||
|
||||
输入你的密码，密码不会在终端显示，然后回车继续。
|
||||
|
||||
**2. 安装或升级编辑器**
|
||||
|
||||
在添加了 PPA 后，启动 **Software Updater**(在 Mint 中是 Software Manager)。检查更新后，你将看到 GIMP 的更新列表。点击 “Install Now” 进行升级。
|
||||
|
||||
|
||||
|
||||
对于那些喜欢 Linux 命令的，按顺序执行下面的命令，刷新仓库的缓存然后安装 GIMP：
|
||||
|
||||
sudo apt-get update
|
||||
|
||||
sudo apt-get install gimp
|
||||
|
||||
**3. (可选的) 卸载**
|
||||
|
||||
如果你想卸载或降级 GIMP 图像编辑器。从软件中心直接删除它，或者按顺序运行下面的命令来将 PPA 清除并降级软件：
|
||||
|
||||
sudo apt-get install ppa-purge
|
||||
|
||||
sudo ppa-purge ppa:otto-kesselgulasch/gimp
|
||||
|
||||
就这样。玩的愉快！
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://ubuntuhandbook.org/index.php/2015/11/how-to-install-gimp-2-8-16-in-ubuntu-16-04-15-10-14-04/
|
||||
|
||||
作者：[Ji m][a]
|
||||
译者：[strugglingyouth](https://github.com/strugglingyouth)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://ubuntuhandbook.org/index.php/about/
|
||||
[1]:http://www.gimp.org/news/2015/11/22/20-years-of-gimp-release-of-gimp-2816/
|
||||
[2]:https://launchpad.net/~otto-kesselgulasch/+archive/ubuntu/gimp
|
||||
143
published/20151125 The tar command explained.md
Normal file
143
published/20151125 The tar command explained.md
Normal file
@ -0,0 +1,143 @@
|
||||
tar 命令使用介绍
|
||||
================================================================================
|
||||
Linux [tar][1] 命令是归档或分发文件时的强大武器。GNU tar 归档包可以包含多个文件和目录，还能保留其文件权限，它还支持多种压缩格式。Tar 表示 "**T**ape **Ar**chiver"，这种格式是 POSIX 标准。
|
||||
|
||||
### Tar 文件格式 ###
|
||||
|
||||
tar 压缩等级简介：
|
||||
|
||||
- **无压缩** 没有压缩的文件用 .tar 结尾。
|
||||
- **Gzip 压缩** Gzip 格式是 tar 使用最广泛的压缩格式，它能快速压缩和提取文件。用 gzip 压缩的文件通常用 .tar.gz 或 .tgz 结尾。这里有一些如何[创建][2]和[解压][3] tar.gz 文件的例子。
|
||||
- **Bzip2 压缩** 和 Gzip 格式相比 Bzip2 提供了更好的压缩比。创建压缩文件也比较慢，通常采用 .tar.bz2 结尾。
|
||||
- **Lzip(LAMA)压缩** Lizp 压缩结合了 Gzip 快速的优势，以及和 Bzip2 类似（甚至更好） 的压缩率。尽管有这些好处，这个格式并没有得到广泛使用。
|
||||
- **Lzop 压缩** 这个压缩选项也许是 tar 最快的压缩格式，它的压缩率和 gzip 类似，但也没有广泛使用。
|
||||
|
||||
常见的格式是 tar.gz 和 tar.bz2。如果你想快速压缩，那么就是用 gzip。如果归档文件大小比较重要，就是用 tar.bz2。
|
||||
|
||||
### tar 命令用来干什么？ ###
|
||||
|
||||
下面是一些使用 tar 命令的常见情形。
|
||||
|
||||
- 备份服务器或桌面系统
|
||||
- 文档归档
|
||||
- 软件分发
|
||||
|
||||
### 安装 tar ###
|
||||
|
||||
大部分 Linux 系统默认都安装了 tar。如果没有，这里有安装 tar 的命令。
|
||||
|
||||
#### CentOS ####
|
||||
|
||||
在 CentOS 中，以 root 用户在 shell 中执行下面的命令安装 tar。
|
||||
|
||||
yum install tar
|
||||
|
||||
#### Ubuntu ####
|
||||
|
||||
下面的命令会在 Ubuntu 上安装 tar。“sudo” 命令确保 apt 命令是以 root 权限运行的。
|
||||
|
||||
sudo apt-get install tar
|
||||
|
||||
#### Debian ####
|
||||
|
||||
下面的 apt 命令在 Debian 上安装 tar。
|
||||
|
||||
apt-get install tar
|
||||
|
||||
#### Windows ####
|
||||
|
||||
tar 命令在 Windows 也可以使用，你可以从 Gunwin 项目[http://gnuwin32.sourceforge.net/packages/gtar.htm][4]中下载它。
|
||||
|
||||
### 创建 tar.gz 文件 ###
|
||||
|
||||
下面是在 shell 中运行 [tar 命令][5] 的一些例子。下面我会解释这些命令行选项。
|
||||
|
||||
tar pczf myarchive.tar.gz /home/till/mydocuments
|
||||
|
||||
这个命令会创建归档文件 myarchive.tar.gz，其中包括了路径 /home/till/mydocuments 中的文件和目录。**命令行选项解释**：
|
||||
|
||||
- **[p]** 这个选项表示 “preserve”，它指示 tar 在归档文件中保留文件属主和权限信息。
|
||||
- **[c]** 表示创建。要创建文件时不能缺少这个选项。
|
||||
- **[z]** z 选项启用 gzip 压缩。
|
||||
- **[f]** file 选项告诉 tar 创建一个归档文件。如果没有这个选项 tar 会把输出发送到标准输出（ LCTT 译注：如果没有指定，标准输出默认是屏幕，显然你不会想在屏幕上显示一堆乱码，通常你可以用管道符号送到其它程序去）。
|
||||
|
||||
#### Tar 命令示例 ####
|
||||
|
||||
**示例 1： 备份 /etc 目录**
|
||||
|
||||
创建 /etc 配置目录的一个备份。备份保存在 root 目录。
|
||||
|
||||
tar pczvf /root/etc.tar.gz /etc
|
||||
|
||||
|
||||
|
||||
要以 root 用户运行命令确保 /etc 中的所有文件都会被包含在备份中。这次，我在命令中添加了 [v] 选项。这个选项表示 verbose，它告诉 tar 显示所有被包含到归档文件中的文件名。
|
||||
|
||||
**示例 2： 备份你的 /home 目录**
|
||||
|
||||
创建你的 home 目录的备份。备份会被保存到 /backup 目录。
|
||||
|
||||
tar czf /backup/myuser.tar.gz /home/myuser
|
||||
|
||||
用你的用户名替换 myuser。这个命令中，我省略了 [p] 选项，也就不会保存权限。
|
||||
|
||||
**示例 3： 基于文件的 MySQL 数据库备份**
|
||||
|
||||
在大部分 Linux 发行版中，MySQL 数据库保存在 /var/lib/mysql。你可以使用下面的命令来查看：
|
||||
|
||||
ls /var/lib/mysql
|
||||
|
||||
|
||||
|
||||
用 tar 备份 MySQL 数据文件时为了保持数据一致性，首先停用数据库服务器。备份会被写到 /backup 目录。
|
||||
|
||||
1） 创建 backup 目录
|
||||
|
||||
mkdir /backup
|
||||
chmod 600 /backup
|
||||
|
||||
2） 停止 MySQL，用 tar 进行备份并重新启动数据库。
|
||||
|
||||
service mysql stop
|
||||
tar pczf /backup/mysql.tar.gz /var/lib/mysql
|
||||
service mysql start
|
||||
ls -lah /backup
|
||||
|
||||
|
||||
|
||||
### 提取 tar.gz 文件###
|
||||
|
||||
提取 tar.gz 文件的命令是：
|
||||
|
||||
tar xzf myarchive.tar.gz
|
||||
|
||||
#### tar 命令选项解释 ####
|
||||
|
||||
- **[x]** x 表示提取，提取 tar 文件时这个命令不可缺少。
|
||||
- **[z]** z 选项告诉 tar 要解压的归档文件是 gzip 格式。
|
||||
- **[f]** 该选项告诉 tar 从一个文件中读取归档内容，本例中是 myarchive.tar.gz。
|
||||
|
||||
上面的 tar 命令会安静地提取 tar.gz 文件，除非有错误信息。如果你想要看提取了哪些文件，那么添加 “v” 选项。
|
||||
|
||||
tar xzvf myarchive.tar.gz
|
||||
|
||||
**[v]** 选项表示 verbose，它会向你显示解压的文件名。
|
||||
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://www.howtoforge.com/tutorial/linux-tar-command/
|
||||
|
||||
作者：[howtoforge][a]
|
||||
译者：[ictlyh](http://mutouxiaogui.cn/blog/)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://www.howtoforge.com/
|
||||
[1]:https://en.wikipedia.org/wiki/Tar_(computing)
|
||||
[2]:http://www.faqforge.com/linux/create-tar-gz/
|
||||
[3]:http://www.faqforge.com/linux/extract-tar-gz/
|
||||
[4]:http://gnuwin32.sourceforge.net/packages/gtar.htm
|
||||
[5]:http://www.faqforge.com/linux/tar-command/
|
||||
@ -1,12 +1,13 @@
|
||||
第 10 部分：在 RHEL/CentOS 7 中设置 “NTP（网络时间协议） 服务器”
|
||||
RHCE 系列（十）：在 RHEL/CentOS 7 中设置 NTP（网络时间协议）服务器
|
||||
================================================================================
|
||||
网络时间协议 - NTP - 是运行在传输层 123 号端口允许计算机通过网络同步准确时间的协议。随着时间的流逝，计算机内部时间会出现漂移，这会导致时间不一致问题，尤其是对于服务器和客户端日志文件，或者你想要备份服务器资源或数据库。
|
||||
|
||||
网络时间协议 - NTP - 是运行在传输层 123 号端口的 UDP 协议，它允许计算机通过网络同步准确时间。随着时间的流逝，计算机内部时间会出现漂移，这会导致时间不一致问题，尤其是对于服务器和客户端日志文件，或者你想要复制服务器的资源或数据库。
|
||||
|
||||
|
||||
|
||||
在 CentOS 和 RHEL 7 上安装 NTP 服务器
|
||||
*在 CentOS 和 RHEL 7 上安装 NTP 服务器*
|
||||
|
||||
#### 要求： ####
|
||||
#### 前置要求： ####
|
||||
|
||||
- [CentOS 7 安装过程][1]
|
||||
- [RHEL 安装过程][2]
|
||||
@ -17,62 +18,62 @@
|
||||
- [在 CentOS/RHCE 7 上配置静态 IP][4]
|
||||
- [在 CentOS/RHEL 7 上停用并移除不需要的服务][5]
|
||||
|
||||
这篇指南会告诉你如何在 CentOS/RHCE 7 上安装和配置 NTP 服务器，并使用 NTP 公共时间服务器池列表中和你服务器地理位置最近的可用节点中同步时间。
|
||||
这篇指南会告诉你如何在 CentOS/RHCE 7 上安装和配置 NTP 服务器，并使用 NTP 公共时间服务器池（NTP Public Pool Time Servers）列表中和你服务器地理位置最近的可用节点中同步时间。
|
||||
|
||||
#### 步骤一：安装和配置 NTP 守护进程 ####
|
||||
|
||||
1. 官方 CentOS /RHEL 7 库默认提供 NTP 服务器安装包，可以通过使用下面的命令安装。
|
||||
1、 官方 CentOS /RHEL 7 库默认提供 NTP 服务器安装包，可以通过使用下面的命令安装。
|
||||
|
||||
# yum install ntp
|
||||
|
||||
|
||||
|
||||
安装 NTP 服务器
|
||||
*安装 NTP 服务器*
|
||||
|
||||
2. 安装完服务器之后，首先到官方 [NTP 公共时间服务器池][6]，选择你服务器物理位置所在的洲，然后搜索你的国家位置，然后会出现 NTP 服务器列表。
|
||||
2、 安装完服务器之后，首先到官方 [NTP 公共时间服务器池（NTP Public Pool Time Servers）][6]，选择你服务器物理位置所在的洲，然后搜索你的国家位置，然后会出现 NTP 服务器列表。
|
||||
|
||||
|
||||
|
||||
NTP 服务器池
|
||||
*NTP 服务器池*
|
||||
|
||||
3. 然后打开编辑 NTP 守护进程主要配置文件，从 pool.ntp.org 中注释掉默认的公共服务器列表并用类似下面截图提供给你国家的列表替换。
|
||||
3、 然后打开编辑 NTP 守护进程的主配置文件，注释掉来自 pool.ntp.org 项目的公共服务器默认列表，并用类似下面截图中提供给你所在国家的列表替换。（LCTT 译注：中国使用 0.cn.pool.ntp.org 等）
|
||||
|
||||
|
||||
|
||||
配置 NTP 服务器
|
||||
*配置 NTP 服务器*
|
||||
|
||||
4. 下一步，你需要允许客户端从你的网络中和这台服务器同步时间。为了做到这点，添加下面一行到 NTP 配置文件，其中限制语句控制允许哪些网络查询和同步时间 - 根据需要替换网络 IP。
|
||||
4、 下一步，你需要允许来自你的网络的客户端和这台服务器同步时间。为了做到这点，添加下面一行到 NTP 配置文件，其中 **restrict** 语句控制允许哪些网络查询和同步时间 - 请根据需要替换网络 IP。
|
||||
|
||||
restrict 192.168.1.0 netmask 255.255.255.0 nomodify notrap
|
||||
|
||||
nomodify notrap 语句意味着不允许你的客户端配置服务器或者作为同步时间的节点。
|
||||
|
||||
5. 如果你需要额外的信息用于错误处理，以防你的 NTP 守护进程出现问题，添加一个 logfile 语句，用于记录所有 NTP 服务器问题到一个指定的日志文件。
|
||||
5、 如果你需要用于错误处理的额外信息，以防你的 NTP 守护进程出现问题，添加一个 logfile 语句，用于记录所有 NTP 服务器问题到一个指定的日志文件。
|
||||
|
||||
logfile /var/log/ntp.log
|
||||
|
||||
|
||||
|
||||
启用 NTP 日志
|
||||
*启用 NTP 日志*
|
||||
|
||||
6. 你编辑完所有上面解释的配置并保存关闭 ntp.conf 文件后，你最终的配置看起来像下面的截图。
|
||||
6、 在你编辑完所有上面解释的配置并保存关闭 ntp.conf 文件后，你最终的配置看起来像下面的截图。
|
||||
|
||||
|
||||
|
||||
NTP 服务器配置
|
||||
*NTP 服务器配置*
|
||||
|
||||
### 步骤二：添加防火墙规则并启动 NTP 守护进程 ###
|
||||
|
||||
7. NTP 服务在传输层（第四层）使用 123 号 UDP 端口。它是针对限制可变延迟的影响特别设计的。要在 RHEL/CentOS 7 中开放这个端口，可以对 Firewalld 服务使用下面的命令。
|
||||
7、 NTP 服务使用 OSI 传输层（第四层）的 123 号 UDP 端口。它是为了避免可变延迟的影响所特别设计的。要在 RHEL/CentOS 7 中开放这个端口，可以对 Firewalld 服务使用下面的命令。
|
||||
|
||||
# firewall-cmd --add-service=ntp --permanent
|
||||
# firewall-cmd --reload
|
||||
|
||||
|
||||
|
||||
在 Firewall 中开放 NTP 端口
|
||||
*在 Firewall 中开放 NTP 端口*
|
||||
|
||||
8. 你在防火墙中开放了 123 号端口之后，启动 NTP 服务器并确保系统范围内可用。用下面的命令管理服务。
|
||||
8、 你在防火墙中开放了 123 号端口之后，启动 NTP 服务器并确保系统范围内可用。用下面的命令管理服务。
|
||||
|
||||
# systemctl start ntpd
|
||||
# systemctl enable ntpd
|
||||
@ -80,34 +81,34 @@ NTP 服务器配置
|
||||
|
||||
|
||||
|
||||
启动 NTP 服务
|
||||
*启动 NTP 服务*
|
||||
|
||||
### 步骤三：验证服务器时间同步 ###
|
||||
|
||||
9. 启动了 NTP 守护进程后，用几分钟等服务器和它的服务器池列表同步时间，然后运行下面的命令验证 NTP 节点同步状态和你的系统时间。
|
||||
9、 启动了 NTP 守护进程后，用几分钟等服务器和它的服务器池列表同步时间，然后运行下面的命令验证 NTP 节点同步状态和你的系统时间。
|
||||
|
||||
# ntpq -p
|
||||
# date -R
|
||||
|
||||
|
||||
|
||||
验证 NTP 时间同步
|
||||
*验证 NTP 时间同步*
|
||||
|
||||
10. 如果你想查询或者和你选择的服务器池同步，你可以使用 ntpdate 命令，后面跟服务器名或服务器地址，类似下面建议的命令行事例。
|
||||
10、 如果你想查询或者和你选择的服务器池同步，你可以使用 ntpdate 命令，后面跟服务器名或服务器地址，类似下面建议的命令行示例。
|
||||
|
||||
# ntpdate -q 0.ro.pool.ntp.org 1.ro.pool.ntp.org
|
||||
|
||||
|
||||
|
||||
同步 NTP 时间
|
||||
*同步 NTP 时间*
|
||||
|
||||
### 步骤四：设置 Windows NTP 客户端 ###
|
||||
|
||||
11. 如果你的 windows 机器不是域名控制器的一部分，你可以配置 Windows 和你的 NTP服务器同步时间。在任务栏右边 -> 时间 -> 更改日期和时间设置 -> 网络时间标签 -> 更改设置 -> 和一个网络时间服务器检查同步 -> 在 Server 空格输入服务器 IP 或 FQDN -> 马上更新 -> OK。
|
||||
11、 如果你的 windows 机器不是域名控制器的一部分，你可以配置 Windows 和你的 NTP服务器同步时间。在任务栏右边 -> 时间 -> 更改日期和时间设置 -> 网络时间标签 -> 更改设置 -> 和一个网络时间服务器检查同步 -> 在 Server 空格输入服务器 IP 或 FQDN -> 马上更新 -> OK。
|
||||
|
||||
|
||||
|
||||
和 NTP 同步 Windows 时间
|
||||
*和 NTP 同步 Windows 时间*
|
||||
|
||||
就是这些。在你的网络中配置一个本地 NTP 服务器能确保你所有的服务器和客户端有相同的时间设置，以防出现网络连接失败，并且它们彼此都相互同步。
|
||||
|
||||
@ -117,7 +118,7 @@ via: http://www.tecmint.com/install-ntp-server-in-centos/
|
||||
|
||||
作者：[Matei Cezar][a]
|
||||
译者：[ictlyh](http://motouxiaogui.cn/blog)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
@ -1,11 +1,13 @@
|
||||
RHCE 系列： 使用网络安全服务（NSS）为 Apache 通过 TLS 实现 HTTPS
|
||||
RHCE 系列（八）：在 Apache 上使用网络安全服务（NSS）实现 HTTPS
|
||||
================================================================================
|
||||
如果你是一个负责维护和确保 web 服务器安全的系统管理员，你不能不花费最大的精力确保服务器中处理和通过的数据任何时候都受到保护。
|
||||
|
||||
如果你是一个负责维护和确保 web 服务器安全的系统管理员，你需要花费最大的精力确保服务器中处理和通过的数据任何时候都受到保护。
|
||||
|
||||
|
||||
|
||||
RHCE 系列：第八部分 - 使用网络安全服务（NSS）为 Apache 通过 TLS 实现 HTTPS
|
||||
*RHCE 系列：第八部分 - 使用网络安全服务（NSS）为 Apache 通过 TLS 实现 HTTPS*
|
||||
|
||||
为了在客户端和服务器之间提供更安全的连接，作为 HTTP 和 SSL（安全套接层）或者最近称为 TLS（传输层安全）的组合，产生了 HTTPS 协议。
|
||||
为了在客户端和服务器之间提供更安全的连接，作为 HTTP 和 SSL（Secure Sockets Layer，安全套接层）或者最近称为 TLS（Transport Layer Security，传输层安全）的组合，产生了 HTTPS 协议。
|
||||
|
||||
由于一些严重的安全漏洞，SSL 已经被更健壮的 TLS 替代。由于这个原因，在这篇文章中我们会解析如何通过 TLS 实现你 web 服务器和客户端之间的安全连接。
|
||||
|
||||
@ -22,11 +24,11 @@ RHCE 系列：第八部分 - 使用网络安全服务（NSS）为 Apache 通过
|
||||
# firewall-cmd --permanent –-add-service=http
|
||||
# firewall-cmd --permanent –-add-service=https
|
||||
|
||||
然后安装一些必须软件包：
|
||||
然后安装一些必需的软件包：
|
||||
|
||||
# yum update && yum install openssl mod_nss crypto-utils
|
||||
|
||||
**重要**：请注意如果你想使用 OpenSSL 库而不是 NSS（网络安全服务）实现 TLS，你可以在上面的命令中用 mod\_ssl 替换 mod\_nss（使用哪一个取决于你，但在这篇文章中由于更加健壮我们会使用 NSS；例如，它支持最新的加密标准，比如 PKCS #11）。
|
||||
**重要**：请注意如果你想使用 OpenSSL 库而不是 NSS（Network Security Service，网络安全服务）实现 TLS，你可以在上面的命令中用 mod\_ssl 替换 mod\_nss（使用哪一个取决于你，但在这篇文章中我们会使用 NSS，因为它更加安全，比如说，它支持最新的加密标准，比如 PKCS #11）。
|
||||
|
||||
如果你使用 mod\_nss，首先要卸载 mod\_ssl，反之如此。
|
||||
|
||||
@ -54,15 +56,15 @@ nss.conf – 配置文件
|
||||
|
||||
下一步，在 `/etc/httpd/conf.d/nss.conf` 配置文件中做以下更改：
|
||||
|
||||
1. 指定 NSS 数据库目录。你可以使用默认的目录或者新建一个。本文中我们使用默认的：
|
||||
1、 指定 NSS 数据库目录。你可以使用默认的目录或者新建一个。本文中我们使用默认的：
|
||||
|
||||
NSSCertificateDatabase /etc/httpd/alias
|
||||
|
||||
2. 通过保存密码到数据库目录中的 /etc/httpd/nss-db-password.conf 文件避免每次系统启动时要手动输入密码：
|
||||
2、 通过保存密码到数据库目录中的 `/etc/httpd/nss-db-password.conf` 文件来避免每次系统启动时要手动输入密码：
|
||||
|
||||
NSSPassPhraseDialog file:/etc/httpd/nss-db-password.conf
|
||||
|
||||
其中 /etc/httpd/nss-db-password.conf 只包含以下一行，其中 mypassword 是后面你为 NSS 数据库设置的密码：
|
||||
其中 `/etc/httpd/nss-db-password.conf` 只包含以下一行，其中 mypassword 是后面你为 NSS 数据库设置的密码：
|
||||
|
||||
internal:mypassword
|
||||
|
||||
@ -71,27 +73,27 @@ nss.conf – 配置文件
|
||||
# chmod 640 /etc/httpd/nss-db-password.conf
|
||||
# chgrp apache /etc/httpd/nss-db-password.conf
|
||||
|
||||
3. 由于 POODLE SSLv3 漏洞，红帽建议停用 SSL 和 TLSv1.0 之前所有版本的 TLS（更多信息可以查看[这里][2]）。
|
||||
3、 由于 POODLE SSLv3 漏洞，红帽建议停用 SSL 和 TLSv1.0 之前所有版本的 TLS（更多信息可以查看[这里][2]）。
|
||||
|
||||
确保 NSSProtocol 指令的每个实例都类似下面一样（如果你没有托管其它虚拟主机，很可能只有一条）：
|
||||
|
||||
NSSProtocol TLSv1.0,TLSv1.1
|
||||
|
||||
4. 由于这是一个自签名证书，Apache 会拒绝重启，并不会识别为有效发行人。由于这个原因，对于这种特殊情况我们还需要添加：
|
||||
4、 由于这是一个自签名证书，Apache 会拒绝重启，并不会识别为有效发行人。由于这个原因，对于这种特殊情况我们还需要添加：
|
||||
|
||||
NSSEnforceValidCerts off
|
||||
|
||||
5. 虽然并不是严格要求，为 NSS 数据库设置一个密码同样很重要：
|
||||
5、 虽然并不是严格要求，为 NSS 数据库设置一个密码同样很重要：
|
||||
|
||||
# certutil -W -d /etc/httpd/alias
|
||||
|
||||
|
||||
|
||||
为 NSS 数据库设置密码
|
||||
*为 NSS 数据库设置密码*
|
||||
|
||||
### 创建一个 Apache SSL 自签名证书 ###
|
||||
|
||||
下一步，我们会创建一个自签名证书为我们的客户机识别服务器（请注意这个方法对于生产环境并不是最好的选择；对于生产环境你应该考虑购买第三方可信证书机构验证的证书，例如 DigiCert）。
|
||||
下一步，我们会创建一个自签名证书来让我们的客户机可以识别服务器（请注意这个方法对于生产环境并不是最好的选择；对于生产环境你应该考虑购买第三方可信证书机构验证的证书，例如 DigiCert）。
|
||||
|
||||
我们用 genkey 命令为 box1 创建有效期为 365 天的 NSS 兼容证书。完成这一步后：
|
||||
|
||||
@ -101,19 +103,19 @@ nss.conf – 配置文件
|
||||
|
||||
|
||||
|
||||
创建 Apache SSL 密钥
|
||||
*创建 Apache SSL 密钥*
|
||||
|
||||
你可以使用默认的密钥大小（2048），然后再次选择 Next：
|
||||
|
||||
|
||||
|
||||
选择 Apache SSL 密钥大小
|
||||
*选择 Apache SSL 密钥大小*
|
||||
|
||||
等待系统生成随机比特：
|
||||
|
||||
|
||||
|
||||
生成随机密钥比特
|
||||
*生成随机密钥比特*
|
||||
|
||||
为了加快速度，会提示你在控制台输入随机字符，正如下面的截图所示。请注意当没有从键盘接收到输入时进度条是如何停止的。然后，会让你选择：
|
||||
|
||||
@ -124,35 +126,35 @@ nss.conf – 配置文件
|
||||
注：youtube 视频
|
||||
<iframe width="720" height="405" frameborder="0" src="//www.youtube.com/embed/mgsfeNfuurA" allowfullscreen="allowfullscreen"></iframe>
|
||||
|
||||
最后，会提示你输入之前设置的密码到 NSS 证书：
|
||||
最后，会提示你输入之前给 NSS 证书设置的密码：
|
||||
|
||||
# genkey --nss --days 365 box1
|
||||
|
||||
|
||||
|
||||
Apache NSS 证书密码
|
||||
*Apache NSS 证书密码*
|
||||
|
||||
在任何时候你都可以用以下命令列出现有的证书：
|
||||
需要的话，你可以用以下命令列出现有的证书：
|
||||
|
||||
# certutil –L –d /etc/httpd/alias
|
||||
|
||||
|
||||
|
||||
列出 Apache NSS 证书
|
||||
*列出 Apache NSS 证书*
|
||||
|
||||
然后通过名字删除（除非严格要求，用你自己的证书名称替换 box1）：
|
||||
然后通过名字删除（如果你真的需要删除的，用你自己的证书名称替换 box1）：
|
||||
|
||||
# certutil -d /etc/httpd/alias -D -n "box1"
|
||||
|
||||
如果你需要继续的话：
|
||||
如果你需要继续进行的话，请继续阅读。
|
||||
|
||||
### 测试 Apache SSL HTTPS 连接 ###
|
||||
|
||||
最后，是时候测试到我们服务器的安全连接了。当你用浏览器打开 https://<web 服务器 IP 或主机名\>，你会看到著名的信息 “This connection is untrusted”：
|
||||
最后，是时候测试到我们服务器的安全连接了。当你用浏览器打开 https://\<web 服务器 IP 或主机名\>，你会看到著名的信息 “This connection is untrusted”：
|
||||
|
||||
|
||||
|
||||
检查 Apache SSL 连接
|
||||
*检查 Apache SSL 连接*
|
||||
|
||||
在上面的情况中，你可以点击添加例外（Add Exception） 然后确认安全例外（Confirm Security Exception） - 但先不要这么做。让我们首先来看看证书看它的信息是否和我们之前输入的相符（如截图所示）。
|
||||
|
||||
@ -160,37 +162,37 @@ Apache NSS 证书密码
|
||||
|
||||
|
||||
|
||||
确认 Apache SSL 证书详情
|
||||
*确认 Apache SSL 证书详情*
|
||||
|
||||
现在你继续，确认例外（限于此次或永久），然后会通过 https 把你带到你 web 服务器的 DocumentRoot 目录，在这里你可以使用你浏览器自带的开发者工具检查连接详情：
|
||||
现在你可以继续，确认例外（限于此次或永久），然后会通过 https 把你带到你 web 服务器的 DocumentRoot 目录，在这里你可以使用你浏览器自带的开发者工具检查连接详情：
|
||||
|
||||
在火狐浏览器中，你可以通过在屏幕中右击然后从上下文菜单中选择检查元素（Inspect Element）启动，尤其是通过网络选项卡：
|
||||
在火狐浏览器中，你可以通过在屏幕中右击，然后从上下文菜单中选择检查元素（Inspect Element）启动开发者工具，尤其要看“网络”选项卡：
|
||||
|
||||
|
||||
|
||||
检查 Apache HTTPS 连接
|
||||
*检查 Apache HTTPS 连接*
|
||||
|
||||
请注意这和之前显示的在验证过程中输入的信息一致。还有一种方式通过使用命令行工具测试连接：
|
||||
|
||||
左边（测试 SSLv3）：
|
||||
左图（测试 SSLv3）：
|
||||
|
||||
# openssl s_client -connect localhost:443 -ssl3
|
||||
|
||||
右边（测试 TLS）：
|
||||
右图（测试 TLS）：
|
||||
|
||||
# openssl s_client -connect localhost:443 -tls1
|
||||
|
||||
|
||||
|
||||
测试 Apache SSL 和 TLS 连接
|
||||
*测试 Apache SSL 和 TLS 连接*
|
||||
|
||||
参考上面的截图了解更相信信息。
|
||||
参考上面的截图了解更详细信息。
|
||||
|
||||
### 总结 ###
|
||||
|
||||
我确信你已经知道，使用 HTTPS 会增加会在你站点中输入个人信息的访客的信任（从用户名和密码到任何商业/银行账户信息）。
|
||||
我想你已经知道，使用 HTTPS 会增加会在你站点中输入个人信息的访客的信任（从用户名和密码到任何商业/银行账户信息）。
|
||||
|
||||
在那种情况下，你会希望获得由可信验证机构签名的证书，正如我们之前解释的（启用的步骤和发送 CSR 到 CA 然后获得签名证书的例子相同）；另外的情况，就是像我们的例子中一样使用自签名证书。
|
||||
在那种情况下，你会希望获得由可信验证机构签名的证书，正如我们之前解释的（步骤和设置需要启用例外的证书的步骤相同，发送 CSR 到 CA 然后获得返回的签名证书）；否则，就像我们的例子中一样使用自签名证书即可。
|
||||
|
||||
要获取更多关于使用 NSS 的详情，可以参考关于 [mod-nss][3] 的在线帮助。如果你有任何疑问或评论，请告诉我们。
|
||||
|
||||
@ -200,11 +202,11 @@ via: http://www.tecmint.com/create-apache-https-self-signed-certificate-using-ns
|
||||
|
||||
作者：[Gabriel Cánepa][a]
|
||||
译者：[ictlyh](http://www.mutouxiaogui.cn/blog/)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.tecmint.com/install-lamp-in-centos-7/
|
||||
[1]:http://www.tecmint.com/author/gacanepa/
|
||||
[a]:http://www.tecmint.com/author/gacanepa/
|
||||
[1]:https://linux.cn/article-5789-1.html
|
||||
[2]:https://access.redhat.com/articles/1232123
|
||||
[3]:https://git.fedorahosted.org/cgit/mod_nss.git/plain/docs/mod_nss.html
|
||||
@ -1,25 +1,25 @@
|
||||
第九部分 - 如果使用零客户端配置 Postfix 邮件服务器（SMTP）
|
||||
RHCE 系列（九）：如何使用无客户端配置 Postfix 邮件服务器（SMTP）
|
||||
================================================================================
|
||||
尽管现在有很多在线联系方式，邮件仍然是一个人传递信息给远在世界尽头或办公室里坐在我们旁边的另一个人的有效方式。
|
||||
尽管现在有很多在线联系方式，电子邮件仍然是一个人传递信息给远在世界尽头或办公室里坐在我们旁边的另一个人的有效方式。
|
||||
|
||||
下面的图描述了邮件从发送者发出直到信息到达接收者收件箱的传递过程。
|
||||
下面的图描述了电子邮件从发送者发出直到信息到达接收者收件箱的传递过程。
|
||||
|
||||
|
||||
|
||||
|
||||
邮件如何工作
|
||||
*电子邮件如何工作*
|
||||
|
||||
要使这成为可能，背后发生了好多事情。为了使邮件信息从一个客户端应用程序（例如 [Thunderbird][1]、Outlook，或者网络邮件服务，例如 Gmail 或 Yahoo 邮件）到一个邮件服务器，并从其到目标服务器并最终到目标接收人，每个服务器上都必须有 SMTP（简单邮件传输协议）服务。
|
||||
要实现这一切，背后发生了好多事情。为了使电子邮件信息从一个客户端应用程序（例如 [Thunderbird][1]、Outlook，或者 web 邮件服务，例如 Gmail 或 Yahoo 邮件）投递到一个邮件服务器，并从其投递到目标服务器并最终到目标接收人，每个服务器上都必须有 SMTP（简单邮件传输协议）服务。
|
||||
|
||||
这就是为什么我们要在这篇博文中介绍如何在 RHEL 7 中设置 SMTP 服务器，从中本地用户发送的邮件（甚至发送到本地用户）被转发到一个中央邮件服务器以便于访问。
|
||||
这就是为什么我们要在这篇博文中介绍如何在 RHEL 7 中设置 SMTP 服务器，从本地用户发送的邮件（甚至发送到另外一个本地用户）被转发（forward）到一个中央邮件服务器以便于访问。
|
||||
|
||||
在实际需求中这称为零客户端安装。
|
||||
在这个考试的要求中这称为无客户端（null-client）安装。
|
||||
|
||||
在我们的测试环境中将包括一个原始邮件服务器和一个中央服务器或中继主机。
|
||||
在我们的测试环境中将包括一个起源（originating）邮件服务器和一个中央服务器或中继主机（relayhost）。
|
||||
|
||||
原始邮件服务器： （主机名: box1.mydomain.com / IP: 192.168.0.18）
|
||||
中央邮件服务器： （主机名: mail.mydomain.com / IP: 192.168.0.20）
|
||||
- 起源邮件服务器： （主机名: box1.mydomain.com / IP: 192.168.0.18）
|
||||
- 中央邮件服务器： （主机名: mail.mydomain.com / IP: 192.168.0.20）
|
||||
|
||||
为了域名解析我们在两台机器中都会使用有名的 /etc/hosts 文件：
|
||||
我们在两台机器中都会使用你熟知的 `/etc/hosts` 文件做名字解析：
|
||||
|
||||
192.168.0.18 box1.mydomain.com box1
|
||||
192.168.0.20 mail.mydomain.com mail
|
||||
@ -28,34 +28,29 @@
|
||||
|
||||
首先，我们需要（在两台机器上）：
|
||||
|
||||
**1. 安装 Postfix：**
|
||||
**1、 安装 Postfix：**
|
||||
|
||||
# yum update && yum install postfix
|
||||
|
||||
**2. 启动服务并启用开机自动启动：**
|
||||
**2、 启动服务并启用开机自动启动：**
|
||||
|
||||
# systemctl start postfix
|
||||
# systemctl enable postfix
|
||||
|
||||
**3. 允许邮件流量通过防火墙：**
|
||||
**3、 允许邮件流量通过防火墙：**
|
||||
|
||||
# firewall-cmd --permanent --add-service=smtp
|
||||
# firewall-cmd --add-service=smtp
|
||||
|
||||
|
||||
|
||||
|
||||
在防火墙中开通邮件服务器端口
|
||||
*在防火墙中开通邮件服务器端口*
|
||||
|
||||
**4. 在 box1.mydomain.com 配置 Postfix**
|
||||
**4、 在 box1.mydomain.com 配置 Postfix**
|
||||
|
||||
Postfix 的主要配置文件是 /etc/postfix/main.cf。这个文件本身是一个很大的文本，因为其中包含的注释解析了程序设置的目的。
|
||||
Postfix 的主要配置文件是 `/etc/postfix/main.cf`。这个文件本身是一个很大的文本文件，因为其中包含了解释程序设置的用途的注释。
|
||||
|
||||
为了简洁，我们只显示了需要编辑的行（是的，在原始服务器中你需要保留 mydestination 为空；否则邮件会被保存到本地而不是我们实际想要的中央邮件服务器）：
|
||||
|
||||
**在 box1.mydomain.com 配置 Postfix**
|
||||
|
||||
----------
|
||||
为了简洁，我们只显示了需要编辑的行（没错，在起源服务器中你需要保留 `mydestination` 为空；否则邮件会被存储到本地，而不是我们实际想要发往的中央邮件服务器）：
|
||||
|
||||
myhostname = box1.mydomain.com
|
||||
mydomain = mydomain.com
|
||||
@ -64,11 +59,7 @@ Postfix 的主要配置文件是 /etc/postfix/main.cf。这个文件本身是一
|
||||
mydestination =
|
||||
relayhost = 192.168.0.20
|
||||
|
||||
**5. 在 mail.mydomain.com 配置 Postfix**
|
||||
|
||||
** 在 mail.mydomain.com 配置 Postfix **
|
||||
|
||||
----------
|
||||
**5、 在 mail.mydomain.com 配置 Postfix**
|
||||
|
||||
myhostname = mail.mydomain.com
|
||||
mydomain = mydomain.com
|
||||
@ -83,23 +74,23 @@ Postfix 的主要配置文件是 /etc/postfix/main.cf。这个文件本身是一
|
||||
|
||||
|
||||
|
||||
设置 Postfix SELinux 权限
|
||||
*设置 Postfix SELinux 权限*
|
||||
|
||||
上面的 SELinux 布尔值会允许 Postfix 在中央服务器写入邮件池。
|
||||
上面的 SELinux 布尔值会允许中央服务器上的 Postfix 可以写入邮件池（mail spool）。
|
||||
|
||||
**6. 在两台机子上重启服务以使更改生效：**
|
||||
**6、 在两台机子上重启服务以使更改生效：**
|
||||
|
||||
# systemctl restart postfix
|
||||
|
||||
如果 Postfix 没有正确启动，你可以使用下面的命令进行错误处理。
|
||||
|
||||
# systemctl –l status postfix
|
||||
# journalctl –xn
|
||||
# postconf –n
|
||||
# systemctl -l status postfix
|
||||
# journalctl -xn
|
||||
# postconf -n
|
||||
|
||||
### 测试 Postfix 邮件服务 ###
|
||||
|
||||
为了测试邮件服务器，你可以使用任何邮件用户代理（最常见的简称为 MUA）例如 [mail 或 mutt][2]。
|
||||
要测试邮件服务器，你可以使用任何邮件用户代理（Mail User Agent，常简称为 MUA），例如 [mail 或 mutt][2]。
|
||||
|
||||
由于我个人喜欢 mutt，我会在 box1 中使用它发送邮件给用户 tecmint，并把现有文件（mailbody.txt）作为信息内容：
|
||||
|
||||
@ -107,7 +98,7 @@ Postfix 的主要配置文件是 /etc/postfix/main.cf。这个文件本身是一
|
||||
|
||||
|
||||
|
||||
测试 Postfix 邮件服务器
|
||||
*测试 Postfix 邮件服务器*
|
||||
|
||||
现在到中央邮件服务器（mail.mydomain.com）以 tecmint 用户登录，并检查是否收到了邮件：
|
||||
|
||||
@ -116,15 +107,15 @@ Postfix 的主要配置文件是 /etc/postfix/main.cf。这个文件本身是一
|
||||
|
||||
|
||||
|
||||
检查 Postfix 邮件服务器发送
|
||||
*检查 Postfix 邮件服务器发送*
|
||||
|
||||
如果没有收到邮件，检查 root 用户的邮件池查看警告或者错误提示。你也需要使用 [nmap 命令][3]确保两台服务器运行了 SMTP 服务，并在中央邮件服务器中 打开了 25 号端口：
|
||||
如果没有收到邮件，检查 root 用户的邮件池看看是否有警告或者错误提示。你也许需要使用 [nmap 命令][3]确保两台服务器运行了 SMTP 服务，并在中央邮件服务器中打开了 25 号端口：
|
||||
|
||||
# nmap -PN 192.168.0.20
|
||||
|
||||
|
||||
|
||||
Postfix 邮件服务器错误处理
|
||||
*Postfix 邮件服务器错误处理*
|
||||
|
||||
### 总结 ###
|
||||
|
||||
@ -134,7 +125,7 @@ Postfix 邮件服务器错误处理
|
||||
|
||||
- [在 CentOS/RHEL 07 上配置仅缓存的 DNS 服务器][4]
|
||||
|
||||
最后，我强烈建议你熟悉 Postfix 的配置文件（main.cf）和这个程序的帮助手册。如果有任何疑问，别犹豫，使用下面的评论框或者我们的论坛 Linuxsay.com 告诉我们吧，你会从世界各地的 Linux 高手中获得几乎及时的帮助。
|
||||
最后，我强烈建议你熟悉 Postfix 的配置文件（main.cf）和这个程序的帮助手册。如果有任何疑问，别犹豫，使用下面的评论框或者我们的论坛 Linuxsay.com 告诉我们吧，你会从世界各地的 Linux 高手中获得几乎是及时的帮助。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
@ -142,7 +133,7 @@ via: http://www.tecmint.com/setup-postfix-mail-server-smtp-using-null-client-on-
|
||||
|
||||
作者：[Gabriel Cánepa][a]
|
||||
译者：[ictlyh](https//www.mutouxiaogui.cn/blog/)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
@ -0,0 +1,41 @@
|
||||
Apple Swift Programming Language Comes To Linux
|
||||
================================================================================
|
||||
|
||||
|
||||
Apple and Open Source toogether? Yes! Apple’s Swift programming language is now open source. This should not come as surprise because [Apple had already announced it six months back][1].
|
||||
|
||||
Apple announced the launch of open source Swift community came this week. A [new website][2] dedicated to the open source Swift community has been put in place with the following message:
|
||||
|
||||
> We are excited by this new chapter in the story of Swift. After Apple unveiled the Swift programming language, it quickly became one of the fastest growing languages in history. Swift makes it easy to write software that is incredibly fast and safe by design. Now that Swift is open source, you can help make the best general purpose programming language available everywhere.
|
||||
|
||||
[swift.org][2] will work as the one stop shop providing downloads for various platforms, community guidelines, news, getting started tutorials, instructions for contribution to open source Swift, documentation and other guidelines. If you are looking forward to learn Swift, this website must be bookmarked.
|
||||
|
||||
In this announcement, a new package manager for easy sharing and building code has been made available as well.
|
||||
|
||||
Most important of all for Linux users, the source code is now available at [Github][3]. You can check it out from the link below:
|
||||
|
||||
- [Apple Swift Source Code][3]
|
||||
|
||||
In addition to that, there are prebuilt binaries for Ubuntu 14.04 and 15.10.
|
||||
|
||||
- [Swift binaries for Ubuntu][4]
|
||||
|
||||
Don’t rush to use them because these are development branches and will not be suitable for production machine. So avoid it for now. Once stable version of Swift for Linux is released, I hope that Ubuntu will include it in [umake][5] on the line of [Visual Studio][6].
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://itsfoss.com/swift-open-source-linux/
|
||||
|
||||
作者：[Abhishek][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://itsfoss.com/author/abhishek/
|
||||
[1]:http://itsfoss.com/apple-open-sources-swift-programming-language-linux/
|
||||
[2]:https://swift.org/
|
||||
[3]:https://github.com/apple
|
||||
[4]:https://swift.org/download/#latest-development-snapshots
|
||||
[5]:https://wiki.ubuntu.com/ubuntu-make
|
||||
[6]:http://itsfoss.com/install-visual-studio-code-ubuntu/
|
||||
44
sources/news/Let's Encrypt--Entering Public Beta.md
Normal file
44
sources/news/Let's Encrypt--Entering Public Beta.md
Normal file
@ -0,0 +1,44 @@
|
||||
Let's Encrypt:Entering Public Beta
|
||||
================================================================================
|
||||
We’re happy to announce that Let’s Encrypt has entered Public Beta. Invitations are no longer needed in order to get free
|
||||
certificates from Let’s Encrypt.
|
||||
|
||||
It’s time for the Web to take a big step forward in terms of security and privacy. We want to see HTTPS become the default.
|
||||
Let’s Encrypt was built to enable that by making it as easy as possible to get and manage certificates.
|
||||
|
||||
We’d like to thank everyone who participated in the Limited Beta. Let’s Encrypt issued over 26,000 certificates during the
|
||||
Limited Beta period. This allowed us to gain valuable insight into how our systems perform, and to be confident about moving
|
||||
to Public Beta.
|
||||
|
||||
We’d also like to thank all of our [sponsors][1] for their support. We’re happy to have announced earlier today that
|
||||
[Facebook is our newest Gold sponsor][2]/
|
||||
|
||||
We have more work to do before we’re comfortable dropping the beta label entirely, particularly on the client experience.
|
||||
Automation is a cornerstone of our strategy, and we need to make sure that the client works smoothly and reliably on a
|
||||
wide range of platforms. We’ll be monitoring feedback from users closely, and making improvements as quickly as possible.
|
||||
|
||||
Instructions for getting a certificate with the [Let’s Encrypt client][3] can be found [here][4].
|
||||
|
||||
[Let’s Encrypt Community Support][5] is an invaluable resource for our community, we strongly recommend making use of the
|
||||
site if you have any questions about Let’s Encrypt.
|
||||
|
||||
Let’s Encrypt depends on support from a wide variety of individuals and organizations. Please consider [getting involved][6]
|
||||
, and if your company or organization would like to sponsor Let’s Encrypt please email us at [sponsor@letsencrypt.org][7].
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://letsencrypt.org/2015/12/03/entering-public-beta.html
|
||||
|
||||
作者：[Josh Aas][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://letsencrypt.org/2015/12/03/entering-public-beta.html
|
||||
[1]:https://letsencrypt.org/sponsors/
|
||||
[2]:https://letsencrypt.org/2015/12/03/facebook-sponsorship.html
|
||||
[3]:https://github.com/letsencrypt/letsencrypt
|
||||
[4]:https://letsencrypt.readthedocs.org/en/latest/
|
||||
[5]:https://community.letsencrypt.org/
|
||||
[6]:https://letsencrypt.org/getinvolved/
|
||||
[7]:mailto:sponsor@letsencrypt.org
|
||||
@ -1,605 +0,0 @@
|
||||
|
||||
translation by strugglingyouth
|
||||
80 Linux Monitoring Tools for SysAdmins
|
||||
================================================================================
|
||||
|
||||
|
||||
The industry is hotting up at the moment, and there are more tools than you can shake a stick at. Here lies the most comprehensive list on the Internet (of Tools). Featuring over 80 ways to your machines. Within this article we outline:
|
||||
|
||||
- Command line tools
|
||||
- Network related
|
||||
- System related monitoring
|
||||
- Log monitoring tools
|
||||
- Infrastructure monitoring tools
|
||||
|
||||
It’s hard work monitoring and debugging performance problems, but it’s easier with the right tools at the right time. Here are some tools you’ve probably heard of, some you probably haven’t – and when to use them:
|
||||
|
||||
### Top 10 System Monitoring Tools ###
|
||||
|
||||
#### 1. Top ####
|
||||
|
||||
|
||||
|
||||
This is a small tool which is pre-installed in many unix systems. When you want an overview of all the processes or threads running in the system: top is a good tool. You can order these processes on different criteria and the default criteria is CPU.
|
||||
|
||||
#### 2. [htop][1] ####
|
||||
|
||||
|
||||
|
||||
Htop is essentially an enhanced version of top. It’s easier to sort by processes. It’s visually easier to understand and has built in commands for common things you would like to do. Plus it’s fully interactive.
|
||||
|
||||
#### 3. [atop][2] ####
|
||||
|
||||
Atop monitors all processes much like top and htop, unlike top and htop however it has daily logging of the processes for long-term analysis. It also shows resource consumption by all processes. It will also highlight resources that have reached a critical load.
|
||||
|
||||
#### 4. [apachetop][3] ####
|
||||
|
||||
Apachetop monitors the overall performance of your apache webserver. It’s largely based on mytop. It displays current number of reads, writes and the overall number of requests processed.
|
||||
|
||||
#### 5. [ftptop][4] ####
|
||||
|
||||
ftptop gives you basic information of all the current ftp connections to your server such as the total amount of sessions, how many are uploading and downloading and who the client is.
|
||||
|
||||
#### 6. [mytop][5] ####
|
||||
|
||||
|
||||
|
||||
mytop is a neat tool for monitoring threads and performance of mysql. It gives you a live look into the database and what queries it’s processing in real time.
|
||||
|
||||
#### 7. [powertop][6] ####
|
||||
|
||||
|
||||
|
||||
powertop helps you diagnose issues that has to do with power consumption and power management. It can also help you experiment with power management settings to achieve the most efficient settings for your server. You switch tabs with the tab key.
|
||||
|
||||
#### 8. [iotop][7] ####
|
||||
|
||||
|
||||
|
||||
iotop checks the I/O usage information and gives you a top-like interface to that. It displays columns on read and write and each row represents a process. It also displays the percentage of time the process spent while swapping in and while waiting on I/O.
|
||||
|
||||
### Network related monitoring ###
|
||||
|
||||
#### 9. [ntopng][8] ####
|
||||
|
||||
|
||||
|
||||
ntopng is the next generation of ntop and the tool provides a graphical user interface via the browser for network monitoring. It can do stuff such as: geolocate hosts, get network traffic and show ip traffic distribution and analyze it.
|
||||
|
||||
#### 10. [iftop][9] ####
|
||||
|
||||
|
||||
|
||||
iftop is similar to top, but instead of mainly checking for cpu usage it listens to network traffic on selected network interfaces and displays a table of current usage. It can be handy for answering questions such as “Why on earth is my internet connection so slow?!”.
|
||||
|
||||
#### 11. [jnettop][10] ####
|
||||
|
||||
|
||||
|
||||
jnettop visualises network traffic in much the same way as iftop does. It also supports customizable text output and a machine-friendly mode to support further analysis.
|
||||
|
||||
12. [bandwidthd][11]
|
||||
|
||||
|
||||
|
||||
BandwidthD tracks usage of TCP/IP network subnets and visualises that in the browser by building a html page with graphs in png. There is a database driven system that supports searching, filtering, multiple sensors and custom reports.
|
||||
|
||||
#### 13. [EtherApe][12] ####
|
||||
|
||||
EtherApe displays network traffic graphically, the more talkative the bigger the node. It either captures live traffic or can read it from a tcpdump. The displayed can also be refined using a network filter with pcap syntax.
|
||||
|
||||
#### 14. [ethtool][13] ####
|
||||
|
||||
|
||||
|
||||
ethtool is used for displaying and modifying some parameters of the network interface controllers. It can also be used to diagnose Ethernet devices and get more statistics from the devices.
|
||||
|
||||
#### 15. [NetHogs][14] ####
|
||||
|
||||
|
||||
|
||||
NetHogs breaks down network traffic per protocol or per subnet. It then groups by process. So if there’s a surge in network traffic you can fire up NetHogs and see which process is causing it.
|
||||
|
||||
#### 16. [iptraf][15] ####
|
||||
|
||||
|
||||
|
||||
iptraf gathers a variety of metrics such as TCP connection packet and byte count, interface statistics and activity indicators, TCP/UDP traffic breakdowns and station packet and byte counts.
|
||||
|
||||
#### 17. [ngrep][16] ####
|
||||
|
||||
|
||||
|
||||
ngrep is grep but for the network layer. It’s pcap aware and will allow to specify extended regular or hexadecimal expressions to match against packets of .
|
||||
|
||||
#### 18. [MRTG][17] ####
|
||||
|
||||
|
||||
|
||||
MRTG was orginally developed to monitor router traffic, but now it’s able to monitor other network related things as well. It typically collects every five minutes and then generates a html page. It also has the capability of sending warning emails.
|
||||
|
||||
#### 19. [bmon][18] ####
|
||||
|
||||
|
||||
|
||||
Bmon monitors and helps you debug networks. It captures network related statistics and presents it in human friendly way. You can also interact with bmon through curses or through scripting.
|
||||
|
||||
#### 20. traceroute ####
|
||||
|
||||
|
||||
|
||||
Traceroute is a built-in tool for displaying the route and measuring the delay of packets across a network.
|
||||
|
||||
#### 21. [IPTState][19] ####
|
||||
|
||||
IPTState allows you to watch where traffic that crosses your iptables is going and then sort that by different criteria as you please. The tool also allows you to delete states from the table.
|
||||
|
||||
#### 22. [darkstat][20] ####
|
||||
|
||||
|
||||
|
||||
Darkstat captures network traffic and calculates statistics about usage. The reports are served over a simple HTTP server and gives you a nice graphical user interface of the graphs.
|
||||
|
||||
#### 23. [vnStat][21] ####
|
||||
|
||||
|
||||
|
||||
vnStat is a network traffic monitor that uses statistics provided by the kernel which ensures light use of system resources. The gathered statistics persists through system reboots. It has color options for the artistic sysadmins.
|
||||
|
||||
#### 24. netstat ####
|
||||
|
||||
|
||||
|
||||
Netstat is a built-in tool that displays TCP network connections, routing tables and a number of network interfaces. It’s used to find problems in the network.
|
||||
|
||||
#### 25. ss ####
|
||||
|
||||
Instead of using netstat, it’s however preferable to use ss. The ss command is capable of showing more information than netstat and is actually faster. If you want a summary statistics you can use the command `ss -s`.
|
||||
|
||||
#### 26. [nmap][22] ####
|
||||
|
||||
|
||||
|
||||
Nmap allows you to scan your server for open ports or detect which OS is being used. But you could also use this for SQL injection vulnerabilities, network discovery and other means related to penetration testing.
|
||||
|
||||
#### 27. [MTR][23] ####
|
||||
|
||||
|
||||
|
||||
MTR combines the functionality of traceroute and the ping tool into a single network diagnostic tool. When using the tool it will limit the number hops individual packets has to travel while also listening to their expiry. It then repeats this every second.
|
||||
|
||||
#### 28. [Tcpdump][24] ####
|
||||
|
||||
|
||||
|
||||
Tcpdump will output a description of the contents of the packet it just captured which matches the expression that you provided in the command. You can also save the this data for further analysis.
|
||||
|
||||
#### 29. [Justniffer][25] ####
|
||||
|
||||
|
||||
|
||||
Justniffer is a tcp packet sniffer. You can choose whether you would like to collect low-level data or high-level data with this sniffer. It also allows you to generate logs in customizable way. You could for instance mimic the access log that apache has.
|
||||
|
||||
### System related monitoring ###
|
||||
|
||||
#### 30. [nmon][26] ####
|
||||
|
||||
|
||||
|
||||
nmon either outputs the data on screen or saves it in a comma separated file. You can display CPU, memory, network, filesystems, top processes. The data can also be added to a RRD database for further analysis.
|
||||
|
||||
#### 31. [conky][27] ####
|
||||
|
||||
|
||||
|
||||
Conky monitors a plethora of different OS stats. It has support for IMAP and POP3 and even support for many popular music players! For the handy person you could extend it with your own scripts or programs using Lua.
|
||||
|
||||
#### 32. [Glances][28] ####
|
||||
|
||||
|
||||
|
||||
Glances monitors your system and aims to present a maximum amount of information in a minimum amount of space. It has the capability to function in a client/server mode as well as monitoring remotely. It also has a web interface.
|
||||
|
||||
#### 33. [saidar][29] ####
|
||||
|
||||
|
||||
|
||||
Saidar is a very small tool that gives you basic information about your system resources. It displays a full screen of the standard system resources. The emphasis for saidar is being as simple as possible.
|
||||
|
||||
#### 34. [RRDtool][30] ####
|
||||
|
||||
|
||||
|
||||
RRDtool is a tool developed to handle round-robin databases or RRD. RRD aims to handle time-series data like CPU load, temperatures etc. This tool provides a way to extract RRD data in a graphical format.
|
||||
|
||||
#### 35. [monit][31] ####
|
||||
|
||||
|
||||
|
||||
Monit has the capability of sending you alerts as well as restarting services if they run into trouble. It’s possible to perform any type of check you could write a script for with monit and it has a web user interface to ease your eyes.
|
||||
|
||||
#### 36. [Linux process explorer][32] ####
|
||||
|
||||
|
||||
|
||||
Linux process explorer is akin to the activity monitor for OSX or the windows equivalent. It aims to be more usable than top or ps. You can view each process and see how much memory usage or CPU it uses.
|
||||
|
||||
#### 37. df ####
|
||||
|
||||
|
||||
|
||||
df is an abbreviation for disk free and is pre-installed program in all unix systems used to display the amount of available disk space for filesystems which the user have access to.
|
||||
|
||||
#### 38. [discus][33] ####
|
||||
|
||||
|
||||
|
||||
Discus is similar to df however it aims to improve df by making it prettier using fancy features as colors, graphs and smart formatting of numbers.
|
||||
|
||||
#### 39. [xosview][34] ####
|
||||
|
||||
|
||||
|
||||
xosview is a classic system monitoring tool and it gives you a simple overview of all the different parts of the including IRQ.
|
||||
|
||||
#### 40. [Dstat][35] ####
|
||||
|
||||
|
||||
|
||||
Dstat aims to be a replacement for vmstat, iostat, netstat and ifstat. It allows you to view all of your system resources in real-time. The data can then be exported into csv. Most importantly dstat allows for plugins and could thus be extended into areas not yet known to mankind.
|
||||
|
||||
#### 41. [Net-SNMP][36] ####
|
||||
|
||||
SNMP is the protocol ‘simple network management protocol’ and the Net-SNMP tool suite helps you collect accurate information about your servers using this protocol.
|
||||
|
||||
#### 42. [incron][37] ####
|
||||
|
||||
Incron allows you to monitor a directory tree and then take action on those changes. If you wanted to copy files to directory ‘b’ once new files appeared in directory ‘a’ that’s exactly what incron does.
|
||||
|
||||
#### 43. [monitorix][38] ####
|
||||
|
||||
Monitorix is lightweight system monitoring tool. It helps you monitor a single machine and gives you a wealth of metrics. It also has a built-in HTTP server to view graphs and a reporting mechanism of all metrics.
|
||||
|
||||
#### 44. vmstat ####
|
||||
|
||||
|
||||
|
||||
vmstat or virtual memory statistics is a small built-in tool that monitors and displays a summary about the memory in the machine.
|
||||
|
||||
#### 45. uptime ####
|
||||
|
||||
This small command that quickly gives you information about how long the machine has been running, how many users currently are logged on and the system load average for the past 1, 5 and 15 minutes.
|
||||
|
||||
#### 46. mpstat ####
|
||||
|
||||
|
||||
|
||||
mpstat is a built-in tool that monitors cpu usage. The most common command is using `mpstat -P ALL` which gives you the usage of all the cores. You can also get an interval update of the CPU usage.
|
||||
|
||||
#### 47. pmap ####
|
||||
|
||||
|
||||
|
||||
pmap is a built-in tool that reports the memory map of a process. You can use this command to find out causes of memory bottlenecks.
|
||||
|
||||
#### 48. ps ####
|
||||
|
||||
|
||||
|
||||
The ps command will give you an overview of all the current processes. You can easily select all processes using the command `ps -A`
|
||||
|
||||
#### 49. [sar][39] ####
|
||||
|
||||
|
||||
|
||||
sar is a part of the sysstat package and helps you to collect, report and save different system metrics. With different commands it will give you CPU, memory and I/O usage among other things.
|
||||
|
||||
#### 50. [collectl][40] ####
|
||||
|
||||
|
||||
|
||||
Similar to sar collectl collects performance metrics for your machine. By default it shows cpu, network and disk stats but it collects a lot more. The difference to sar is collectl is able to deal with times below 1 second, it can be fed into a plotting tool directly and collectl monitors processes more extensively.
|
||||
|
||||
#### 51. [iostat][41] ####
|
||||
|
||||
|
||||
|
||||
iostat is also part of the sysstat package. This command is used for monitoring system input/output. The reports themselves can be used to change system configurations to better balance input/output load between hard drives in your machine.
|
||||
|
||||
#### 52. free ####
|
||||
|
||||
|
||||
|
||||
This is a built-in command that displays the total amount of free and used physical memory on your machine. It also displays the buffers used by the kernel at that given moment.
|
||||
|
||||
#### 53. /Proc file system ####
|
||||
|
||||
|
||||
|
||||
The proc file system gives you a peek into kernel statistics. From these statistics you can get detailed information about the different hardware devices on your machine. Take a look at the [full list of the proc file statistics][42]
|
||||
|
||||
#### 54. [GKrellM][43] ####
|
||||
|
||||
GKrellm is a gui application that monitor the status of your hardware such CPU, main memory, hard disks, network interfaces and many other things. It can also monitor and launch a mail reader of your choice.
|
||||
|
||||
#### 55. [Gnome system monitor][44] ####
|
||||
|
||||
|
||||
|
||||
Gnome system monitor is a basic system monitoring tool that has features looking at process dependencies from a tree view, kill or renice processes and graphs of all server metrics.
|
||||
|
||||
### Log monitoring tools ###
|
||||
|
||||
#### 56. [GoAccess][45] ####
|
||||
|
||||
|
||||
|
||||
GoAccess is a real-time web log analyzer which analyzes the access log from either apache, nginx or amazon cloudfront. It’s also possible to output the data into HTML, JSON or CSV. It will give you general statistics, top visitors, 404s, geolocation and many other things.
|
||||
|
||||
#### 57. [Logwatch][46] ####
|
||||
|
||||
Logwatch is a log analysis system. It parses through your system’s logs and creates a report analyzing the areas that you specify. It can give you daily reports with short digests of the activities taking place on your machine.
|
||||
|
||||
#### 58. [Swatch][47] ####
|
||||
|
||||
|
||||
|
||||
Much like Logwatch Swatch also monitors your logs, but instead of giving reports it watches for regular expression and notifies you via mail or the console when there is a match. It could be used for intruder detection for example.
|
||||
|
||||
#### 59. [MultiTail][48] ####
|
||||
|
||||
|
||||
|
||||
MultiTail helps you monitor logfiles in multiple windows. You can merge two or more of these logfiles into one. It will also use colors to display the logfiles for easier reading with the help of regular expressions.
|
||||
|
||||
#### System tools ####
|
||||
|
||||
#### 60. [acct or psacct][49] ####
|
||||
|
||||
acct or psacct (depending on if you use apt-get or yum) allows you to monitor all the commands a users executes inside the system including CPU and memory time. Once installed you get that summary with the command ‘sa’.
|
||||
|
||||
#### 61. [whowatch][50] ####
|
||||
|
||||
Similar to acct this tool monitors users on your system and allows you to see in real time what commands and processes they are using. It gives you a tree structure of all the processes and so you can see exactly what’s happening.
|
||||
|
||||
#### 62. [strace][51] ####
|
||||
|
||||
|
||||
|
||||
strace is used to diagnose, debug and monitor interactions between processes. The most common thing to do is making strace print a list of system calls made by the program which is useful if the program does not behave as expected.
|
||||
|
||||
#### 63. [DTrace][52] ####
|
||||
|
||||
|
||||
|
||||
DTrace is the big brother of strace. It dynamically patches live running instructions with instrumentation code. This allows you to do in-depth performance analysis and troubleshooting. However, it’s not for the weak of heart as there is a 1200 book written on the topic.
|
||||
|
||||
#### 64. [webmin][53] ####
|
||||
|
||||
|
||||
|
||||
Webmin is a web-based system administration tool. It removes the need to manually edit unix configuration files and lets you manage the system remotely if need be. It has a couple of monitoring modules that you can attach to it.
|
||||
|
||||
#### 65. stat ####
|
||||
|
||||
|
||||
|
||||
Stat is a built-in tool for displaying status information of files and file systems. It will give you information such as when the file was modified, accessed or changed.
|
||||
|
||||
#### 66. ifconfig ####
|
||||
|
||||
|
||||
|
||||
ifconfig is a built-in tool used to configure the network interfaces. Behind the scenes network monitor tools use ifconfig to set it into promiscuous mode to capture all packets. You can do it yourself with `ifconfig eth0 promisc` and return to normal mode with `ifconfig eth0 -promisc`.
|
||||
|
||||
#### 67. [ulimit][54] ####
|
||||
|
||||
|
||||
|
||||
ulimit is a built-in tool that monitors system resources and keeps a limit so any of the monitored resources don’t go overboard. For instance making a fork bomb where a properly configured ulimit is in place would be totally fine.
|
||||
|
||||
#### 68. [cpulimit][55] ####
|
||||
|
||||
CPUlimit is a small tool that monitors and then limits the CPU usage of a process. It’s particularly useful to make batch jobs not eat up too many CPU cycles.
|
||||
|
||||
#### 69. lshw ####
|
||||
|
||||
|
||||
|
||||
lshw is a small built-in tool extract detailed information about the hardware configuration of the machine. It can output everything from CPU version and speed to mainboard configuration.
|
||||
|
||||
#### 70. w ####
|
||||
|
||||
W is a built-in command that displays information about the users currently using the machine and their processes.
|
||||
|
||||
#### 71. lsof ####
|
||||
|
||||
|
||||
|
||||
lsof is a built-in tool that gives you a list of all open files and network connections. From there you can narrow it down to files opened by processes, based on the process name, by a specific user or perhaps kill all processes that belongs to a specific user.
|
||||
|
||||
### Infrastructure monitoring tools ###
|
||||
|
||||
#### 72. Server Density ####
|
||||
|
||||
|
||||
|
||||
Our [server monitoring tool][56]! It has a web interface that allows you to set alerts and view graphs for all system and network metrics. You can also set up monitoring of websites whether they are up or down. Server Density allows you to set permissions for users and you can extend your monitoring with our plugin infrastructure or api. The service already supports Nagios plugins.
|
||||
|
||||
#### 73. [OpenNMS][57] ####
|
||||
|
||||
|
||||
|
||||
OpenNMS has four main functional areas: event management and notifications; discovery and provisioning; service monitoring and data collection. It’s designed to be customizable to work in a variety of network environments.
|
||||
|
||||
#### 74. [SysUsage][58] ####
|
||||
|
||||
|
||||
|
||||
SysUsage monitors your system continuously via Sar and other system commands. It also allows notifications to alarm you once a threshold is reached. SysUsage itself can be run from a centralized place where all the collected statistics are also being stored. It has a web interface where you can view all the stats.
|
||||
|
||||
#### 75. [brainypdm][59] ####
|
||||
|
||||
|
||||
|
||||
brainypdm is a data management and monitoring tool that has the capability to gather data from nagios or another generic source to make graphs. It’s cross-platform, has custom graphs and is web based.
|
||||
|
||||
#### 76. [PCP][60] ####
|
||||
|
||||
|
||||
|
||||
PCP has the capability of collating metrics from multiple hosts and does so efficiently. It also has a plugin framework so you can make it collect specific metrics that is important to you. You can access graph data through either a web interface or a GUI. Good for monitoring large systems.
|
||||
|
||||
#### 77. [KDE system guard][61] ####
|
||||
|
||||
|
||||
|
||||
This tool is both a system monitor and task manager. You can view server metrics from several machines through the worksheet and if a process needs to be killed or if you need to start a process it can be done within KDE system guard.
|
||||
|
||||
#### 78. [Munin][62] ####
|
||||
|
||||
|
||||
|
||||
Munin is both a network and a system monitoring tool which offers alerts for when metrics go beyond a given threshold. It uses RRDtool to create the graphs and it has web interface to display these graphs. Its emphasis is on plug and play capabilities with a number of plugins available.
|
||||
|
||||
#### 79. [Nagios][63] ####
|
||||
|
||||
|
||||
|
||||
Nagios is system and network monitoring tool that helps you monitor monitor your many servers. It has support for alerting for when things go wrong. It also has many plugins written for the platform.
|
||||
|
||||
#### 80. [Zenoss][64] ####
|
||||
|
||||
|
||||
|
||||
Zenoss provides a web interface that allows you to monitor all system and network metrics. Moreover it discovers network resources and changes in network configurations. It has alerts for you to take action on and it supports the Nagios plugins.
|
||||
|
||||
#### 81. [Cacti][65] ####
|
||||
|
||||
|
||||
|
||||
(And one for luck!) Cacti is network graphing solution that uses the RRDtool data storage. It allows a user to poll services at predetermined intervals and graph the result. Cacti can be extended to monitor a source of your choice through shell scripts.
|
||||
|
||||
#### 82. [Zabbix][66] ####
|
||||
|
||||
|
||||
|
||||
Zabbix is an open source infrastructure monitoring solution. It can use most databases out there to store the monitoring statistics. The Core is written in C and has a frontend in PHP. If you don’t like installing an agent, Zabbix might be an option for you.
|
||||
|
||||
### Bonus section: ###
|
||||
|
||||
Thanks for your suggestions. It’s an oversight on our part that we’ll have to go back trough and renumber all the headings. In light of that, here’s a short section at the end for some of the Linux monitoring tools recommended by you:
|
||||
|
||||
#### 83. [collectd][67] ####
|
||||
|
||||
Collectd is a Unix daemon that collects all your monitoring statistics. It uses a modular design and plugins to fill in any niche monitoring. This way collectd stays as lightweight and customizable as possible.
|
||||
|
||||
#### 84. [Observium][68] ####
|
||||
|
||||
Observium is an auto-discovering network monitoring platform supporting a wide range of hardware platforms and operating systems. Observium focuses on providing a beautiful and powerful yet simple and intuitive interface to the health and status of your network.
|
||||
|
||||
#### 85. Nload ####
|
||||
|
||||
It’s a command line tool that monitors network throughput. It’s neat because it visualizes the in and and outgoing traffic using two graphs and some additional useful data like total amount of transferred data. You can install it with
|
||||
|
||||
yum install nload
|
||||
|
||||
or
|
||||
|
||||
sudo apt-get install nload
|
||||
|
||||
#### 84. [SmokePing][69] ####
|
||||
|
||||
SmokePing keeps track of the network latencies of your network and it visualises them too. There are a wide range of latency measurement plugins developed for SmokePing. If a GUI is important to you it’s there is an ongoing development to make that happen.
|
||||
|
||||
#### 85. [MobaXterm][70] ####
|
||||
|
||||
If you’re working in windows environment day in and day out. You may feel limited by the terminal Windows provides. MobaXterm comes to the rescue and allows you to use many of the terminal commands commonly found in Linux. Which will help you tremendously in your monitoring needs!
|
||||
|
||||
#### 86. [Shinken monitoring][71] ####
|
||||
|
||||
Shinken is a monitoring framework which is a total rewrite of Nagios in python. It aims to enhance flexibility and managing a large environment. While still keeping all your nagios configuration and plugins.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://blog.serverdensity.com/80-linux-monitoring-tools-know/
|
||||
|
||||
作者：[Jonathan Sundqvist][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
|
||||
[a]:https://www.serverdensity.com/
|
||||
[1]:http://hisham.hm/htop/
|
||||
[2]:http://www.atoptool.nl/
|
||||
[3]:https://github.com/JeremyJones/Apachetop
|
||||
[4]:http://www.proftpd.org/docs/howto/Scoreboard.html
|
||||
[5]:http://jeremy.zawodny.com/mysql/mytop/
|
||||
[6]:https://01.org/powertop
|
||||
[7]:http://guichaz.free.fr/iotop/
|
||||
[8]:http://www.ntop.org/products/ntop/
|
||||
[9]:http://www.ex-parrot.com/pdw/iftop/
|
||||
[10]:http://jnettop.kubs.info/wiki/
|
||||
[11]:http://bandwidthd.sourceforge.net/
|
||||
[12]:http://etherape.sourceforge.net/
|
||||
[13]:https://www.kernel.org/pub/software/network/ethtool/
|
||||
[14]:http://nethogs.sourceforge.net/
|
||||
[15]:http://iptraf.seul.org/
|
||||
[16]:http://ngrep.sourceforge.net/
|
||||
[17]:http://oss.oetiker.ch/mrtg/
|
||||
[18]:https://github.com/tgraf/bmon/
|
||||
[19]:http://www.phildev.net/iptstate/index.shtml
|
||||
[20]:https://unix4lyfe.org/darkstat/
|
||||
[21]:http://humdi.net/vnstat/
|
||||
[22]:http://nmap.org/
|
||||
[23]:http://www.bitwizard.nl/mtr/
|
||||
[24]:http://www.tcpdump.org/
|
||||
[25]:http://justniffer.sourceforge.net/
|
||||
[26]:http://nmon.sourceforge.net/pmwiki.php
|
||||
[27]:http://conky.sourceforge.net/
|
||||
[28]:https://github.com/nicolargo/glances
|
||||
[29]:https://packages.debian.org/sid/utils/saidar
|
||||
[30]:http://oss.oetiker.ch/rrdtool/
|
||||
[31]:http://mmonit.com/monit
|
||||
[32]:http://sourceforge.net/projects/procexp/
|
||||
[33]:http://packages.ubuntu.com/lucid/utils/discus
|
||||
[34]:http://www.pogo.org.uk/~mark/xosview/
|
||||
[35]:http://dag.wiee.rs/home-made/dstat/
|
||||
[36]:http://www.net-snmp.org/
|
||||
[37]:http://inotify.aiken.cz/?section=incron&page=about&lang=en
|
||||
[38]:http://www.monitorix.org/
|
||||
[39]:http://sebastien.godard.pagesperso-orange.fr/
|
||||
[40]:http://collectl.sourceforge.net/
|
||||
[41]:http://sebastien.godard.pagesperso-orange.fr/
|
||||
[42]:http://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/proc.html
|
||||
[43]:http://members.dslextreme.com/users/billw/gkrellm/gkrellm.html
|
||||
[44]:http://freecode.com/projects/gnome-system-monitor
|
||||
[45]:http://goaccess.io/
|
||||
[46]:http://sourceforge.net/projects/logwatch/
|
||||
[47]:http://sourceforge.net/projects/swatch/
|
||||
[48]:http://www.vanheusden.com/multitail/
|
||||
[49]:http://www.gnu.org/software/acct/
|
||||
[50]:http://whowatch.sourceforge.net/
|
||||
[51]:http://sourceforge.net/projects/strace/
|
||||
[52]:http://dtrace.org/blogs/about/
|
||||
[53]:http://www.webmin.com/
|
||||
[54]:http://ss64.com/bash/ulimit.html
|
||||
[55]:https://github.com/opsengine/cpulimit
|
||||
[56]:https://www.serverdensity.com/server-monitoring/
|
||||
[57]:http://www.opennms.org/
|
||||
[58]:http://sysusage.darold.net/
|
||||
[59]:http://sourceforge.net/projects/brainypdm/
|
||||
[60]:http://www.pcp.io/
|
||||
[61]:https://userbase.kde.org/KSysGuard
|
||||
[62]:http://munin-monitoring.org/
|
||||
[63]:http://www.nagios.org/
|
||||
[64]:http://www.zenoss.com/
|
||||
[65]:http://www.cacti.net/
|
||||
[66]:http://www.zabbix.com/
|
||||
[67]:https://collectd.org/
|
||||
[68]:http://www.observium.org/
|
||||
[69]:http://oss.oetiker.ch/smokeping/
|
||||
[70]:http://mobaxterm.mobatek.net/
|
||||
[71]:http://www.shinken-monitoring.org/
|
||||
@ -1,3 +1,4 @@
|
||||
Translating by ZTinoZ
|
||||
7 ways hackers can use Wi-Fi against you
|
||||
================================================================================
|
||||
|
||||
@ -66,4 +67,4 @@ via: http://www.networkworld.com/article/3003170/mobile-security/7-ways-hackers-
|
||||
[3]:http://news.yahoo.com/blogs/upgrade-your-life/banking-online-not-hacked-182159934.html
|
||||
[4]:http://pocketnow.com/2014/10/15/should-you-leave-your-smartphones-wifi-on-or-turn-it-off
|
||||
[5]:http://www.cnet.com/news/chrome-becoming-tool-in-googles-push-for-encrypted-web/
|
||||
[6]:https://twitter.com/JoshAlthuser
|
||||
[6]:https://twitter.com/JoshAlthuser
|
||||
|
||||
@ -0,0 +1,64 @@
|
||||
eSpeak: Text To Speech Tool For Linux
|
||||
================================================================================
|
||||
|
||||
|
||||
[eSpeak][1] is a command line tool for Linux that converts text to speech. This is a compact speech synthesizer that provides support to English and many other languages. It is written in C.
|
||||
|
||||
eSpeak reads the text from the standard input or the input file. The voice generated, however, is nowhere close to a human voice. But it is still a compact and handy tool if you want to use it in your projects.
|
||||
|
||||
Some of the main features of eSpeak are:
|
||||
|
||||
- A command line tool for Linux and Windows
|
||||
- Speaks text from a file or from stdin
|
||||
- Shared library version for use by other programs
|
||||
- SAPI5 version for Windows, so it can be used with screen-readers and other programs that support the Windows SAPI5 interface.
|
||||
- Ported to other platforms, including Android, Mac OSX etc.
|
||||
- Several voice characteristics to choose from
|
||||
- speech output can be saved as [.WAV file][2]
|
||||
- SSML ([Speech Synthesis Markup Language][3]) is supported partially along with HTML
|
||||
- Tiny in size, the complete program with language support etc is under 2 MB.
|
||||
- Can translate text into phoneme codes, so it could be adapted as a front end for another speech synthesis engine.
|
||||
- Development tools available for producing and tuning phoneme data.
|
||||
|
||||
### Install eSpeak ###
|
||||
|
||||
To install eSpeak in Ubuntu based system, use the command below in a terminal:
|
||||
|
||||
sudo apt-get install espeak
|
||||
|
||||
eSpeak is an old tool and I presume that it should be available in the repositories of other Linux distributions such as Arch Linux, Fedora etc. You can install eSpeak easily using dnf, pacman etc.
|
||||
|
||||
To use eSpeak, just use it like: espeak and press enter to hear it aloud. Use Ctrl+C to close the running program.
|
||||
|
||||
|
||||
|
||||
There are several other options available. You can browse through them through the help section of the program.
|
||||
|
||||
### GUI version: Gespeaker ###
|
||||
|
||||
If you prefer the GUI version over the command line, you can install Gespeaker that provides a GTK front end to eSpeak.
|
||||
|
||||
Use the command below to install Gespeaker:
|
||||
|
||||
sudo apt-get install gespeaker
|
||||
|
||||
The interface is straightforward and easy to use. You can explore it all by yourself.
|
||||
|
||||
|
||||
|
||||
While such tools might not be useful for general computing need, it could be handy if you are working on some projects where text to speech conversion is required. I let you decide the usage of this speech synthesizer.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://itsfoss.com/espeak-text-speech-linux/
|
||||
|
||||
作者：[Abhishek][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://itsfoss.com/author/abhishek/
|
||||
[1]:http://espeak.sourceforge.net/
|
||||
[2]:http://en.wikipedia.org/wiki/WAV
|
||||
[3]:http://en.wikipedia.org/wiki/Speech_Synthesis_Markup_Language
|
||||
65
sources/share/20151204 Review EXT4 vs. Btrfs vs. XFS.md
Normal file
65
sources/share/20151204 Review EXT4 vs. Btrfs vs. XFS.md
Normal file
@ -0,0 +1,65 @@
|
||||
Review EXT4 vs. Btrfs vs. XFS
|
||||
================================================================================
|
||||
|
||||
|
||||
To be honest, one of the things that comes last in people’s thinking is to look at which file system on their PC is being used. Windows users as well as Mac OS X users even have less reason for looking as they have really only 1 choice for their operating system which are NTFS and HFS+. Linux operating system, on the other side, has plenty of various file system options, with the current default is being widely used ext4. However, there is another push for changing the file system to something other which is called btrfs. But what makes btrfs better, what are other file systems, and when can we see the distributions making the change?
|
||||
|
||||
Let’s first have a general look at file systems and what they really do, then we will make a small comparison between famous file systems.
|
||||
|
||||
### So, What Do File Systems Do? ###
|
||||
|
||||
Just in case if you are unfamiliar about what file systems really do, it is actually simple when it is summarized. The file systems are mainly used in order for controlling how the data is stored after any program is no longer using it, how access to the data is controlled, what other information (metadata) is attached to the data itself, etc. I know that it does not sound like an easy thing to be programmed, and it is definitely not. The file systems are continually still being revised for including more functionality while becoming more efficient in what it simply needs to do. Therefore, however, it is a basic need for all computers, it is not quite as basic as it sounds like.
|
||||
|
||||
### Why Partitioning? ###
|
||||
|
||||
Many people have a vague knowledge of what the partitions are since each operating system has an ability for creating or removing them. It can seem strange that Linux operating system uses more than 1 partition on the same disk, even while using the standard installation procedure, so few explanations are called for them. One of the main goals of having different partitions is achieving higher data security in the disaster case.
|
||||
|
||||
By dividing your hard disk into partitions, the data may be grouped and also separated. When the accidents occur, only the data stored in the partition which got the hit will only be damaged, while data on the other partitions will survive most likely. These principles date from the days when the Linux operating system didn’t have a journaled file system and any power failure might have led to a disaster.
|
||||
|
||||
The using of partitions will remain for security and the robustness reasons, then the breach on 1 part of the operating system does not automatically mean that whole computer is under risk or danger. This is currently most important factor for the partitioning process. For example, the users create scripts, the programs or web applications which start filling up the disk. If that disk contains only 1 big partition, then entire system may stop functioning if that disk is full. If the users store data on separate partitions, then only that data partition can be affected, while system partitions and the possible other data partitions will keep functioning.
|
||||
|
||||
Mind that to have a journaled file system will only provide data security in case if there is a power failure as well as sudden disconnection of the storage devices. Such will not protect the data against the bad blocks and the logical errors in the file system. In such cases, the user should use a Redundant Array of Inexpensive Disks (RAID) solution.
|
||||
|
||||
### Why Switch File Systems? ###
|
||||
|
||||
The ext4 file system has been an improvement for the ext3 file system that was also an improvement over the ext2 file system. While the ext4 is a very solid file system which has been the default choice for almost all distributions for the past few years, it is made from an aging code base. Additionally, Linux operating system users are seeking many new different features in file systems which ext4 does not handle on its own. There is software which takes care of some of such needs, but in the performance aspect, being able to do such things on the file system level could be faster.
|
||||
|
||||
### Ext4 File System ###
|
||||
|
||||
The ext4 has some limits which are still a bit impressive. The maximum file size is 16 tebibytes (which is roughly 17.6 terabytes) and is much bigger than any hard drive a regular consumer can currently buy. While, the largest volume/partition you can make with ext4 is 1 exbibyte (which is roughly 1,152,921.5 terabytes). The ext4 is known to bring the speed improvements over ext3 by using multiple various techniques. Like in the most modern file systems, it is a journaling file system that means that it will keep a journal of where the files are mainly located on the disk and of any other changes that happen to the disk. Regardless all of its features, it doesn’t support the transparent compression, the data deduplication, or the transparent encryption. The snapshots are supported technically, but such feature is experimental at best.
|
||||
|
||||
### Btrfs File System ###
|
||||
|
||||
The btrfs, many of us pronounce it different ways, as an example, Better FS, Butter FS, or B-Tree FS. It is a file system which is completely made from scratch. The btrfs exists because its developers firstly wanted to expand the file system functionality in order to include snapshots, pooling, as well as checksums among the other things. While it is independent from the ext4, it also wants to build off the ideas present in the ext4 that are great for the consumers and the businesses alike as well as incorporate those additional features that will benefit everybody, but specifically the enterprises. For the enterprises who are using very large programs with very large databases, they are having a seemingly continuous file system across the multiple hard drives could be very beneficial as it will make a consolidation of the data much easier. The data deduplication could reduce the amount of the actual space data could occupy, and the data mirroring could become easier with the btrfs as well when there is a single and broad file system which needs to be mirrored.
|
||||
|
||||
The user certainly can still choose to create multiple partitions so that he does not need to mirror everything. Considering that the btrfs will be able for spanning over the multiple hard drives, it is a very good thing that it can support 16 times more drive space than the ext4. A maximum partition size of the btrfs file system is 16 exbibytes, as well as maximum file size is 16 exbibytes too.
|
||||
|
||||
### XFS File System ###
|
||||
|
||||
The XFS file system is an extension of the extent file system. The XFS is a high-performance 64-bit journaling file system. The support of the XFS was merged into Linux kernel in around 2002 and In 2009 Red Hat Enterprise Linux version 5.4 usage of the XFS file system. XFS supports maximum file system size of 8 exbibytes for the 64-bit file system. There is some comparison of XFS file system is XFS file system can’t be shrunk and poor performance with deletions of the large numbers of files. Now, the RHEL 7.0 uses XFS as the default filesystem.
|
||||
|
||||
### Final Thoughts ###
|
||||
|
||||
Unfortunately, the arrival date for the btrfs is not quite known. But officially, the next-generation file system is still classified as “unstable”, but if the user downloads the latest version of Ubuntu, he will be able to choose to install on a btrfs partition. When the btrfs will be classified actually as “stable” is still a mystery, but users shouldn’t expect the Ubuntu to use the btrfs by default until it’s indeed considered “stable”. It has been reported that Fedora 18 will use the btrfs as its default file system as by the time of its release a file system checker for the btrfs should exist. There is a good amount of work still left for the btrfs, as not all the features are yet implemented and the performance is a little sluggish if we compare it to the ext4.
|
||||
|
||||
So, which is better to use? Till now, the ext4 will be the winner despite the identical performance. But why? The answer will be the convenience as well as the ubiquity. The ext4 is still excellent file system for the desktop or workstation use. It is provided by default, so the user can install the operating system on it. Also, the ext4 supports volumes up to 1 Exabyte and files up to 16 Terabyte in size, so there’s still a plenty of room for the growth where space is concerned.
|
||||
|
||||
The btrfs might offer greater volumes up to 16 Exabyte and improved fault tolerance, but, till now, it feels more as an add-on file system rather than one integrated into the Linux operating system. For example, the btrfs-tools have to be present before a drive will be formatted with the btrfs, which means that the btrfs is not an option during the Linux operating system installation though that could vary with the distribution.
|
||||
|
||||
Even though the transfer rates are so important, there’s more to a just file system than speed of the file transfers. The btrfs has many useful features such as Copy-on-Write (CoW), extensive checksums, snapshots, scrubbing, self-healing data, deduplication, as well as many more good improvements that ensure the data integrity. The btrfs lacks the RAID-Z features of ZFS, so the RAID is still in an experimental state with the btrfs. For pure data storage, however, the btrfs is the winner over the ext4, but time still will tell.
|
||||
|
||||
Till the moment, the ext4 seems to be a better choice on the desktop system since it is presented as a default file system, as well as it is faster than the btrfs when transferring files. The btrfs is definitely worth to look into, but to completely switch to replace the ext4 on desktop Linux might be few years later. The data farms and the large storage pools could reveal different stories and show the right differences between ext4, XCF, and btrfs.
|
||||
|
||||
If you have a different or additional opinion, kindly let us know by commenting on this article.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.unixmen.com/review-ext4-vs-btrfs-vs-xfs/
|
||||
|
||||
作者：[M.el Khamlichi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.unixmen.com/author/pirat9/
|
||||
@ -1,147 +0,0 @@
|
||||
Why did you start using Linux?
|
||||
================================================================================
|
||||
> In today's open source roundup: What got you started with Linux? Plus: IBM's Linux only Mainframe. And why you should skip Windows 10 and go with Linux
|
||||
|
||||
### Why did you start using Linux? ###
|
||||
|
||||
Linux has become quite popular over the years, with many users defecting to it from OS X or Windows. But have you ever wondered what got people started with Linux? A redditor asked that question and got some very interesting answers.
|
||||
|
||||
SilverKnight asked his question on the Linux subreddit:
|
||||
|
||||
> I know this has been asked before, but I wanted to hear more from the younger generation why it is that they started using linux and what keeps them here.
|
||||
>
|
||||
> I dont want to discourage others from giving their linux origin stories, because those are usually pretty good, but I was mostly curious about our younger population since there isn't much out there from them yet.
|
||||
>
|
||||
> I myself am 27 and am a linux dabbler. I have installed quite a few different distros over the years but I haven't made the plunge to full time linux. I guess I am looking for some more reasons/inspiration to jump on the bandwagon.
|
||||
>
|
||||
> [More at Reddit][1]
|
||||
|
||||
Fellow redditors in the Linux subreddit responded with their thoughts:
|
||||
|
||||
> **DoublePlusGood**: "I started using Backtrack Linux (now Kali) at 12 because I wanted to be a "1337 haxor". I've stayed with Linux (Archlinux currently) because it lets me have the endless freedom to make my computer do what I want."
|
||||
>
|
||||
> **Zack**: "I'm a Linux user since, I think, the age of 12 or 13, I'm 15 now.
|
||||
>
|
||||
> It started when I got tired with Windows XP at 11 and the waiting, dammit am I impatient sometimes, but waiting for a basic task such as shutting down just made me tired of Windows all together.
|
||||
>
|
||||
> A few months previously I had started participating in discussions in a channel on the freenode IRC network which was about a game, and as freenode usually goes, it was open source and most of the users used Linux.
|
||||
>
|
||||
> I kept on hearing about this Linux but wasn't that interested in it at the time. However, because the channel (and most of freenode) involved quite a bit of programming I started learning Python.
|
||||
>
|
||||
> A year passed and I was attempting to install GNU/Linux (specifically Ubuntu) on my new (technically old, but I had just got it for my birthday) PC, unfortunately it continually froze, for reasons unknown (probably a bad hard drive, or a lot of dust or something else...).
|
||||
>
|
||||
> Back then I was the type to give up on things, so I just continually nagged my dad to try and install Ubuntu, he couldn't do it for the same reasons.
|
||||
>
|
||||
> After wanting Linux for a while I became determined to get Linux and ditch windows for good. So instead of Ubuntu I tried Linux Mint, being a derivative of Ubuntu(?) I didn't have high hopes, but it worked!
|
||||
>
|
||||
> I continued using it for another 6 months.
|
||||
>
|
||||
> During that time a friend on IRC gave me a virtual machine (which ran Ubuntu) on their server, I kept it for a year a bit until my dad got me my own server.
|
||||
>
|
||||
> After the 6 months I got a new PC (which I still use!) I wanted to try something different.
|
||||
>
|
||||
> I decided to install openSUSE.
|
||||
>
|
||||
> I liked it a lot, and on the same Christmas I obtained a Raspberry Pi, and stuck with Debian on it for a while due to the lack of support other distros had for it."
|
||||
>
|
||||
> **Cqz**: "Was about 9 when the Windows 98 machine handed down to me stopped working for reasons unknown. We had no Windows install disk, but Dad had one of those magazines that comes with demo programs and stuff on CDs. This one happened to have install media for Mandrake Linux, and so suddenly I was a Linux user. Had no idea what I was doing but had a lot of fun doing it, and although in following years I often dual booted with various Windows versions, the FLOSS world always felt like home. Currently only have one Windows installation, which is a virtual machine for games."
|
||||
>
|
||||
> **Tosmarcel**: "I was 15 and was really curious about this new concept called 'programming' and then I stumbled upon this Harvard course, CS50. They told users to install a Linux vm to use the command line. But then I asked myself: "Why doesn't windows have this command line?!". I googled 'linux' and Ubuntu was the top result -Ended up installing Ubuntu and deleted the windows partition accidentally... It was really hard to adapt because I knew nothing about linux. Now I'm 16 and running arch linux, never looked back and I love it!"
|
||||
>
|
||||
> **Micioonthet**: "First heard about Linux in the 5th grade when I went over to a friend's house and his laptop was running MEPIS (an old fork of Debian) instead of Windows XP.
|
||||
>
|
||||
> Turns out his dad was a socialist (in America) and their family didn't trust Microsoft. This was completely foreign to me, and I was confused as to why he would bother using an operating system that didn't support the majority of software that I knew.
|
||||
>
|
||||
> Fast forward to when I was 13 and without a laptop. Another friend of mine was complaining about how slow his laptop was, so I offered to buy it off of him so I could fix it up and use it for myself. I paid $20 and got a virus filled, unusable HP Pavilion with Windows Vista. Instead of trying to clean up the disgusting Windows install, I remembered that Linux was a thing and that it was free. I burned an Ubuntu 12.04 disc and installed it right away, and was absolutely astonished by the performance.
|
||||
>
|
||||
> Minecraft (one of the few early Linux games because it ran on Java), which could barely run at 5 FPS on Vista, ran at an entirely playable 25 FPS on a clean install of Ubuntu.
|
||||
>
|
||||
> I actually still have that old laptop and use it occasionally, because why not? Linux doesn't care how old your hardware is.
|
||||
>
|
||||
> I since converted my dad to Linux and we buy old computers at lawn sales and thrift stores for pennies and throw Linux Mint or some other lightweight distros on them."
|
||||
>
|
||||
> **Webtm**: "My dad had every computer in the house with some distribution on it, I think a couple with OpenSUSE and Debian, and his personal computer had Slackware on it. So I remember being little and playing around with Debian and not really getting into it much. So I had a Windows laptop for a few years and my dad asked me if I wanted to try out Debian. It was a fun experience and ever since then I've been using Debian and trying out distributions. I currently moved away from Linux and have been using FreeBSD for around 5 months now, and I am absolutely happy with it.
|
||||
>
|
||||
> The control over your system is fantastic. There are a lot of cool open source projects. I guess a lot of the fun was figuring out how to do the things I want by myself and tweaking those things in ways to make them do something else. Stability and performance is also a HUGE plus. Not to mention the level of privacy when switching."
|
||||
>
|
||||
> **Wyronaut**: "I'm currently 18, but I first started using Linux when I was 13. Back then my first distro was Ubuntu. The reason why I wanted to check out Linux, was because I was hosting little Minecraft game servers for myself and a couple of friends, back then Minecraft was pretty new-ish. I read that the defacto operating system for hosting servers was Linux.
|
||||
>
|
||||
> I was a big newbie when it came to command line work, so Linux scared me a little, because I had to take care of a lot of things myself. But thanks to google and a few wiki pages I managed to get up a couple of simple servers running on a few older PC's I had lying around. Great use for all that older hardware no one in the house ever uses.
|
||||
>
|
||||
> After running a few game servers I started running a few web servers as well. Experimenting with HTML, CSS and PHP. I worked with those for a year or two. Afterwards, took a look at Java. I made the terrible mistake of watching TheNewBoston video's.
|
||||
>
|
||||
> So after like a week I gave up on Java and went to pick up a book on Python instead. That book was Learn Python The Hard Way by Zed A. Shaw. After I finished that at the fast pace of two weeks, I picked up the book C++ Primer, because at the time I wanted to become a game developer. Went trough about half of the book (~500 pages) and burned out on learning. At that point I was spending a sickening amount of time behind my computer.
|
||||
>
|
||||
> After taking a bit of a break, I decided to pick up JavaScript. Read like 2 books, made like 4 different platformers and called it a day.
|
||||
>
|
||||
> Now we're arriving at the present. I had to go through the horrendous process of finding a school and deciding what job I wanted to strive for when I graduated. I ruled out anything in the gaming sector as I didn't want anything to do with graphics programming anymore, I also got completely sick of drawing and modelling. And I found this bachelor that had something to do with netsec and I instantly fell in love. I picked up a couple books on C to shred this vacation period and brushed up on some maths and I'm now waiting for the new school year to commence.
|
||||
>
|
||||
> Right now, I am having loads of fun with Arch Linux, made couple of different arrangements on different PC's and it's going great!
|
||||
>
|
||||
> In a sense Linux is what also got me into programming and ultimately into what I'm going to study in college starting this september. I probably have my future life to thank for it."
|
||||
>
|
||||
> **Linuxllc**: "You also can learn from old farts like me.
|
||||
>
|
||||
> The crutch, The crutch, The crutch. Getting rid of the crutch will inspired you and have good reason to stick with Linux.
|
||||
>
|
||||
> I got rid of my crutch(Windows XP) back in 2003. Took me only 5 days to get all my computer task back and running at a 100% workflow. Including all my peripheral devices. Minus any Windows games. I just play native Linux games."
|
||||
>
|
||||
> **Highclass**: "Hey I'm 28 not sure if this is the age group you are looking for.
|
||||
>
|
||||
> To be honest, I was always interested in computers and the thought of a free operating system was intriguing even though at the time I didn't fully grasp the free software philosophy, to me it was free as in no cost. I also did not find the CLI too intimidating as from an early age I had exposure to DOS.
|
||||
>
|
||||
> I believe my first distro was Mandrake, I was 11 or 12, I messed up the family computer on several occasions.... I ended up sticking with it always trying to push myself to the next level. Now I work in the industry with Linux everyday.
|
||||
>
|
||||
> /shrug"
|
||||
>
|
||||
> Matto: "My computer couldn't run fast enough for XP (got it at a garage sale), so I started looking for alternatives. Ubuntu came up in Google. I was maybe 15 or 16 at the time. Now I'm 23 and have a job working on a product that uses Linux internally."
|
||||
>
|
||||
> [More at Reddit][2]
|
||||
|
||||
### IBM's Linux only Mainframe ###
|
||||
|
||||
IBM has a long history with Linux, and now the company has created a Mainframe that features Ubuntu Linux. The new machine is named LinuxOne.
|
||||
|
||||
Ron Miller reports for TechCrunch:
|
||||
|
||||
> The new mainframes come in two flavors, named for penguins (Linux — penguins — get it?). The first is called Emperor and runs on the IBM z13, which we wrote about in January. The other is a smaller mainframe called the Rockhopper designed for a more “entry level” mainframe buyer.
|
||||
>
|
||||
> You may have thought that mainframes went the way of the dinosaur, but they are still alive and well and running in large institutions throughout the world. IBM as part of its broader strategy to promote the cloud, analytics and security is hoping to expand the potential market for mainframes by running Ubuntu Linux and supporting a range of popular open source enterprise software such as Apache Spark, Node.js, MongoDB, MariaDB, PostgreSQL and Chef.
|
||||
>
|
||||
> The metered mainframe will still sit inside the customer’s on-premises data center, but billing will be based on how much the customer uses the system, much like a cloud model, Mauri explained.
|
||||
>
|
||||
> ...IBM is looking for ways to increase those sales. Partnering with Canonical and encouraging use of open source tools on a mainframe gives the company a new way to attract customers to a small, but lucrative market.
|
||||
>
|
||||
> [More at TechCrunch][3]
|
||||
|
||||
### Why you should skip Windows 10 and opt for Linux ###
|
||||
|
||||
Since Windows 10 has been released there has been quite a bit of media coverage about its potential to spy on users. ZDNet has listed some reasons why you should skip Windows 10 and opt for Linux instead on your computer.
|
||||
|
||||
SJVN reports for ZDNet:
|
||||
|
||||
> You can try to turn Windows 10's data-sharing ways off, but, bad news: Windows 10 will keep sharing some of your data with Microsoft anyway. There is an alternative: Desktop Linux.
|
||||
>
|
||||
> You can do a lot to keep Windows 10 from blabbing, but you can't always stop it from talking. Cortana, Windows 10's voice activated assistant, for example, will share some data with Microsoft, even when it's disabled. That data includes a persistent computer ID to identify your PC to Microsoft.
|
||||
>
|
||||
> So, if that gives you a privacy panic attack, you can either stick with your old operating system, which is likely Windows 7, or move to Linux. Eventually, when Windows 7 is no longer supported, if you want privacy you'll have no other viable choice but Linux.
|
||||
>
|
||||
> There are other, more obscure desktop operating systems that are also desktop-based and private. These include the BSD Unix family such as FreeBSD, PCBSD, and NetBSD and eComStation, OS/2 for the 21st century. Your best choice, though, is a desktop-based Linux with a low learning curve.
|
||||
>
|
||||
> [More at ZDNet][4]
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.itworld.com/article/2972587/linux/why-did-you-start-using-linux.html
|
||||
|
||||
作者：[Jim Lynch][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.itworld.com/author/Jim-Lynch/
|
||||
[1]:https://www.reddit.com/r/linux/comments/3hb2sr/question_for_younger_users_why_did_you_start/
|
||||
[2]:https://www.reddit.com/r/linux/comments/3hb2sr/question_for_younger_users_why_did_you_start/
|
||||
[3]:http://techcrunch.com/2015/08/16/ibm-teams-with-canonical-on-linux-mainframe/
|
||||
[4]:http://www.zdnet.com/article/sick-of-windows-spying-on-you-go-linux/
|
||||
@ -1,4 +1,3 @@
|
||||
icybreaker translating...
|
||||
14 tips for teaching open source development
|
||||
================================================================================
|
||||
Academia is an excellent platform for training and preparing the open source developers of tomorrow. In research, we occasionally open source software we write. We do this for two reasons. One, to promote the use of the tools we produce. And two, to learn more about the impact and issues other people face when using them. With this background of writing research software, I was tasked with redesigning the undergraduate software engineering course for second-year students at the University of Bradford.
|
||||
|
||||
@ -1,35 +0,0 @@
|
||||
Linus Torvalds Lambasts Open Source Programmers over Insecure Code
|
||||
================================================================================
|
||||
|
||||
|
||||
Linus Torvalds's latest rant underscores the high expectations the Linux developer places on open source programmers—as well the importance of security for Linux kernel code.
|
||||
|
||||
Torvalds is the unofficial "benevolent dictator" of the Linux kernel project. That means he gets to decide which code contributions go into the kernel, and which ones land in the reject pile.
|
||||
|
||||
On Oct. 28, open source coders whose work did not meet Torvalds's expectations faced an [angry rant][1]. "Christ people," Torvalds wrote about the code. "This is just sh*t."
|
||||
|
||||
He went on to call the coders "just incompetent and out to lunch."
|
||||
|
||||
What made Torvalds so angry? He believed the code could have been written more efficiently. It could have been easier for other programmers to understand and would run better through a compiler, the program that translates human-readable code into the binaries that computers understand.
|
||||
|
||||
Torvalds posted his own substitution for the code in question and suggested that the programmers should have written it his way.
|
||||
|
||||
Torvalds has a history of lashing out against people with whom he disagrees. It stretches back to 1991, when he famously [flamed Andrew Tanenbaum][2]—whose Minix operating system he later described as a series of "brain-damages." No doubt this latest criticism of fellow open source coders will go down as another example of Torvalds's confrontational personality.
|
||||
|
||||
But Torvalds may also have been acting strategically during this latest rant. "I want to make it clear to *everybody* that code like this is completely unacceptable," he wrote, suggesting that his goal was to send a message to all Linux programmers, not just vent his anger at particular ones.
|
||||
|
||||
Torvalds also used the incident as an opportunity to highlight the security concerns that arise from poorly written code. Those are issues dear to open source programmers' hearts in an age when enterprises are finally taking software security seriously, and demanding top-notch performance from their code in this regard. Lambasting open source programmers who write insecure code thus helps Linux's image.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://thevarguy.com/open-source-application-software-companies/110415/linus-torvalds-lambasts-open-source-programmers-over-inse
|
||||
|
||||
作者：[Christopher Tozzi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://thevarguy.com/author/christopher-tozzi
|
||||
[1]:http://lkml.iu.edu/hypermail/linux/kernel/1510.3/02866.html
|
||||
[2]:https://en.wikipedia.org/wiki/Tanenbaum%E2%80%93Torvalds_debate
|
||||
@ -0,0 +1,284 @@
|
||||
Review: 5 memory debuggers for Linux coding
|
||||
================================================================================
|
||||
|
||||
Credit: [Moini][1]
|
||||
|
||||
As a programmer, I'm aware that I tend to make mistakes -- and why not? Even programmers are human. Some errors are detected during code compilation, while others get caught during software testing. However, a category of error exists that usually does not get detected at either of these stages and that may cause the software to behave unexpectedly -- or worse, terminate prematurely.
|
||||
|
||||
If you haven't already guessed it, I am talking about memory-related errors. Manually debugging these errors can be not only time-consuming but difficult to find and correct. Also, it's worth mentioning that these errors are surprisingly common, especially in software written in programming languages like C and C++, which were designed for use with [manual memory management][2].
|
||||
|
||||
Thankfully, several programming tools exist that can help you find memory errors in your software programs. In this roundup, I assess five popular, free and open-source memory debuggers that are available for Linux: Dmalloc, Electric Fence, Memcheck, Memwatch and Mtrace. I've used all five in my day-to-day programming, and so these reviews are based on practical experience.
|
||||
|
||||
eviews are based on practical experience.
|
||||
|
||||
### [Dmalloc][3] ###
|
||||
|
||||
**Developer**: Gray Watson
|
||||
**Reviewed version**: 5.5.2
|
||||
**Linux support**: All flavors
|
||||
**License**: Creative Commons Attribution-Share Alike 3.0 License
|
||||
|
||||
Dmalloc is a memory-debugging tool developed by Gray Watson. It is implemented as a library that provides wrappers around standard memory management functions like **malloc(), calloc(), free()** and more, enabling programmers to detect problematic code.
|
||||
|
||||
|
||||
Dmalloc
|
||||
|
||||
As listed on the tool's Web page, the debugging features it provides includes memory-leak tracking, [double free][4] error tracking and [fence-post write detection][5]. Other features include file/line number reporting, and general logging of statistics.
|
||||
|
||||
#### What's new ####
|
||||
|
||||
Version 5.5.2 is primarily a [bug-fix release][6] containing corrections for a couple of build and install problems.
|
||||
|
||||
#### What's good about it ####
|
||||
|
||||
The best part about Dmalloc is that it's extremely configurable. For example, you can configure it to include support for C++ programs as well as threaded applications. A useful functionality it provides is runtime configurability, which means that you can easily enable/disable the features the tool provides while it is being executed.
|
||||
|
||||
You can also use Dmalloc with the [GNU Project Debugger (GDB)][7] -- just add the contents of the dmalloc.gdb file (located in the contrib subdirectory in Dmalloc's source package) to the .gdbinit file in your home directory.
|
||||
|
||||
Another thing that I really like about Dmalloc is its extensive documentation. Just head to the [documentation section][8] on its official website, and you'll get everything from how to download, install, run and use the library to detailed descriptions of the features it provides and an explanation of the output file it produces. There's also a section containing solutions to some common problems.
|
||||
|
||||
#### Other considerations ####
|
||||
|
||||
Like Mtrace, Dmalloc requires programmers to make changes to their program's source code. In this case you may, at the very least, want to add the **dmalloc.h** header, because it allows the tool to report the file/line numbers of calls that generate problems, something that is very useful as it saves time while debugging.
|
||||
|
||||
In addition, the Dmalloc library, which is produced after the package is compiled, needs to be linked with your program while the program is being compiled.
|
||||
|
||||
However, complicating things somewhat is the fact that you also need to set an environment variable, dubbed **DMALLOC_OPTION**, that the debugging tool uses to configure the memory debugging features -- as well as the location of the output file -- at runtime. While you can manually assign a value to the environment variable, beginners may find that process a bit tough, given that the Dmalloc features you want to enable are listed as part of that value, and are actually represented as a sum of their respective hexadecimal values -- you can read more about it [here][9].
|
||||
|
||||
An easier way to set the environment variable is to use the [Dmalloc Utility Program][10], which was designed for just that purpose.
|
||||
|
||||
#### Bottom line ####
|
||||
|
||||
Dmalloc's real strength lies in the configurability options it provides. It is also highly portable, having being successfully ported to many OSes, including AIX, BSD/OS, DG/UX, Free/Net/OpenBSD, GNU/Hurd, HPUX, Irix, Linux, MS-DOG, NeXT, OSF, SCO, Solaris, SunOS, Ultrix, Unixware and even Unicos (on a Cray T3E). Although the tool has a bit of a learning curve associated with it, the features it provides are worth it.
|
||||
|
||||
### [Electric Fence][15] ###
|
||||
|
||||
**Developer**: Bruce Perens
|
||||
**Reviewed version**: 2.2.3
|
||||
**Linux support**: All flavors
|
||||
**License**: GNU GPL (version 2)
|
||||
|
||||
Electric Fence is a memory-debugging tool developed by Bruce Perens. It is implemented in the form of a library that your program needs to link to, and is capable of detecting overruns of memory allocated on a [heap][11] ) as well as memory accesses that have already been released.
|
||||
|
||||
|
||||
Electric Fence
|
||||
|
||||
As the name suggests, Electric Fence creates a virtual fence around each allocated buffer in a way that any illegal memory access results in a [segmentation fault][12]. The tool supports both C and C++ programs.
|
||||
|
||||
#### What's new ####
|
||||
|
||||
Version 2.2.3 contains a fix for the tool's build system, allowing it to actually pass the -fno-builtin-malloc option to the [GNU Compiler Collection (GCC)][13].
|
||||
|
||||
#### What's good about it ####
|
||||
|
||||
The first thing that I liked about Electric Fence is that -- unlike Memwatch, Dmalloc and Mtrace -- it doesn't require you to make any changes in the source code of your program. You just need to link your program with the tool's library during compilation.
|
||||
|
||||
Secondly, the way the debugging tool is implemented makes sure that a segmentation fault is generated on the very first instruction that causes a bounds violation, which is always better than having the problem detected at a later stage.
|
||||
|
||||
Electric Fence always produces a copyright message in output irrespective of whether an error was detected or not. This behavior is quite useful, as it also acts as a confirmation that you are actually running an Electric Fence-enabled version of your program.
|
||||
|
||||
#### Other considerations ####
|
||||
|
||||
On the other hand, what I really miss in Electric Fence is the ability to detect memory leaks, as it is one of the most common and potentially serious problems that software written in C/C++ has. In addition, the tool cannot detect overruns of memory allocated on the stack, and is not thread-safe.
|
||||
|
||||
Given that the tool allocates an inaccessible virtual memory page both before and after a user-allocated memory buffer, it ends up consuming a lot of extra memory if your program makes too many dynamic memory allocations.
|
||||
|
||||
Another limitation of the tool is that it cannot explicitly tell exactly where the problem lies in your programs' code -- all it does is produce a segmentation fault whenever it detects a memory-related error. To find out the exact line number, you'll have to debug your Electric Fence-enabled program with a tool like [The Gnu Project Debugger (GDB)][14], which in turn depends on the -g compiler option to produce line numbers in output.
|
||||
|
||||
Finally, although Electric Fence is capable of detecting most buffer overruns, an exception is the scenario where the allocated buffer size is not a multiple of the word size of the system -- in that case, an overrun (even if it's only a few bytes) won't be detected.
|
||||
|
||||
#### Bottom line ####
|
||||
|
||||
Despite all its limitations, where Electric Fence scores is the ease of use -- just link your program with the tool once, and it'll alert you every time it detects a memory issue it's capable of detecting. However, as already mentioned, the tool requires you to use a source-code debugger like GDB.
|
||||
|
||||
### [Memcheck][16] ###
|
||||
|
||||
**Developer**: [Valgrind Developers][17]
|
||||
**Reviewed version**: 3.10.1
|
||||
**Linux support**: All flavors
|
||||
**License**: GPL
|
||||
|
||||
[Valgrind][18] is a suite that provides several tools for debugging and profiling Linux programs. Although it works with programs written in many different languages -- such as Java, Perl, Python, Assembly code, Fortran, Ada and more -- the tools it provides are largely aimed at programs written in C and C++.
|
||||
|
||||
The most popular Valgrind tool is Memcheck, a memory-error detector that can detect issues such as memory leaks, invalid memory access, uses of undefined values and problems related to allocation and deallocation of heap memory.
|
||||
|
||||
#### What's new ####
|
||||
|
||||
This [release][19] of the suite (3.10.1) is a minor one that primarily contains fixes to bugs reported in version 3.10.0. In addition, it also "backports fixes for all reported missing AArch64 ARMv8 instructions and syscalls from the trunk."
|
||||
|
||||
#### What's good about it ####
|
||||
|
||||
Memcheck, like all other Valgrind tools, is basically a command line utility. It's very easy to use: If you normally run your program on the command line in a form such as prog arg1 arg2, you just need to add a few values, like this: valgrind --leak-check=full prog arg1 arg2.
|
||||
|
||||
|
||||
Memcheck
|
||||
|
||||
(Note: You don't need to mention Memcheck anywhere in the command line because it's the default Valgrind tool. However, you do need to initially compile your program with the -g option -- which adds debugging information -- so that Memcheck's error messages include exact line numbers.)
|
||||
|
||||
What I really like about Memcheck is that it provides a lot of command line options (such as the --leak-check option mentioned above), allowing you to not only control how the tool works but also how it produces the output.
|
||||
|
||||
For example, you can enable the --track-origins option to see information on the sources of uninitialized data in your program. Enabling the --show-mismatched-frees option will let Memcheck match the memory allocation and deallocation techniques. For code written in C language, Memcheck will make sure that only the free() function is used to deallocate memory allocated by malloc(), while for code written in C++, the tool will check whether or not the delete and delete[] operators are used to deallocate memory allocated by new and new[], respectively. If a mismatch is detected, an error is reported.
|
||||
|
||||
But the best part, especially for beginners, is that the tool even produces suggestions about which command line option the user should use to make the output more meaningful. For example, if you do not use the basic --leak-check option, it will produce an output suggesting: "Rerun with --leak-check=full to see details of leaked memory." And if there are uninitialized variables in the program, the tool will generate a message that says, "Use --track-origins=yes to see where uninitialized values come from."
|
||||
|
||||
Another useful feature of Memcheck is that it lets you [create suppression files][20], allowing you to suppress certain errors that you can't fix at the moment -- this way you won't be reminded of them every time the tool is run. It's worth mentioning that there already exists a default suppression file that Memcheck reads to suppress errors in the system libraries, such as the C library, that come pre-installed with your OS. You can either create a new suppression file for your use, or edit the existing one (usually /usr/lib/valgrind/default.supp).
|
||||
|
||||
For those seeking advanced functionality, it's worth knowing that Memcheck can also [detect memory errors][21] in programs that use [custom memory allocators][22]. In addition, it also provides [monitor commands][23] that can be used while working with Valgrind's built-in gdbserver, as well as a [client request mechanism][24] that allows you not only to tell the tool facts about the behavior of your program, but make queries as well.
|
||||
|
||||
#### Other considerations ####
|
||||
|
||||
While there's no denying that Memcheck can save you a lot of debugging time and frustration, the tool uses a lot of memory, and so can make your program execution significantly slower (around 20 to 30 times, [according to the documentation][25]).
|
||||
|
||||
Aside from this, there are some other limitations, too. According to some user comments, Memcheck apparently isn't [thread-safe][26]; it doesn't detect [static buffer overruns][27]). Also, there are some Linux programs, like [GNU Emacs][28], that currently do not work with Memcheck.
|
||||
|
||||
If you're interested in taking a look, an exhaustive list of Valgrind's limitations can be found [here][29].
|
||||
|
||||
#### Bottom line ####
|
||||
|
||||
Memcheck is a handy memory-debugging tool for both beginners as well as those looking for advanced features. While it's very easy to use if all you need is basic debugging and error checking, there's a bit of learning curve if you want to use features like suppression files or monitor commands.
|
||||
|
||||
Although it has a long list of limitations, Valgrind (and hence Memcheck) claims on its site that it is used by [thousands of programmers][30] across the world -- the team behind the tool says it's received feedback from users in over 30 countries, with some of them working on projects with up to a whopping 25 million lines of code.
|
||||
|
||||
### [Memwatch][31] ###
|
||||
|
||||
**Developer**: Johan Lindh
|
||||
**Reviewed version**: 2.71
|
||||
**Linux support**: All flavors
|
||||
**License**: GNU GPL
|
||||
|
||||
Memwatch is a memory-debugging tool developed by Johan Lindh. Although it's primarily a memory-leak detector, it is also capable (according to its Web page) of detecting other memory-related issues like [double-free error tracking and erroneous frees][32], buffer overflow and underflow, [wild pointer][33] writes, and more.
|
||||
|
||||
The tool works with programs written in C. Although you can also use it with C++ programs, it's not recommended (according to the Q&A file that comes with the tool's source package).
|
||||
|
||||
#### What's new ####
|
||||
|
||||
This version adds ULONG_LONG_MAX to detect whether a program is 32-bit or 64-bit.
|
||||
|
||||
#### What's good about it ####
|
||||
|
||||
Like Dmalloc, Memwatch comes with good documentation. You can refer to the USING file if you want to learn things like how the tool works; how it performs initialization, cleanup and I/O operations; and more. Then there is a FAQ file that is aimed at helping users in case they face any common error while using Memcheck. Finally, there is a test.c file that contains a working example of the tool for your reference.
|
||||
|
||||
|
||||
Memwatch
|
||||
|
||||
Unlike Mtrace, the log file to which Memwatch writes the output (usually memwatch.log) is in human-readable form. Also, instead of truncating, Memwatch appends the memory-debugging output to the file each time the tool is run, allowing you to easily refer to the previous outputs should the need arise.
|
||||
|
||||
It's also worth mentioning that when you execute your program with Memwatch enabled, the tool produces a one-line output on [stdout][34] informing you that some errors were found -- you can then head to the log file for details. If no such error message is produced, you can rest assured that the log file won't contain any mistakes -- this actually saves time if you're running the tool several times.
|
||||
|
||||
Another thing that I liked about Memwatch is that it also provides a way through which you can capture the tool's output from within the code, and handle it the way you like (refer to the mwSetOutFunc() function in the Memwatch source code for more on this).
|
||||
|
||||
#### Other considerations ####
|
||||
|
||||
Like Mtrace and Dmalloc, Memwatch requires you to add extra code to your source file -- you have to include the memwatch.h header file in your code. Also, while compiling your program, you need to either compile memwatch.c along with your program's source files or include the object module from the compile of the file, as well as define the MEMWATCH and MW_STDIO variables on the command line. Needless to say, the -g compiler option is also required for your program if you want exact line numbers in the output.
|
||||
|
||||
There are some features that it doesn't contain. For example, the tool cannot detect attempts to write to an address that has already been freed or read data from outside the allocated memory. Also, it's not thread-safe. Finally, as I've already pointed out in the beginning, there is no guarantee on how the tool will behave if you use it with programs written in C++.
|
||||
|
||||
#### Bottom line ####
|
||||
|
||||
Memcheck can detect many memory-related problems, making it a handy debugging tool when dealing with projects written in C. Given that it has a very small source code, you can learn how the tool works, debug it if the need arises, and even extend or update its functionality as per your requirements.
|
||||
|
||||
### [Mtrace][35] ###
|
||||
|
||||
**Developers**: Roland McGrath and Ulrich Drepper
|
||||
**Reviewed version**: 2.21
|
||||
**Linux support**: All flavors
|
||||
**License**: GNU LGPL
|
||||
|
||||
Mtrace is a memory-debugging tool included in [the GNU C library][36]. It works with both C and C++ programs on Linux, and detects memory leaks caused by unbalanced calls to the malloc() and free() functions.
|
||||
|
||||
|
||||
Mtrace
|
||||
|
||||
The tool is implemented in the form of a function called mtrace(), which traces all malloc/free calls made by a program and logs the information in a user-specified file. Because the file contains data in computer-readable format, a Perl script -- also named mtrace -- is used to convert and display it in human-readable form.
|
||||
|
||||
#### What's new ####
|
||||
|
||||
[The Mtrace source][37] and [the Perl file][38] that now come with the GNU C library (version 2.21) add nothing new to the tool aside from an update to the copyright dates.
|
||||
|
||||
#### What's good about it ####
|
||||
|
||||
The best part about Mtrace is that the learning curve for it isn't steep; all you need to understand is how and where to add the mtrace() -- and the corresponding muntrace() -- function in your code, and how to use the Mtrace Perl script. The latter is very straightforward -- all you have to do is run the mtrace() <program-executable> <log-file-generated-upon-program-execution> command. (For an example, see the last command in the screenshot above.)
|
||||
|
||||
Another thing that I like about Mtrace is that it's scalable -- which means that you can not only use it to debug a complete program, but can also use it to detect memory leaks in individual modules of the program. Just call the mtrace() and muntrace() functions within each module.
|
||||
|
||||
Finally, since the tool is triggered when the mtrace() function -- which you add in your program's source code -- is executed, you have the flexibility to enable the tool dynamically (during program execution) [using signals][39].
|
||||
|
||||
#### Other considerations ####
|
||||
|
||||
Because the calls to mtrace() and mauntrace() functions -- which are declared in the mcheck.h file that you need to include in your program's source -- are fundamental to Mtrace's operation (the mauntrace() function is not [always required][40]), the tool requires programmers to make changes in their code at least once.
|
||||
|
||||
Be aware that you need to compile your program with the -g option (provided by both the [GCC][41] and [G++][42] compilers), which enables the debugging tool to display exact line numbers in the output. In addition, some programs (depending on how big their source code is) can take a long time to compile. Finally, compiling with -g increases the size of the executable (because it produces extra information for debugging), so you have to remember that the program needs to be recompiled without -g after the testing has been completed.
|
||||
|
||||
To use Mtrace, you need to have some basic knowledge of environment variables in Linux, given that the path to the user-specified file -- which the mtrace() function uses to log all the information -- has to be set as a value for the MALLOC_TRACE environment variable before the program is executed.
|
||||
|
||||
Feature-wise, Mtrace is limited to detecting memory leaks and attempts to free up memory that was never allocated. It can't detect other memory-related issues such as illegal memory access or use of uninitialized memory. Also, [there have been complaints][43] that it's not [thread-safe][44].
|
||||
|
||||
### Conclusions ###
|
||||
|
||||
Needless to say, each memory debugger that I've discussed here has its own qualities and limitations. So, which one is best suited for you mostly depends on what features you require, although ease of setup and use might also be a deciding factor in some cases.
|
||||
|
||||
Mtrace is best suited for cases where you just want to catch memory leaks in your software program. It can save you some time, too, since the tool comes pre-installed on your Linux system, something which is also helpful in situations where the development machines aren't connected to the Internet or you aren't allowed to download a third party tool for any kind of debugging.
|
||||
|
||||
Dmalloc, on the other hand, can not only detect more error types compared to Mtrace, but also provides more features, such as runtime configurability and GDB integration. Also, unlike any other tool discussed here, Dmalloc is thread-safe. Not to mention that it comes with detailed documentation, making it ideal for beginners.
|
||||
|
||||
Although Memwatch comes with even more comprehensive documentation than Dmalloc, and can detect even more error types, you can only use it with software written in the C programming language. One of its features that stands out is that it lets you handle its output from within the code of your program, something that is helpful in case you want to customize the format of the output.
|
||||
|
||||
If making changes to your program's source code is not what you want, you can use Electric Fence. However, keep in mind that it can only detect a couple of error types, and that doesn't include memory leaks. Plus, you also need to know GDB basics to make the most out of this memory-debugging tool.
|
||||
|
||||
Memcheck is probably the most comprehensive of them all. It detects more error types and provides more features than any other tool discussed here -- and it doesn't require you to make any changes in your program's source code.But be aware that, while the learning curve is not very high for basic usage, if you want to use its advanced features, a level of expertise is definitely required.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.computerworld.com/article/3003957/linux/review-5-memory-debuggers-for-linux-coding.html
|
||||
|
||||
作者：[Himanshu Arora][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.computerworld.com/author/Himanshu-Arora/
|
||||
[1]:https://openclipart.org/detail/132427/penguin-admin
|
||||
[2]:https://en.wikipedia.org/wiki/Manual_memory_management
|
||||
[3]:http://dmalloc.com/
|
||||
[4]:https://www.owasp.org/index.php/Double_Free
|
||||
[5]:https://stuff.mit.edu/afs/sipb/project/gnucash-test/src/dmalloc-4.8.2/dmalloc.html#Fence-Post%20Overruns
|
||||
[6]:http://dmalloc.com/releases/notes/dmalloc-5.5.2.html
|
||||
[7]:http://www.gnu.org/software/gdb/
|
||||
[8]:http://dmalloc.com/docs/
|
||||
[9]:http://dmalloc.com/docs/latest/online/dmalloc_26.html#SEC32
|
||||
[10]:http://dmalloc.com/docs/latest/online/dmalloc_23.html#SEC29
|
||||
[11]:https://en.wikipedia.org/wiki/Memory_management#Dynamic_memory_allocation
|
||||
[12]:https://en.wikipedia.org/wiki/Segmentation_fault
|
||||
[13]:https://en.wikipedia.org/wiki/GNU_Compiler_Collection
|
||||
[14]:http://www.gnu.org/software/gdb/
|
||||
[15]:https://launchpad.net/ubuntu/+source/electric-fence/2.2.3
|
||||
[16]:http://valgrind.org/docs/manual/mc-manual.html
|
||||
[17]:http://valgrind.org/info/developers.html
|
||||
[18]:http://valgrind.org/
|
||||
[19]:http://valgrind.org/docs/manual/dist.news.html
|
||||
[20]:http://valgrind.org/docs/manual/mc-manual.html#mc-manual.suppfiles
|
||||
[21]:http://valgrind.org/docs/manual/mc-manual.html#mc-manual.mempools
|
||||
[22]:http://stackoverflow.com/questions/4642671/c-memory-allocators
|
||||
[23]:http://valgrind.org/docs/manual/mc-manual.html#mc-manual.monitor-commands
|
||||
[24]:http://valgrind.org/docs/manual/mc-manual.html#mc-manual.clientreqs
|
||||
[25]:http://valgrind.org/docs/manual/valgrind_manual.pdf
|
||||
[26]:http://sourceforge.net/p/valgrind/mailman/message/30292453/
|
||||
[27]:https://msdn.microsoft.com/en-us/library/ee798431%28v=cs.20%29.aspx
|
||||
[28]:http://www.computerworld.com/article/2484425/linux/5-free-linux-text-editors-for-programming-and-word-processing.html?nsdr=true&page=2
|
||||
[29]:http://valgrind.org/docs/manual/manual-core.html#manual-core.limits
|
||||
[30]:http://valgrind.org/info/
|
||||
[31]:http://www.linkdata.se/sourcecode/memwatch/
|
||||
[32]:http://www.cecalc.ula.ve/documentacion/tutoriales/WorkshopDebugger/007-2579-007/sgi_html/ch09.html
|
||||
[33]:http://c2.com/cgi/wiki?WildPointer
|
||||
[34]:https://en.wikipedia.org/wiki/Standard_streams#Standard_output_.28stdout.29
|
||||
[35]:http://www.gnu.org/software/libc/manual/html_node/Tracing-malloc.html
|
||||
[36]:https://www.gnu.org/software/libc/
|
||||
[37]:https://sourceware.org/git/?p=glibc.git;a=history;f=malloc/mtrace.c;h=df10128b872b4adc4086cf74e5d965c1c11d35d2;hb=HEAD
|
||||
[38]:https://sourceware.org/git/?p=glibc.git;a=history;f=malloc/mtrace.pl;h=0737890510e9837f26ebee2ba36c9058affb0bf1;hb=HEAD
|
||||
[39]:http://webcache.googleusercontent.com/search?q=cache:s6ywlLtkSqQJ:www.gnu.org/s/libc/manual/html_node/Tips-for-the-Memory-Debugger.html+&cd=1&hl=en&ct=clnk&gl=in&client=Ubuntu
|
||||
[40]:http://www.gnu.org/software/libc/manual/html_node/Using-the-Memory-Debugger.html#Using-the-Memory-Debugger
|
||||
[41]:http://linux.die.net/man/1/gcc
|
||||
[42]:http://linux.die.net/man/1/g++
|
||||
[43]:https://sourceware.org/ml/libc-help/2014-05/msg00008.html
|
||||
[44]:https://en.wikipedia.org/wiki/Thread_safety
|
||||
@ -0,0 +1,171 @@
|
||||
20 Years of GIMP Evolution: Step by Step
|
||||
================================================================================
|
||||
注：youtube 视频
|
||||
<iframe width="660" height="371" frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/PSJAzJ6mkVw?feature=oembed"></iframe>
|
||||
|
||||
[GIMP][1] (GNU Image Manipulation Program) – superb open source and free graphics editor. Development began in 1995 as students project of the University of California, Berkeley by Peter Mattis and Spencer Kimball. In 1997 the project was renamed in “GIMP” and became an official part of [GNU Project][2]. During these years the GIMP is one of the best graphics editor and platinum holy wars “GIMP vs Photoshop” – one of the most popular.
|
||||
|
||||
The first announce, 21.11.1995:
|
||||
|
||||
> From: Peter Mattis
|
||||
>
|
||||
> Subject: ANNOUNCE: The GIMP
|
||||
>
|
||||
> Date: 1995-11-21
|
||||
>
|
||||
> Message-ID: <48s543$r7b@agate.berkeley.edu>
|
||||
>
|
||||
> Newsgroups: comp.os.linux.development.apps,comp.os.linux.misc,comp.windows.x.apps
|
||||
>
|
||||
> The GIMP: the General Image Manipulation Program
|
||||
> ------------------------------------------------
|
||||
>
|
||||
> The GIMP is designed to provide an intuitive graphical interface to a
|
||||
> variety of image editing operations. Here is a list of the GIMP's
|
||||
> major features:
|
||||
>
|
||||
> Image viewing
|
||||
> -------------
|
||||
>
|
||||
> * Supports 8, 15, 16 and 24 bit color.
|
||||
> * Ordered and Floyd-Steinberg dithering for 8 bit displays.
|
||||
> * View images as rgb color, grayscale or indexed color.
|
||||
> * Simultaneously edit multiple images.
|
||||
> * Zoom and pan in real-time.
|
||||
> * GIF, JPEG, PNG, TIFF and XPM support.
|
||||
>
|
||||
> Image editing
|
||||
> -------------
|
||||
>
|
||||
> * Selection tools including rectangle, ellipse, free, fuzzy, bezier
|
||||
> and intelligent.
|
||||
> * Transformation tools including rotate, scale, shear and flip.
|
||||
> * Painting tools including bucket, brush, airbrush, clone, convolve,
|
||||
> blend and text.
|
||||
> * Effects filters (such as blur, edge detect).
|
||||
> * Channel & color operations (such as add, composite, decompose).
|
||||
> * Plug-ins which allow for the easy addition of new file formats and
|
||||
> new effect filters.
|
||||
> * Multiple undo/redo.
|
||||
|
||||
GIMP 0.54, 1996
|
||||
|
||||
|
||||
|
||||
GIMP 0.54 was required X11 displays, X-server and Motif 1.2 wigdets and supported 8, 15, 16 & 24 color depths with RGB & grayscale colors. Supported images format: GIF, JPEG, PNG, TIFF and XPM.
|
||||
|
||||
Basic functionality: rectangle, ellipse, free, fuzzy, bezier, intelligent selection tools, and rotate, scale, shear, clone, blend and flip images.
|
||||
|
||||
Extended tools: text operations, effects filters, tools for channel and colors manipulation, undo and redo operations. Since the first version GIMP support the plugin system.
|
||||
|
||||
GIMP 0.54 can be ran in Linux, HP-UX, Solaris, SGI IRIX.
|
||||
|
||||
### GIMP 0.60, 1997 ###
|
||||
|
||||
|
||||
|
||||
This is development release, not for all users. GIMP has the new toolkits – GDK (GIMP Drawing Kit) and GTK (GIMP Toolkit), Motif support is deprecated. GIMP Toolkit is also begin of the GTK+ cross-platform widget toolkit. New features:
|
||||
|
||||
- basic layers
|
||||
- sub-pixel sampling
|
||||
- brush spacing
|
||||
- improver airbrush
|
||||
- paint modes
|
||||
|
||||
### GIMP 0.99, 1997 ###
|
||||
|
||||
|
||||
|
||||
Since 0.99 version GIMP has the scripts add macros (Script-Fus) support. GTK and GDK with some improvements has now the new name – GTK+. Other improvements:
|
||||
|
||||
- support big images (rather than 100 MB)
|
||||
- new native format – XCF
|
||||
- new API – write plugins and extensions is easy
|
||||
|
||||
### GIMP 1.0, 1998 ###
|
||||
|
||||
|
||||
|
||||
GIMP and GTK+ was splitted into separate projects. The GIMP official website has
|
||||
reconstructed and contained new tutorials, plugins and documentation. New features:
|
||||
|
||||
- tile-based memory management
|
||||
- massive changes in plugin API
|
||||
- XFC format now support layers, guides and selections
|
||||
- web interface
|
||||
- online graphics generation
|
||||
|
||||
### GIMP 1.2, 2000 ###
|
||||
|
||||
New features:
|
||||
|
||||
- translation for non-english languages
|
||||
- fixed many bugs in GTK+ and GIMP
|
||||
- many new plugins
|
||||
- image map
|
||||
- new toolbox: resize, measure, dodge, burn, smugle, samle colorize and curve bend
|
||||
- image pipes
|
||||
- images preview before saving
|
||||
- scaled brush preview
|
||||
- recursive selection by path
|
||||
- new navigation window
|
||||
- drag’n’drop
|
||||
- watermarks support
|
||||
|
||||
### GIMP 2.0, 2004 ###
|
||||
|
||||
|
||||
|
||||
The biggest change – new GTK+ 2.x toolkit.
|
||||
|
||||
### GIMP 2.2, 2004 ###
|
||||
|
||||
|
||||
|
||||
Many bugfixes and drag’n’drop support.
|
||||
|
||||
### GIMP 2.4, 2007 ###
|
||||
|
||||
|
||||
|
||||
New features:
|
||||
|
||||
- better drag’n’drop support
|
||||
- Ti-Fu was replaced to Script-Fu – the new script interpreter
|
||||
- new plugins: photocopy, softglow, neon, cartoon, dog, glob and others
|
||||
|
||||
### GIMP 2.6, 2008 ###
|
||||
|
||||
New features:
|
||||
|
||||
- renew graphics interface
|
||||
- new select and tool
|
||||
- GEGL (GEneric Graphics Library) integration
|
||||
- “The Utility Window Hint” for MDI behavior
|
||||
|
||||
### GIMP 2.8, 2012 ###
|
||||
|
||||
|
||||
|
||||
New features:
|
||||
|
||||
- GUI has some visual changes
|
||||
- new save and export menu
|
||||
- renew text editor
|
||||
- layers group support
|
||||
- JPEG2000 and export to PDF support
|
||||
- webpage screenshot tool
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://tlhp.cf/20-years-of-gimp-evolution/
|
||||
|
||||
作者：[Pavlo Rudyi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://tlhp.cf/author/paul/
|
||||
[1]:https://gimp.org/
|
||||
[2]:http://www.gnu.org/
|
||||
@ -0,0 +1,51 @@
|
||||
Linux Foundation Explains a "World without Linux" and Open Source
|
||||
================================================================================
|
||||
> The Linux Foundation responds to questions about its "World without Linux" movies, including what the Internet would be like without Linux and other open source software.
|
||||
|
||||
|
||||
|
||||
Would the world really be tremendously different if Linux, the open source operating system kernel, did not exist? Would there be no Internet or movies? Those are the questions some viewers of the [Linux Foundation's][1] ongoing "[World without Linux][2]" video series are asking. Here are some answers.
|
||||
|
||||
In case you've missed it, the "World without Linux" series is a collection of quirky short films that depict, well, a world without Linux (and open source software more generally). They have emphasized themes like [Linux's role in movie-making][3] and in [serving the Internet][4].
|
||||
|
||||
To offer perspective on the series's claims, direction and hidden symbols, Jennifer Cloer, vice president of communications at The Linux Foundation, recently sent The VAR Guy responses to some common queries about the movies. Below are the answers, in her own words.
|
||||
|
||||
### The latest episode takes Sam and Annie to the movies. Would today's graphics really be that much different without Linux? ###
|
||||
|
||||
In episode #4, we do a bit of a parody on "Avatar." Love it or hate it, the graphics in the real "Avatar" are pretty impressive. In a world without Linux, the graphics would be horrible but we wouldn't even know it because we wouldn't know any better. But in fact, "Avatar" was created using Linux. Weta Digital used one of the world's largest Linux clusters to render the film and do 3D modeling. It's also been reported that "Lord of the Rings," "Fantastic Four" and "King Kong," among others, have used Linux. We hope this episode can bring attention to that work, which hasn't been widely reported.
|
||||
|
||||
### Some people criticized the original episode for concluding there would be no Internet without Linux. What's your reaction? ###
|
||||
|
||||
We enjoyed the debate that resulted from the debut episode. With more than 100,000 views to date of that episode alone, it brought awareness to the role that Linux plays in society and to the worldwide community of contributors and supporters. Of course the Internet would exist without Linux but it wouldn't be the Internet we know today and it wouldn't have matured at the pace it has. Each episode makes a bold and fun statement about Linux's role in our every day lives. We hope this can help extend the story of Linux to more people around the world.
|
||||
|
||||
### Why is Sam and Annie's cat named String? ###
|
||||
|
||||
Nothing in the series is a coincidence. Look closely and you'll find all kinds of inside Linux and geek jokes. String is named after String theory and was named by our Linux.com Editor Libby Clark. In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other. Kind of like Sam, Annie and String in a World Without Linux.
|
||||
|
||||
### What can we expect from the next two episodes and, in particular, the finale? When will it air? ###
|
||||
|
||||
In episode #5, we'll go to space and experience what a world without Linux would mean to exploration. It's a wild ride. In the finale, we finally get to see Linus in a world without Linux. There have been clues throughout the series as to what this finale will include but I can't give more than that away since there are ongoing contests to find the clues. And I can't give away the air date for the finale! You'll have to follow #WorldWithoutLinux to learn more.
|
||||
|
||||
### Can you give us a hint on the clues in episode #4? ###
|
||||
|
||||
There is another reference to the Free Burger Restaurant in this episode. Linux also actually does appear in this world without Linux but in a very covert way; you could say it's like reading Linux in another language. And, of course, just for fun, String makes another appearance.
|
||||
|
||||
### Is the series achieving what you hoped? ###
|
||||
|
||||
Yes. We're really happy to see people share and engage with these stories. We hope that it's reaching people who might not otherwise know the story of Linux or understand its pervasiveness in the world today. It's really about surfacing this to a broader audience and giving thanks to the worldwide community of developers and companies that support Linux and all the things it makes possible.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://thevarguy.com/open-source-application-software-companies/linux-foundation-explains-world-without-linux-and-open-so
|
||||
|
||||
作者：[Christopher Tozzi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://thevarguy.com/author/christopher-tozzi
|
||||
[1]:http://linuxfoundation.org/
|
||||
[2]:http://www.linuxfoundation.org/world-without-linux
|
||||
[3]:http://thevarguy.com/open-source-application-software-companies/new-linux-foundation-video-highlights-role-open-source-3d
|
||||
[4]:http://thevarguy.com/open-source-application-software-companies/100715/would-internet-exist-without-linux-yes-without-open-sourc
|
||||
@ -0,0 +1,77 @@
|
||||
Microsoft and Linux: True Romance or Toxic Love?
|
||||
================================================================================
|
||||
Every now and then, you come across a news story that makes you choke on your coffee or splutter hot latte all over your monitor. Microsoft's recent proclamations of love for Linux is an outstanding example of such a story.
|
||||
|
||||
Common sense says that Microsoft and the FOSS movement should be perpetual enemies. In the eyes of many, Microsoft embodies most of the greedy excesses that the Free Software movement rejects. In addition, Microsoft previously has labeled Linux as a cancer and the FOSS community as a "pack of thieves".
|
||||
|
||||
We can understand why Microsoft has been afraid of a free operating system. When combined with open-source applications that challenge Microsoft's core line, it threatens Microsoft's grip on the desktop/laptop market.
|
||||
|
||||
In spite of Microsoft's fears over its desktop dominance, the Web server marketplace is one arena where Linux has had the greatest impact. Today, the majority of Web servers are Linux boxes. This includes most of the world's busiest sites. The sight of so much unclaimed licensing revenue must be painful indeed for Microsoft.
|
||||
|
||||
Handheld devices are another realm where Microsoft has lost ground to free software. At one point, its Windows CE and Pocket PC operating systems were at the forefront of mobile computing. Windows-powered PDA devices were the shiniest and flashiest gadgets around. But, that all ended when Apple released its iPhone. Since then, Android has stepped into the limelight, with Windows Mobile largely ignored and forgotten. The Android platform is built on free and open-source components.
|
||||
|
||||
The rapid expansion in Android's market share is due to the open nature of the platform. Unlike with iOS, any phone manufacturer can release an Android handset. And, unlike with Windows Mobile, there are no licensing fees. This has been really good news for consumers. It has led to lots of powerful and cheap handsets appearing from manufacturers all over the world. It's a very definite vindication of the value of FOSS software.
|
||||
|
||||
Losing the battle for the Web and mobile computing is a brutal loss for Microsoft. When you consider the size of those two markets combined, the desktop market seems like a stagnant backwater. Nobody likes to lose, especially when money is on the line. And, Microsoft does have a lot to lose. You would expect Microsoft to be bitter about it. And in the past, it has been.
|
||||
|
||||
Microsoft has fought back against Linux and FOSS using every weapon at its disposal, from propaganda to patent threats, and although these attacks have slowed the adoption of Linux, they haven't stopped it.
|
||||
|
||||
So, you can forgive us for being shocked when Microsoft starts handing out t-shirts and badges that say "Microsoft Loves Linux" at open-source conferences and events. Could it be true? Does Microsoft really love Linux?
|
||||
|
||||
Of course, PR slogans and free t-shirts do not equal truth. Actions speak louder than words. And when you consider Microsoft's actions, Microsoft's stance becomes a little more ambiguous.
|
||||
|
||||
On the one hand, Microsoft is recruiting hundreds of Linux developers and sysadmins. It's releasing its .NET Core framework as an open-source project with cross-platform support (so that .NET apps can run on OS X and Linux). And, it is partnering with Linux companies to bring popular distros to its Azure platform. In fact, Microsoft even has gone so far as to create its own Linux distro for its Azure data center.
|
||||
|
||||
On the other hand, Microsoft continues to launch legal attacks on open-source projects directly and through puppet corporations. It's clear that Microsoft hasn't had some big moral change of heart over proprietary vs. free software, so why the public declarations of adoration?
|
||||
|
||||
To state the obvious, Microsoft is a profit-making entity. It's an investment vehicle for its shareholders and a source of income for its employees. Everything it does has a single ultimate goal: revenue. Microsoft doesn't act out of love or even hate (although that's a common accusation).
|
||||
|
||||
So the question shouldn't be "does Microsoft really love Linux?" Instead, we should ask how Microsoft is going to profit from all this.
|
||||
|
||||
Let's take the open-source release of .NET Core. This move makes it easy to port the .NET runtime to any platform. That extends the reach of Microsoft's .NET framework far beyond the Windows platform.
|
||||
|
||||
Opening .NET Core ultimately will make it possible for .NET developers to produce cross-platform apps for OS X, Linux, iOS and even Android--all from a single codebase.
|
||||
|
||||
From a developer's perspective, this makes the .NET framework much more attractive than before. Being able to reach many platforms from a single codebase dramatically increases the potential target market for any app developed using the .NET framework.
|
||||
|
||||
What's more, a strong Open Source community would provide developers with lots of code to reuse in their own projects. So, the availability of open-source projects would make the .NET framework.
|
||||
|
||||
On the plus side, opening .NET Core reduces fragmentation across different platforms and means a wider choice of apps for consumers. That means more choice, both in terms of open-source software and proprietary apps.
|
||||
|
||||
From Microsoft's point of view, it would gain a huge army of developers. Microsoft profits by selling training, certification, technical support, development tools (including Visual Studio) and proprietary extensions.
|
||||
|
||||
The question we should ask ourselves is does this benefit or hurt the Free Software community?
|
||||
|
||||
Widespread adoption of the .NET framework could mean the eventual death of competing open-source projects, forcing us all to dance to Microsoft's tune.
|
||||
|
||||
Moving beyond .NET, Microsoft is drawing a lot of attention to its Linux support on its Azure cloud computing platform. Remember, Azure originally was Windows Azure. That's because Windows Server was the only supported operating system. Today, Azure offers support for a number of Linux distros too.
|
||||
|
||||
There's one reason for this: paying customers who need and want Linux services. If Microsoft didn't offer Linux virtual machines, those customers would do business with someone else.
|
||||
|
||||
It looks like Microsoft is waking up to the fact that Linux is here to stay. Microsoft cannot feasibly wipe it out, so it has to embrace it.
|
||||
|
||||
This brings us back to the question of why there is so much buzz about Microsoft and Linux. We're all talking about it, because Microsoft wants us to think about it. After all, all these stories trace back to Microsoft, whether it's through press releases, blog posts or public announcements at conferences. The company is working hard to draw attention to its Linux expertise.
|
||||
|
||||
What other possible purpose could be behind Chief Architect Kamala Subramaniam's blog post announcing Azure Cloud Switch? ACS is a custom Linux distro that Microsoft uses to automate the configuration of its switch hardware in the Azure data centers.
|
||||
|
||||
ACS is not publicly available. It's intended for internal use in the Azure data center, and it's unlikely that anyone else would be able to find a use for it. In fact, Subramaniam states the same thing herself in her post.
|
||||
|
||||
So, Microsoft won't be making any money from selling ACS, and it won't attract a user base by giving it away. Instead, Microsoft gets to draw attention to Linux and Azure, strengthening its position as a Linux cloud computing platform.
|
||||
|
||||
Is Microsoft's new-found love for Linux good news for the community?
|
||||
|
||||
We shouldn't be slow to forget Microsoft's mantra of Embrace, Extend and Exterminate. Right now, Microsoft is very much in the early stages of embracing Linux. Will Microsoft seek to splinter the community through custom extensions and proprietary "standards"?
|
||||
|
||||
Let us know what you think in the comments below.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.linuxjournal.com/content/microsoft-and-linux-true-romance-or-toxic-love-0
|
||||
|
||||
作者：[James Darvell][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.linuxjournal.com/users/james-darvell
|
||||
87
sources/talk/20151201 Cinnamon 2.8 Review.md
Normal file
87
sources/talk/20151201 Cinnamon 2.8 Review.md
Normal file
@ -0,0 +1,87 @@
|
||||
Cinnamon 2.8 Review
|
||||
================================================================================
|
||||
|
||||
|
||||
Other than Gnome and KDE, Cinnamon is another desktop environment that is used by many people. It is made by the same team that produces Linux Mint (and ships with Linux Mint) and can also be installed on several other distributions. The latest version of this DE – Cinnamon 2.8 – was released earlier this month, and it brings a host of bug fixes and improvements as well as some new features.
|
||||
|
||||
I’m going to go over the major improvements made in this release as well as how to update to Cinnamon 2.8 or install it for the first time.
|
||||
|
||||
### Improvements to Applets ###
|
||||
|
||||
There are several improvements to already existing applets for the panel.
|
||||
|
||||
#### Sound Applet ####
|
||||
|
||||
|
||||
|
||||
The Sound applet was revamped and now displays track information as well as the media controls on top of the cover art of the audio file. For music players with seeking support (such as Banshee), a progress bar will be displayed in the same region which you can use to change the position of the audio track. Right-clicking on the applet in the panel will display the options to mute input and output devices.
|
||||
|
||||
#### Power Applet ####
|
||||
|
||||
The Power applet now displays the status of each of the connected batteries and devices using the manufacturer’s data instead of generic names.
|
||||
|
||||
#### Window Thumbnails ####
|
||||
|
||||
|
||||
|
||||
Cinnamon 2.8 brings the option to show window thumbnails when hovering over the window list in the panel. You can turn it off if you don’t like it, though.
|
||||
|
||||
#### Workspace Switcher Applet ####
|
||||
|
||||
|
||||
|
||||
Adding the Workspace switcher applet to your panel will show you a visual representation of your workspaces with little rectangles embedded inside to show the position of your windows.
|
||||
|
||||
#### System Tray ####
|
||||
|
||||
Cinnamon 2.8 brings support for app indicators in the system tray. You can easily disable this in the settings which will force affected apps to fall back to using status icons instead.
|
||||
|
||||
### Visual Improvements ###
|
||||
|
||||
A host of visual improvements were made in Cinnamon 2.8. The classic and preview Alt + Tab switchers were polished with noticeable improvements, while the Alt + F2 dialog received bug fixes and better auto completion for commands.
|
||||
|
||||
Also, the issue with the traditional animation effect for minimizing windows is now sorted and works with multiple panels.
|
||||
|
||||
### Nemo Improvements ###
|
||||
|
||||
|
||||
|
||||
The default file manager for Cinnamon also received several bug fixes and has a new “Quick-rename” feature for renaming files and directories. This works by clicking the file or directory twice with a short pause in between to rename the files.
|
||||
|
||||
Nemo also detects issues with thumbnails automatically and prompts you to quickly fix them.
|
||||
|
||||
### Other Notable improvements ###
|
||||
|
||||
- Applets now reload themselves automatically once they are updated.
|
||||
- Support for multiple monitors was improved significantly.
|
||||
- Dialog windows have been improved and now attach themselves to their parent windows.
|
||||
- HiDPI dectection has been improved.
|
||||
- QT5 applications now look more native and use the default GTK theme.
|
||||
- Window management and rendering performance has been improved.
|
||||
- There are various bugfixes.
|
||||
|
||||
### How to Get Cinnamon 2.8 ###
|
||||
|
||||
If you’re running Linux Mint you will get Cinnamon 2.8 as part of the upgrade to Linux Mint 17.3 “Rosa” Cinnamon Edition. The BETA release is already out, so you can grab that if you’d like to get your hands on the new software immediately.
|
||||
|
||||
For Arch users, Cinnamon 2.8 is already in the official Arch repositories, so you can just update your packages and do a system-wide upgrade to get the latest version.
|
||||
|
||||
Finally, for Ubuntu users, you can install or upgrade to Cinnamon 2.8 by running in turn the following commands:
|
||||
|
||||
sudo add-apt-repository -y ppa:moorkai/cinnamon
|
||||
sudo apt-get update
|
||||
sudo apt-get install cinnamon
|
||||
|
||||
Have you tried Cinnamon 2.8? What do you think of it?
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://www.maketecheasier.com/cinnamon-2-8-review/
|
||||
|
||||
作者：[Ayo Isaiah][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://www.maketecheasier.com/author/ayoisaiah/
|
||||
53
sources/talk/20151202 KDE vs GNOME vs XFCE Desktop.md
Normal file
53
sources/talk/20151202 KDE vs GNOME vs XFCE Desktop.md
Normal file
@ -0,0 +1,53 @@
|
||||
KDE vs GNOME vs XFCE Desktop
|
||||
================================================================================
|
||||
|
||||
|
||||
Over many years, many people spent a long time with Linux desktop using either KDE or GNOME. These two environments have grown through the previous years and each of these desktops continued to expand their current user-base. For example, sleeper desktop environment has been XFCE as XFCE offers more robustness than LXDE that lacks much of XFCE’s polish in the default configuration. The XFCE provides all benefits which users enjoyed in the GNOME 2, but with some lightweight experiences which made it a hit on the older computers.
|
||||
|
||||
### The Desktop Theming ###
|
||||
|
||||
After the user has fresh installation, the XFCE will be a bit boring, which lacks some certain visual attractiveness to it. So, don’t misunderstand my words here, the XFCE is still having nice looking desktop, but it may be like vanilla in users’ eyes as well as most people who are new to the XFCE desktop environment. The good news here is that while installing new theme to the XFCE, it is a reasonably easy process as you can easily find the right XFCE theme which appeals to you, after that, you can extract that theme to the proper directory. From this point, the XFCE comes with an important tool located under the Appearance for helping the user to select the chosen theme easily throughout the Graphical User Interface (GUID). There’re no other tools that might be required here, and if the user follows the above directions, it will be a bit simple for everyone who is caring to have a try.
|
||||
|
||||
On the GNOME desktop, the user should follow the similar above approach. The main key difference for this point is that users have to download and then install GNOME Tweak Tool before proceeding with anything. It does not have any huge barriers under any means, but it is simple valid oversight when the user consider that the XFCE does not require any tweak tool in order for installing and activating the new desktop themes. By being under the GNOME, and especially after installing that Tweak tool which is mentioned above, you will need to go ahead and also to make sure that you have the extension of User Themes installed.
|
||||
|
||||
The same as with the XFCE, the user will want to search for, and then download the theme which most appeals personally to him. Then, user can revisit to the GNOME Tweak tool, and click on the Appearance option on left side of that Tweak tool. Then, the user can simply look at the bottom of the page and click on file browse button to right of the Shell Theme. User then can browse to the zipped folder, and click open. In case if this process was successfully done, the user will see an alert that tell him that it was installed without any problems. From this point, user can simply use the pull down menu in order for selecting the theme he wants to use. The same as with the XFCE, process of theme activation is very easy, however, a need to download the non-included application for using a new theme will leave much to be desired.
|
||||
|
||||
Finally, there is the process of the KDE desktop theming. The same as with XFCE, there is no need at all to install any extra tools for making it work. This is one area where there is a feeling that the XFCE has to make the KDE the winner. Not only the installing themes in the KDE is accomplished entirely within the Graphical User Interface, but it’s also even possible to click on (Get New Themes) button and user will be able to locate, view, and also install the new themes automatically.
|
||||
|
||||
However, it should be noted that the KDE is a bit more robust desktop environment comparing to the XFCE. Therefore, it is a bit reasonable now to see why such extra functionalities could be missing from the desktops which are mainly designed to be minimalist. So, we all have to give the KDE props for such outstanding functionality.
|
||||
|
||||
### MATE is not Lightweight Desktop ###
|
||||
|
||||
Before continuing with the comparison between the XFCE, the GNOME 3 and the KDE, it should be clear for experts that we can’t touch the MATE desktop as an option in the comparison. MATE can be considered as the GNOME 2 desktop’s next incarnation, but it’s not mainly marketed to be a lightweight or fast desktop. But instead of that, its primary goal is to be more traditional and comfortable desktop environment where the users can feel right at their home to use it.
|
||||
|
||||
On the other hand, the XFCE comes with a completely other goal set. The XFCE offers its users a more lightweight and yet still visually appealing desktop experience. Then, for everyone who points out that MATE is a lightweight desktop too, it isn’t really targeting that lightweight desktop crowd. Both options may be dressed up for looking quite attractive with the proper theme installed.
|
||||
|
||||
### The Navigation of Desktop ###
|
||||
|
||||
The XFCE honestly offers an obvious navigation which is out of the box. Anyone who is used to the traditional Windows or the GNOME 2/MATE desktop experience will be going to have the ability to navigate around the new XFCE installation without any kind of help. Straight away, adding the applets to panel is still very obvious. The same as with locating installed applications, just use the launcher and simply click on any desired application. With an exception of LXDE and MATE, there is no other desktop that can make the navigation that simple. What can be even better is that fact which the control panel is very easy to use, that is a really big benefit to everyone who is new to the desktop environment. If the user prefer older methods to use his desktop, then GNOME is not an option. With the hot corners as well as the no minimize button, plus the other application layout method, it’ll take the most newcomers getting easily used to it.
|
||||
|
||||
If the user is coming from, as an example, Windows environment, then he is going to be put off by the inability to add applets to the top of his workspace simply with just a mere right-click. Just instead of this, it can be handled by using extensions. Installing extensions in the GNOME is granted and is a brain-dead easy, based on the easy to use (on/off) toggle switches located on the extensions page of the GNOME. Users have to know, sadly, to actually visit that page to enjoy this functionality.
|
||||
|
||||
On the other side, the GNOME is sharing its desire for providing a straight forward and an easy to use control panel, which many of you may think that it is not be a big deal, but it is really something that I by myself find commendable and worth to be mentioned. The KDE offers its users a bit more traditional desktop experience, throughout familiar launchers as well as the ability for getting to the software in more familiar way if they are coming from Windows desktop. The process of adding widgets or applets to the KDE desktop is an easy matter of just right-clicking on the bottom of the desktop. Only the problem with the KDE’s approach is to be that, as many things KDE, the feature which users are actually looking for are hidden. The KDE users might berate my opinion for this, but I still stand by my statement.
|
||||
|
||||
In order for adding a Widget, just right-click on “my panel”, just to see the panel options, but not as an immediate method to install Widgets. You will not actually see the Add Widgets until you select the Panel Options, then the Add Widgets. This not a big deal to me, but later for some users, it becomes unnecessary tidbit of confusion. To make things here more convoluted, after the users manage to locate Widgets area they discover later a brand new term called “Activities”. It is in the same area as the Widgets, yet it is somehow in its own area as to what it does.
|
||||
|
||||
Now don’t misunderstand me, the Activities feature in the KDE is totally great and actually valued. But to look at it from the usability standpoint, I think that it would be better suited in another menu option in order to not confuse the newbies. User is welcome to differ, but to test this with newbies for some extended periods of time can prove the correct over and over again. The rant against the Activities placement aside, the KDE approach to add new widgets is really great. The same as with the KDE themes, user can’t browse through and install the Widgets automatically via using the provided Graphical User Interface. It is a bit fantastic of functionality, and also it could be celebrated such way. The control panel of the KDE is not as easy as the user might like it to be, yet it is a bit clear that this’s something that they are still working on.
|
||||
|
||||
### So, the XFCE is the best desktop, right? ###
|
||||
|
||||
I, by myself, actually run GNOME, KDE, and XFCE on my computers in my office and home. I also have some older machines with OpenBox and LXDE too. Each desktop experience can offer something that is a bit useful to me and may help me to use each machine as I see that it is fit. For me, I have a soft spot in my heart for the XFCE as it is one of the desktop environments which I stuck with for years. But in this article, I’m just writing it on my daily use computer which is in fact, GNOME.
|
||||
|
||||
The main idea here is that I still feel that the XFCE provides a bit better user experience for users who are looking for stable, traditional, and easy to understand desktop environment. You are also welcome to share with us your opinion in the comments section.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.unixmen.com/kde-vs-gnome-vs-xfce-desktop/
|
||||
|
||||
作者：[M.el Khamlichi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.unixmen.com/author/pirat9/
|
||||
@ -0,0 +1,155 @@
|
||||
10 tools for visual effects in Linux with Kdenlive
|
||||
================================================================================
|
||||
|
||||
Image credits : Seth Kenlon. [CC BY-SA 4.0.][1]
|
||||
|
||||
[Kdenlive][2] is one of those applications; you can use it daily for a year and wake up one morning only to realize that you still have only grazed the surface of all of its potential. That's why it's nice every once in a while to sit back and look over some of the lesser-used tricks and tools in Kdenlive. Even though something's not used as often as, say, the Spacer or Razor tools, it still may end up being just the right finishing touch on your latest masterpiece.
|
||||
|
||||
Most of the tools I'll discuss here are not officially part of Kdenlive; they are plugins from the [Frei0r][3] package. These are ubiquitous parts of video processing on Linux and Unix, and they usually get installed along with Kdenlive as distributed by most Linux distributions, so they often seem like part of the application. If your install of Kdenlive does not feature some of the tools mentioned here, make sure that you have Frei0r plugins installed.
|
||||
|
||||
Since many of the tools in this article affect the look of an image, here is the base image, without effects or adjustment:
|
||||
|
||||
|
||||
|
||||
Still image grabbed from a video by Footage Firm, Inc. [CC BY-SA 4.0.][1]
|
||||
|
||||
Let's get started.
|
||||
|
||||
### 1. Color effect ###
|
||||
|
||||
|
||||
|
||||
You can find the **Color Effect** filter in **Add Effect > Misc** context menu. As filters go, it's mostly just a preset; the only controls it has are which filter you want to use.
|
||||
|
||||
|
||||
|
||||
Normally that's the kind of filter I avoid, but I have to be honest: Sometimes a plug-and-play solution is exactly what you want. This filter has a few different settings, but the two that make it worth while (at least for me) are the Sepia and XPro effects. Admittedly, controls to adjust how sepia tone the sepia effect is would be nice, but no matter what, when you need a quick and familiar color effect, this is the filter to throw onto a clip. It's immediate, it's easy, and if your client asks for that look, this does the trick every time.
|
||||
|
||||
### 2. Colorize ###
|
||||
|
||||
|
||||
|
||||
The simplicity of the **Colorize** filter in **Add Effect > Misc** is also its strength. In some editing applications, it takes two filters and some compositing to achieve this simple color-wash effect. It's refreshing that in Kdenlive, it's a matter of one filter with three possible controls (only one of which, strictly speaking, is necessary to achieve the look).
|
||||
|
||||
|
||||
|
||||
Its use is intuitive; use the **Hue** slider to set the color. Use the other controls to adjust the luma of the base image as needed.
|
||||
|
||||
This is not a filter I use every day, but for ad spots, bumpers, dreamy sequences, or titles, it's the easiest and quickest path to a commonly needed look. Get a company's color, use it as the colorize effect, slap a logo over the top of the screen, and you've just created a winning corporate intro.
|
||||
|
||||
### 3. Dynamic Text ###
|
||||
|
||||
|
||||
|
||||
For the assistant editor, the Add Effect > Misc > Dynamic **Text** effect is worth the price of Kdenlive. With one mostly pre-set filter, you can add a running timecode burn-in to your project, which is an absolute must-have safety feature when round-tripping your footage through effects and sound.
|
||||
|
||||
The controls look more complex than they actually are.
|
||||
|
||||
|
||||
|
||||
The font settings are self-explanatory. Placement of the text is controlled by the Horizontal and Vertical Alignment settings; steer clear of the **Size** setting (it controls the size of the "canvas" upon which you are compositing the burn-in, not the size of the burn-in itself).
|
||||
|
||||
The text itself doesn't have to be timecode. From the dropdown menu, you can choose from a list of useful text, including frame count (useful for VFX, since animators work in frames), source frame rate, source dimensions, and more.
|
||||
|
||||
You are not limited to just one choice. The text field in the control panel will take whatever arbitrary text you put into it, so if you want to burn in more information than just timecode and frame rate (such as **Sc 3 - #timecode# - #meta.media.0.stream.frame_rate#**), then have at it.
|
||||
|
||||
### 4. Luminance ###
|
||||
|
||||
|
||||
|
||||
The **Add Effect > Misc > Luminance** filter is a no-options filter. Luminance does one thing and it does it well: It drops the chroma values of all pixels in an image so that they are displayed by their luma values. In simpler terms, it's a grayscale filter.
|
||||
|
||||
The nice thing about this filter is that it's quick, easy, efficient, and effective. This filter combines particularly well with other related filters (meaning that yes, I'm cheating and including three filters for one).
|
||||
|
||||
|
||||
|
||||
Combining, in this order, the **RGB Noise** for emulated grain, **Luminance** for grayscale, and **LumaLiftGainGamma** for levels can render a textured image that suggests the classic look and feel of [Kodax Tri-X][4] film.
|
||||
|
||||
### 5. Mask0mate ###
|
||||
|
||||
|
||||
Image by Footage Firm, Inc.
|
||||
|
||||
Better known as a four-point garbage mask, the **Add Effect > Alpha Manipulation > Mask0mate** tool is a quick, no-frills way to ditch parts of your frame that you don't need. There isn't much to say about it; it is what it is.
|
||||
|
||||
|
||||
|
||||
The confusing thing about the effect is that it does not imply compositing. You can pull in the edges all you want, but you won't see it unless you add the **Composite** transition to reveal what's underneath the clip (even if that's nothing). Also, use the **Invert** function for the filter to act like you think it should act (without it, the controls will probably feel backward to you).
|
||||
|
||||
### 6. Pr0file ###
|
||||
|
||||
|
||||
|
||||
The **Add Effect > Misc > Pr0file** filter is an analytical tool, not something you would actually leave on a clip for final export (unless, of course, you do). Pr0file consists of two components: the Marker, which dictates what area of the image is being analyzed, and the Graph, which displays information about the marked region.
|
||||
|
||||
Set the marker using the **X, Y, Tilt**, and **Length** controls. The graphical readout of all the relevant color channel information is displayed as a graph, superimposed over your image.
|
||||
|
||||
|
||||
|
||||
The readout displays a profile of the colors within the region marked. The result is a sort of hyper-specific vectorscope (or oscilloscope, as the case may be) that can help you zero in on problem areas during color correction, or compare regions while color matching.
|
||||
|
||||
In other editors, the way to get the same information was simply to temporarily scale your image up to the region you want to analyze, look at your readout, and then hit undo to scale back. Both ways work, but the Pr0file filter does feel a little more elegant.
|
||||
|
||||
### 7. Vectorscope ###
|
||||
|
||||
|
||||
|
||||
Kdenlive features an inbuilt vectorscope, available from the **View** menu in the main menu bar. A vectorscope is not a filter, it's just another view the footage in your Project Monitor, specifically a view of the color saturation in the current frame. If you are color correcting an image and you're not sure what colors you need to boost or counteract, looking at the vectorscope can be a huge help.
|
||||
|
||||
There are several different views available. You can render the vectorscope in traditional green monochrome (like the hardware vectorscopes you'd find in a broadcast control room), or a chromatic view (my personal preference), or subtracted from a color-wheel background, and more.
|
||||
|
||||
The vectorscope reads the entire frame, so unlike the Pr0file filter, you are not just getting a reading of one area in the frame. The result is a consolidated view of what colors are most prominent within a frame. Technically, the same sort of information can be intuited by several trial-and-error passes with color correction, or you can just leave your vectorscope open and watch the colors float along the color wheel and make adjustments accordingly.
|
||||
|
||||
Aside from how you want the vectorscope to look, there are no controls for this tool. It is a readout only.
|
||||
|
||||
### 8. Vertigo ###
|
||||
|
||||
|
||||
|
||||
There's no way around it; **Add Effect > Misc > Vertigo** is a gimmicky special effect filter. So unless you're remaking [Fear and Loathing][5] or the movie adaptation of [Dead Island][6], you probably aren't going to use it that much; however, it's one of those high-quality filters that does the exact trick you want when you happen to be looking for it.
|
||||
|
||||
The controls are simple. You can adjust how distorted the image becomes and the rate at which it distorts. The overall effect is probably more drunk or vision-quest than vertigo, but it's good.
|
||||
|
||||
|
||||
|
||||
### 9. Vignette ###
|
||||
|
||||
|
||||
|
||||
Another beautiful effect, the **Add Effect > Misc > Vignette** darkens the outer edges of the frame to provide a sort of portrait, soft-focus nouveau look. Combined with the Color Effect or the Luminance faux Tri-X trick, this can be a powerful and emotional look.
|
||||
|
||||
The softness of the border and the aspect ratio of the iris can be adjusted. The **Clear Center Size** attribute controls the size of the clear area, which has the effect of adjusting the intensity of the vignette effect.
|
||||
|
||||
|
||||
|
||||
### 10. Volume ###
|
||||
|
||||
|
||||
|
||||
I don't believe in mixing sound within the video editing application, but I do acknowledge that sometimes it's just necessary for a quick fix or, sometimes, even for a tight production schedule. And that's when the **Audio correction > Volume (Keyframable)** effect comes in handy.
|
||||
|
||||
The control panel is clunky, and no one really wants to adjust volume that way, so the effect is best when used directly in the timeline. To create a volume change, double-click the volume line over the audio clip, and then click and drag to adjust. It's that simple.
|
||||
|
||||
Should you use it? Not really. Sound mixing should be done in a sound mixing application. Will you use it? Absolutely. At some point, you'll get audio that is too loud to play as you edit, or you'll be up against a deadline without a sound engineer in sight. Use it judiciously, watch your levels, and get the show finished.
|
||||
|
||||
### Everything else ###
|
||||
|
||||
This has been 10 (OK, 13 or 14) effects and tools that Kdenlive has quietly lying around to help your edits become great. Obviously there's a lot more to Kdenlive than just these little tricks. Some are obvious, some are cliché, some are obtuse, but they're all in your toolkit. Get to know them, explore your options, and you might be surprised what a few cheap tricks will get you.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/life/15/12/10-kdenlive-tools
|
||||
|
||||
作者：[Seth Kenlon][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://opensource.com/users/seth
|
||||
[1]:https://creativecommons.org/licenses/by-sa/4.0/
|
||||
[2]:https://kdenlive.org/
|
||||
[3]:http://frei0r.dyne.org/
|
||||
[4]:http://www.kodak.com/global/en/professional/products/films/bw/triX2.jhtml
|
||||
[5]:https://en.wikipedia.org/wiki/Fear_and_Loathing_in_Las_Vegas_(film)
|
||||
[6]:https://en.wikipedia.org/wiki/Dead_Island
|
||||
@ -0,0 +1,96 @@
|
||||
5 great Raspberry Pi projects for the classroom
|
||||
================================================================================
|
||||
|
||||
|
||||
Image by : opensource.com
|
||||
|
||||
### 1. Minecraft Pi ###
|
||||
|
||||
Courtesy of the Raspberry Pi Foundation. [CC BY-SA 4.0.][1]
|
||||
|
||||
Minecraft is the favorite game of pretty much every teenager in the world—and it's one of the most creative games ever to capture the attention of young people. The version that comes with every Raspberry Pi is not only a creative thinking building game, but comes with a programming interface allowing for additional interaction with the Minecraft world through Python code.
|
||||
|
||||
Minecraft: Pi Edition is a great way for teachers to engage students with problem solving and writing code to perform tasks. You can use the Python API to build a house and have it follow you wherever you go, build a bridge wherever you walk, make it rain lava, show the temperature in the sky, and anything else your imagination can create.
|
||||
|
||||
Read more in "[Getting Started with Minecraft Pi][2]."
|
||||
|
||||
### 2. Reaction game and traffic lights ###
|
||||
|
||||
|
||||
|
||||
Courtesy of [Low Voltage Labs][3]. [CC BY-SA 4.0][1].
|
||||
|
||||
It's really easy to get started with physical computing on Raspberry Pi—just connect up LEDs and buttons to the GPIO pins, and with a few lines of code you can turn lights on and control things with button presses. Once you know the code to do the basics, it's down to your imagination as to what you do next!
|
||||
|
||||
If you know how to flash one light, you can flash three. Pick out three LEDs in traffic light colors and you can code the traffic light sequence. If you know how to use a button to a trigger an event, then you have a pedestrian crossing! Also look out for great pre-built traffic light add-ons like [PI-TRAFFIC][4], [PI-STOP][5], [Traffic HAT][6], and more.
|
||||
|
||||
It's not always about the code—this can be used as an exercise in understanding how real world systems are devised. Computational thinking is a useful skill in any walk of life.
|
||||
|
||||
|
||||
|
||||
Courtesy of the Raspberry Pi Foundation. [CC BY-SA 4.0][1].
|
||||
|
||||
Next, try wiring up two buttons and an LED and making a two-player reaction game—let the light come on after a random amount of time and see who can press the button first!
|
||||
|
||||
To learn more, check out "[GPIO Zero recipes][7]. Everything you need is in [CamJam EduKit 1][8].
|
||||
|
||||
### 3. Sense HAT Pixel Pet ###
|
||||
|
||||
The Astro Pi—an augmented Raspberry Pi—is going to space this December, but you haven't missed your chance to get your hands on the hardware. The Sense HAT is the sensor board add-on used in the Astro Pi mission and it's available for anyone to buy. You can use it for data collection, science experiments, games and more. Watch this Gurl Geek Diaries video from Raspberry Pi's Carrie Anne for a great way to get started—by bringing to life an animated pixel pet of your own design on the Sense HAT display:
|
||||
|
||||
注：youtube 视频
|
||||
<iframe width="520" height="315" frameborder="0" src="https://www.youtube.com/embed/gfRDFvEVz-w" allowfullscreen=""></iframe>
|
||||
|
||||
Learn more in "[Exploring the Sense HAT][9]."
|
||||
|
||||
### 4. Infrared bird box ###
|
||||
|
||||
|
||||
Courtesy of the Raspberry Pi Foundation. [CC BY-SA 4.0.][1]
|
||||
|
||||
A great exercise for the whole class to get involved with—place a Raspberry Pi and the NoIR camera module inside a bird box along with some infra-red lights so you can see in the dark, then stream video from the Pi over the network or on the internet. Wait for birds to nest and you can observe them without disturbing them in their habitat.
|
||||
|
||||
Learn all about infrared and the light spectrum, and how to adjust the camera focus and control the camera in software.
|
||||
|
||||
Learn more in "[Make an infrared bird box.][10]"
|
||||
|
||||
### 5. Robotics ###
|
||||
|
||||
|
||||
|
||||
Courtesy of Low Voltage Labs. [CC BY-SA 4.0][1].
|
||||
|
||||
With a Raspberry Pi and as little as a couple of motors and a motor controller board, you can build your own robot. There is a vast range of robots you can make, from basic buggies held together by sellotape and a homemade chassis, all the way to self-aware, sensor-laden metallic stallions with camera attachments driven by games controllers.
|
||||
|
||||
Learn how to control individual motors with something straightforward like the RTK Motor Controller Board (£8/$12), or dive into the new CamJam robotics kit (£17/$25) which comes with motors, wheels and a couple of sensors—great value and plenty of learning potential.
|
||||
|
||||
Alternatively, if you'd like something more hardcore, try PiBorg's [4Borg][11] (£99/$150) or [DiddyBorg][12] (£180/$273) or go the whole hog and treat yourself to their DoodleBorg Metal edition (£250/$380)—and build a mini version of their infamous [DoodleBorg tank][13] (unfortunately not for sale).
|
||||
|
||||
Check out the [CamJam robotics kit worksheets][14].
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/education/15/12/5-great-raspberry-pi-projects-classroom
|
||||
|
||||
作者：[Ben Nuttall][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://opensource.com/users/bennuttall
|
||||
[1]:https://creativecommons.org/licenses/by-sa/4.0/
|
||||
[2]:https://opensource.com/life/15/5/getting-started-minecraft-pi
|
||||
[3]:http://lowvoltagelabs.com/
|
||||
[4]:http://lowvoltagelabs.com/products/pi-traffic/
|
||||
[5]:http://4tronix.co.uk/store/index.php?rt=product/product&product_id=390
|
||||
[6]:https://ryanteck.uk/hats/1-traffichat-0635648607122.html
|
||||
[7]:http://pythonhosted.org/gpiozero/recipes/
|
||||
[8]:http://camjam.me/?page_id=236
|
||||
[9]:https://opensource.com/life/15/10/exploring-raspberry-pi-sense-hat
|
||||
[10]:https://www.raspberrypi.org/learning/infrared-bird-box/
|
||||
[11]:https://www.piborg.org/4borg
|
||||
[12]:https://www.piborg.org/diddyborg
|
||||
[13]:https://www.piborg.org/doodleborg
|
||||
[14]:http://camjam.me/?page_id=1035#worksheets
|
||||
@ -0,0 +1,94 @@
|
||||
6 creative ways to use ownCloud
|
||||
================================================================================
|
||||
|
||||
|
||||
Image by : Opensource.com
|
||||
|
||||
[ownCloud][1] is a self-hosted open source file sync and share server. Like "big boys" Dropbox, Google Drive, Box, and others, ownCloud lets you access your files, calendar, contacts, and other data. You can synchronize everything (or part of it) between your devices and share files with others. But ownCloud can do much more than its proprietary, [hosted-on-somebody-else's-computer competitors][2].
|
||||
|
||||
Let's look at six creative things ownCloud can do. Some of these are possible because ownCloud is open source, whereas others are just unique features it offers.
|
||||
|
||||
### 1. A scalable ownCloud Pi cluster ###
|
||||
|
||||
Because ownCloud is open source, you can choose between self-hosting on your own server or renting space from a provider you trust—no need to put your files at a big company that stores it who knows where. [Find some ownCloud providers here][3] or grab packages or a virtual machine for [your own server here][4].
|
||||
|
||||
|
||||
|
||||
Photo by Jörn Friedrich Dreyer. [CC BY-SA 4.0.][5]
|
||||
|
||||
The most creative things we've seen are a [Banana Pi cluster][6] and a [Raspberry Pi cluster][7]. Although ownCloud's scalability is often used to deploy to hundreds of thousands of users, some folks out there take it in a different direction, bringing multiple tiny systems together to make a super-fast ownCloud. Kudos!
|
||||
|
||||
### 2. Keep your passwords synced ###
|
||||
|
||||
To make ownCloud easier to extend, we have made it extremely modular and have an [ownCloud app store][8]. There you can find things like music and video players, calendars, contacts, productivity apps, games, a sketching app, and much more.
|
||||
|
||||
Picking only one app from the almost 200 available is hard, but managing passwords is certainly a unique feature. There are no less than three apps providing this functionality: [Passwords][9], [Secure Container][10], and [Passman][11].
|
||||
|
||||
|
||||
|
||||
### 3. Store your files where you want ###
|
||||
|
||||
External storage allows you to hook your existing data storage into ownCloud, letting you to access files stored on FTP, WebDAV, Amazon S3, and even Dropbox and Google Drive through one interface.
|
||||
|
||||
注：youtube 视频
|
||||
<iframe width="520" height="315" frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/uezzFDRnoPY"></iframe>
|
||||
|
||||
The "big boys" like to create their own little walled gardens—Box user can only collaborate with other Box users; and if you want to share your files from Google Drive, your mate needs a Google account or they can't do much. With ownCloud's external storage, you can break these barriers.
|
||||
|
||||
A very creative solution is adding Google Drive and Dropbox as external storage. You can work with files on both seamlessly and share them with others through a simple link—no account needed to work with you!
|
||||
|
||||
### 4. Get files uploaded ###
|
||||
|
||||
Because ownCloud is open source, people contribute interesting features without being limited by corporate requirements. Our contributors have always cared about security and privacy, so ownCloud introduced features such as protecting a public link with a password and setting an expire date [years before anybody else did][12].
|
||||
|
||||
Today, ownCloud has the ability to configure a shared link as read-write, which means visitors can seamlessly edit the files you share with them (protected with a password or not) or upload new files to your server without being forced to sign up to another web service that wants their private data.
|
||||
|
||||
注：youtube 视频
|
||||
<iframe width="520" height="315" frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/3GSppxEhmZY"></iframe>
|
||||
|
||||
This is great for when people want to share a large file with you. Rather than having to upload it to a third-party site, send you a link, and make you go there and download it (often requiring a login), they can just upload it to a shared folder you provide, and you can get to work right away.
|
||||
|
||||
### 5. Get free secure storage ###
|
||||
|
||||
We already talked about how many of our contributors care about security and privacy. That's why ownCloud has an app that can encrypt and decrypt stored data.
|
||||
|
||||
Using ownCloud to store your files on Dropbox or Google Drive defeats the whole idea of retaking control of your data and keeping it private. The Encryption app changes that. By encrypting data before sending it to these providers and decrypting it upon retrieval, your data is safe as kittens.
|
||||
|
||||
### 6. Share your files and stay in control ###
|
||||
|
||||
As an open source project, ownCloud has no stake in building walled gardens. Enter Federated Cloud Sharing: a protocol [developed and published by ownCloud][13] that enables different file sync and share servers to talk to one another and exchange files securely. Federated Cloud Sharing has an interesting history. [Twenty-two German universities][14] decided to build a huge cloud for their 500,000 students. But as each university wanted to stay in control of the data of their own students, a creative solution was needed: Federated Cloud Sharing. The solution now connects all these universities so the students can seamlessly work together. At the same time, the system administrators at each university stay in control of the files their students have created and can apply policies, such as storage restrictions, or limitations on what, with whom, and how files can be shared.
|
||||
|
||||
注：youtube 视频
|
||||
<iframe width="520" height="315" frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/9-JEmlH2DEg"></iframe>
|
||||
|
||||
And this awesome technology isn't limited to German universities: Every ownCloud user can find their [Federated Cloud ID][15] in their user settings and share it with others.
|
||||
|
||||
So there you have it. Six ways ownCloud enables people to do special and unique things, all made possible because it is open source and designed to help you liberate your data.
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/life/15/12/6-creative-ways-use-owncloud
|
||||
|
||||
作者：[Jos Poortvliet][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://opensource.com/users/jospoortvliet
|
||||
[1]:https://owncloud.com/
|
||||
[2]:https://blogs.fsfe.org/mk/new-stickers-and-leaflets-no-cloud-and-e-mail-self-defense/
|
||||
[3]:https://owncloud.org/providers
|
||||
[4]:https://owncloud.org/install/#instructions-server
|
||||
[5]:https://creativecommons.org/licenses/by-sa/4.0/
|
||||
[6]:http://www.owncluster.de/
|
||||
[7]:https://christopherjcoleman.wordpress.com/2013/01/05/host-your-owncloud-on-a-raspberry-pi-cluster/
|
||||
[8]:https://apps.owncloud.com/
|
||||
[9]:https://apps.owncloud.com/content/show.php/Passwords?content=170480
|
||||
[10]:https://apps.owncloud.com/content/show.php/Secure+Container?content=167268
|
||||
[11]:https://apps.owncloud.com/content/show.php/Passman?content=166285
|
||||
[12]:https://owncloud.com/owncloud45-community/
|
||||
[13]:http://karlitschek.de/2015/08/announcing-the-draft-federated-cloud-sharing-api/
|
||||
[14]:https://owncloud.com/customer/sciebo/
|
||||
[15]:https://owncloud.org/federation/
|
||||
@ -0,0 +1,79 @@
|
||||
6 useful LibreOffice extensions
|
||||
================================================================================
|
||||
|
||||
|
||||
Image by : Opensource.com
|
||||
|
||||
LibreOffice is the best free office suite around, and as such has been adopted by all major Linux distributions. Although LibreOffice is already packed with features, it can be extended by using specific add-ons, called extensions.
|
||||
|
||||
The main LibreOffice extensions website is [extensions.libreoffice.org][1]. Extensions are tools that can be added or removed independently from the main installation, and may add new functionality or make existing functionality easier to use.
|
||||
|
||||
### 1. MultiFormatSave ###
|
||||
|
||||
MultiFormatSave lets users save a document in the OpenDocument, Microsoft Office (old and new), and/or PDF formats simultaneously, according to user settings. This extension is extremely useful during the migration from Microsoft Office document formats to the [Open Document Format][2] standard, because it offers the option to save in both flavors: ODF for interoperability, and Microsoft Office for compatibility with all users sticking to legacy formats. This makes the migration process softer, and easier to administer.
|
||||
|
||||
**[Download MultiFormatSave][3]**
|
||||
|
||||
|
||||
|
||||
### 2. Alternative dialog Find & Replace for Writer (AltSearch) ###
|
||||
|
||||
This extension adds many new features to Writer's find & replace function: searched or replaced text can contain one or more paragraphs; multiple search and replacement in one step; searching: Bookmarks, Notes, Text fields, Cross-references and Reference marks to their content, name or mark and their inserting; searching and inserting Footnote and Endnote; searching object of Table, Pictures and Text frames according to their name; searching out manual page and column break and their set up or deactivation; and searching similarly formatted text, according to cursor point. It is also possible to save and load search and replacement parameters, and execute the batch on several opened documents at the same time.
|
||||
|
||||
**[Download Alternative dialog Find & Replace for Writer (AltSearch)][4]**
|
||||
|
||||
|
||||
|
||||
### 3. Pepito Cleaner ###
|
||||
|
||||
Pepito Cleaner is an extension of LibreOffice created to quickly resolve the most common formatting mistakes of old scans, PDF imports, and every digital text file. By clicking the Pepito Cleaner icon on the LibreOffice toolbar, users will open a window that will analyze the document and show the results broken down by category. This is extremely useful when converting PDF documents to ODF, as it cleans all the cruft left in place by the automatic process.
|
||||
|
||||
**[Download Pepito Cleaner][5]**
|
||||
|
||||
|
||||
|
||||
### 4. ImpressRunner ###
|
||||
|
||||
Impress Runner is a simple extension that transforms an [Impress][6] presentation into an auto-running file. The extension adds two icons, to set and remove the autostart function, which can also be added manually by editing the File | Properties | Custom Properties menu, and adding the term autostart in one of the first four text fields. This extension is especially useful for booths at conferences and events, where the slides are supposed to run unattended.
|
||||
|
||||
**[Download ImpressRunner][7]**
|
||||
|
||||
### 5. Export as Images ###
|
||||
|
||||
The Export as Images extension adds a File menu entry export as Images... in Impress and [Draw][8], to export all slides or pages as images in JPG, PNG, GIF, BMP, and TIFF format, and allows users to choose a file name for exported images, the image size, and other parameters.
|
||||
|
||||
**[Download Export as Images][9]**
|
||||
|
||||
|
||||
|
||||
### 6. Anaphraseus ###
|
||||
|
||||
Anaphraseus is a CAT (Computer-Aided Translation) tool for creating, managing, and using bilingual Translation Memories. Anaphraseus is a LibreOffice macro set available as an extension or a standalone document. Originally, Anaphraseus was developed to work with the Wordfast format, but it can also export and import files in TMX format. Anaphraseus main features are: text segmentation, fuzzy search in Translation Memory, terminology recognition, and TMX Export/Import (OmegaT translation memory format).
|
||||
|
||||
**[Download Anaphraseus][10]**
|
||||
|
||||
|
||||
|
||||
Do you have a favorite LibreOffice extension to recommend? Let us know about it in the comments.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/business/15/12/6-useful-libreoffice-extensions
|
||||
|
||||
作者：[Italo Vignoli][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://opensource.com/users/italovignoli
|
||||
[1]:http://extensions.libreoffice.org/
|
||||
[2]:http://www.opendocumentformat.org/
|
||||
[3]:http://extensions.libreoffice.org/extension-center/multisave-1
|
||||
[4]:http://extensions.libreoffice.org/extension-center/alternative-dialog-find-replace-for-writer
|
||||
[5]:http://pepitoweb.altervista.org/pepito_cleaner/index.php
|
||||
[6]:https://www.libreoffice.org/discover/impress/
|
||||
[7]:http://extensions.libreoffice.org/extension-center/impressrunner
|
||||
[8]:https://www.libreoffice.org/discover/draw/
|
||||
[9]:http://extensions.libreoffice.org/extension-center/export-as-images
|
||||
[10]:http://anaphraseus.sourceforge.net/
|
||||
@ -0,0 +1,79 @@
|
||||
Top 5 open source community metrics to track
|
||||
================================================================================
|
||||
|
||||
|
||||
So you decided to use metrics to track your free, open source software (FOSS) community. Now comes the big question: Which metrics should I be tracking?
|
||||
|
||||
To answer this question, you must have an idea of what information you need. For example, you may want to know about the sustainability of the project community. How quickly does the community react to problems? How is the community attracting, retaining, or losing contributors? Once you decide which information you need, you can figure out which traces of community activity are available to provide it. Fortunately, FOSS projects following an open development model tend to leave loads of public data in their software development repositories, which can be analyzed to gather useful data.
|
||||
|
||||
In this article, I'll introduce metrics that help provide a multi-faceted view of your project community.
|
||||
|
||||
### 1. Activity ###
|
||||
|
||||
The overall activity of the community and how it evolves over time is a useful metric for all open source communities. Activity provides a first view of how much the community is doing, and can be used to track different kinds of activity. For example, the number of commits gives a first idea about the volume of the development effort. The number of tickets opened provides insight into how many bugs are reported or new features are proposed. The number of messages in mailing lists or posts in forums gives an idea of how much discussion is being held in public.
|
||||
|
||||
|
||||
|
||||
Number of commits and number of merged changes after code review in the OpenStack project, as found in the [OpenStack Activity Dashboard][1]. Evolution over time (weekly data).
|
||||
|
||||
### 2. Size ###
|
||||
|
||||
The size of the community is the number of people participating in it, but, depending on the kind of participation, size numbers may vary. Usually you're interested in active contributors, which is good news. Active people may leave traces in the repositories of the project, which means you can count contributors who are active in producing code by looking at the **Author** field in git repositories, or count people participating in the resolution of tickets by looking at who is contributing to them.
|
||||
|
||||
This basic idea of activity" (somebody did something) can be extended in many ways. One common way to track activity is to look at how many people did a sizable chunk of the activity. Generally most of a project's code contributions, for example, are from a small fraction of the people in the project's community. Knowing about that fraction helps provide an idea of the core group (i.e., the people who help lead the community).
|
||||
|
||||
|
||||
|
||||
Number of authors and number of posters in mailing lists in the Xen project, as found in the [Xen Project Development Dashboard][2]. Evolution over time (monthly data).
|
||||
|
||||
### 3. Performance ###
|
||||
|
||||
So far, I have focused on measuring quantities of activities and contributors. You also can analyze how processes and people are performing. For example, you can measure how long processes take to finish. Time to resolve or close tickets shows how the project is reacting to new information that requires action, such as fixing a reported bug or implementing a requested new feature. Time spent in code review—from the moment when a change to the code is proposed to the moment it is accepted—shows how long upgrading a proposed change to the quality standards expected by the community takes.
|
||||
|
||||
Other metrics deal with how well the project is coping with pending work, such as the ratio of new to closed tickets, or the backlog of still non-completed code reviews. Those parameters tell us, for example, whether or not the resources put into solving issues is enough.
|
||||
|
||||
|
||||
|
||||
Ratio of tickets closed by tickets opened, and ratio of change proposals accepted or abandoned by new change proposals per quarter. OpenStack project, as shown in the [OpenStack Development Report, 2015-Q3][3] (PDF).
|
||||
|
||||
### 4. Demographics ###
|
||||
|
||||
Communities change as contributors move in and out. Depending on how people enter and leave a community over time, the age (time since members joined the community) of the community varies. The [community aging chart][4] nicely illustrates these exchanges over time. The chart is structured as a set of horizontal bars, two per "generation" of people joining the community. For each generation, the attracted bar shows how many new people joined the community during the corresponding period of time. The retained bar shows how many people are still active in the community.
|
||||
|
||||
The relationship between the two bars for each generation is the retention rate: the fraction of people of that generation who are still in the project. The complete set of attracted bars show how attractive the project was in the past. And the complete set of the retention bars shows the current age structure of the community.
|
||||
|
||||
|
||||
|
||||
Community aging chart for the Eclipse community, as shown in the [Eclipse Development Dashboard][5]. Generations are defined every six months.
|
||||
|
||||
### 5. Diversity ###
|
||||
|
||||
Diversity is an important factor in the resiliency of communities. In general, the more diverse communities are—in terms of people or organizations participating—the more resilient they are. For example, when a company decides to leave a FOSS community, the potential problems the departure may cause are much smaller if its employees were contributing 5% of the work rather than 85%.
|
||||
|
||||
The [Pony Factor][6], a term defined by [Daniel Gruno][7] for the minimum number of developers performing 50% of the commits. Based on the Pony Factor, the Elephant Factor is the minimum number of companies whose employees perform 50% of the commits. Both numbers provide an indication of how many people or companies the community depends on.
|
||||
|
||||
|
||||
|
||||
Pony and Elephant Factor for several FOSS projects in the area of cloud computing, as presented in [The quantitative state of the open cloud 2015][8] (slides).
|
||||
|
||||
There are many other metrics to help measure a community. When determing which metrics to collect, think about the goals of your community, and which metrics will help you reach them.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/business/15/12/top-5-open-source-community-metrics-track
|
||||
|
||||
作者：[Jesus M. Gonzalez-Barahona][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://opensource.com/users/jgbarah
|
||||
[1]:http://activity.openstack.org/
|
||||
[2]:http://projects.bitergia.com/xen-project-dashboard/
|
||||
[3]:http://activity.openstack.org/dash/reports/2015-q3/pdf/2015-q3_OpenStack_report.pdf
|
||||
[4]:http://radar.oreilly.com/2014/10/measure-your-open-source-communitys-age-to-keep-it-healthy.html
|
||||
[5]:http://dashboard.eclipse.org/demographics.html
|
||||
[6]:https://ke4qqq.wordpress.com/2015/02/08/pony-factor-math/
|
||||
[7]:https://twitter.com/humbedooh
|
||||
[8]:https://speakerdeck.com/jgbarah/the-quantitative-state-of-the-open-cloud-2015-edition
|
||||
@ -1,159 +0,0 @@
|
||||
How to Install and Configure Multihomed ISC DHCP Server on Debian Linux
|
||||
================================================================================
|
||||
Dynamic Host Control Protocol (DHCP) offers an expedited method for network administrators to provide network layer addressing to hosts on a constantly changing, or dynamic, network. One of the most common server utilities to offer DHCP functionality is ISC DHCP Server. The goal of this service is to provide hosts with the necessary network information to be able to communicate on the networks in which the host is connected. Information that is typically served by this service can include: DNS server information, network address (IP), subnet mask, default gateway information, hostname, and much more.
|
||||
|
||||
This tutorial will cover ISC-DHCP-Server version 4.2.4 on a Debian 7.7 server that will manage multiple virtual local area networks (VLAN) but can very easily be applied to a single network setup as well.
|
||||
|
||||
The test network that this server was setup on has traditionally relied on a Cisco router to manage the DHCP address leases. The network currently has 12 VLANs needing to be managed by one centralized server. By moving this responsibility to a dedicated server, the router can regain resources for more important tasks such as routing, access control lists, traffic inspection, and network address translation.
|
||||
|
||||
The other benefit to moving DHCP to a dedicated server will, in a later guide, involve setting up Dynamic Domain Name Service (DDNS) so that new host’s host-names will be added to the DNS system when the host requests a DHCP address from the server.
|
||||
|
||||
### Step 1: Installing and Configuring ISC DHCP Server ###
|
||||
|
||||
1. To start the process of creating this multi-homed server, the ISC software needs to be installed via the Debian repositories using the ‘apt‘ utility. As with all tutorials, root or sudo access is assumed. Please make the appropriate modifications to the following commands.
|
||||
|
||||
# apt-get install isc-dhcp-server [Installs the ISC DHCP Server software]
|
||||
# dpkg --get-selections isc-dhcp-server [Confirms successful installation]
|
||||
# dpkg -s isc-dhcp-server [Alternative confirmation of installation]
|
||||
|
||||
|
||||
|
||||
2. Now that the server software is confirmed installed, it is now necessary to configure the server with the network information that it will need to hand out. At the bare minimum, the administrator needs to know the following information for a basic DHCP scope:
|
||||
|
||||
- The network addresses
|
||||
- The subnet masks
|
||||
- The range of addresses to be dynamically assigned
|
||||
|
||||
Other useful information to have the server dynamically assign includes:
|
||||
|
||||
- Default gateway
|
||||
- DNS server IP addresses
|
||||
- The Domain Name
|
||||
- Host name
|
||||
- Network Broadcast addresses
|
||||
|
||||
These are merely a few of the many options that the ISC DHCP server can handle. To get a complete list as well as a description of each option, enter the following command after installing the package:
|
||||
|
||||
# man dhcpd.conf
|
||||
|
||||
3. Once the administrator has concluded all the necessary information for this server to hand out it is time to configure the DHCP server as well as the necessary pools. Before creating any pools or server configurations though, the DHCP service must be configured to listen on one of the server’s interfaces.
|
||||
|
||||
On this particular server, a NIC team has been setup and DHCP will listen on the teamed interfaces which were given the name `'bond0'`. Be sure to make the appropriate changes given the server and environment in which everything is being configured. The defaults in this file are okay for this tutorial.
|
||||
|
||||
|
||||
|
||||
This line will instruct the DHCP service to listen for DHCP traffic on the specified interface(s). At this point, it is time to modify the main configuration file to enable the DHCP pools on the necessary networks. The main configuration file is located at /etc/dhcp/dhcpd.conf. Open the file with a text editor to begin:
|
||||
|
||||
# nano /etc/dhcp/dhcpd.conf
|
||||
|
||||
This file is the configuration for the DHCP server specific options as well as all of the pools/hosts one wishes to configure. The top of the file starts of with a ‘ddns-update-style‘ clause and for this tutorial it will remain set to ‘none‘ however in a future article, Dynamic DNS will be covered and ISC-DHCP-Server will be integrated with BIND9 to enable host name to IP address updates.
|
||||
|
||||
4. The next section is typically the area where and administrator can configure global network settings such as the DNS domain name, default lease time for IP addresses, subnet-masks, and much more. Again to know more about all the options be sure to read the man page for the dhcpd.conf file.
|
||||
|
||||
# man dhcpd.conf
|
||||
|
||||
For this server install, there were a couple of global network options that were configured at the top of the configuration file so that they wouldn’t have to be implemented in every single pool created.
|
||||
|
||||
|
||||
|
||||
Lets take a moment to explain some of these options. While they are configured globally in this example, all of them can be configured on a per pool basis as well.
|
||||
|
||||
- option domain-name “comptech.local”; – All hosts that this DHCP server hosts, will be a member of the DNS domain name “comptech.local”
|
||||
- option domain-name-servers 172.27.10.6; DHCP will hand out DNS server IP of 172.27.10.6 to all of the hosts on all of the networks it is configured to host.
|
||||
- option subnet-mask 255.255.255.0; – The subnet mask handed out to every network will be a 255.255.255.0 or a /24
|
||||
- default-lease-time 3600; – This is the time in seconds that a lease will automatically be valid. The host can re-request the same lease if time runs out or if the host is done with the lease, they can hand the address back early.
|
||||
- max-lease-time 86400; – This is the maximum amount of time in seconds a lease can be held by a host.
|
||||
- ping-check true; – This is an extra test to ensure that the address the server wants to assign out isn’t in use by another host on the network already.
|
||||
- ping-timeout; – This is how long in second the server will wait for a response to a ping before assuming the address isn’t in use.
|
||||
- ignore client-updates; For now this option is irrelevant since DDNS has been disabled earlier in the configuration file but when DDNS is operating, this option will ignore a hosts to request to update its host-name in DNS.
|
||||
|
||||
5. The next line in this file is the authoritative DHCP server line. This line means that if this server is to be the server that hands out addresses for the networks configured in this file, then uncomment the authoritative stanza.
|
||||
|
||||
This server will be the only authority on all the networks it manages so the global authoritative stanza was un-commented by removing the ‘#’ in front of the keyword authoritative.
|
||||
|
||||
|
||||
Enable ISC Authoritative
|
||||
|
||||
By default the server is assumed to NOT be an authority on the network. The rationale behind this is security. If someone unknowingly configures the DHCP server improperly or on a network they shouldn’t, it could cause serious connectivity issues. This line can also be used on a per network basis. This means that if the server is not the entire network’s DHCP server, the authoritative line can instead be used on a per network basis rather than in the global configuration as seen in the above screen-shot.
|
||||
|
||||
6. The next step is to configure all of the DHCP pools/networks that this server will manage. For brevities sake, this guide will only walk through one of the pools configured. The administrator will need to have gathered all of the necessary network information (ie domain name, network addresses, how many addresses can be handed out, etc).
|
||||
|
||||
For this pool the following information was obtained from the network administrator: network id of 172.27.60.0, subnet mask of 255.255.255.0 or a /24, the default gateway for the subnet is 172.27.60.1, and a broadcast address of 172.27.60.255.
|
||||
This information is important to building the appropriate network stanza in the dhcpd.conf file. Without further ado, let’s open the configuration file again using a text editor and then add the new network to the server. This must be done with root/sudo!
|
||||
|
||||
# nano /etc/dhcp/dhcpd.conf
|
||||
|
||||
|
||||
Configure DHCP Pools and Networks
|
||||
|
||||
This is the sample created to hand out IP addresses to a network that is used for the creation of VMWare virtual practice servers. The first line indicates the network as well as the subnet mask for that network. Then inside the brackets are all the options that the DHCP server should provide to hosts on this network.
|
||||
|
||||
The first stanza, range 172.27.60.50 172.27.60.254;, is the range of dynamically assignable addresses that the DHCP server can hand out to hosts on this network. Notice that the first 49 addresses aren’t in the pool and can be assigned statically to hosts if needed.
|
||||
|
||||
The second stanza, option routers 172.27.60.1; , hands out the default gateway address for all hosts on this network.
|
||||
|
||||
The last stanza, option broadcast-address 172.27.60.255;, indicates what the network’s broadcast address. This address SHOULD NOT be a part of the range stanza as the broadcast address can’t be assigned to a host.
|
||||
|
||||
Some pointers, be sure to always end the option lines with a semi-colon (;) and always make sure each network created is enclosed in curly braces { }.
|
||||
|
||||
7. If there are more networks to create, continue creating them with their appropriate options and then save the text file. Once all configurations have been completed, the ISC-DHCP-Server process will need to be restarted in order to apply the new changes. This can be accomplished with the following command:
|
||||
|
||||
# service isc-dhcp-server restart
|
||||
|
||||
This will restart the DHCP service and then the administrator can check to see if the server is ready for DHCP requests several different ways. The easiest is to simply see if the server is listening on port 67 via the [lsof command][1]:
|
||||
|
||||
# lsof -i :67
|
||||
|
||||
|
||||
Check DHCP Listening Port
|
||||
|
||||
This output indicates that the DHCPD (DHCP Server daemon) is running and listening on port 67. Port 67 in this output was actually converted to ‘bootps‘ due to a port number mapping for port 67 in /etc/services file.
|
||||
|
||||
This is very common on most systems. At this point, the server should be ready for network connectivity and can be confirmed by connecting a machine to the network and having it request a DHCP address from the server.
|
||||
|
||||
### Step 2: Testing Client Connectivity ###
|
||||
|
||||
8. Most systems now-a-days are using Network Manager to maintain network connections and as such the device should be pre-configured to pull DHCP when the interface is active.
|
||||
|
||||
However on machines that aren’t using Network Manager, it may be necessary to manually attempt to pull a DHCP address. The next few steps will show how to do this as well as how to see whether the server is handing out addresses.
|
||||
|
||||
The ‘[ifconfig][2]‘ utility can be used to check an interface’s configuration. The machine used to test the DHCP server only has one network adapter and it is called ‘eth0‘.
|
||||
|
||||
# ifconfig eth0
|
||||
|
||||
|
||||
Check Network Interface IP Address
|
||||
|
||||
From this output, this machine currently doesn’t have an IPv4 address, great! Let’s instruct this machine to reach out to the DHCP server and request an address. This machine has the DHCP client utility known as ‘dhclient‘ installed. The DHCP client utility may very from system to system.
|
||||
|
||||
# dhclient eth0
|
||||
|
||||
|
||||
Request IP Address from DHCP
|
||||
|
||||
Now the `'inet addr:'` field shows an IPv4 address that falls within the scope of what was configured for the 172.27.60.0 network. Also notice that the proper broadcast address was handed out as well as subnet mask for this network.
|
||||
|
||||
Things are looking promising but let’s check the server to see if it was actually the place where this machine received this new IP address. To accomplish this task, the server’s system log file will be consulted. While the entire log file may contain hundreds of thousands of entries, only a few are necessary for confirming that the server is working properly. Rather than using a full text editor, this time a utility known as ‘tail‘ will be used to only show the last few lines of the log file.
|
||||
|
||||
# tail /var/log/syslog
|
||||
|
||||
|
||||
Check DHCP Logs
|
||||
|
||||
Voila! The server recorded handing out an address to this host (HRTDEBXENSRV). It is a safe assumption at this point that the server is working as intended and handing out the appropriate addresses for the networks that it is an authority. At this point the DHCP server is up and running. Configure the other networks, troubleshoot, and secure as necessary.
|
||||
|
||||
Enjoy the newly functioning ISC-DHCP-Server and tune in later for more Debian tutorials. In the not too distant future there will be an article on Bind9 and DDNS that will tie into this article.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.tecmint.com/install-and-configure-multihomed-isc-dhcp-server-on-debian-linux/
|
||||
|
||||
作者：[Rob Turner][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.tecmint.com/author/robturner/
|
||||
[1]:http://www.tecmint.com/10-lsof-command-examples-in-linux/
|
||||
[2]:http://www.tecmint.com/ifconfig-command-examples/
|
||||
@ -1,429 +0,0 @@
|
||||
Installation Guide for Puppet on Ubuntu 15.04
|
||||
================================================================================
|
||||
Hi everyone, today in this article we'll learn how to install puppet to manage your server infrastructure running ubuntu 15.04. Puppet is an open source software configuration management tool which is developed and maintained by Puppet Labs that allows us to automate the provisioning, configuration and management of a server infrastructure. Whether we're managing just a few servers or thousands of physical and virtual machines to orchestration and reporting, puppet automates tasks that system administrators often do manually which frees up time and mental space so sysadmins can work on improving other aspects of your overall setup. It ensures consistency, reliability and stability of the automated jobs processed. It facilitates closer collaboration between sysadmins and developers, enabling more efficient delivery of cleaner, better-designed code. Puppet is available in two solutions configuration management and data center automation. They are **puppet open source and puppet enterprise**. Puppet open source is a flexible, customizable solution available under the Apache 2.0 license, designed to help system administrators automate the many repetitive tasks they regularly perform. Whereas puppet enterprise edition is a proven commercial solution for diverse enterprise IT environments which lets us get all the benefits of open source puppet, plus puppet apps, commercial-only enhancements, supported modules and integrations, and the assurance of a fully supported platform. Puppet uses SSL certificates to authenticate communication between master and agent nodes.
|
||||
|
||||
In this tutorial, we will cover how to install open source puppet in an agent and master setup running ubuntu 15.04 linux distribution. Here, Puppet master is a server from where all the configurations will be controlled and managed and all our remaining servers will be puppet agent nodes, which is configured according to the configuration of puppet master server. Here are some easy steps to install and configure puppet to manage our server infrastructure running Ubuntu 15.04.
|
||||
|
||||
### 1. Setting up Hosts ###
|
||||
|
||||
In this tutorial, we'll use two machines, one as puppet master server and another as puppet node agent both running ubuntu 15.04 "Vivid Vervet" in both the machines. Here is the infrastructure of the server that we're gonna use for this tutorial.
|
||||
|
||||
puppet master server with IP 44.55.88.6 and hostname : puppetmaster
|
||||
puppet node agent with IP 45.55.86.39 and hostname : puppetnode
|
||||
|
||||
Now we'll add the entry of the machines to /etc/hosts on both machines node agent and master server.
|
||||
|
||||
# nano /etc/hosts
|
||||
|
||||
45.55.88.6 puppetmaster.example.com puppetmaster
|
||||
45.55.86.39 puppetnode.example.com puppetnode
|
||||
|
||||
Please note that the Puppet Master server must be reachable on port 8140. So, we'll need to open port 8140 in it.
|
||||
|
||||
### 2. Updating Time with NTP ###
|
||||
|
||||
As puppet nodes needs to maintain accurate system time to avoid problems when it issues agent certificates. Certificates can appear to be expired if there is time difference, the time of the both the master and the node agent must be synced with each other. To sync the time, we'll update the time with NTP. To do so, here's the command below that we need to run on both master and node agent.
|
||||
|
||||
# ntpdate pool.ntp.org
|
||||
|
||||
17 Jun 00:17:08 ntpdate[882]: adjust time server 66.175.209.17 offset -0.001938 sec
|
||||
|
||||
Now, we'll update our local repository index and install ntp as follows.
|
||||
|
||||
# apt-get update && sudo apt-get -y install ntp ; service ntp restart
|
||||
|
||||
### 3. Puppet Master Package Installation ###
|
||||
|
||||
There are many ways to install open source puppet. In this tutorial, we'll download and install a debian binary package named as **puppetlabs-release** packaged by the Puppet Labs which will add the source of the **puppetmaster-passenger** package. The puppetmaster-passenger includes the puppet master with apache web server. So, we'll now download the Puppet Labs package.
|
||||
|
||||
# cd /tmp/
|
||||
# wget https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
|
||||
|
||||
--2015-06-17 00:19:26-- https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
|
||||
Resolving apt.puppetlabs.com (apt.puppetlabs.com)... 192.155.89.90, 2600:3c03::f03c:91ff:fedb:6b1d
|
||||
Connecting to apt.puppetlabs.com (apt.puppetlabs.com)|192.155.89.90|:443... connected.
|
||||
HTTP request sent, awaiting response... 200 OK
|
||||
Length: 7384 (7.2K) [application/x-debian-package]
|
||||
Saving to: ‘puppetlabs-release-trusty.deb’
|
||||
|
||||
puppetlabs-release-tr 100%[===========================>] 7.21K --.-KB/s in 0.06s
|
||||
|
||||
2015-06-17 00:19:26 (130 KB/s) - ‘puppetlabs-release-trusty.deb’ saved [7384/7384]
|
||||
|
||||
After the download has been completed, we'll wanna install the package.
|
||||
|
||||
# dpkg -i puppetlabs-release-trusty.deb
|
||||
|
||||
Selecting previously unselected package puppetlabs-release.
|
||||
(Reading database ... 85899 files and directories currently installed.)
|
||||
Preparing to unpack puppetlabs-release-trusty.deb ...
|
||||
Unpacking puppetlabs-release (1.0-11) ...
|
||||
Setting up puppetlabs-release (1.0-11) ...
|
||||
|
||||
Then, we'll update the local respository index with the server using apt package manager.
|
||||
|
||||
# apt-get update
|
||||
|
||||
Then, we'll install the puppetmaster-passenger package by running the below command.
|
||||
|
||||
# apt-get install puppetmaster-passenger
|
||||
|
||||
**Note**: While installing we may get an error **Warning: Setting templatedir is deprecated. See http://links.puppetlabs.com/env-settings-deprecations (at /usr/lib/ruby/vendor_ruby/puppet/settings.rb:1139:in `issue_deprecation_warning')** but we no need to worry, we'll just simply ignore this as it says that the templatedir is deprecated so, we'll simply disbale that setting in the configuration. :)
|
||||
|
||||
To check whether puppetmaster has been installed successfully in our Master server not not, we'll gonna try to check its version.
|
||||
|
||||
# puppet --version
|
||||
|
||||
3.8.1
|
||||
|
||||
We have successfully installed puppet master package in our puppet master box. As we are using passenger with apache, the puppet master process is controlled by apache server, that means it runs when apache is running.
|
||||
|
||||
Before continuing, we'll need to stop the Puppet master by stopping the apache2 service.
|
||||
|
||||
# systemctl stop apache2
|
||||
|
||||
### 4. Master version lock with Apt ###
|
||||
|
||||
As We have puppet version as 3.8.1, we need to lock the puppet version update as this will mess up the configurations while updating the puppet. So, we'll use apt's locking feature for that. To do so, we'll need to create a new file **/etc/apt/preferences.d/00-puppet.pref** using our favorite text editor.
|
||||
|
||||
# nano /etc/apt/preferences.d/00-puppet.pref
|
||||
|
||||
Then, we'll gonna add the entries in the newly created file as:
|
||||
|
||||
# /etc/apt/preferences.d/00-puppet.pref
|
||||
Package: puppet puppet-common puppetmaster-passenger
|
||||
Pin: version 3.8*
|
||||
Pin-Priority: 501
|
||||
|
||||
Now, it will not update the puppet while running updates in the system.
|
||||
|
||||
### 5. Configuring Puppet Config ###
|
||||
|
||||
Puppet master acts as a certificate authority and must generate its own certificates which is used to sign agent certificate requests. First of all, we'll need to remove any existing SSL certificates that were created during the installation of package. The default location of puppet's SSL certificates is /var/lib/puppet/ssl. So, we'll remove the entire ssl directory using rm command.
|
||||
|
||||
# rm -rf /var/lib/puppet/ssl
|
||||
|
||||
Then, we'll configure the certificate. While creating the puppet master's certificate, we need to include every DNS name at which agent nodes can contact the master at. So, we'll edit the master's puppet.conf using our favorite text editor.
|
||||
|
||||
# nano /etc/puppet/puppet.conf
|
||||
|
||||
The output seems as shown below.
|
||||
|
||||
[main]
|
||||
logdir=/var/log/puppet
|
||||
vardir=/var/lib/puppet
|
||||
ssldir=/var/lib/puppet/ssl
|
||||
rundir=/var/run/puppet
|
||||
factpath=$vardir/lib/facter
|
||||
templatedir=$confdir/templates
|
||||
|
||||
[master]
|
||||
# These are needed when the puppetmaster is run by passenger
|
||||
# and can safely be removed if webrick is used.
|
||||
ssl_client_header = SSL_CLIENT_S_DN
|
||||
ssl_client_verify_header = SSL_CLIENT_VERIFY
|
||||
|
||||
Here, we'll need to comment the templatedir line to disable the setting as it has been already depreciated. After that, we'll add the following line at the end of the file under [main].
|
||||
|
||||
server = puppetmaster
|
||||
environment = production
|
||||
runinterval = 1h
|
||||
strict_variables = true
|
||||
certname = puppetmaster
|
||||
dns_alt_names = puppetmaster, puppetmaster.example.com
|
||||
|
||||
This configuration file has many options which might be useful in order to setup own configuration. A full description of the file is available at Puppet Labs [Main Config File (puppet.conf)][1].
|
||||
|
||||
After editing the file, we'll wanna save that and exit.
|
||||
|
||||
Now, we'll gonna generate a new CA certificates by running the following command.
|
||||
|
||||
# puppet master --verbose --no-daemonize
|
||||
|
||||
Info: Creating a new SSL key for ca
|
||||
Info: Creating a new SSL certificate request for ca
|
||||
Info: Certificate Request fingerprint (SHA256): F6:2F:69:89:BA:A5:5E:FF:7F:94:15:6B:A7:C4:20:CE:23:C7:E3:C9:63:53:E0:F2:76:D7:2E:E0:BF:BD:A6:78
|
||||
...
|
||||
Notice: puppetmaster has a waiting certificate request
|
||||
Notice: Signed certificate request for puppetmaster
|
||||
Notice: Removing file Puppet::SSL::CertificateRequest puppetmaster at '/var/lib/puppet/ssl/ca/requests/puppetmaster.pem'
|
||||
Notice: Removing file Puppet::SSL::CertificateRequest puppetmaster at '/var/lib/puppet/ssl/certificate_requests/puppetmaster.pem'
|
||||
Notice: Starting Puppet master version 3.8.1
|
||||
^CNotice: Caught INT; storing stop
|
||||
Notice: Processing stop
|
||||
|
||||
Now, the certificate is being generated. Once we see **Notice: Starting Puppet master version 3.8.1**, the certificate setup is complete. Then we'll press CTRL-C to return to the shell.
|
||||
|
||||
If we wanna look at the cert information of the certificate that was just created, we can get the list by running in the following command.
|
||||
|
||||
# puppet cert list -all
|
||||
|
||||
+ "puppetmaster" (SHA256) 33:28:97:86:A1:C3:2F:73:10:D1:FB:42:DA:D5:42:69:71:84:F0:E2:8A:01:B9:58:38:90:E4:7D:B7:25:23:EC (alt names: "DNS:puppetmaster", "DNS:puppetmaster.example.com")
|
||||
|
||||
### 6. Creating a Puppet Manifest ###
|
||||
|
||||
The default location of the main manifest is /etc/puppet/manifests/site.pp. The main manifest file contains the definition of configuration that is used to execute in the puppet node agent. Now, we'll create the manifest file by running the following command.
|
||||
|
||||
# nano /etc/puppet/manifests/site.pp
|
||||
|
||||
Then, we'll add the following lines of configuration in the file that we just opened.
|
||||
|
||||
# execute 'apt-get update'
|
||||
exec { 'apt-update': # exec resource named 'apt-update'
|
||||
command => '/usr/bin/apt-get update' # command this resource will run
|
||||
}
|
||||
|
||||
# install apache2 package
|
||||
package { 'apache2':
|
||||
require => Exec['apt-update'], # require 'apt-update' before installing
|
||||
ensure => installed,
|
||||
}
|
||||
|
||||
# ensure apache2 service is running
|
||||
service { 'apache2':
|
||||
ensure => running,
|
||||
}
|
||||
|
||||
The above lines of configuration are responsible for the deployment of the installation of apache web server across the node agent.
|
||||
|
||||
### 7. Starting Master Service ###
|
||||
|
||||
We are now ready to start the puppet master. We can start it by running the apache2 service.
|
||||
|
||||
# systemctl start apache2
|
||||
|
||||
Here, our puppet master is running, but it isn't managing any agent nodes yet. Now, we'll gonna add the puppet node agents to the master.
|
||||
|
||||
**Note**: If you get an error **Job for apache2.service failed. See "systemctl status apache2.service" and "journalctl -xe" for details.** then it must be that there is some problem with the apache server. So, we can see the log what exactly has happened by running **apachectl start** under root or sudo mode. Here, while performing this tutorial, we got a misconfiguration of the certificates under **/etc/apache2/sites-enabled/puppetmaster.conf** file. We replaced **SSLCertificateFile /var/lib/puppet/ssl/certs/server.pem with SSLCertificateFile /var/lib/puppet/ssl/certs/puppetmaster.pem** and commented **SSLCertificateKeyFile** line. Then we'll need to rerun the above command to run apache server.
|
||||
|
||||
### 8. Puppet Agent Package Installation ###
|
||||
|
||||
Now, as we have our puppet master ready and it needs an agent to manage, we'll need to install puppet agent into the nodes. We'll need to install puppet agent in every nodes in our infrastructure we want puppet master to manage. We'll need to make sure that we have added our node agents in the DNS. Now, we'll gonna install the latest puppet agent in our agent node ie. puppetnode.example.com .
|
||||
|
||||
We'll run the following command to download the Puppet Labs package in our puppet agent nodes.
|
||||
|
||||
# cd /tmp/
|
||||
# wget https://apt.puppetlabs.com/puppetlabs-release-trusty.deb\
|
||||
|
||||
--2015-06-17 00:54:42-- https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
|
||||
Resolving apt.puppetlabs.com (apt.puppetlabs.com)... 192.155.89.90, 2600:3c03::f03c:91ff:fedb:6b1d
|
||||
Connecting to apt.puppetlabs.com (apt.puppetlabs.com)|192.155.89.90|:443... connected.
|
||||
HTTP request sent, awaiting response... 200 OK
|
||||
Length: 7384 (7.2K) [application/x-debian-package]
|
||||
Saving to: ‘puppetlabs-release-trusty.deb’
|
||||
|
||||
puppetlabs-release-tr 100%[===========================>] 7.21K --.-KB/s in 0.04s
|
||||
|
||||
2015-06-17 00:54:42 (162 KB/s) - ‘puppetlabs-release-trusty.deb’ saved [7384/7384]
|
||||
|
||||
Then, as we're running ubuntu 15.04, we'll use debian package manager to install it.
|
||||
|
||||
# dpkg -i puppetlabs-release-trusty.deb
|
||||
|
||||
Now, we'll gonna update the repository index using apt-get.
|
||||
|
||||
# apt-get update
|
||||
|
||||
Finally, we'll gonna install the puppet agent directly from the remote repository.
|
||||
|
||||
# apt-get install puppet
|
||||
|
||||
Puppet agent is always disabled by default, so we'll need to enable it. To do so we'll need to edit /etc/default/puppet file using a text editor.
|
||||
|
||||
# nano /etc/default/puppet
|
||||
|
||||
Then, we'll need to change value of **START** to "yes" as shown below.
|
||||
|
||||
START=yes
|
||||
|
||||
Then, we'll need to save and exit the file.
|
||||
|
||||
### 9. Agent Version Lock with Apt ###
|
||||
|
||||
As We have puppet version as 3.8.1, we need to lock the puppet version update as this will mess up the configurations while updating the puppet. So, we'll use apt's locking feature for that. To do so, we'll need to create a file /etc/apt/preferences.d/00-puppet.pref using our favorite text editor.
|
||||
|
||||
# nano /etc/apt/preferences.d/00-puppet.pref
|
||||
|
||||
Then, we'll gonna add the entries in the newly created file as:
|
||||
|
||||
# /etc/apt/preferences.d/00-puppet.pref
|
||||
Package: puppet puppet-common
|
||||
Pin: version 3.8*
|
||||
Pin-Priority: 501
|
||||
|
||||
Now, it will not update the Puppet while running updates in the system.
|
||||
|
||||
### 10. Configuring Puppet Node Agent ###
|
||||
|
||||
Next, We must make a few configuration changes before running the agent. To do so, we'll need to edit the agent's puppet.conf
|
||||
|
||||
# nano /etc/puppet/puppet.conf
|
||||
|
||||
It will look exactly like the Puppet master's initial configuration file.
|
||||
|
||||
This time also we'll comment the **templatedir** line. Then we'll gonna delete the [master] section, and all of the lines below it.
|
||||
|
||||
Assuming that the puppet master is reachable at "puppet-master", the agent should be able to connect to the master. If not we'll need to use its fully qualified domain name ie. puppetmaster.example.com .
|
||||
|
||||
[agent]
|
||||
server = puppetmaster.example.com
|
||||
certname = puppetnode.example.com
|
||||
|
||||
After adding this, it will look alike this.
|
||||
|
||||
[main]
|
||||
logdir=/var/log/puppet
|
||||
vardir=/var/lib/puppet
|
||||
ssldir=/var/lib/puppet/ssl
|
||||
rundir=/var/run/puppet
|
||||
factpath=$vardir/lib/facter
|
||||
#templatedir=$confdir/templates
|
||||
|
||||
[agent]
|
||||
server = puppetmaster.example.com
|
||||
certname = puppetnode.example.com
|
||||
|
||||
After done with that, we'll gonna save and exit it.
|
||||
|
||||
Next, we'll wanna start our latest puppet agent in our Ubuntu 15.04 nodes. To start our puppet agent, we'll need to run the following command.
|
||||
|
||||
# systemctl start puppet
|
||||
|
||||
If everything went as expected and configured properly, we should not see any output displayed by running the above command. When we run an agent for the first time, it generates an SSL certificate and sends a request to the puppet master then if the master signs the agent's certificate, it will be able to communicate with the agent node.
|
||||
|
||||
**Note**: If you are adding your first node, it is recommended that you attempt to sign the certificate on the puppet master before adding your other agents. Once you have verified that everything works properly, then you can go back and add the remaining agent nodes further.
|
||||
|
||||
### 11. Signing certificate Requests on Master ###
|
||||
|
||||
While puppet agent runs for the first time, it generates an SSL certificate and sends a request for signing to the master server. Before the master will be able to communicate and control the agent node, it must sign that specific agent node's certificate.
|
||||
|
||||
To get the list of the certificate requests, we'll run the following command in the puppet master server.
|
||||
|
||||
# puppet cert list
|
||||
|
||||
"puppetnode.example.com" (SHA256) 31:A1:7E:23:6B:CD:7B:7D:83:98:33:8B:21:01:A6:C4:01:D5:53:3D:A0:0E:77:9A:77:AE:8F:05:4A:9A:50:B2
|
||||
|
||||
As we just setup our first agent node, we will see one request. It will look something like the following, with the agent node's Domain name as the hostname.
|
||||
|
||||
Note that there is no + in front of it which indicates that it has not been signed yet.
|
||||
|
||||
Now, we'll go for signing a certification request. In order to sign a certification request, we should simply run **puppet cert sign** with the **hostname** as shown below.
|
||||
|
||||
# puppet cert sign puppetnode.example.com
|
||||
|
||||
Notice: Signed certificate request for puppetnode.example.com
|
||||
Notice: Removing file Puppet::SSL::CertificateRequest puppetnode.example.com at '/var/lib/puppet/ssl/ca/requests/puppetnode.example.com.pem'
|
||||
|
||||
The Puppet master can now communicate and control the node that the signed certificate belongs to.
|
||||
|
||||
If we want to sign all of the current requests, we can use the -all option as shown below.
|
||||
|
||||
# puppet cert sign --all
|
||||
|
||||
### Removing a Puppet Certificate ###
|
||||
|
||||
If we wanna remove a host from it or wanna rebuild a host then add it back to it. In this case, we will want to revoke the host's certificate from the puppet master. To do this, we will want to use the clean action as follows.
|
||||
|
||||
# puppet cert clean hostname
|
||||
|
||||
Notice: Revoked certificate with serial 5
|
||||
Notice: Removing file Puppet::SSL::Certificate puppetnode.example.com at '/var/lib/puppet/ssl/ca/signed/puppetnode.example.com.pem'
|
||||
Notice: Removing file Puppet::SSL::Certificate puppetnode.example.com at '/var/lib/puppet/ssl/certs/puppetnode.example.com.pem'
|
||||
|
||||
If we want to view all of the requests signed and unsigned, run the following command:
|
||||
|
||||
# puppet cert list --all
|
||||
|
||||
+ "puppetmaster" (SHA256) 33:28:97:86:A1:C3:2F:73:10:D1:FB:42:DA:D5:42:69:71:84:F0:E2:8A:01:B9:58:38:90:E4:7D:B7:25:23:EC (alt names: "DNS:puppetmaster", "DNS:puppetmaster.example.com")
|
||||
|
||||
### 12. Deploying a Puppet Manifest ###
|
||||
|
||||
After we configure and complete the puppet manifest, we'll wanna deploy the manifest to the agent nodes server. To apply and load the main manifest we can simply run the following command in the agent node.
|
||||
|
||||
# puppet agent --test
|
||||
|
||||
Info: Retrieving pluginfacts
|
||||
Info: Retrieving plugin
|
||||
Info: Caching catalog for puppetnode.example.com
|
||||
Info: Applying configuration version '1434563858'
|
||||
Notice: /Stage[main]/Main/Exec[apt-update]/returns: executed successfully
|
||||
Notice: Finished catalog run in 10.53 seconds
|
||||
|
||||
This will show us all the processes how the main manifest will affect a single server immediately.
|
||||
|
||||
If we wanna run a puppet manifest that is not related to the main manifest, we can simply use puppet apply followed by the manifest file path. It only applies the manifest to the node that we run the apply from.
|
||||
|
||||
# puppet apply /etc/puppet/manifest/test.pp
|
||||
|
||||
### 13. Configuring Manifest for a Specific Node ###
|
||||
|
||||
If we wanna deploy a manifest only to a specific node then we'll need to configure the manifest as follows.
|
||||
|
||||
We'll need to edit the manifest on the master server using a text editor.
|
||||
|
||||
# nano /etc/puppet/manifest/site.pp
|
||||
|
||||
Now, we'll gonna add the following lines there.
|
||||
|
||||
node 'puppetnode', 'puppetnode1' {
|
||||
# execute 'apt-get update'
|
||||
exec { 'apt-update': # exec resource named 'apt-update'
|
||||
command => '/usr/bin/apt-get update' # command this resource will run
|
||||
}
|
||||
|
||||
# install apache2 package
|
||||
package { 'apache2':
|
||||
require => Exec['apt-update'], # require 'apt-update' before installing
|
||||
ensure => installed,
|
||||
}
|
||||
|
||||
# ensure apache2 service is running
|
||||
service { 'apache2':
|
||||
ensure => running,
|
||||
}
|
||||
}
|
||||
|
||||
Here, the above configuration will install and deploy the apache web server only to the two specified nodes having shortname puppetnode and puppetnode1. We can add more nodes that we need to get deployed with the manifest specifically.
|
||||
|
||||
### 14. Configuring Manifest with a Module ###
|
||||
|
||||
Modules are useful for grouping tasks together, they are many available in the Puppet community which anyone can contribute further.
|
||||
|
||||
On the puppet master, we'll gonna install the **puppetlabs-apache** module using the puppet module command.
|
||||
|
||||
# puppet module install puppetlabs-apache
|
||||
|
||||
**Warning**: Please do not use this module on an existing apache setup else it will purge your apache configurations that are not managed by puppet.
|
||||
|
||||
Now we'll gonna edit the main manifest ie **site.pp** using a text editor.
|
||||
|
||||
# nano /etc/puppet/manifest/site.pp
|
||||
|
||||
Now add the following lines to install apache under puppetnode.
|
||||
|
||||
node 'puppet-node' {
|
||||
class { 'apache': } # use apache module
|
||||
apache::vhost { 'example.com': # define vhost resource
|
||||
port => '80',
|
||||
docroot => '/var/www/html'
|
||||
}
|
||||
}
|
||||
|
||||
Then we'll wanna save and exit it. Then, we'll wanna rerun the manifest to deploy the configuration to the agents for our infrastructure.
|
||||
|
||||
### Conclusion ###
|
||||
|
||||
Finally we have successfully installed puppet to manage our Server Infrastructure running Ubuntu 15.04 "Vivid Vervet" linux operating system. We learned how puppet works, configure a manifest configuration, communicate with nodes and deploy the manifest on the agent nodes with secure SSL certification. Controlling, managing and configuring repeated task in several N number of nodes is very easy with puppet open source software configuration management tool. If you have any questions, suggestions, feedback please write them in the comment box below so that we can improve or update our contents. Thank you ! Enjoy :-)
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://linoxide.com/linux-how-to/install-puppet-ubuntu-15-04/
|
||||
|
||||
作者：[Arun Pyasi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/arunp/
|
||||
[1]:https://docs.puppetlabs.com/puppet/latest/reference/config_file_main.html
|
||||
@ -1,3 +1,4 @@
|
||||
translated by iov-wang
|
||||
How to Install OsTicket Ticketing System in Fedora 22 / Centos 7
|
||||
================================================================================
|
||||
In this article, we'll learn how to setup help desk ticketing system with osTicket in our machine or server running Fedora 22 or CentOS 7 as operating system. osTicket is a free and open source popular customer support ticketing system developed and maintained by [Enhancesoft][1] and its contributors. osTicket is the best solution for help and support ticketing system and management for better communication and support assistance with clients and customers. It has the ability to easily integrate with inquiries created via email, phone and web based forms into a beautiful multi-user web interface. osTicket makes us easy to manage, organize and log all our support requests and responses in one single place. It is a simple, lightweight, reliable, open source, web-based and easy to setup and use help desk ticketing system.
|
||||
@ -176,4 +177,4 @@ via: http://linoxide.com/linux-how-to/install-osticket-fedora-22-centos-7/
|
||||
[a]:http://linoxide.com/author/arunp/
|
||||
[1]:http://www.enhancesoft.com/
|
||||
[2]:http://osticket.com/download
|
||||
[3]:https://github.com/osTicket/osTicket-1.8/releases
|
||||
[3]:https://github.com/osTicket/osTicket-1.8/releases
|
||||
|
||||
@ -1,3 +1,4 @@
|
||||
translated by ivo-wang
|
||||
How to Configure OpenNMS on CentOS 7.x
|
||||
================================================================================
|
||||
Systems management and monitoring services are very important that provides information to view important systems management information that allow us to to make decisions based on this information. To make sure the network is running at its best and to minimize the network downtime we need to improve application performance. So, in this article we will make you understand the step by step procedure to setup OpenNMS in your IT infrastructure. OpenNMS is a free open source enterprise level network monitoring and management platform that provides information to allow us to make decisions in regards to future network and capacity planning.
|
||||
@ -216,4 +217,4 @@ via: http://linoxide.com/monitoring-2/install-configure-opennms-centos-7-x/
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/kashifs/
|
||||
[a]:http://linoxide.com/author/kashifs/
|
||||
|
||||
@ -1,3 +1,4 @@
|
||||
translated by ivo-wang
|
||||
How to install Suricata intrusion detection system on Linux
|
||||
================================================================================
|
||||
With incessant security threats, intrusion detection system (IDS) has become one of the most critical requirements in today's data center environments. However, as more and more servers upgrade their NICs to 10GB/40GB Ethernet, it is increasingly difficult to implement compute-intensive intrusion detection on commodity hardware at line rates. One approach to scaling IDS performance is **multi-threaded IDS**, where CPU-intensive deep packet inspection workload is parallelized into multiple concurrent tasks. Such parallelized inspection can exploit multi-core hardware to scale up IDS throughput easily. Two well-known open-source efforts in this area are [Suricata][1] and [Bro][2].
|
||||
@ -194,4 +195,4 @@ via: http://xmodulo.com/install-suricata-intrusion-detection-system-linux.html
|
||||
[6]:https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Runmodes
|
||||
[7]:http://ask.xmodulo.com/view-threads-process-linux.html
|
||||
[8]:http://xmodulo.com/how-to-compile-and-install-snort-from-source-code-on-ubuntu.html
|
||||
[9]:https://redmine.openinfosecfoundation.org/projects/suricata/wiki
|
||||
[9]:https://redmine.openinfosecfoundation.org/projects/suricata/wiki
|
||||
|
||||
@ -1,279 +0,0 @@
|
||||
translating by ezio
|
||||
|
||||
10 Tips for 10x Application Performance
|
||||
================================================================================
|
||||
Improving web application performance is more critical than ever. The share of economic activity that’s online is growing; more than 5% of the developed world’s economy is now on the Internet (see Resources below for statistics). And our always-on, hyper-connected modern world means that user expectations are higher than ever. If your site does not respond instantly, or if your app does not work without delay, users quickly move on to your competitors.
|
||||
|
||||
For example, a study done by Amazon almost 10 years ago proved that, even then, a 100-millisecond decrease in page-loading time translated to a 1% increase in its revenue. Another recent study highlighted the fact that that more than half of site owners surveyed said they lost revenue or customers due to poor application performance.
|
||||
|
||||
How fast does a website need to be? For each second a page takes to load, about 4% of users abandon it. Top e-commerce sites offer a time to first interaction ranging from one to three seconds, which offers the highest conversion rate. It’s clear that the stakes for web application performance are high and likely to grow.
|
||||
|
||||
Wanting to improve performance is easy, but actually seeing results is difficult. To help you on your journey, this blog post offers you ten tips to help you increase your website performance by as much as 10x. It’s the first in a series detailing how you can increase your application performance with the help of some well-tested optimization techniques, and with a little support from NGINX. This series also outlines potential improvements in security that you can gain along the way.
|
||||
|
||||
### Tip #1: Accelerate and Secure Applications with a Reverse Proxy Server ###
|
||||
|
||||
If your web application runs on a single machine, the solution to performance problems might seem obvious: just get a faster machine, with more processor, more RAM, a fast disk array, and so on. Then the new machine can run your WordPress server, Node.js application, Java application, etc., faster than before. (If your application accesses a database server, the solution might still seem simple: get two faster machines, and a faster connection between them.)
|
||||
|
||||
Trouble is, machine speed might not be the problem. Web applications often run slowly because the computer is switching among different kinds of tasks: interacting with users on thousands of connections, accessing files from disk, and running application code, among others. The application server may be thrashing – running out of memory, swapping chunks of memory out to disk, and making many requests wait on a single task such as disk I/O.
|
||||
|
||||
Instead of upgrading your hardware, you can take an entirely different approach: adding a reverse proxy server to offload some of these tasks. A [reverse proxy server][1] sits in front of the machine running the application and handles Internet traffic. Only the reverse proxy server is connected directly to the Internet; communication with the application servers is over a fast internal network.
|
||||
|
||||
Using a reverse proxy server frees the application server from having to wait for users to interact with the web app and lets it concentrate on building pages for the reverse proxy server to send across the Internet. The application server, which no longer has to wait for client responses, can run at speeds close to those achieved in optimized benchmarks.
|
||||
|
||||
Adding a reverse proxy server also adds flexibility to your web server setup. For instance, if a server of a given type is overloaded, another server of the same type can easily be added; if a server is down, it can easily be replaced.
|
||||
|
||||
Because of the flexibility it provides, a reverse proxy server is also a prerequisite for many other performance-boosting capabilities, such as:
|
||||
|
||||
- **Load balancing** (see [Tip #2][2]) – A load balancer runs on a reverse proxy server to share traffic evenly across a number of application servers. With a load balancer in place, you can add application servers without changing your application at all.
|
||||
- **Caching static files** (see [Tip #3][3]) – Files that are requested directly, such as image files or code files, can be stored on the reverse proxy server and sent directly to the client, which serves assets more quickly and offloads the application server, allowing the application to run faster.
|
||||
- **Securing your site** – The reverse proxy server can be configured for high security and monitored for fast recognition and response to attacks, keeping the application servers protected.
|
||||
|
||||
NGINX software is specifically designed for use as a reverse proxy server, with the additional capabilities described above. NGINX uses an event-driven processing approach which is more efficient than traditional servers. NGINX Plus adds more advanced reverse proxy features, such as application [health checks][4], specialized request routing, advanced caching, and support.
|
||||
|
||||
|
||||
|
||||
### Tip #2: Add a Load Balancer ###
|
||||
|
||||
Adding a [load balancer][5] is a relatively easy change which can create a dramatic improvement in the performance and security of your site. Instead of making a core web server bigger and more powerful, you use a load balancer to distribute traffic across a number of servers. Even if an application is poorly written, or has problems with scaling, a load balancer can improve the user experience without any other changes.
|
||||
|
||||
A load balancer is, first, a reverse proxy server (see [Tip #1][6]) – it receives Internet traffic and forwards requests to another server. The trick is that the load balancer supports two or more application servers, using [a choice of algorithms][7] to split requests between servers. The simplest load balancing approach is round robin, with each new request sent to the next server on the list. Other methods include sending requests to the server with the fewest active connections. NGINX Plus has [capabilities][8] for continuing a given user session on the same server, which is called session persistence.
|
||||
|
||||
Load balancers can lead to strong improvements in performance because they prevent one server from being overloaded while other servers wait for traffic. They also make it easy to expand your web server capacity, as you can add relatively low-cost servers and be sure they’ll be put to full use.
|
||||
|
||||
Protocols that can be load balanced include HTTP, HTTPS, SPDY, HTTP/2, WebSocket, [FastCGI][9], SCGI, uwsgi, memcached, and several other application types, including TCP-based applications and other Layer 4 protocols. Analyze your web applications to determine which you use and where performance is lagging.
|
||||
|
||||
The same server or servers used for load balancing can also handle several other tasks, such as SSL termination, support for HTTP/1/x and HTTP/2 use by clients, and caching for static files.
|
||||
|
||||
NGINX is often used for load balancing; to learn more, please see our [overview blog post][10], [configuration blog post][11], [ebook][12] and associated [webinar][13], and [documentation][14]. Our commercial version, [NGINX Plus][15], supports more specialized load balancing features such as load routing based on server response time and the ability to load balance on Microsoft’s NTLM protocol.
|
||||
|
||||
### Tip #3: Cache Static and Dynamic Content ###
|
||||
|
||||
Caching improves web application performance by delivering content to clients faster. Caching can involve several strategies: preprocessing content for fast delivery when needed, storing content on faster devices, storing content closer to the client, or a combination.
|
||||
|
||||
There are two different types of caching to consider:
|
||||
|
||||
- **Caching of static content**. Infrequently changing files, such as image files (JPEG, PNG) and code files (CSS, JavaScript), can be stored on an edge server for fast retrieval from memory or disk.
|
||||
- **Caching of dynamic content**. Many Web applications generate fresh HTML for each page request. By briefly caching one copy of the generated HTML for a brief period of time, you can dramatically reduce the total number of pages that have to be generated while still delivering content that’s fresh enough to meet your requirements.
|
||||
|
||||
If a page gets ten views per second, for instance, and you cache it for one second, 90% of requests for the page will come from the cache. If you separately cache static content, even the freshly generated versions of the page might be made up largely of cached content.
|
||||
|
||||
There are three main techniques for caching content generated by web applications:
|
||||
|
||||
- **Moving content closer to users**. Keeping a copy of content closer to the user reduces its transmission time.
|
||||
- **Moving content to faster machines**. Content can be kept on a faster machine for faster retrieval.
|
||||
- **Moving content off of overused machines**. Machines sometimes operate much slower than their benchmark performance on a particular task because they are busy with other tasks. Caching on a different machine improves performance for the cached resources and also for non-cached resources, because the host machine is less overloaded.
|
||||
|
||||
Caching for web applications can be implemented from the inside – the web application server – out. First, caching is used for dynamic content, to reduce the load on application servers. Then, caching is used for static content (including temporary copies of what would otherwise be dynamic content), further off-loading application servers. And caching is then moved off of application servers and onto machines that are faster and/or closer to the user, unburdening the application servers, and reducing retrieval and transmission times.
|
||||
|
||||
Improved caching can speed up applications tremendously. For many web pages, static data, such as large image files, makes up more than half the content. It might take several seconds to retrieve and transmit such data without caching, but only fractions of a second if the data is cached locally.
|
||||
|
||||
As an example of how caching is used in practice, NGINX and NGINX Plus use two directives to [set up caching][16]: proxy_cache_path and proxy_cache. You specify the cache location and size, the maximum time files are kept in the cache, and other parameters. Using a third (and quite popular) directive, proxy_cache_use_stale, you can even direct the cache to supply stale content when the server that supplies fresh content is busy or down, giving the client something rather than nothing. From the user’s perspective, this may strongly improves your site or application’s uptime.
|
||||
|
||||
NGINX Plus has [advanced caching features][17], including support for [cache purging][18] and visualization of cache status on a [dashboard][19] for live activity monitoring.
|
||||
|
||||
For more information on caching with NGINX, see the [reference documentation][20] and [NGINX Content Caching][21] in the NGINX Plus Admin Guide.
|
||||
|
||||
**Note**: Caching crosses organizational lines between people who develop applications, people who make capital investment decisions, and people who run networks in real time. Sophisticated caching strategies, like those alluded to here, are a good example of the value of a [DevOps perspective][22], in which application developer, architectural, and operations perspectives are merged to help meet goals for site functionality, response time, security, and business results, )such as completed transactions or sales.
|
||||
|
||||
### Tip #4: Compress Data ###
|
||||
|
||||
Compression is a huge potential performance accelerator. There are carefully engineered and highly effective compression standards for photos (JPEG and PNG), videos (MPEG-4), and music (MP3), among others. Each of these standards reduces file size by an order of magnitude or more.
|
||||
|
||||
Text data – including HTML (which includes plain text and HTML tags), CSS, and code such as JavaScript – is often transmitted uncompressed. Compressing this data can have a disproportionate impact on perceived web application performance, especially for clients with slow or constrained mobile connections.
|
||||
|
||||
That’s because text data is often sufficient for a user to interact with a page, where multimedia data may be more supportive or decorative. Smart content compression can reduce the bandwidth requirements of HTML, Javascript, CSS and other text-based content, typically by 30% or more, with a corresponding reduction in load time.
|
||||
|
||||
If you use SSL, compression reduces the amount of data that has to be SSL-encoded, which offsets some of the CPU time it takes to compress the data.
|
||||
|
||||
Methods for compressing text data vary. For example, see the [section on HTTP/2][23] for a novel text compression scheme, adapted specifically for header data. As another example of text compression you can [turn on][24] GZIP compression in NGINX. After you [pre-compress text data][25] on your services, you can serve the compressed .gz version directly using the gzip_static directive.
|
||||
|
||||
### Tip #5: Optimize SSL/TLS ###
|
||||
|
||||
The Secure Sockets Layer ([SSL][26]) protocol and its successor, the Transport Layer Security (TLS) protocol, are being used on more and more websites. SSL/TLS encrypts the data transported from origin servers to users to help improve site security. Part of what may be influencing this trend is that Google now uses the presence of SSL/TLS as a positive influence on search engine rankings.
|
||||
|
||||
Despite rising popularity, the performance hit involved in SSL/TLS is a sticking point for many sites. SSL/TLS slows website performance for two reasons:
|
||||
|
||||
1. The initial handshake required to establish encryption keys whenever a new connection is opened. The way that browsers using HTTP/1.x establish multiple connections per server multiplies that hit.
|
||||
1. Ongoing overhead from encrypting data on the server and decrypting it on the client.
|
||||
|
||||
To encourage the use of SSL/TLS, the authors of HTTP/2 and SPDY (described in the [next section][27]) designed these protocols so that browsers need just one connection per browser session. This greatly reduces one of the two major sources of SSL overhead. However, even more can be done today to improve the performance of applications delivered over SSL/TLS.
|
||||
|
||||
The mechanism for optimizing SSL/TLS varies by web server. As an example, NGINX uses [OpenSSL][28], running on standard commodity hardware, to provide performance similar to dedicated hardware solutions. NGINX [SSL performance][29] is well-documented and minimizes the time and CPU penalty from performing SSL/TLS encryption and decryption.
|
||||
|
||||
In addition, see [this blog post][30] for details on ways to increase SSL/TLS performance. To summarize briefly, the techniques are:
|
||||
|
||||
- **Session caching**. Uses the [ssl_session_cache][31] directive to cache the parameters used when securing each new connection with SSL/TLS.
|
||||
- **Session tickets or IDs**. These store information about specific SSL/TLS sessions in a ticket or ID so a connection can be reused smoothly, without new handshaking.
|
||||
- **OCSP stapling**. Cuts handshaking time by caching SSL/TLS certificate information.
|
||||
|
||||
NGINX and NGINX Plus can be used for SSL/TLS termination – handling encryption and decyption for client traffic, while communicating with other servers in clear text. Use [these steps][32] to set up NGINX or NGINX Plus to handle SSL/TLS termination. Also, here are [specific steps][33] for NGINX Plus when used with servers that accept TCP connections.
|
||||
|
||||
### Tip #6: Implement HTTP/2 or SPDY ###
|
||||
|
||||
For sites that already use SSL/TLS, HTTP/2 and SPDY are very likely to improve performance, because the single connection requires just one handshake. For sites that don’t yet use SSL/TLS, HTTP/2 and SPDY makes a move to SSL/TLS (which normally slows performance) a wash from a responsiveness point of view.
|
||||
|
||||
Google introduced SPDY in 2012 as a way to achieve faster performance on top of HTTP/1.x. HTTP/2 is the recently approved IETF standard based on SPDY. SPDY is broadly supported, but is soon to be deprecated, replaced by HTTP/2.
|
||||
|
||||
The key feature of SPDY and HTTP/2 is the use of a single connection rather than multiple connections. The single connection is multiplexed, so it can carry pieces of multiple requests and responses at the same time.
|
||||
|
||||
By getting the most out of one connection, these protocols avoid the overhead of setting up and managing multiple connections, as required by the way browsers implement HTTP/1.x. The use of a single connection is especially helpful with SSL, because it minimizes the time-consuming handshaking that SSL/TLS needs to set up a secure connection.
|
||||
|
||||
The SPDY protocol required the use of SSL/TLS; HTTP/2 does not officially require it, but all browsers so far that support HTTP/2 use it only if SSL/TLS is enabled. That is, a browser that supports HTTP/2 uses it only if the website is using SSL and its server accepts HTTP/2 traffic. Otherwise, the browser communicates over HTTP/1.x.
|
||||
|
||||
When you implement SPDY or HTTP/2, you no longer need typical HTTP performance optimizations such as domain sharding, resource merging, and image spriting. These changes make your code and deployments simpler and easier to manage. To learn more about the changes that HTTP/2 is bringing about, read our [white paper][34].
|
||||
|
||||
|
||||
|
||||
As an example of support for these protocols, NGINX has supported SPDY from early on, and [most sites][35] that use SPDY today run on NGINX. NGINX is also [pioneering support][36] for HTTP/2, with [support][37] for HTTP/2 in NGINX open source and NGINX Plus as of September 2015.
|
||||
|
||||
Over time, we at NGINX expect most sites to fully enable SSL and to move to HTTP/2. This will lead to increased security and, as new optimizations are found and implemented, simpler code that performs better.
|
||||
|
||||
### Tip #7: Update Software Versions ###
|
||||
|
||||
One simple way to boost application performance is to select components for your software stack based on their reputation for stability and performance. In addition, because developers of high-quality components are likely to pursue performance enhancements and fix bugs over time, it pays to use the latest stable version of software. New releases receive more attention from developers and the user community. Newer builds also take advantage of new compiler optimizations, including tuning for new hardware.
|
||||
|
||||
Stable new releases are typically more compatible and higher-performing than older releases. It’s also easier to keep on top of tuning optimizations, bug fixes, and security alerts when you stay on top of software updates.
|
||||
|
||||
Staying with older software can also prevent you from taking advantage of new capabilities. For example, HTTP/2, described above, currently requires OpenSSL 1.0.1. Starting in mid-2016, HTTP/2 will require OpenSSL 1.0.2, which was released in January 2015.
|
||||
|
||||
NGINX users can start by moving to the [[latest version of the NGINX open source software][38] or [NGINX Plus][39]; they include new capabilities such as socket sharding and thread pools (see below), and both are constantly being tuned for performance. Then look at the software deeper in your stack and move to the most recent version wherever you can.
|
||||
|
||||
### Tip #8: Tune Linux for Performance ###
|
||||
|
||||
Linux is the underlying operating system for most web server implementations today, and as the foundation of your infrastructure, Linux represents a significant opportunity to improve performance. By default, many Linux systems are conservatively tuned to use few resources and to match a typical desktop workload. This means that web application use cases require at least some degree of tuning for maximum performance.
|
||||
|
||||
Linux optimizations are web server-specific. Using NGINX as an example, here are a few highlights of changes you can consider to speed up Linux:
|
||||
|
||||
- **Backlog queue**. If you have connections that appear to be stalling, consider increasing net.core.somaxconn, the maximum number of connections that can be queued awaiting attention from NGINX. You will see error messages if the existing connection limit is too small, and you can gradually increase this parameter until the error messages stop.
|
||||
- **File descriptors**. NGINX uses up to two file descriptors for each connection. If your system is serving a lot of connections, you might need to increase sys.fs.file_max, the system-wide limit for file descriptors, and nofile, the user file descriptor limit, to support the increased load.
|
||||
- **Ephemeral ports**. When used as a proxy, NGINX creates temporary (“ephemeral”) ports for each upstream server. You can increase the range of port values, set by net.ipv4.ip_local_port_range, to increase the number of ports available. You can also reduce the timeout before an inactive port gets reused with the net.ipv4.tcp_fin_timeout setting, allowing for faster turnover.
|
||||
|
||||
For NGINX, check out the [NGINX performance tuning guides][40] to learn how to optimize your Linux system so that it can cope with large volumes of network traffic without breaking a sweat!
|
||||
|
||||
### Tip #9: Tune Your Web Server for Performance ###
|
||||
|
||||
Whatever web server you use, you need to tune it for web application performance. The following recommendations apply generally to any web server, but specific settings are given for NGINX. Key optimizations include:
|
||||
|
||||
- **Access logging**. Instead of writing a log entry for every request to disk immediately, you can buffer entries in memory and write them to disk as a group. For NGINX, add the *buffer=size* parameter to the *access_log* directive to write log entries to disk when the memory buffer fills up. If you add the **flush=time** parameter, the buffer contents are also be written to disk after the specified amount of time.
|
||||
- **Buffering**. Buffering holds part of a response in memory until the buffer fills, which can make communications with the client more efficient. Responses that don’t fit in memory are written to disk, which can slow performance. When NGINX buffering is [on][42], you use the *proxy_buffer_size* and *proxy_buffers* directives to manage it.
|
||||
- **Client keepalives**. Keepalive connections reduce overhead, especially when SSL/TLS is in use. For NGINX, you can increase the maximum number of *keepalive_requests* a client can make over a given connection from the default of 100, and you can increase the *keepalive_timeout* to allow the keepalive connection to stay open longer, resulting in faster subsequent requests.
|
||||
- **Upstream keepalives**. Upstream connections – connections to application servers, database servers, and so on – benefit from keepalive connections as well. For upstream connections, you can increase *keepalive*, the number of idle keepalive connections that remain open for each worker process. This allows for increased connection reuse, cutting down on the need to open brand new connections. For more information about keepalives, refer to this [blog post][41].
|
||||
- **Limits**. Limiting the resources that clients use can improve performance and security. For NGINX,the *limit_conn* and *limit_conn_zone* directives restrict the number of connections from a given source, while *limit_rate* constrains bandwidth. These settings can stop a legitimate user from “hogging” resources and also help prevent against attacks. The *limit_req* and *limit_req_zone* directives limit client requests. For connections to upstream servers, use the max_conns parameter to the server directive in an upstream configuration block. This limits connections to an upstream server, preventing overloading. The associated queue directive creates a queue that holds a specified number of requests for a specified length of time after the *max_conns* limit is reached.
|
||||
- **Worker processes**. Worker processes are responsible for the processing of requests. NGINX employs an event-based model and OS-dependent mechanisms to efficiently distribute requests among worker processes. The recommendation is to set the value of *worker_processes* to one per CPU. The maximum number of worker_connections (512 by default) can safely be raised on most systems if needed; experiment to find the value that works best for your system.
|
||||
- **Socket sharding**. Typically, a single socket listener distributes new connections to all worker processes. Socket sharding creates a socket listener for each worker process, with the kernel assigning connections to socket listeners as they become available. This can reduce lock contention and improve performance on multicore systems. To enable [socket sharding][43], include the reuseport parameter on the listen directive.
|
||||
- **Thread pools**. Any computer process can be held up by a single, slow operation. For web server software, disk access can hold up many faster operations, such as calculating or copying information in memory. When a thread pool is used, the slow operation is assigned to a separate set of tasks, while the main processing loop keeps running faster operations. When the disk operation completes, the results go back into the main processing loop. In NGINX, two operations – the read() system call and sendfile() – are offloaded to [thread pools][44].
|
||||
|
||||
|
||||
|
||||
**Tip**. When changing settings for any operating system or supporting service, change a single setting at a time, then test performance. If the change causes problems, or if it doesn’t make your site run faster, change it back.
|
||||
|
||||
See this [blog post][45] for more details on tuning NGINX.
|
||||
|
||||
### Tip #10: Monitor Live Activity to Resolve Issues and Bottlenecks ###
|
||||
|
||||
The key to a high-performance approach to application development and delivery is watching your application’s real-world performance closely and in real time. You must be able to monitor activity within specific devices and across your web infrastructure.
|
||||
|
||||
Monitoring site activity is mostly passive – it tells you what’s going on, and leaves it to you to spot problems and fix them.
|
||||
|
||||
Monitoring can catch several different kinds of issues. They include:
|
||||
|
||||
- A server is down.
|
||||
- A server is limping, dropping connections.
|
||||
- A server is suffering from a high proportion of cache misses.
|
||||
- A server is not sending correct content.
|
||||
|
||||
A global application performance monitoring tool like New Relic or Dynatrace helps you monitor page load time from remote locations, while NGINX helps you monitor the application delivery side. Application performance data tells you when your optimizations are making a real difference to your users, and when you need to consider adding capacity to your infrastructure to sustain the traffic.
|
||||
|
||||
To help identify and resolve issues quickly, NGINX Plus adds [application-aware health checks][46] – synthetic transactions that are repeated regularly and are used to alert you to problems. NGINX Plus also has [session draining][47], which stops new connections while existing tasks complete, and a slow start capability, allowing a recovered server to come up to speed within a load-balanced group. When used effectively, health checks allow you to identify issues before they significantly impact the user experience, while session draining and slow start allow you to replace servers and ensure the process does not negatively affect perceived performance or uptime. The figure shows the built-in NGINX Plus [live activity monitoring][48] dashboard for a web infrastructure with servers, TCP connections, and caching.
|
||||
|
||||
|
||||
|
||||
### Conclusion: Seeing 10x Performance Improvement ###
|
||||
|
||||
The performance improvements that are available for any one web application vary tremendously, and actual gains depend on your budget, the time you can invest, and gaps in your existing implementation. So, how might you achieve 10x performance improvement for your own applications?
|
||||
|
||||
To help guide you on the potential impact of each optimization, here are pointers to the improvement that may be possible with each tip detailed above, though your mileage will almost certainly vary:
|
||||
|
||||
- **Reverse proxy server and load balancing**. No load balancing, or poor load balancing, can cause episodes of very poor performance. Adding a reverse proxy server, such as NGINX, can prevent web applications from thrashing between memory and disk. Load balancing can move processing from overburdened servers to available ones and make scaling easy. These changes can result in dramatic performance improvement, with a 10x improvement easily achieved compared to the worst moments for your current implementation, and lesser but substantial achievements available for overall performance.
|
||||
- **Caching dynamic and static content**. If you have an overburdened web server that’s doubling as your application server, 10x improvements in peak-time performance can be achieved by caching dynamic content alone. Caching for static files can improve performance by single-digit multiples as well.
|
||||
- **Compressing data**. Using media file compression such as JPEG for photos, PNG for graphics, MPEG-4 for movies, and MP3 for music files can greatly improve performance. Once these are all in use, then compressing text data (code and HTML) can improve initial page load times by a factor of two.
|
||||
- **Optimizing SSL/TLS**. Secure handshakes can have a big impact on performance, so optimizing them can lead to perhaps a 2x improvement in initial responsiveness, particularly for text-heavy sites. Optimizing media file transmission under SSL/TLS is likely to yield only small performance improvements.
|
||||
- **Implementing HTTP/2 and SPDY**. When used with SSL/TLS, these protocols are likely to result in incremental improvements for overall site performance.
|
||||
- **Tuning Linux and web server software (such as NGINX)**. Fixes such as optimizing buffering, using keepalive connections, and offloading time-intensive tasks to a separate thread pool can significantly boost performance; thread pools, for instance, can speed disk-intensive tasks by [nearly an order of magnitude][49].
|
||||
|
||||
We hope you try out these techniques for yourself. We want to hear the kind of application performance improvements you’re able to achieve. Share your results in the comments below, or tweet your story with the hash tags #NGINX and #webperf!
|
||||
|
||||
### Resources for Internet Statistics ###
|
||||
|
||||
[Statista.com – Share of the internet economy in the gross domestic product in G-20 countries in 2016][50]
|
||||
|
||||
[Load Impact – How Bad Performance Impacts Ecommerce Sales][51]
|
||||
|
||||
[Kissmetrics – How Loading Time Affects Your Bottom Line (infographic)][52]
|
||||
|
||||
[Econsultancy – Site speed: case studies, tips and tools for improving your conversion rate][53]
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://www.nginx.com/blog/10-tips-for-10x-application-performance/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io
|
||||
|
||||
作者：[Floyd Smith][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://www.nginx.com/blog/author/floyd/
|
||||
[1]:https://www.nginx.com/resources/glossary/reverse-proxy-server
|
||||
[2]:https://www.nginx.com/blog/10-tips-for-10x-application-performance/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io#tip2
|
||||
[3]:https://www.nginx.com/blog/10-tips-for-10x-application-performance/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io#tip3
|
||||
[4]:https://www.nginx.com/products/application-health-checks/
|
||||
[5]:https://www.nginx.com/solutions/load-balancing/
|
||||
[6]:https://www.nginx.com/blog/10-tips-for-10x-application-performance/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io#tip1
|
||||
[7]:https://www.nginx.com/resources/admin-guide/load-balancer/
|
||||
[8]:https://www.nginx.com/blog/load-balancing-with-nginx-plus/
|
||||
[9]:https://www.digitalocean.com/community/tutorials/understanding-and-implementing-fastcgi-proxying-in-nginx
|
||||
[10]:https://www.nginx.com/blog/five-reasons-use-software-load-balancer/
|
||||
[11]:https://www.nginx.com/blog/load-balancing-with-nginx-plus/
|
||||
[12]:https://www.nginx.com/resources/ebook/five-reasons-choose-software-load-balancer/
|
||||
[13]:https://www.nginx.com/resources/webinars/choose-software-based-load-balancer-45-min/
|
||||
[14]:https://www.nginx.com/resources/admin-guide/load-balancer/
|
||||
[15]:https://www.nginx.com/products/
|
||||
[16]:https://www.nginx.com/blog/nginx-caching-guide/
|
||||
[17]:https://www.nginx.com/products/content-caching-nginx-plus/
|
||||
[18]:http://nginx.org/en/docs/http/ngx_http_proxy_module.html?&_ga=1.95342300.1348073562.1438712874#proxy_cache_purge
|
||||
[19]:https://www.nginx.com/products/live-activity-monitoring/
|
||||
[20]:http://nginx.org/en/docs/http/ngx_http_proxy_module.html?&&&_ga=1.61156076.1348073562.1438712874#proxy_cache
|
||||
[21]:https://www.nginx.com/resources/admin-guide/content-caching
|
||||
[22]:https://www.nginx.com/blog/network-vs-devops-how-to-manage-your-control-issues/
|
||||
[23]:https://www.nginx.com/blog/10-tips-for-10x-application-performance/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io#tip6
|
||||
[24]:https://www.nginx.com/resources/admin-guide/compression-and-decompression/
|
||||
[25]:http://nginx.org/en/docs/http/ngx_http_gzip_static_module.html
|
||||
[26]:https://www.digicert.com/ssl.htm
|
||||
[27]:https://www.nginx.com/blog/10-tips-for-10x-application-performance/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io#tip6
|
||||
[28]:http://openssl.org/
|
||||
[29]:https://www.nginx.com/blog/nginx-ssl-performance/
|
||||
[30]:https://www.nginx.com/blog/improve-seo-https-nginx/
|
||||
[31]:http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache
|
||||
[32]:https://www.nginx.com/resources/admin-guide/nginx-ssl-termination/
|
||||
[33]:https://www.nginx.com/resources/admin-guide/nginx-tcp-ssl-termination/
|
||||
[34]:https://www.nginx.com/resources/datasheet/datasheet-nginx-http2-whitepaper/
|
||||
[35]:http://w3techs.com/blog/entry/25_percent_of_the_web_runs_nginx_including_46_6_percent_of_the_top_10000_sites
|
||||
[36]:https://www.nginx.com/blog/how-nginx-plans-to-support-http2/
|
||||
[37]:https://www.nginx.com/blog/nginx-plus-r7-released/
|
||||
[38]:http://nginx.org/en/download.html
|
||||
[39]:https://www.nginx.com/products/
|
||||
[40]:https://www.nginx.com/blog/tuning-nginx/
|
||||
[41]:https://www.nginx.com/blog/http-keepalives-and-web-performance/
|
||||
[42]:http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffering
|
||||
[43]:https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/
|
||||
[44]:https://www.nginx.com/blog/thread-pools-boost-performance-9x/
|
||||
[45]:https://www.nginx.com/blog/tuning-nginx/
|
||||
[46]:https://www.nginx.com/products/application-health-checks/
|
||||
[47]:https://www.nginx.com/products/session-persistence/#session-draining
|
||||
[48]:https://www.nginx.com/products/live-activity-monitoring/
|
||||
[49]:https://www.nginx.com/blog/thread-pools-boost-performance-9x/
|
||||
[50]:http://www.statista.com/statistics/250703/forecast-of-internet-economy-as-percentage-of-gdp-in-g-20-countries/
|
||||
[51]:http://blog.loadimpact.com/blog/how-bad-performance-impacts-ecommerce-sales-part-i/
|
||||
[52]:https://blog.kissmetrics.com/loading-time/?wide=1
|
||||
[53]:https://econsultancy.com/blog/10936-site-speed-case-studies-tips-and-tools-for-improving-your-conversion-rate/
|
||||
@ -1,319 +0,0 @@
|
||||
ictlyh Translating
|
||||
Install PostgreSQL 9.4 And phpPgAdmin On Ubuntu 15.10
|
||||
================================================================================
|
||||
|
||||
|
||||
### Introduction ###
|
||||
|
||||
[PostgreSQL][1] is a powerful, open-source object-relational database system. It runs under all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS, Solaris, Tru64), and Windows OS.
|
||||
|
||||
Here is what **Mark Shuttleworth**, the founder of **Ubuntu**, says about PostgreSQL.
|
||||
|
||||
> Postgres is a truly awesome database. When we started working on Launchpad I wasn’t sure if it would be up to the job. I was so wrong. It’s been robust, fast, and professional in every regard.
|
||||
>
|
||||
> — Mark Shuttleworth.
|
||||
|
||||
In this handy tutorial, let us see how to install PostgreSQL 9.4 on Ubuntu 15.10 server.
|
||||
|
||||
### Install PostgreSQL ###
|
||||
|
||||
PostgreSQL is available in the default repositories. So enter the following command from the Terminal to install it.
|
||||
|
||||
sudo apt-get install postgresql postgresql-contrib
|
||||
|
||||
If you’re looking for other versions, add the PostgreSQL repository, and install it as shown below.
|
||||
|
||||
The **PostgreSQL apt repository** supports LTS versions of Ubuntu (10.04, 12.04 and 14.04) on amd64 and i386 architectures as well as select non-LTS versions(14.10). While not fully supported, the packages often work on other non-LTS versions as well, by using the closest LTS version available.
|
||||
|
||||
#### On Ubuntu 14.10 systems: ####
|
||||
|
||||
Create the file **/etc/apt/sources.list.d/pgdg.list**;
|
||||
|
||||
sudo vi /etc/apt/sources.list.d/pgdg.list
|
||||
|
||||
Add a line for the repository:
|
||||
|
||||
deb http://apt.postgresql.org/pub/repos/apt/ utopic-pgdg main
|
||||
|
||||
**Note**: The above repository will only work on Ubuntu 14.10. It is not updated yet to Ubuntu 15.04 and 15.10.
|
||||
|
||||
**On Ubuntu 14.04**, add the following line:
|
||||
|
||||
deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main
|
||||
|
||||
**On Ubuntu 12.04**, add the following line:
|
||||
|
||||
deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main
|
||||
|
||||
Import the repository signing key:
|
||||
|
||||
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc
|
||||
|
||||
----------
|
||||
|
||||
sudo apt-key add -
|
||||
|
||||
Update the package lists:
|
||||
|
||||
sudo apt-get update
|
||||
|
||||
Then install the required version.
|
||||
|
||||
sudo apt-get install postgresql-9.4
|
||||
|
||||
### Accessing PostgreSQL command prompt ###
|
||||
|
||||
The default database name and database user are “**postgres**”. Switch to postgres user to perform postgresql related operations:
|
||||
|
||||
sudo -u postgres psql postgres
|
||||
|
||||
#### Sample Output: ####
|
||||
|
||||
psql (9.4.5)
|
||||
Type "help" for help.
|
||||
postgres=#
|
||||
|
||||
To exit from posgresql prompt, type **\q** in the **psql** prompt return back to the Terminal.
|
||||
|
||||
### Set “postgres” user password ###
|
||||
|
||||
Login to postgresql prompt,
|
||||
|
||||
sudo -u postgres psql postgres
|
||||
|
||||
.. and set postgres password with following command:
|
||||
|
||||
postgres=# \password postgres
|
||||
Enter new password:
|
||||
Enter it again:
|
||||
postgres=# \q
|
||||
|
||||
To install PostgreSQL Adminpack, enter the command in postgresql prompt:
|
||||
|
||||
sudo -u postgres psql postgres
|
||||
|
||||
----------
|
||||
|
||||
postgres=# CREATE EXTENSION adminpack;
|
||||
CREATE EXTENSION
|
||||
|
||||
Type **\q** in the **psql** prompt to exit from posgresql prompt, and return back to the Terminal.
|
||||
|
||||
### Create New User and Database ###
|
||||
|
||||
For example, let us create a new user called “**senthil**” with password “**ubuntu**”, and database called “**mydb**”.
|
||||
|
||||
sudo -u postgres createuser -D -A -P senthil
|
||||
|
||||
----------
|
||||
|
||||
sudo -u postgres createdb -O senthil mydb
|
||||
|
||||
### Delete Users and Databases ###
|
||||
|
||||
To delete the database, switch to postgres user:
|
||||
|
||||
sudo -u postgres psql postgres
|
||||
|
||||
Enter command:
|
||||
|
||||
$ drop database <database-name>
|
||||
|
||||
To delete a user, enter the following command:
|
||||
|
||||
$ drop user <user-name>
|
||||
|
||||
### Configure PostgreSQL-MD5 Authentication ###
|
||||
|
||||
**MD5 authentication** requires the client to supply an MD5-encrypted password for authentication. To do that, edit **/etc/postgresql/9.4/main/pg_hba.conf** file:
|
||||
|
||||
sudo vi /etc/postgresql/9.4/main/pg_hba.conf
|
||||
|
||||
Add or Modify the lines as shown below
|
||||
|
||||
[...]
|
||||
# TYPE DATABASE USER ADDRESS METHOD
|
||||
# "local" is for Unix domain socket connections only
|
||||
local all all md5
|
||||
# IPv4 local connections:
|
||||
host all all 127.0.0.1/32 md5
|
||||
host all all 192.168.1.0/24 md5
|
||||
# IPv6 local connections:
|
||||
host all all ::1/128 md5
|
||||
[...]
|
||||
|
||||
Here, 192.168.1.0/24 is my local network IP address. Replace this value with your own address.
|
||||
|
||||
Restart postgresql service to apply the changes:
|
||||
|
||||
sudo systemctl restart postgresql
|
||||
|
||||
Or,
|
||||
|
||||
sudo service postgresql restart
|
||||
|
||||
### Configure PostgreSQL-Configure TCP/IP ###
|
||||
|
||||
By default, TCP/IP connection is disabled, so that the users from another computers can’t access postgresql. To allow to connect users from another computers, Edit file **/etc/postgresql/9.4/main/postgresql.conf:**
|
||||
|
||||
sudo vi /etc/postgresql/9.4/main/postgresql.conf
|
||||
|
||||
Find the lines:
|
||||
|
||||
[...]
|
||||
#listen_addresses = 'localhost'
|
||||
[...]
|
||||
#port = 5432
|
||||
[...]
|
||||
|
||||
Uncomment both lines, and set the IP address of your postgresql server or set ‘*’ to listen from all clients as shown below. You should be careful to make postgreSQL to be accessible from all remote clients.
|
||||
|
||||
[...]
|
||||
listen_addresses = '*'
|
||||
[...]
|
||||
port = 5432
|
||||
[...]
|
||||
|
||||
Restart postgresql service to save changes:
|
||||
|
||||
sudo systemctl restart postgresql
|
||||
|
||||
Or,
|
||||
|
||||
sudo service postgresql restart
|
||||
|
||||
### Manage PostgreSQL with phpPgAdmin ###
|
||||
|
||||
[**phpPgAdmin**][2] is a web-based administration utility written in PHP for managing PosgreSQL.
|
||||
|
||||
phpPgAdmin is available in default repositories. So, Install phpPgAdmin using command:
|
||||
|
||||
sudo apt-get install phppgadmin
|
||||
|
||||
By default, you can access phppgadmin using **http://localhost/phppgadmin** from your local system’s web browser.
|
||||
|
||||
To access remote systems, do the following.
|
||||
On Ubuntu 15.10 systems:
|
||||
|
||||
Edit file **/etc/apache2/conf-available/phppgadmin.conf**,
|
||||
|
||||
sudo vi /etc/apache2/conf-available/phppgadmin.conf
|
||||
|
||||
Find the line **Require local** and comment it by adding a **#** in front of the line.
|
||||
|
||||
#Require local
|
||||
|
||||
And add the following line:
|
||||
|
||||
allow from all
|
||||
|
||||
Save and exit the file.
|
||||
|
||||
Then, restart apache service.
|
||||
|
||||
sudo systemctl restart apache2
|
||||
|
||||
On Ubuntu 14.10 and previous versions:
|
||||
|
||||
Edit file **/etc/apache2/conf.d/phppgadmin**:
|
||||
|
||||
sudo nano /etc/apache2/conf.d/phppgadmin
|
||||
|
||||
Comment the following line:
|
||||
|
||||
[...]
|
||||
#allow from 127.0.0.0/255.0.0.0 ::1/128
|
||||
|
||||
Uncomment the following line to make phppgadmin from all systems.
|
||||
|
||||
allow from all
|
||||
|
||||
Edit **/etc/apache2/apache2.conf**:
|
||||
|
||||
sudo vi /etc/apache2/apache2.conf
|
||||
|
||||
Add the following line:
|
||||
|
||||
Include /etc/apache2/conf.d/phppgadmin
|
||||
|
||||
Then, restart apache service.
|
||||
|
||||
sudo service apache2 restart
|
||||
|
||||
### Configure phpPgAdmin ###
|
||||
|
||||
Edit file **/etc/phppgadmin/config.inc.php**, and do the following changes. Most of these options are self-explanatory. Read them carefully to know why do you change these values.
|
||||
|
||||
sudo nano /etc/phppgadmin/config.inc.php
|
||||
|
||||
Find the following line:
|
||||
|
||||
$conf['servers'][0]['host'] = '';
|
||||
|
||||
Change it as shown below:
|
||||
|
||||
$conf['servers'][0]['host'] = 'localhost';
|
||||
|
||||
And find the line:
|
||||
|
||||
$conf['extra_login_security'] = true;
|
||||
|
||||
Change the value to **false**.
|
||||
|
||||
$conf['extra_login_security'] = false;
|
||||
|
||||
Find the line:
|
||||
|
||||
$conf['owned_only'] = false;
|
||||
|
||||
Set the value as **true**.
|
||||
|
||||
$conf['owned_only'] = true;
|
||||
|
||||
Save and close the file. Restart postgresql service and Apache services.
|
||||
|
||||
sudo systemctl restart postgresql
|
||||
|
||||
----------
|
||||
|
||||
sudo systemctl restart apache2
|
||||
|
||||
Or,
|
||||
|
||||
sudo service postgresql restart
|
||||
|
||||
sudo service apache2 restart
|
||||
|
||||
Now open your browser and navigate to **http://ip-address/phppgadmin**. You will see the following screen.
|
||||
|
||||
|
||||
|
||||
Login with users that you’ve created earlier. I already have created a user called “**senthil**” with password “**ubuntu**” before, so I log in with user “senthil”.
|
||||
|
||||
|
||||
|
||||
Now, you will be able to access the phppgadmin dashboard.
|
||||
|
||||
|
||||
|
||||
Log in with postgres user:
|
||||
|
||||
|
||||
|
||||
That’s it. Now you’ll able to create, delete and alter databases graphically using phppgadmin.
|
||||
|
||||
Cheers!
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.unixmen.com/install-postgresql-9-4-and-phppgadmin-on-ubuntu-15-10/
|
||||
|
||||
作者：[SK][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.twitter.com/ostechnix
|
||||
[1]:http://www.postgresql.org/
|
||||
[2]:http://phppgadmin.sourceforge.net/doku.php
|
||||
@ -1,330 +0,0 @@
|
||||
translating by ezio
|
||||
|
||||
Going Beyond Hello World Containers is Hard Stuff
|
||||
================================================================================
|
||||
In [my previous post][1], I provided the basic concepts behind Linux container technology. I wrote as much for you as I did for me. Containers are new to me. And I figured having the opportunity to blog about the subject would provide the motivation to really learn the stuff.
|
||||
|
||||
I intend to learn by doing. First get the concepts down, then get hands-on and write about it as I go. I assumed there must be a lot of Hello World type stuff out there to give me up to speed with the basics. Then, I could take things a bit further and build a microservice container or something.
|
||||
|
||||
I mean, it can’t be that hard, right?
|
||||
|
||||
Wrong.
|
||||
|
||||
Maybe it’s easy for someone who spends significant amount of their life immersed in operations work. But for me, getting started with this stuff turned out to be hard to the point of posting my frustrations to Facebook...
|
||||
|
||||
But, there is good news: I got it to work! And it’s always nice being able to make lemonade from lemons. So I am going to share the story of how I made my first microservice container with you. Maybe my pain will save you some time.
|
||||
|
||||
If you've ever found yourself in a situation like this, fear not: folks like me are here to deal with the problems so you don't have to!
|
||||
|
||||
Let’s begin.
|
||||
|
||||
### A Thumbnail Micro Service ###
|
||||
|
||||
The microservice I designed was simple in concept. Post a digital image in JPG or PNG format to an HTTP endpoint and get back a a 100px wide thumbnail.
|
||||
|
||||
Here’s what that looks like:
|
||||
|
||||
|
||||
|
||||
I decide to use a NodeJS for my code and version of [ImageMagick][2] to do the thumbnail transformation.
|
||||
|
||||
I did my first version of the service, using the logic shown here:
|
||||
|
||||
|
||||
|
||||
I download the [Docker Toolbox][3] which installs an the Docker Quickstart Terminal. Docker Quickstart Terminal makes creating containers easier. The terminal fires up a Linux virtual machine that has Docker installed, allowing you to run Docker commands from within a terminal.
|
||||
|
||||
In my case, I am running on OS X. But there’s a Windows version too.
|
||||
|
||||
I am going to use Docker Quickstart Terminal to build a container image for my microservice and run a container from that image.
|
||||
|
||||
The Docker Quickstart Terminal runs in your regular terminal, like so:
|
||||
|
||||
|
||||
|
||||
### The First Little Problem and the First Big Problem ###
|
||||
|
||||
So I fiddled around with NodeJS and ImageMagick and I got the service to work on my local machine.
|
||||
|
||||
Then, I created the Dockerfile, which is the configuration script Docker uses to build your container. (I’ll go more into builds and Dockerfile more later on.)
|
||||
|
||||
Here’s the build command I ran on the Docker Quickstart Terminal:
|
||||
|
||||
$ docker build -t thumbnailer:0.1
|
||||
|
||||
I got this response:
|
||||
|
||||
docker: "build" requires 1 argument.
|
||||
|
||||
Huh.
|
||||
|
||||
After 15 minutes I realized: I forgot to put a period . as the last argument!
|
||||
|
||||
It needs to be:
|
||||
|
||||
$ docker build -t thumbnailer:0.1 .
|
||||
|
||||
But this wasn’t the end of my problems.
|
||||
|
||||
I got the image to build and then I typed [the the `run` command][4] on the Docker Quickstart Terminal to fire up a container based on the image, called `thumbnailer:0.1`:
|
||||
|
||||
$ docker run -d -p 3001:3000 thumbnailer:0.1
|
||||
|
||||
The `-p 3001:3000` argument makes it so the NodeJS microservice running on port 3000 within the container binds to port 3001 on the host virtual machine.
|
||||
|
||||
Looks so good so far, right?
|
||||
|
||||
Wrong. Things are about to get pretty bad.
|
||||
|
||||
I determined the IP address of the virtual machine created by Docker Quickstart Terminal by running the `docker-machine` command:
|
||||
|
||||
$ docker-machine ip default
|
||||
|
||||
This returns the IP address of the default virtual machine, the one that is run under the Docker Quickstart Terminal. For me, this IP address was 192.168.99.100.
|
||||
|
||||
I browsed to http://192.168.99.100:3001/ and got the file upload page I built:
|
||||
|
||||
|
||||
|
||||
I selected a file and clicked the Upload Image button.
|
||||
|
||||
But it didn’t work.
|
||||
|
||||
The terminal is telling me it can’t find the `/upload` directory my microservice requires.
|
||||
|
||||
Now, keep in mind, I had been at this for about a day—between the fiddling and research. I’m feeling a little frustrated by this point.
|
||||
|
||||
Then, a brain spark flew. Somewhere along the line remembered reading a microservice should not do any data persistence on its own! Saving data should be the job of another service.
|
||||
|
||||
So what if the container can’t find the `/upload` directory? The real issue is: my microservice has a fundamentally flawed design.
|
||||
|
||||
Let’s take another look:
|
||||
|
||||
|
||||
|
||||
Why am I saving a file to disk? Microservices are supposed to be fast. Why not do all my work in memory? Using memory buffers will make the "I can’t find no stickin’ directory" error go away and will increase the performance of my app dramatically.
|
||||
|
||||
So that’s what I did. And here’s what the plan was:
|
||||
|
||||
|
||||
|
||||
Here’s the NodeJS I wrote to do all the in-memory work for creating a thumbnail:
|
||||
|
||||
// Bind to the packages
|
||||
var express = require('express');
|
||||
var router = express.Router();
|
||||
var path = require('path'); // used for file path
|
||||
var im = require("imagemagick");
|
||||
|
||||
// Simple get that allows you test that you can access the thumbnail process
|
||||
router.get('/', function (req, res, next) {
|
||||
res.status(200).send('Thumbnailer processor is up and running');
|
||||
});
|
||||
|
||||
// This is the POST handler. It will take the uploaded file and make a thumbnail from the
|
||||
// submitted byte array. I know, it's not rocket science, but it serves a purpose
|
||||
router.post('/', function (req, res, next) {
|
||||
req.pipe(req.busboy);
|
||||
req.busboy.on('file', function (fieldname, file, filename) {
|
||||
var ext = path.extname(filename)
|
||||
|
||||
// Make sure that only png and jpg is allowed
|
||||
if(ext.toLowerCase() != '.jpg' && ext.toLowerCase() != '.png'){
|
||||
res.status(406).send("Service accepts only jpg or png files");
|
||||
}
|
||||
|
||||
var bytes = [];
|
||||
|
||||
// put the bytes from the request into a byte array
|
||||
file.on('data', function(data) {
|
||||
for (var i = 0; i < data.length; ++i) {
|
||||
bytes.push(data[i]);
|
||||
}
|
||||
console.log('File [' + fieldname + '] got bytes ' + bytes.length + ' bytes');
|
||||
});
|
||||
|
||||
// Once the request is finished pushing the file bytes into the array, put the bytes in
|
||||
// a buffer and process that buffer with the imagemagick resize function
|
||||
file.on('end', function() {
|
||||
var buffer = new Buffer(bytes,'binary');
|
||||
console.log('Bytes got ' + bytes.length + ' bytes');
|
||||
|
||||
//resize
|
||||
im.resize({
|
||||
srcData: buffer,
|
||||
height: 100
|
||||
}, function(err, stdout, stderr){
|
||||
if (err){
|
||||
throw err;
|
||||
}
|
||||
// get the extension without the period
|
||||
var typ = path.extname(filename).replace('.','');
|
||||
res.setHeader("content-type", "image/" + typ);
|
||||
res.status(200);
|
||||
// send the image back as a response
|
||||
res.send(new Buffer(stdout,'binary'));
|
||||
});
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
module.exports = router;
|
||||
|
||||
Okay, so we’re back on track and everything is hunky dory on my local machine. I go to sleep.
|
||||
|
||||
But, before I do I test the microservice code running as standard Node app on localhost...
|
||||
|
||||
|
||||
|
||||
It works fine. Now all I needed to do was get it working in a container.
|
||||
|
||||
The next day I woke up, grabbed some coffee, and built an image—not forgetting to put in the period!
|
||||
|
||||
$ docker build -t thumbnailer:01 .
|
||||
|
||||
I am building from the root directory of my thumbnailer project. The build command uses the Dockerfile that is in the root directory. That’s how it goes: put the Dockerfile in the same place you want to run build and the Dockerfile will be used by default.
|
||||
|
||||
Here is the text of the Dockerfile I was using:
|
||||
|
||||
FROM ubuntu:latest
|
||||
MAINTAINER bob@CogArtTech.com
|
||||
|
||||
RUN apt-get update
|
||||
RUN apt-get install -y nodejs nodejs-legacy npm
|
||||
RUN apt-get install imagemagick libmagickcore-dev libmagickwand-dev
|
||||
RUN apt-get clean
|
||||
|
||||
COPY ./package.json src/
|
||||
|
||||
RUN cd src && npm install
|
||||
|
||||
COPY . /src
|
||||
|
||||
WORKDIR src/
|
||||
|
||||
CMD npm start
|
||||
|
||||
What could go wrong?
|
||||
|
||||
### The Second Big Problem ###
|
||||
|
||||
I ran the `build` command and I got this error:
|
||||
|
||||
Do you want to continue? [Y/n] Abort.
|
||||
|
||||
The command '/bin/sh -c apt-get install imagemagick libmagickcore-dev libmagickwand-dev' returned a non-zero code: 1
|
||||
|
||||
I figured something was wrong with the microservice. I went back to my machine, fired up the service on localhost, and uploaded a file.
|
||||
|
||||
Then I got this error from NodeJS:
|
||||
|
||||
Error: spawn convert ENOENT
|
||||
|
||||
What’s going on? This worked the other night!
|
||||
|
||||
I searched and searched, for every permutation of the error I could think of. After about four hours of replacing different node modules here and there, I figured: why not restart the machine?
|
||||
|
||||
I did. And guess what? The error went away!
|
||||
|
||||
Go figure.
|
||||
|
||||
### Putting the Genie Back in the Bottle ###
|
||||
|
||||
So, back to the original quest: I needed to get this build working.
|
||||
|
||||
I removed all of the containers running on the VM, using [the `rm` command][5]:
|
||||
|
||||
$ docker rm -f $(docker ps -a -q)
|
||||
|
||||
The `-f` flag here force removes running images.
|
||||
|
||||
Then I removed all of my Docker images, using [the `rmi` command][6]:
|
||||
|
||||
$ docker rmi if $(docker images | tail -n +2 | awk '{print $3}')
|
||||
|
||||
I go through the whole process of rebuilding the image, installing the container and try to get the microservice running. Then after about an hour of self-doubt and accompanying frustration, I thought to myself: maybe this isn’t a problem with the microservice.
|
||||
|
||||
So, I looked that the the error again:
|
||||
|
||||
Do you want to continue? [Y/n] Abort.
|
||||
|
||||
The command '/bin/sh -c apt-get install imagemagick libmagickcore-dev libmagickwand-dev' returned a non-zero code: 1
|
||||
|
||||
Then it hit me: the build is looking for a Y input from the keyboard! But, this is a non-interactive Dockerfile script. There is no keyboard.
|
||||
|
||||
I went back to the Dockerfile, and there it was:
|
||||
|
||||
RUN apt-get update
|
||||
RUN apt-get install -y nodejs nodejs-legacy npm
|
||||
RUN apt-get install imagemagick libmagickcore-dev libmagickwand-dev
|
||||
RUN apt-get clean
|
||||
|
||||
The second `apt-get` command is missing the `-y` flag which causes "yes" to be given automatically where usually it would be prompted for.
|
||||
|
||||
I added the missing `-y` to the command:
|
||||
|
||||
RUN apt-get update
|
||||
RUN apt-get install -y nodejs nodejs-legacy npm
|
||||
RUN apt-get install -y imagemagick libmagickcore-dev libmagickwand-dev
|
||||
RUN apt-get clean
|
||||
|
||||
And guess what: after two days of trial and tribulation, it worked! Two whole days!
|
||||
|
||||
So, I did my build:
|
||||
|
||||
$ docker build -t thumbnailer:0.1 .
|
||||
|
||||
I fired up the container:
|
||||
|
||||
$ docker run -d -p 3001:3000 thumbnailer:0.1
|
||||
|
||||
Got the IP address of the Virtual Machine:
|
||||
|
||||
$ docker-machine ip default
|
||||
|
||||
Went to my browser and entered http://192.168.99.100:3001/ into the address bar.
|
||||
|
||||
The upload page loaded.
|
||||
|
||||
I selected an image, and this is what I got:
|
||||
|
||||
|
||||
|
||||
It worked!
|
||||
|
||||
Inside a container, for the first time!
|
||||
|
||||
### So What Does It All Mean? ###
|
||||
|
||||
A long time ago, I accepted the fact when it comes to tech, sometimes even the easy stuff is hard. Along with that, I abandoned the desire to be the smartest guy in the room. Still, the last few days trying get basic competency with containers has been, at times, a journey of self doubt.
|
||||
|
||||
But, you wanna know something? It’s 2 AM on an early morning as I write this, and every nerve wracking hour has been worth it. Why? Because you gotta put in the time. This stuff is hard and it does not come easy for anyone. And don’t forget: you’re learning tech and tech runs the world!
|
||||
|
||||
P.S. Check out this two part video of Hello World containers, check out [Raziel Tabib’s][7] excellent work in this video...
|
||||
|
||||
注：youtube视频
|
||||
<iframe width="560" height="315" src="https://www.youtube.com/embed/PJ95WY2DqXo" frameborder="0" allowfullscreen></iframe>
|
||||
|
||||
And don't miss part two...
|
||||
|
||||
注：youtube视频
|
||||
<iframe width="560" height="315" src="https://www.youtube.com/embed/lss2rZ3Ppuk" frameborder="0" allowfullscreen></iframe>
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://deis.com/blog/2015/beyond-hello-world-containers-hard-stuff
|
||||
|
||||
作者：[Bob Reselman][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://deis.com/blog
|
||||
[1]:http://deis.com/blog/2015/developer-journey-linux-containers
|
||||
[2]:https://github.com/rsms/node-imagemagick
|
||||
[3]:https://www.docker.com/toolbox
|
||||
[4]:https://docs.docker.com/reference/commandline/run/
|
||||
[5]:https://docs.docker.com/reference/commandline/rm/
|
||||
[6]:https://docs.docker.com/reference/commandline/rmi/
|
||||
[7]:http://twitter.com/RazielTabib
|
||||
@ -1,257 +0,0 @@
|
||||
Data Structures in the Linux Kernel
|
||||
================================================================================
|
||||
|
||||
Doubly linked list
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
Linux kernel provides its own implementation of doubly linked list, which you can find in the [include/linux/list.h](https://github.com/torvalds/linux/blob/master/include/linux/list.h). We will start `Data Structures in the Linux kernel` from the doubly linked list data structure. Why? Because it is very popular in the kernel, just try to [search](http://lxr.free-electrons.com/ident?i=list_head)
|
||||
|
||||
First of all, let's look on the main structure in the [include/linux/types.h](https://github.com/torvalds/linux/blob/master/include/linux/types.h):
|
||||
|
||||
```C
|
||||
struct list_head {
|
||||
struct list_head *next, *prev;
|
||||
};
|
||||
```
|
||||
|
||||
You can note that it is different from many implementations of doubly linked list which you have seen. For example, this doubly linked list structure from the [glib](http://www.gnu.org/software/libc/) library looks like :
|
||||
|
||||
```C
|
||||
struct GList {
|
||||
gpointer data;
|
||||
GList *next;
|
||||
GList *prev;
|
||||
};
|
||||
```
|
||||
|
||||
Usually a linked list structure contains a pointer to the item. The implementation of linked list in Linux kernel does not. So the main question is - `where does the list store the data?`. The actual implementation of linked list in the kernel is - `Intrusive list`. An intrusive linked list does not contain data in its nodes - A node just contains pointers to the next and previous node and list nodes part of the data that are added to the list. This makes the data structure generic, so it does not care about entry data type anymore.
|
||||
|
||||
For example:
|
||||
|
||||
```C
|
||||
struct nmi_desc {
|
||||
spinlock_t lock;
|
||||
struct list_head head;
|
||||
};
|
||||
```
|
||||
|
||||
Let's look at some examples to understand how `list_head` is used in the kernel. As I already wrote about, there are many, really many different places where lists are used in the kernel. Let's look for an example in miscellaneous character drivers. Misc character drivers API from the [drivers/char/misc.c](https://github.com/torvalds/linux/blob/master/drivers/char/misc.c) is used for writing small drivers for handling simple hardware or virtual devices. Those drivers share same major number:
|
||||
|
||||
```C
|
||||
#define MISC_MAJOR 10
|
||||
```
|
||||
|
||||
but have their own minor number. For example you can see it with:
|
||||
|
||||
```
|
||||
ls -l /dev | grep 10
|
||||
crw------- 1 root root 10, 235 Mar 21 12:01 autofs
|
||||
drwxr-xr-x 10 root root 200 Mar 21 12:01 cpu
|
||||
crw------- 1 root root 10, 62 Mar 21 12:01 cpu_dma_latency
|
||||
crw------- 1 root root 10, 203 Mar 21 12:01 cuse
|
||||
drwxr-xr-x 2 root root 100 Mar 21 12:01 dri
|
||||
crw-rw-rw- 1 root root 10, 229 Mar 21 12:01 fuse
|
||||
crw------- 1 root root 10, 228 Mar 21 12:01 hpet
|
||||
crw------- 1 root root 10, 183 Mar 21 12:01 hwrng
|
||||
crw-rw----+ 1 root kvm 10, 232 Mar 21 12:01 kvm
|
||||
crw-rw---- 1 root disk 10, 237 Mar 21 12:01 loop-control
|
||||
crw------- 1 root root 10, 227 Mar 21 12:01 mcelog
|
||||
crw------- 1 root root 10, 59 Mar 21 12:01 memory_bandwidth
|
||||
crw------- 1 root root 10, 61 Mar 21 12:01 network_latency
|
||||
crw------- 1 root root 10, 60 Mar 21 12:01 network_throughput
|
||||
crw-r----- 1 root kmem 10, 144 Mar 21 12:01 nvram
|
||||
brw-rw---- 1 root disk 1, 10 Mar 21 12:01 ram10
|
||||
crw--w---- 1 root tty 4, 10 Mar 21 12:01 tty10
|
||||
crw-rw---- 1 root dialout 4, 74 Mar 21 12:01 ttyS10
|
||||
crw------- 1 root root 10, 63 Mar 21 12:01 vga_arbiter
|
||||
crw------- 1 root root 10, 137 Mar 21 12:01 vhci
|
||||
```
|
||||
|
||||
Now let's have a close look at how lists are used in the misc device drivers. First of all, let's look on `miscdevice` structure:
|
||||
|
||||
```C
|
||||
struct miscdevice
|
||||
{
|
||||
int minor;
|
||||
const char *name;
|
||||
const struct file_operations *fops;
|
||||
struct list_head list;
|
||||
struct device *parent;
|
||||
struct device *this_device;
|
||||
const char *nodename;
|
||||
mode_t mode;
|
||||
};
|
||||
```
|
||||
|
||||
We can see the fourth field in the `miscdevice` structure - `list` which is a list of registered devices. In the beginning of the source code file we can see the definition of misc_list:
|
||||
|
||||
```C
|
||||
static LIST_HEAD(misc_list);
|
||||
```
|
||||
|
||||
which expands to the definition of variables with `list_head` type:
|
||||
|
||||
```C
|
||||
#define LIST_HEAD(name) \
|
||||
struct list_head name = LIST_HEAD_INIT(name)
|
||||
```
|
||||
|
||||
and initializes it with the `LIST_HEAD_INIT` macro, which sets previous and next entries with the address of variable - name:
|
||||
|
||||
```C
|
||||
#define LIST_HEAD_INIT(name) { &(name), &(name) }
|
||||
```
|
||||
|
||||
Now let's look on the `misc_register` function which registers a miscellaneous device. At the start it initializes `miscdevice->list` with the `INIT_LIST_HEAD` function:
|
||||
|
||||
```C
|
||||
INIT_LIST_HEAD(&misc->list);
|
||||
```
|
||||
|
||||
which does the same as the `LIST_HEAD_INIT` macro:
|
||||
|
||||
```C
|
||||
static inline void INIT_LIST_HEAD(struct list_head *list)
|
||||
{
|
||||
list->next = list;
|
||||
list->prev = list;
|
||||
}
|
||||
```
|
||||
|
||||
In the next step after a device is created by the `device_create` function, we add it to the miscellaneous devices list with:
|
||||
|
||||
```
|
||||
list_add(&misc->list, &misc_list);
|
||||
```
|
||||
|
||||
Kernel `list.h` provides this API for the addition of a new entry to the list. Let's look at its implementation:
|
||||
|
||||
```C
|
||||
static inline void list_add(struct list_head *new, struct list_head *head)
|
||||
{
|
||||
__list_add(new, head, head->next);
|
||||
}
|
||||
```
|
||||
|
||||
It just calls internal function `__list_add` with the 3 given parameters:
|
||||
|
||||
* new - new entry.
|
||||
* head - list head after which the new item will be inserted.
|
||||
* head->next - next item after list head.
|
||||
|
||||
Implementation of the `__list_add` is pretty simple:
|
||||
|
||||
```C
|
||||
static inline void __list_add(struct list_head *new,
|
||||
struct list_head *prev,
|
||||
struct list_head *next)
|
||||
{
|
||||
next->prev = new;
|
||||
new->next = next;
|
||||
new->prev = prev;
|
||||
prev->next = new;
|
||||
}
|
||||
```
|
||||
|
||||
Here we add a new item between `prev` and `next`. So `misc` list which we defined at the start with the `LIST_HEAD_INIT` macro will contain previous and next pointers to the `miscdevice->list`.
|
||||
|
||||
There is still one question: how to get list's entry. There is a special macro:
|
||||
|
||||
```C
|
||||
#define list_entry(ptr, type, member) \
|
||||
container_of(ptr, type, member)
|
||||
```
|
||||
|
||||
which gets three parameters:
|
||||
|
||||
* ptr - the structure list_head pointer;
|
||||
* type - structure type;
|
||||
* member - the name of the list_head within the structure;
|
||||
|
||||
For example:
|
||||
|
||||
```C
|
||||
const struct miscdevice *p = list_entry(v, struct miscdevice, list)
|
||||
```
|
||||
|
||||
After this we can access to any `miscdevice` field with `p->minor` or `p->name` and etc... Let's look on the `list_entry` implementation:
|
||||
|
||||
```C
|
||||
#define list_entry(ptr, type, member) \
|
||||
container_of(ptr, type, member)
|
||||
```
|
||||
|
||||
As we can see it just calls `container_of` macro with the same arguments. At first sight, the `container_of` looks strange:
|
||||
|
||||
```C
|
||||
#define container_of(ptr, type, member) ({ \
|
||||
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
|
||||
(type *)( (char *)__mptr - offsetof(type,member) );})
|
||||
```
|
||||
|
||||
First of all you can note that it consists of two expressions in curly brackets. The compiler will evaluate the whole block in the curly braces and use the value of the last expression.
|
||||
|
||||
For example:
|
||||
|
||||
```
|
||||
#include <stdio.h>
|
||||
|
||||
int main() {
|
||||
int i = 0;
|
||||
printf("i = %d\n", ({++i; ++i;}));
|
||||
return 0;
|
||||
}
|
||||
```
|
||||
|
||||
will print `2`.
|
||||
|
||||
The next point is `typeof`, it's simple. As you can understand from its name, it just returns the type of the given variable. When I first saw the implementation of the `container_of` macro, the strangest thing I found was the zero in the `((type *)0)` expression. Actually this pointer magic calculates the offset of the given field from the address of the structure, but as we have `0` here, it will be just a zero offset along with the field width. Let's look at a simple example:
|
||||
|
||||
```C
|
||||
#include <stdio.h>
|
||||
|
||||
struct s {
|
||||
int field1;
|
||||
char field2;
|
||||
char field3;
|
||||
};
|
||||
|
||||
int main() {
|
||||
printf("%p\n", &((struct s*)0)->field3);
|
||||
return 0;
|
||||
}
|
||||
```
|
||||
|
||||
will print `0x5`.
|
||||
|
||||
The next `offsetof` macro calculates offset from the beginning of the structure to the given structure's field. Its implementation is very similar to the previous code:
|
||||
|
||||
```C
|
||||
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
|
||||
```
|
||||
|
||||
Let's summarize all about `container_of` macro. The `container_of` macro returns the address of the structure by the given address of the structure's field with `list_head` type, the name of the structure field with `list_head` type and type of the container structure. At the first line this macro declares the `__mptr` pointer which points to the field of the structure that `ptr` points to and assigns `ptr` to it. Now `ptr` and `__mptr` point to the same address. Technically we don't need this line but it's useful for type checking. The first line ensures that the given structure (`type` parameter) has a member called `member`. In the second line it calculates offset of the field from the structure with the `offsetof` macro and subtracts it from the structure address. That's all.
|
||||
|
||||
Of course `list_add` and `list_entry` is not the only functions which `<linux/list.h>` provides. Implementation of the doubly linked list provides the following API:
|
||||
|
||||
* list_add
|
||||
* list_add_tail
|
||||
* list_del
|
||||
* list_replace
|
||||
* list_move
|
||||
* list_is_last
|
||||
* list_empty
|
||||
* list_cut_position
|
||||
* list_splice
|
||||
* list_for_each
|
||||
* list_for_each_entry
|
||||
|
||||
and many more.
|
||||
|
||||
|
||||
via: https://github.com/0xAX/linux-insides/edit/master/DataStructures/dlist.md
|
||||
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
@ -1,3 +1,4 @@
|
||||
ictlyh Translating
|
||||
Assign Multiple IP Addresses To One Interface On Ubuntu 15.10
|
||||
================================================================================
|
||||
Some times you might want to use more than one IP address for your network interface card. What will you do in such cases? Buy an extra network card and assign new IP? No, It’s not necessary(at least in the small networks). We can now assign multiple IP addresses to one interface on Ubuntu systems. Curious to know how? Well, Follow me, It is not that difficult.
|
||||
|
||||
201
sources/tech/20151123 Data Structures in the Linux Kernel.md
Normal file
201
sources/tech/20151123 Data Structures in the Linux Kernel.md
Normal file
@ -0,0 +1,201 @@
|
||||
Data Structures in the Linux Kernel
|
||||
================================================================================
|
||||
|
||||
Radix tree
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
As you already know linux kernel provides many different libraries and functions which implement different data structures and algorithms. In this part we will consider one of these data structures - [Radix tree](http://en.wikipedia.org/wiki/Radix_tree). There are two files which are related to `radix tree` implementation and API in the linux kernel:
|
||||
|
||||
* [include/linux/radix-tree.h](https://github.com/torvalds/linux/blob/master/include/linux/radix-tree.h)
|
||||
* [lib/radix-tree.c](https://github.com/torvalds/linux/blob/master/lib/radix-tree.c)
|
||||
|
||||
Lets talk about what a `radix tree` is. Radix tree is a `compressed trie` where a [trie](http://en.wikipedia.org/wiki/Trie) is a data structure which implements an interface of an associative array and allows to store values as `key-value`. The keys are usually strings, but any data type can be used. A trie is different from an `n-tree` because of its nodes. Nodes of a trie do not store keys; instead, a node of a trie stores single character labels. The key which is related to a given node is derived by traversing from the root of the tree to this node. For example:
|
||||
|
||||
|
||||
```
|
||||
+-----------+
|
||||
| |
|
||||
| " " |
|
||||
| |
|
||||
+------+-----------+------+
|
||||
| |
|
||||
| |
|
||||
+----v------+ +-----v-----+
|
||||
| | | |
|
||||
| g | | c |
|
||||
| | | |
|
||||
+-----------+ +-----------+
|
||||
| |
|
||||
| |
|
||||
+----v------+ +-----v-----+
|
||||
| | | |
|
||||
| o | | a |
|
||||
| | | |
|
||||
+-----------+ +-----------+
|
||||
|
|
||||
|
|
||||
+-----v-----+
|
||||
| |
|
||||
| t |
|
||||
| |
|
||||
+-----------+
|
||||
```
|
||||
|
||||
So in this example, we can see the `trie` with keys, `go` and `cat`. The compressed trie or `radix tree` differs from `trie` in that all intermediates nodes which have only one child are removed.
|
||||
|
||||
Radix tree in linux kernel is the datastructure which maps values to integer keys. It is represented by the following structures from the file [include/linux/radix-tree.h](https://github.com/torvalds/linux/blob/master/include/linux/radix-tree.h):
|
||||
|
||||
```C
|
||||
struct radix_tree_root {
|
||||
unsigned int height;
|
||||
gfp_t gfp_mask;
|
||||
struct radix_tree_node __rcu *rnode;
|
||||
};
|
||||
```
|
||||
|
||||
This structure presents the root of a radix tree and contains three fields:
|
||||
|
||||
* `height` - height of the tree;
|
||||
* `gfp_mask` - tells how memory allocations will be performed;
|
||||
* `rnode` - pointer to the child node.
|
||||
|
||||
The first field we will discuss is `gfp_mask`:
|
||||
|
||||
Low-level kernel memory allocation functions take a set of flags as - `gfp_mask`, which describes how that allocation is to be performed. These `GFP_` flags which control the allocation process can have following values: (`GF_NOIO` flag) means sleep and wait for memory, (`__GFP_HIGHMEM` flag) means high memory can be used, (`GFP_ATOMIC` flag) means the allocation process has high-priority and can't sleep etc.
|
||||
|
||||
* `GFP_NOIO` - can sleep and wait for memory;
|
||||
* `__GFP_HIGHMEM` - high memory can be used;
|
||||
* `GFP_ATOMIC` - allocation process is high-priority and can't sleep;
|
||||
|
||||
etc.
|
||||
|
||||
The next field is `rnode`:
|
||||
|
||||
```C
|
||||
struct radix_tree_node {
|
||||
unsigned int path;
|
||||
unsigned int count;
|
||||
union {
|
||||
struct {
|
||||
struct radix_tree_node *parent;
|
||||
void *private_data;
|
||||
};
|
||||
struct rcu_head rcu_head;
|
||||
};
|
||||
/* For tree user */
|
||||
struct list_head private_list;
|
||||
void __rcu *slots[RADIX_TREE_MAP_SIZE];
|
||||
unsigned long tags[RADIX_TREE_MAX_TAGS][RADIX_TREE_TAG_LONGS];
|
||||
};
|
||||
```
|
||||
|
||||
This structure contains information about the offset in a parent and height from the bottom, count of the child nodes and fields for accessing and freeing a node. This fields are described below:
|
||||
|
||||
* `path` - offset in parent & height from the bottom;
|
||||
* `count` - count of the child nodes;
|
||||
* `parent` - pointer to the parent node;
|
||||
* `private_data` - used by the user of a tree;
|
||||
* `rcu_head` - used for freeing a node;
|
||||
* `private_list` - used by the user of a tree;
|
||||
|
||||
The two last fields of the `radix_tree_node` - `tags` and `slots` are important and interesting. Every node can contains a set of slots which are store pointers to the data. Empty slots in the linux kernel radix tree implementation store `NULL`. Radix trees in the linux kernel also supports tags which are associated with the `tags` fields in the `radix_tree_node` structure. Tags allow individual bits to be set on records which are stored in the radix tree.
|
||||
|
||||
Now that we know about radix tree structure, it is time to look on its API.
|
||||
|
||||
Linux kernel radix tree API
|
||||
---------------------------------------------------------------------------------
|
||||
|
||||
We start from the datastructure initialization. There are two ways to initialize a new radix tree. The first is to use `RADIX_TREE` macro:
|
||||
|
||||
```C
|
||||
RADIX_TREE(name, gfp_mask);
|
||||
````
|
||||
|
||||
As you can see we pass the `name` parameter, so with the `RADIX_TREE` macro we can define and initialize radix tree with the given name. Implementation of the `RADIX_TREE` is easy:
|
||||
|
||||
```C
|
||||
#define RADIX_TREE(name, mask) \
|
||||
struct radix_tree_root name = RADIX_TREE_INIT(mask)
|
||||
|
||||
#define RADIX_TREE_INIT(mask) { \
|
||||
.height = 0, \
|
||||
.gfp_mask = (mask), \
|
||||
.rnode = NULL, \
|
||||
}
|
||||
```
|
||||
|
||||
At the beginning of the `RADIX_TREE` macro we define instance of the `radix_tree_root` structure with the given name and call `RADIX_TREE_INIT` macro with the given mask. The `RADIX_TREE_INIT` macro just initializes `radix_tree_root` structure with the default values and the given mask.
|
||||
|
||||
The second way is to define `radix_tree_root` structure by hand and pass it with mask to the `INIT_RADIX_TREE` macro:
|
||||
|
||||
```C
|
||||
struct radix_tree_root my_radix_tree;
|
||||
INIT_RADIX_TREE(my_tree, gfp_mask_for_my_radix_tree);
|
||||
```
|
||||
|
||||
where:
|
||||
|
||||
```C
|
||||
#define INIT_RADIX_TREE(root, mask) \
|
||||
do { \
|
||||
(root)->height = 0; \
|
||||
(root)->gfp_mask = (mask); \
|
||||
(root)->rnode = NULL; \
|
||||
} while (0)
|
||||
```
|
||||
|
||||
makes the same initialziation with default values as it does `RADIX_TREE_INIT` macro.
|
||||
|
||||
The next are two functions for inserting and deleting records to/from a radix tree:
|
||||
|
||||
* `radix_tree_insert`;
|
||||
* `radix_tree_delete`;
|
||||
|
||||
The first `radix_tree_insert` function takes three parameters:
|
||||
|
||||
* root of a radix tree;
|
||||
* index key;
|
||||
* data to insert;
|
||||
|
||||
The `radix_tree_delete` function takes the same set of parameters as the `radix_tree_insert`, but without data.
|
||||
|
||||
The search in a radix tree implemented in two ways:
|
||||
|
||||
* `radix_tree_lookup`;
|
||||
* `radix_tree_gang_lookup`;
|
||||
* `radix_tree_lookup_slot`.
|
||||
|
||||
The first `radix_tree_lookup` function takes two parameters:
|
||||
|
||||
* root of a radix tree;
|
||||
* index key;
|
||||
|
||||
This function tries to find the given key in the tree and return the record associated with this key. The second `radix_tree_gang_lookup` function have the following signature
|
||||
|
||||
```C
|
||||
unsigned int radix_tree_gang_lookup(struct radix_tree_root *root,
|
||||
void **results,
|
||||
unsigned long first_index,
|
||||
unsigned int max_items);
|
||||
```
|
||||
|
||||
and returns number of records, sorted by the keys, starting from the first index. Number of the returned records will not be greater than `max_items` value.
|
||||
|
||||
And the last `radix_tree_lookup_slot` function will return the slot which will contain the data.
|
||||
|
||||
Links
|
||||
---------------------------------------------------------------------------------
|
||||
|
||||
* [Radix tree](http://en.wikipedia.org/wiki/Radix_tree)
|
||||
* [Trie](http://en.wikipedia.org/wiki/Trie)
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://github.com/0xAX/linux-insides/edit/master/DataStructures/radix-tree.md
|
||||
|
||||
作者：[0xAX]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
|
||||
|
||||
@ -1,113 +0,0 @@
|
||||
How To Install Microsoft Visual Studio Code on Linux
|
||||
================================================================================
|
||||
Visual Studio code (VScode) is the cross-platform Chromium-based code editor is being open sourced today by Microsoft. How do I install Microsoft Visual Studio Code on a Debian or Ubuntu or Fedora Linux desktop?
|
||||
|
||||
Visual Studio supports debugging Linux apps and code editor now open source by Microsoft. It is a preview (beta) version but you can test it and use it on your own Linux based desktop.
|
||||
|
||||
### Why use Visual Studio Code? ###
|
||||
|
||||
From the project website:
|
||||
|
||||
> Visual Studio Code provides developers with a new choice of developer tool that combines the simplicity and streamlined experience of a code editor with the best of what developers need for their core code-edit-debug cycle. Visual Studio Code is the first code editor, and first cross-platform development tool - supporting OS X, Linux, and Windows - in the Visual Studio family. If you use Unity, ASP.NET 5, NODE.JS or related tool, give it a try.
|
||||
|
||||
### Requirements for Visual Studio Code on Linux ###
|
||||
|
||||
1. Ubuntu Desktop version 14.04
|
||||
1. GLIBCXX version 3.4.15 or later
|
||||
1. GLIBC version 2.15 or later
|
||||
|
||||
The following installation instructions are tested on:
|
||||
|
||||
1. Fedora Linux 22 and 23
|
||||
1. Debian Linux 8
|
||||
1. Ubuntu Linux 14.04 LTS
|
||||
|
||||
### Download Visual Studio Code ###
|
||||
|
||||
Visit [this page][1] to grab the latest version and save it to ~/Downloads/ folder on Linux desktop:
|
||||
|
||||
|
||||
|
||||
Fig.01: Download Visual Studio Code For Linux
|
||||
|
||||
Make a new folder (say $HOME/VSCode) and extract VSCode-linux-x64.zip inside that folder or in /usr/local/ folder. Unzip VSCode-linux64.zip to that folder.
|
||||
|
||||
Make a new folder (say $HOME/VSCode) and extract VSCode-linux-x64.zip inside that folder or in /usr/local/ folder. Unzip VSCode-linux64.zip to that folder.
|
||||
|
||||
### Alternate install method ###
|
||||
|
||||
You can use the wget command to download VScode as follows:
|
||||
|
||||
$ wget 'https://az764295.vo.msecnd.net/public/0.10.1-release/VSCode-linux64.zip'
|
||||
|
||||
Sample outputs:
|
||||
|
||||
--2015-11-18 13:55:23-- https://az764295.vo.msecnd.net/public/0.10.1-release/VSCode-linux64.zip
|
||||
Resolving az764295.vo.msecnd.net (az764295.vo.msecnd.net)... 93.184.215.200, 2606:2800:11f:179a:1972:2405:35b:459
|
||||
Connecting to az764295.vo.msecnd.net (az764295.vo.msecnd.net)|93.184.215.200|:443... connected.
|
||||
HTTP request sent, awaiting response... 200 OK
|
||||
Length: 64638315 (62M) [application/octet-stream]
|
||||
Saving to: 'VSCode-linux64.zip'
|
||||
|
||||
100%[======================================>] 64,638,315 84.9MB/s in 0.7s
|
||||
|
||||
2015-11-18 13:55:23 (84.9 MB/s) - 'VSCode-linux64.zip' saved [64638315/64638315]
|
||||
|
||||
### Install VScode using the command line ###
|
||||
|
||||
Cd to ~/Download/ location, enter:
|
||||
|
||||
$ cd ~/Download/
|
||||
$ ls -l
|
||||
|
||||
Sample outputs:
|
||||
|
||||
|
||||
|
||||
Fig.02: VSCode downloaded to my ~/Downloads/ folder
|
||||
|
||||
Unzip VSCode-linux64.zip in /usr/local/ directory, enter:
|
||||
|
||||
$ sudo unzip VSCode-linux64.zip -d /usr/local/
|
||||
|
||||
Cd into /usr/local/ to create the soft-link as follows using the ln command for the Code executable. This is useful to run VSCode from the terminal application:
|
||||
|
||||
$ su -
|
||||
# cd /usr/local/
|
||||
# ls -l
|
||||
# cd bin/
|
||||
# ln -s ../VSCode-linux-x64/Code code
|
||||
# exit
|
||||
|
||||
Sample session:
|
||||
|
||||
|
||||
|
||||
Fig.03 Create the sym-link with the absolute path to the Code executable
|
||||
|
||||
### How do I use VSCode on Linux? ###
|
||||
|
||||
Open the Terminal app and type the following command:
|
||||
|
||||
$ /usr/local/bin/code
|
||||
|
||||
Sample outputs:
|
||||
|
||||
|
||||
|
||||
Fig.04: VSCode in action on Linux
|
||||
|
||||
And, there you have it, the VSCode installed and working correctly on the latest version of Debian, Ubuntu and Fedora Linux. I suggest that you read [getting started pages from Microsoft][2] to understand the core concepts that will make you more productive writing and navigating your code.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/faq/debian-ubuntu-fedora-linux-installing-visual-studio-code/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:https://code.visualstudio.com/Download
|
||||
[2]:https://code.visualstudio.com/docs
|
||||
@ -1,70 +0,0 @@
|
||||
translation by strugglingyouth
|
||||
|
||||
How to Install NVIDIA 358.16 Driver in Ubuntu 15.10, 14.04
|
||||
================================================================================
|
||||
|
||||
|
||||
[NVIDIA 358.16][1], the first stable release in NVIDIA 358 series, has been announced with some fixes to 358.09 (Beta) and other small features.
|
||||
|
||||
NVIDIA 358 added a new **nvidia-modeset.ko** kernel module that works in conjunction with the nvidia.ko kernel module to program the display engine of the GPU. In a later driver release, the **nvidia-modeset.ko** kernel driver will be used as a basis for the mode-setting interface provided by the kernel’s direct rendering manager (DRM).
|
||||
|
||||
Thew new driver also has new GLX protocol extensions and a new system memory allocation mechanism for large allocations in the OpenGL driver. New GPUs **GeForce 805A** and **GeForce GTX 960A** are supported. NVIDIA 358.16 also supports X.Org Server 1.18 and OpenGL 4.3
|
||||
|
||||
### How to Install NVIDIA 358.16 in Ubuntu: ###
|
||||
|
||||
> Please don’t do it on production machines unless you know what you’re doing and how to undo it.
|
||||
|
||||
For the official binaries, please go to [nvidia.com/object/unix.html][1].
|
||||
|
||||
For those who prefer an Ubuntu PPA, I’d recommend the [Graphics Drivers PPA][2]. So far, Ubuntu 16.04, Ubuntu 15.10, Ubuntu 15.04, Ubuntu 14.04 are supported.
|
||||
|
||||
**1. Add PPA.**
|
||||
|
||||
Open terminal from Unity Dash, App Launcher, or via Ctrl+Alt+T shortcut key. When it opens, paste below command and hit enter:
|
||||
|
||||
sudo add-apt-repository ppa:graphics-drivers/ppa
|
||||
|
||||
|
||||
|
||||
Type your password when it asks. No visual feedback, just type in mind and hit Enter to continue.
|
||||
|
||||
**2. Refresh and install new driver.**
|
||||
|
||||
After adding PPA, run below commands one by one to refresh repository cache and install new driver packages:
|
||||
|
||||
sudo apt-get update
|
||||
|
||||
sudo apt-get install nvidia-358 nvidia-settings
|
||||
|
||||
### (Optional) Uninstall: ###
|
||||
|
||||
Boot into the recovery mode from the grub menu, and drop into root console. Then run below commands one by one:
|
||||
|
||||
Remount the file system as writable:
|
||||
|
||||
mount -o remount,rw /
|
||||
|
||||
Remove all nvidia packages:
|
||||
|
||||
apt-get purge nvidia*
|
||||
|
||||
Finally back to menu and reboot:
|
||||
|
||||
reboot
|
||||
|
||||
To disable/remove the graphics driver PPA, launch **Software & Updates** and navigate to **Other Software** tab.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://ubuntuhandbook.org/index.php/2015/11/install-nvidia-358-16-driver-ubuntu-15-10/
|
||||
|
||||
作者：[Ji m][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://ubuntuhandbook.org/index.php/about/
|
||||
[1]:http://www.nvidia.com/Download/driverResults.aspx/95921/en-us
|
||||
[2]:http://www.nvidia.com/object/unix.html
|
||||
[3]:https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa
|
||||
@ -1,97 +0,0 @@
|
||||
How to access Dropbox from the command line in Linux
|
||||
================================================================================
|
||||
Cloud storage is everywhere in today's multi-device environment, where people want to access content across multiple devices wherever they go. Dropbox is the most widely used cloud storage service thanks to its elegant UI and flawless multi-platform compatibility. The popularity of Dropbox has led to a flurry of official or unofficial Dropbox clients that are available across different operating system platforms.
|
||||
|
||||
Linux has its own share of Dropbox clients: CLI clients as well as GUI-based clients. [Dropbox Uploader][1] is an easy-to-use Dropbox CLI client written in BASH scripting language. In this tutorial, I describe** how to access Dropbox from the command line in Linux by using Dropbox Uploader**.
|
||||
|
||||
### Install and Configure Dropbox Uploader on Linux ###
|
||||
|
||||
To use Dropbox Uploader, download the script and make it executable.
|
||||
|
||||
$ wget https://raw.github.com/andreafabrizi/Dropbox-Uploader/master/dropbox_uploader.sh
|
||||
$ chmod +x dropbox_uploader.sh
|
||||
|
||||
Make sure that you have installed curl on your system, since Dropbox Uploader runs Dropbox APIs via curl.
|
||||
|
||||
To configure Dropbox Uploader, simply run dropbox_uploader.sh. When you run the script for the first time, it will ask you to grant the script access to your Dropbox account.
|
||||
|
||||
$ ./dropbox_uploader.sh
|
||||
|
||||
|
||||
|
||||
As instructed above, go to [https://www.dropbox.com/developers/apps][2] on your web browser, and create a new Dropbox app. Fill in the information of the new app as shown below, and enter the app name as generated by Dropbox Uploader.
|
||||
|
||||
|
||||
|
||||
After you have created a new app, you will see app key/secret on the next page. Make a note of them.
|
||||
|
||||
|
||||
|
||||
Enter the app key and secret in the terminal window where dropbox_uploader.sh is running. dropbox_uploader.sh will then generate an oAUTH URL (e.g., https://www.dropbox.com/1/oauth/authorize?oauth_token=XXXXXXXXXXXX).
|
||||
|
||||
|
||||
|
||||
Go to the oAUTH URL generated above on your web browser, and allow access to your Dropbox account.
|
||||
|
||||
|
||||
|
||||
This completes Dropbox Uploader configuration. To check whether Dropbox Uploader is successfully authenticated, run the following command.
|
||||
|
||||
$ ./dropbox_uploader.sh info
|
||||
|
||||
----------
|
||||
|
||||
Dropbox Uploader v0.12
|
||||
|
||||
> Getting info...
|
||||
|
||||
Name: Dan Nanni
|
||||
UID: XXXXXXXXXX
|
||||
Email: my@email_address
|
||||
Quota: 2048 Mb
|
||||
Used: 13 Mb
|
||||
Free: 2034 Mb
|
||||
|
||||
### Dropbox Uploader Examples ###
|
||||
|
||||
To list all contents in the top-level directory:
|
||||
|
||||
$ ./dropbox_uploader.sh list
|
||||
|
||||
To list all contents in a specific folder:
|
||||
|
||||
$ ./dropbox_uploader.sh list Documents/manuals
|
||||
|
||||
To upload a local file to a remote Dropbox folder:
|
||||
|
||||
$ ./dropbox_uploader.sh upload snort.pdf Documents/manuals
|
||||
|
||||
To download a remote file from Dropbox to a local file:
|
||||
|
||||
$ ./dropbox_uploader.sh download Documents/manuals/mysql.pdf ./mysql.pdf
|
||||
|
||||
To download an entire remote folder from Dropbox to a local folder:
|
||||
|
||||
$ ./dropbox_uploader.sh download Documents/manuals ./manuals
|
||||
|
||||
To create a new remote folder on Dropbox:
|
||||
|
||||
$ ./dropbox_uploader.sh mkdir Documents/whitepapers
|
||||
|
||||
To delete an entire remote folder (including all its contents) on Dropbox:
|
||||
|
||||
$ ./dropbox_uploader.sh delete Documents/manuals
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://xmodulo.com/access-dropbox-command-line-linux.html
|
||||
|
||||
作者：[Dan Nanni][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://xmodulo.com/author/nanni
|
||||
[1]:http://www.andreafabrizi.it/?dropbox_uploader
|
||||
[2]:https://www.dropbox.com/developers/apps
|
||||
@ -1,139 +0,0 @@
|
||||
How to install Android Studio on Ubuntu 15.04 / CentOS 7
|
||||
================================================================================
|
||||
With the advancement of smart phones in the recent years, Android has become one of the biggest phone platforms and all the tools required to build Android applications are also freely available. Android Studio is an Integrated Development Environment (IDE) for developing Android applications based on [IntelliJ IDEA][1]. It is a free and open source software by Google released in 2014 and succeeds Eclipse as the main IDE.
|
||||
|
||||
In this article, we will learn how to install Android Studio on Ubuntu 15.04 and CentOS 7.
|
||||
|
||||
### Installation on Ubuntu 15.04 ###
|
||||
|
||||
We can install Android Studio in two ways. One is to set up the required repository and install it; other is to download it from the official Android site and install it locally. In the following example, we will be setting up the repo using command line and install it. Before proceeding, we need to make sure that we have JDK version1.6 or greater installed.
|
||||
|
||||
Here, I'm installing JDK 1.8.
|
||||
|
||||
$ sudo add-apt-repository ppa:webupd8team/java
|
||||
|
||||
$ sudo apt-get update
|
||||
|
||||
$ sudo apt-get install oracle-java8-installer oracle-java8-set-default
|
||||
|
||||
Verify if java installation was successful:
|
||||
|
||||
poornima@poornima-Lenovo:~$ java -version
|
||||
|
||||
Now, setup the repo for installing Android Studio
|
||||
|
||||
$ sudo apt-add-repository ppa:paolorotolo/android-studio
|
||||
|
||||
|
||||
|
||||
$ sudo apt-get update
|
||||
|
||||
$ sudo apt-get install android-studio
|
||||
|
||||
Above install command will install android-studio in the directory /opt.
|
||||
|
||||
Now, run the following command to start the setup wizard:
|
||||
|
||||
$ /opt/android-studio/bin/studio.sh
|
||||
|
||||
This will invoke the setup screen. Following are the screen shots that follow to set up Android studio:
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
Once you press the Finish button, Licence agreement will be displayed. After you accept the licence, it starts downloading the required components.
|
||||
|
||||
|
||||
|
||||
Android studio installation will be complete after this step. When you relaunch Android studio, you will be shown the following welcome screen from where you will be able to start working with your Android Studio.
|
||||
|
||||
|
||||
|
||||
### Installation on CentOS 7 ###
|
||||
|
||||
Let us now learn how to install Android Studio on CentOS 7. Here also, you need to install JDK 1.6 or later. Remember to use 'sudo' before the commands if you are not a root user. You can download the [latest version][2] of JDK. In case you already have an older version installed, remove the same before installing the new one. In the below example, I will be installing JDK version 1.8.0_65 by downloading the required rpm.
|
||||
|
||||
[root@li1260-39 ~]# rpm -ivh jdk-8u65-linux-x64.rpm
|
||||
Preparing... ################################# [100%]
|
||||
Updating / installing...
|
||||
1:jdk1.8.0_65-2000:1.8.0_65-fcs ################################# [100%]
|
||||
Unpacking JAR files...
|
||||
tools.jar...
|
||||
plugin.jar...
|
||||
javaws.jar...
|
||||
deploy.jar...
|
||||
rt.jar...
|
||||
jsse.jar...
|
||||
charsets.jar...
|
||||
localedata.jar...
|
||||
jfxrt.jar...
|
||||
|
||||
If Java path is not set properly, you will get error messages. Hence, set the correct path:
|
||||
|
||||
export JAVA_HOME=/usr/java/jdk1.8.0_25/
|
||||
export PATH=$PATH:$JAVA_HOME
|
||||
|
||||
Check if the correct version has been installed:
|
||||
|
||||
[root@li1260-39 ~]# java -version
|
||||
java version "1.8.0_65"
|
||||
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
|
||||
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)
|
||||
|
||||
If you notice any error message of the sort "unable-to-run-mksdcard-sdk-tool:" while trying to install Android Studio, you might also have to install the following packages on CentOS 7 64-bit:
|
||||
|
||||
glibc.i686
|
||||
|
||||
glibc-devel.i686
|
||||
|
||||
libstdc++.i686
|
||||
|
||||
zlib-devel.i686
|
||||
|
||||
ncurses-devel.i686
|
||||
|
||||
libX11-devel.i686
|
||||
|
||||
libXrender.i686
|
||||
|
||||
libXrandr.i686
|
||||
|
||||
Let us know install studio by downloading the ide file from [Android site][3] and unzipping the same.
|
||||
|
||||
[root@li1260-39 tmp]# unzip android-studio-ide-141.2343393-linux.zip
|
||||
|
||||
Move android-studio directory to /opt directory
|
||||
|
||||
[root@li1260-39 tmp]# mv /tmp/android-studio/ /opt/
|
||||
|
||||
You can create a simlink to the studio executable to quickly start it whenever you need it.
|
||||
|
||||
[root@li1260-39 tmp]# ln -s /opt/android-studio/bin/studio.sh /usr/local/bin/android-studio
|
||||
|
||||
Now launch the studio from a terminal:
|
||||
|
||||
[root@localhost ~]#studio
|
||||
|
||||
The screens that follow for completing the installation are same as the ones shown above for Ubuntu. When the installation completes, you can start creating your own Android applications.
|
||||
|
||||
### Conclusion ###
|
||||
|
||||
Within a year of its release, Android Studio has taken over as the primary IDE for Android development by eclipsing Eclipse. It is the only official IDE tool that will support future Android SDKs and other Android features that will be provided by Google. So, what are you waiting for? Go install Android Studio and have fun developing Android apps.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://linoxide.com/tools/install-android-studio-ubuntu-15-04-centos-7/
|
||||
|
||||
作者：[B N Poornima][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/bnpoornima/
|
||||
[1]:https://www.jetbrains.com/idea/
|
||||
[2]:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
|
||||
[3]:http://developer.android.com/sdk/index.html
|
||||
@ -1,46 +0,0 @@
|
||||
Install Intel Graphics Installer in Ubuntu 15.10
|
||||
================================================================================
|
||||
|
||||
|
||||
Intel has announced a new release of its Linux graphics installer recently. Ubuntu 15.10 Wily is required and support for Ubuntu 15.04 is deprecated in the new release.
|
||||
|
||||
> The Intel® Graphics Installer for Linux* allows you to easily install the latest graphics and video drivers for your Intel graphics hardware. This allows you to stay current with the latest enhancements, optimizations, and fixes to the Intel® Graphics Stack to ensure the best user experience with your Intel® graphics hardware. The Intel® Graphics Installer for Linux* is available for the latest version of Ubuntu*.
|
||||
|
||||
|
||||
|
||||
### How to Install: ###
|
||||
|
||||
**1.** Download the installer from [the link page][1]. The current is version 1.2.1 for Ubuntu 15.10. Check your OS type, 32-bit or 64-bit, via **System Settings -> Details**.
|
||||
|
||||
|
||||
|
||||
**2.** Once the download process finished, go to your Download folder and click open the .deb package with Ubuntu Software Center and finally click the install button.
|
||||
|
||||
|
||||
|
||||
**3.** In order to trust the Intel Graphics Installer, you will need to add keys via below commands.
|
||||
|
||||
Open terminal from Unity Dash, App Launcher, or via Ctrl+Alt+T shortcut key. When it opens, paste below commands and run one by one:
|
||||
|
||||
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg -O - | sudo apt-key add -
|
||||
|
||||
wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-2 -O - | sudo apt-key add -
|
||||
|
||||
|
||||
|
||||
NOTE: While running the first command, if the cursor is stuck and blinking after downloading the key, as above picture shows, type your password (no visual feedback) and hit enter to continue.
|
||||
|
||||
Finally launch Intel Graphics Installer via Unity Dash or Application launcher.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://ubuntuhandbook.org/index.php/2015/11/install-intel-graphics-installer-in-ubuntu-15-10/
|
||||
|
||||
作者：[Ji m][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://ubuntuhandbook.org/index.php/about/
|
||||
[1]:https://01.org/linuxgraphics/downloads
|
||||
@ -1,83 +0,0 @@
|
||||
LNAV – Ncurses based log file viewer
|
||||
================================================================================
|
||||
The Logfile Navigator, lnav for short, is a curses-based tool for viewing and analyzing log files. The value added by lnav over text viewers / editors is that it takes advantage of any semantic information that can be gleaned from the log file, such as timestamps and log levels. Using this extra semantic information, lnav can do things like: interleaving messages from different files; generate histograms of messages over time; and providing hotkeys for navigating through the file. It is hoped that these features will allow the user to quickly and efficiently zero-in on problems.
|
||||
|
||||
### lnav Features ###
|
||||
|
||||
#### Support for the following log file formats: ####
|
||||
|
||||
Syslog, Apache access log, strace, tcsh history, and generic log files with timestamps. The file format is automatically detected when the file is read in.
|
||||
|
||||
#### Histogram view: ####
|
||||
|
||||
Displays the number of log messages per bucket-of-time. Useful for getting an overview of what was happening over a long period of time.
|
||||
|
||||
#### Filters: ####
|
||||
|
||||
Display only lines that match or do not match a set of regular expressions. Useful for removing extraneous log lines that you are not interested in.
|
||||
|
||||
#### "Live" operation: ####
|
||||
|
||||
Searches are done as you type; new log lines are automatically loaded and searched as they are added; filters apply to lines as they are loaded; and, SQL queries are checked for correctness as you type.
|
||||
|
||||
#### Automatic tailing: ####
|
||||
|
||||
The log file view automatically scrolls down to follow new lines that are added to files. Simply scroll up to lock the view in place and then scroll down to the bottom to resume tailing.
|
||||
|
||||
#### Time-of-day ordering of lines: ####
|
||||
|
||||
The log lines from all the files are loaded and then sorted by time-of-day. Relieves you of having to manually line up log messages from different files.
|
||||
|
||||
#### Syntax highlighting: ####
|
||||
|
||||
Errors and warnings are colored in red and yellow, respectively. Highlights are also applied to: SQL keywords, XML tags, file and line numbers in Java backtraces, and quoted strings.
|
||||
|
||||
#### Navigation: ####
|
||||
|
||||
There are hotkeys for jumping to the next or previous error or warning and moving forward or backward by an amount of time.
|
||||
|
||||
#### Use SQL to query logs: ####
|
||||
|
||||
Each log file line is treated as a row in a database that can be queried using SQL. The columns that are available depend on logs file types being viewed.
|
||||
|
||||
#### Command and search history: ####
|
||||
|
||||
Your previously entered commands and searches are saved so you can access them between sessions.
|
||||
|
||||
#### Compressed files: ####
|
||||
|
||||
Compressed log files are automatically detected and uncompressed on the fly.
|
||||
|
||||
### Install lnav on ubuntu 15.10 ###
|
||||
|
||||
Open the terminal and run the following command
|
||||
|
||||
sudo apt-get install lnav
|
||||
|
||||
### Using lnav ###
|
||||
|
||||
If you want to view logs using lnav you can do using the following command by default it shows syslogs
|
||||
|
||||
lnav
|
||||
|
||||
|
||||
|
||||
If you want to view specific logs provide the path
|
||||
|
||||
If you want to view CUPS logs run the following command from your terminal
|
||||
|
||||
lnav /var/log/cups
|
||||
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.ubuntugeek.com/lnav-ncurses-based-log-file-viewer.html
|
||||
|
||||
作者：[ruchi][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.ubuntugeek.com/author/ubuntufix
|
||||
@ -0,0 +1,40 @@
|
||||
Running a mainline kernel on a cellphone
|
||||
================================================================================
|
||||
|
||||
One of the biggest freedoms associated with free software is the ability to replace a program with an updated or modified version. Even so, of the many millions of people using Linux-powered phones, few are able to run a mainline kernel on those phones, even if they have the technical skills to do the replacement. The sad fact is that no mainstream phone available runs mainline kernels. A session at the 2015 Kernel Summit, led by Rob Herring, explored this problem and what might be done to address it.
|
||||
|
||||
When asked, most of the developers in the room indicated that they would prefer to be able to run mainline kernels on their phones — though a handful did say that they would rather not do so. Rob has been working on this problem for the last year and a half in support of Project Ara (mentioned in this article). But the news is not good.
|
||||
|
||||
There is, he said, too much out-of-tree code running on a typical handset; mainline kernels simply lack the drivers needed to make that handset work. A typical phone is running 1-3 million lines of out-of-tree code. Almost all of those phones are stuck on the 3.10 kernel — or something even older. There are all kinds of reasons for this, but the simple fact is that things seem to move too quickly in the handset world for the kernel community to keep up. Is that, he asked, something that we care about?
|
||||
|
||||
Tim Bird noted that the Nexus 1, one of the original Android phones, never ran a mainline kernel and never will. It broke the promise of open source, making it impossible for users to put a new kernel onto their devices. At this point, no phone supports that ability. Peter Zijlstra wondered about how much of that out-of-tree code was duplicated functionality from one handset to the next; Rob noted that he has run into three independently developed hotplug governors so far.
|
||||
|
||||
Dirk Hohndel suggested that few people care. Of the billion phones out there, he said, approximately 27 of them have owners who care about running mainline kernels. The rest just want to get the phone to work. Perhaps developers who are concerned about running mainline kernels are trying to solve the wrong problem.
|
||||
|
||||
Chris Mason said that handset vendors are currently facing the same sorts of problems that distributors dealt with many years ago. They are coping with a lot of inefficient, repeated, duplicated work. Once the distributors [Rob Herring] decided to put their work into the mainline instead of carrying it themselves, things got a lot better. The key is to help the phone manufacturers to realize that they can benefit in the same way; that, rather than pressure from users, is how the problem will be solved.
|
||||
|
||||
Grant Likely raised concerns about security in a world where phones cannot be upgraded. What we need is a real distribution market for phones. But, as long as the vendors are in charge of the operating software, phones will not be upgradeable. We have a big security mess coming, he said. Peter added that, with Stagefright, that mess is already upon us.
|
||||
|
||||
Ted Ts'o said that running mainline kernels is not his biggest concern. He would be happy if the phones on sale this holiday season would be running a 3.18 or 4.1 kernel, rather than being stuck on 3.10. That, he suggested, is a more solvable problem. Steve Rostedt said that would not solve the security problem, but Ted remarked that a newer kernel would at least make it easier to backport fixes. Grant replied that, one year from now, it would all just happen again; shipping newer kernels is just an incremental fix. Kees Cook added that there is not much to be gained from backporting fixes; the real problem is that there are no defenses from bugs (he would expand on this theme in a separate session later in the day).
|
||||
|
||||
Rob said that any kind of solution would require getting the vendors on board. That, though, will likely run into trouble with the sort of lockdown that vendors like to apply to their devices. Paolo Bonzini asked whether it would be possible to sue vendors over unfixed security vulnerabilities, especially when the devices are still under warranty. Grant said that upgradeability had to become a market requirement or it simply wasn't going to happen. It might be a nasty security issue that causes this to happen, or carriers might start requiring it. Meanwhile, kernel developers need to keep pushing in that direction. Rob noted that, beyond the advantages noted thus far, the ability to run mainline kernels would help developers to test and validate new features on Android devices.
|
||||
|
||||
Josh Triplett asked whether the community would be prepared to do what it would take if the industry were to come around to the idea of mainline kernel support. There would be lots of testing and validation of kernels on handsets required; Android Compatibility Test Suite failures would have to be treated as regressions. Rob suggested that this could be discussed next year, after the basic functionality is in place, but Josh insisted that, if the demand were to show up, we would have to be able to give a good answer.
|
||||
|
||||
Tim said that there is currently a big disconnect with the vendor world; vendors are not reporting or contributing anything back to the community at all. They are completely disconnected, so there is no forward progress ever. Josh noted that when vendors do report bugs with the old kernels they are using, the reception tends to be less than friendly. Arnd Bergmann said that what was needed was to get one of the big silicon vendors to commit to the idea and get its hardware to a point where running mainline kernels was possible; that would put pressure on the others. But, he added, that would require the existence of one free GPU driver that got shipped with the hardware — something that does not exist currently.
|
||||
|
||||
Rob put up a list of problem areas, but there was not much time for discussion of the particulars. WiFi drivers continue to be an issue, especially with the new features being added in the Android world. Johannes Berg agreed that the new features are an issue; the Android developers do not even talk about them until they ship with the hardware. Support for most of those features does eventually land in the mainline kernel, though.
|
||||
|
||||
As things wound down, Ben Herrenschmidt reiterated that the key was to get vendors to realize that working with the mainline kernel is in their own best interest; it saves work in the long run. Mark Brown said that, in past years when the kernel version shipped with Android moved forward more reliably, the benefits of working upstream were more apparent to vendors. Now that things seem to be stuck on 3.10, that pressure is not there in the same way. The session ended with developers determined to improve the situation, but without any clear plan for getting there.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://lwn.net/Articles/662147/
|
||||
|
||||
作者：[Jonathan Corbet][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:https://lwn.net/Articles/KernelSummit2015/
|
||||
@ -0,0 +1,425 @@
|
||||
15 Useful Linux and Unix Tape Managements Commands For Sysadmins
|
||||
================================================================================
|
||||
Tape devices should be used on a regular basis only for archiving files or for transferring data from one server to another. Usually, tape devices are all hooked up to Unix boxes, and controlled with mt or mtx. You must backup all data to both disks (may be in cloud) and tape device. In this tutorial you will learn about:
|
||||
|
||||
- Tape device names
|
||||
- Basic commands to manage tape drive
|
||||
- Basic backup and restore commands
|
||||
|
||||
### Why backup? ###
|
||||
|
||||
A backup plant is important:
|
||||
|
||||
- Ability to recover from disk failure
|
||||
- Accidental file deletion
|
||||
- File or file system corruption
|
||||
- Complete server destruction, including destruction of on-site backups due to fire or other problems.
|
||||
|
||||
You can use tape based archives to backup the whole server and move tapes off-site.
|
||||
|
||||
### Understanding tape file marks and block size ###
|
||||
|
||||
|
||||
|
||||
Fig.01: Tape file marks
|
||||
|
||||
Each tape device can store multiple tape backup files. Tape backup files are created using cpio, tar, dd, and so on. However, tape device can be opened, written data to, and closed by various program. You can store several backups (tapes) on physical tape. Between each tape file is a "tape file mark". This is used to indicate where one tape file ends and another begins on physical tape. You need to use mt command to positions the tape (winds forward and rewinds and marks).
|
||||
|
||||
#### How data is stored on a tape ####
|
||||
|
||||
|
||||
|
||||
Fig.02: How data is stored on a tape
|
||||
|
||||
All data is stored subsequently in sequential tape archive format using tar. The first tape archive will start on the physical beginning of the tape (tar #0). The next will be tar #1 and so on.
|
||||
|
||||
### Tape device names on Unix ###
|
||||
|
||||
1. /dev/rmt/0 or /dev/rmt/1 or /dev/rmt/[0-127] : Regular tape device name on Unix. The tape is rewound.
|
||||
1. /dev/rmt/0n : This is know as no rewind i.e. after using tape, leaves the tape in current status for next command.
|
||||
1. /dev/rmt/0b : Use magtape interface i.e. BSD behavior. More-readable by a variety of OS's such as AIX, Windows, Linux, FreeBSD, and more.
|
||||
1. /dev/rmt/0l : Set density to low.
|
||||
1. /dev/rmt/0m : Set density to medium.
|
||||
1. /dev/rmt/0u : Set density to high.
|
||||
1. /dev/rmt/0c : Set density to compressed.
|
||||
1. /dev/st[0-9] : Linux specific SCSI tape device name.
|
||||
1. /dev/sa[0-9] : FreeBSD specific SCSI tape device name.
|
||||
1. /dev/esa0 : FreeBSD specific SCSI tape device name that eject on close (if capable).
|
||||
|
||||
#### Tape device name examples ####
|
||||
|
||||
- The /dev/rmt/1cn indicate that I'm using unity 1, compressed density and no rewind.
|
||||
- The /dev/rmt/0hb indicate that I'm using unity 0, high density and BSD behavior.
|
||||
- The auto rewind SCSI tape device name on Linux : /dev/st0
|
||||
- The non-rewind SCSI tape device name on Linux : /dev/nst0
|
||||
- The auto rewind SCSI tape device name on FreeBSD: /dev/sa0
|
||||
- The non-rewind SCSI tape device name on FreeBSD: /dev/nsa0
|
||||
|
||||
#### How do I list installed scsi tape devices? ####
|
||||
|
||||
Type the following commands:
|
||||
|
||||
## Linux (read man pages for more info) ##
|
||||
lsscsi
|
||||
lsscsi -g
|
||||
|
||||
## IBM AIX ##
|
||||
lsdev -Cc tape
|
||||
lsdev -Cc adsm
|
||||
lscfg -vl rmt*
|
||||
|
||||
## Solaris Unix ##
|
||||
cfgadm –a
|
||||
cfgadm -al
|
||||
luxadm probe
|
||||
iostat -En
|
||||
|
||||
## HP-UX Unix ##
|
||||
ioscan Cf
|
||||
ioscan -funC tape
|
||||
ioscan -fnC tape
|
||||
ioscan -kfC tape
|
||||
|
||||
|
||||
Sample outputs from my Linux server:
|
||||
|
||||
|
||||
|
||||
Fig.03: Installed tape devices on Linux server
|
||||
|
||||
### mt command examples ###
|
||||
|
||||
In Linux and Unix-like system, mt command is used to control operations of the tape drive, such as finding status or seeking through files on a tape or writing tape control marks to the tape. You must most of the following command as root user. The syntax is:
|
||||
|
||||
mt -f /tape/device/name operation
|
||||
|
||||
#### Setting up environment ####
|
||||
|
||||
You can set TAPE shell variable. This is the pathname of the tape drive. The default (if the variable is unset, but not if it is null) is /dev/nsa0 on FreeBSD. It may be overridden with the -f option passed to the mt command as explained below.
|
||||
|
||||
## Add to your shell startup file ##
|
||||
TAPE=/dev/st1 #Linux
|
||||
TAPE=/dev/rmt/2 #Unix
|
||||
TAPE=/dev/nsa3 #FreeBSD
|
||||
export TAPE
|
||||
|
||||
### 1: Display status of the tape/drive ###
|
||||
|
||||
mt status #Use default
|
||||
mt -f /dev/rmt/0 status #Unix
|
||||
mt -f /dev/st0 status #Linux
|
||||
mt -f /dev/nsa0 status #FreeBSD
|
||||
mt -f /dev/rmt/1 status #Unix unity 1 i.e. tape device no. 1
|
||||
|
||||
You can use shell loop as follows to poll a system and locate all of its tape drives:
|
||||
|
||||
for d in 0 1 2 3 4 5
|
||||
do
|
||||
mt -f "/dev/rmt/${d}" status
|
||||
done
|
||||
|
||||
### 2: Rewinds the tape ###
|
||||
|
||||
mt rew
|
||||
mt rewind
|
||||
mt -f /dev/mt/0 rewind
|
||||
mt -f /dev/st0 rewind
|
||||
|
||||
### 3: Eject the tape ###
|
||||
|
||||
mt off
|
||||
mt offline
|
||||
mt eject
|
||||
mt -f /dev/mt/0 off
|
||||
mt -f /dev/st0 eject
|
||||
|
||||
### 4: Erase the tape (rewind the tape and, if applicable, unload the tape) ###
|
||||
|
||||
mt erase
|
||||
mt -f /dev/st0 erase #Linux
|
||||
mt -f /dev/rmt/0 erase #Unix
|
||||
|
||||
### 5: Retensioning a magnetic tape cartridge ###
|
||||
|
||||
If errors occur when a tape is being read, you can retension the tape, clean the tape drive, and then try again as follows:
|
||||
|
||||
mt retension
|
||||
mt -f /dev/rmt/1 retension #Unix
|
||||
mt -f /dev/st0 retension #Linux
|
||||
|
||||
### 6: Writes n EOF marks in the current position of tape ###
|
||||
|
||||
mt eof
|
||||
mt weof
|
||||
mt -f /dev/st0 eof
|
||||
|
||||
### 7: Forward space count files i.e. jumps n EOF marks ###
|
||||
|
||||
The tape is positioned on the first block of the next file i.e. tape will position on first block of the field (see fig.01):
|
||||
|
||||
mt fsf
|
||||
mt -f /dev/rmt/0 fsf
|
||||
mt -f /dev/rmt/1 fsf 1 #go 1 forward file/tape (see fig.01)
|
||||
|
||||
### 8: Backward space count files i.e. rewinds n EOF marks ###
|
||||
|
||||
The tape is positioned on the first block of the next file i.e. tape positions after EOF mark (see fig.01):
|
||||
|
||||
mt bsf
|
||||
mt -f /dev/rmt/1 bsf
|
||||
mt -f /dev/rmt/1 bsf 1 #go 1 backward file/tape (see fig.01)
|
||||
|
||||
Here is a list of the tape position commands:
|
||||
|
||||
fsf Forward space count files. The tape is positioned on the first block of the next file.
|
||||
|
||||
fsfm Forward space count files. The tape is positioned on the last block of the previous file.
|
||||
|
||||
bsf Backward space count files. The tape is positioned on the last block of the previous file.
|
||||
|
||||
bsfm Backward space count files. The tape is positioned on the first block of the next file.
|
||||
|
||||
asf The tape is positioned at the beginning of the count file. Positioning is done by first rewinding the tape and then spacing forward over count filemarks.
|
||||
|
||||
fsr Forward space count records.
|
||||
|
||||
bsr Backward space count records.
|
||||
|
||||
fss (SCSI tapes) Forward space count setmarks.
|
||||
|
||||
bss (SCSI tapes) Backward space count setmarks.
|
||||
|
||||
### Basic backup commands ###
|
||||
|
||||
Let us see commands to backup and restore files
|
||||
|
||||
### 9: To backup directory (tar format) ###
|
||||
|
||||
tar cvf /dev/rmt/0n /etc
|
||||
tar cvf /dev/st0 /etc
|
||||
|
||||
### 10: To restore directory (tar format) ###
|
||||
|
||||
tar xvf /dev/rmt/0n -C /path/to/restore
|
||||
tar xvf /dev/st0 -C /tmp
|
||||
|
||||
### 11: List or check tape contents (tar format) ###
|
||||
|
||||
mt -f /dev/st0 rewind; dd if=/dev/st0 of=-
|
||||
|
||||
## tar format ##
|
||||
tar tvf {DEVICE} {Directory-FileName}
|
||||
tar tvf /dev/st0
|
||||
tar tvf /dev/st0 desktop
|
||||
tar tvf /dev/rmt/0 foo > list.txt
|
||||
|
||||
### 12: Backup partition with dump or ufsdump ###
|
||||
|
||||
## Unix backup c0t0d0s2 partition ##
|
||||
ufsdump 0uf /dev/rmt/0 /dev/rdsk/c0t0d0s2
|
||||
|
||||
## Linux backup /home partition ##
|
||||
dump 0uf /dev/nst0 /dev/sda5
|
||||
dump 0uf /dev/nst0 /home
|
||||
|
||||
## FreeBSD backup /usr partition ##
|
||||
dump -0aL -b64 -f /dev/nsa0 /usr
|
||||
|
||||
### 12: Restore partition with ufsrestore or restore ###
|
||||
|
||||
## Unix ##
|
||||
ufsrestore xf /dev/rmt/0
|
||||
## Unix interactive restore ##
|
||||
ufsrestore if /dev/rmt/0
|
||||
|
||||
## Linux ##
|
||||
restore rf /dev/nst0
|
||||
## Restore interactive from the 6th backup on the tape media ##
|
||||
restore isf 6 /dev/nst0
|
||||
|
||||
## FreeBSD restore ufsdump format ##
|
||||
restore -i -f /dev/nsa0
|
||||
|
||||
### 13: Start writing at the beginning of the tape (see fig.02) ###
|
||||
|
||||
## This will overwrite all data on tape ##
|
||||
mt -f /dev/st1 rewind
|
||||
|
||||
### Backup home ##
|
||||
tar cvf /dev/st1 /home
|
||||
|
||||
## Offline and unload tape ##
|
||||
mt -f /dev/st0 offline
|
||||
|
||||
To restore from the beginning of the tape:
|
||||
|
||||
mt -f /dev/st0 rewind
|
||||
tar xvf /dev/st0
|
||||
mt -f /dev/st0 offline
|
||||
|
||||
### 14: Start writing after the last tar (see fig.02) ###
|
||||
|
||||
## This will kee all data written so far ##
|
||||
mt -f /dev/st1 eom
|
||||
|
||||
### Backup home ##
|
||||
tar cvf /dev/st1 /home
|
||||
|
||||
## Unload ##
|
||||
mt -f /dev/st0 offline
|
||||
|
||||
### 15: Start writing after tar number 2 (see fig.02) ###
|
||||
|
||||
## To wrtite after tar number 2 (should be 2+1)
|
||||
mt -f /dev/st0 asf 3
|
||||
tar cvf /dev/st0 /usr
|
||||
|
||||
## asf equivalent command done using fsf ##
|
||||
mt -f /dev/sf0 rewind
|
||||
mt -f /dev/st0 fsf 2
|
||||
|
||||
To restore tar from tar number 2:
|
||||
|
||||
mt -f /dev/st0 asf 3
|
||||
tar xvf /dev/st0
|
||||
mt -f /dev/st0 offline
|
||||
|
||||
### How do I verify backup tapes created using tar? ###
|
||||
|
||||
It is important that you do regular full system restorations and service testing, it's the only way to know for sure that the entire system is working correctly. See our [tutorial on verifying tar command tape backups][1] for more information.
|
||||
|
||||
### Sample shell script ###
|
||||
|
||||
#!/bin/bash
|
||||
# A UNIX / Linux shell script to backup dirs to tape device like /dev/st0 (linux)
|
||||
# This script make both full and incremental backups.
|
||||
# You need at two sets of five tapes. Label each tape as Mon, Tue, Wed, Thu and Fri.
|
||||
# You can run script at midnight or early morning each day using cronjons.
|
||||
# The operator or sys admin can replace the tape every day after the script has done.
|
||||
# Script must run as root or configure permission via sudo.
|
||||
# -------------------------------------------------------------------------
|
||||
# Copyright (c) 1999 Vivek Gite <vivek@nixcraft.com>
|
||||
# This script is licensed under GNU GPL version 2.0 or above
|
||||
# -------------------------------------------------------------------------
|
||||
# This script is part of nixCraft shell script collection (NSSC)
|
||||
# Visit http://bash.cyberciti.biz/ for more information.
|
||||
# -------------------------------------------------------------------------
|
||||
# Last updated on : March-2003 - Added log file support.
|
||||
# Last updated on : Feb-2007 - Added support for excluding files / dirs.
|
||||
# -------------------------------------------------------------------------
|
||||
LOGBASE=/root/backup/log
|
||||
|
||||
# Backup dirs; do not prefix /
|
||||
BACKUP_ROOT_DIR="home sales"
|
||||
|
||||
# Get todays day like Mon, Tue and so on
|
||||
NOW=$(date +"%a")
|
||||
|
||||
# Tape devie name
|
||||
TAPE="/dev/st0"
|
||||
|
||||
# Exclude file
|
||||
TAR_ARGS=""
|
||||
EXCLUDE_CONF=/root/.backup.exclude.conf
|
||||
|
||||
# Backup Log file
|
||||
LOGFIILE=$LOGBASE/$NOW.backup.log
|
||||
|
||||
# Path to binaries
|
||||
TAR=/bin/tar
|
||||
MT=/bin/mt
|
||||
MKDIR=/bin/mkdir
|
||||
|
||||
# ------------------------------------------------------------------------
|
||||
# Excluding files when using tar
|
||||
# Create a file called $EXCLUDE_CONF using a text editor
|
||||
# Add files matching patterns such as follows (regex allowed):
|
||||
# home/vivek/iso
|
||||
# home/vivek/*.cpp~
|
||||
# ------------------------------------------------------------------------
|
||||
[ -f $EXCLUDE_CONF ] && TAR_ARGS="-X $EXCLUDE_CONF"
|
||||
|
||||
#### Custom functions #####
|
||||
# Make a full backup
|
||||
full_backup(){
|
||||
local old=$(pwd)
|
||||
cd /
|
||||
$TAR $TAR_ARGS -cvpf $TAPE $BACKUP_ROOT_DIR
|
||||
$MT -f $TAPE rewind
|
||||
$MT -f $TAPE offline
|
||||
cd $old
|
||||
}
|
||||
|
||||
# Make a partial backup
|
||||
partial_backup(){
|
||||
local old=$(pwd)
|
||||
cd /
|
||||
$TAR $TAR_ARGS -cvpf $TAPE -N "$(date -d '1 day ago')" $BACKUP_ROOT_DIR
|
||||
$MT -f $TAPE rewind
|
||||
$MT -f $TAPE offline
|
||||
cd $old
|
||||
}
|
||||
|
||||
# Make sure all dirs exits
|
||||
verify_backup_dirs(){
|
||||
local s=0
|
||||
for d in $BACKUP_ROOT_DIR
|
||||
do
|
||||
if [ ! -d /$d ];
|
||||
then
|
||||
echo "Error : /$d directory does not exits!"
|
||||
s=1
|
||||
fi
|
||||
done
|
||||
# if not; just die
|
||||
[ $s -eq 1 ] && exit 1
|
||||
}
|
||||
|
||||
#### Main logic ####
|
||||
|
||||
# Make sure log dir exits
|
||||
[ ! -d $LOGBASE ] && $MKDIR -p $LOGBASE
|
||||
|
||||
# Verify dirs
|
||||
verify_backup_dirs
|
||||
|
||||
# Okay let us start backup procedure
|
||||
# If it is Monday make a full backup;
|
||||
# For Tue to Fri make a partial backup
|
||||
# Weekend no backups
|
||||
case $NOW in
|
||||
Mon) full_backup;;
|
||||
Tue|Wed|Thu|Fri) partial_backup;;
|
||||
*) ;;
|
||||
esac > $LOGFIILE 2>&1
|
||||
|
||||
### A note about third party backup utilities ###
|
||||
|
||||
Both Linux and Unix-like system provides many third-party utilities which you can use to schedule the creation of backups including tape backups such as:
|
||||
|
||||
- Amanda
|
||||
- Bacula
|
||||
- rsync
|
||||
- duplicity
|
||||
- rsnapshot
|
||||
|
||||
See also
|
||||
|
||||
- Man pages - [mt(1)][2], [mtx(1)][3], [tar(1)][4], [dump(8)][5], [restore(8)][6]
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/hardware/unix-linux-basic-tape-management-commands/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:http://www.cyberciti.biz/faq/unix-verify-tape-backup/
|
||||
[2]:http://www.manpager.com/linux/man1/mt.1.html
|
||||
[3]:http://www.manpager.com/linux/man1/mtx.1.html
|
||||
[4]:http://www.manpager.com/linux/man1/tar.1.html
|
||||
[5]:http://www.manpager.com/linux/man8/dump.8.html
|
||||
[6]:http://www.manpager.com/linux/man8/restore.8.html
|
||||
@ -0,0 +1,40 @@
|
||||
Backup (System Restore Point) your Ubuntu/Linux Mint with SystemBack
|
||||
================================================================================
|
||||
System Restore is must have feature for any OS that allows the user to revert their computer's state (including system files, installed applications, and system settings) to that of a previous point in time, which can be used to recover from system malfunctions or other problems.
|
||||
Sometimes installing a program or driver can make your OS go to blank screen. System Restore can return your PC's system files and programs to a time when everything was working fine, potentially preventing hours of troubleshooting headaches. It won't affect your documents, pictures, or other data.
|
||||
Simple system backup and restore application with extra features. [Systemback][1] makes it easy to create backups of system and users configuration files. In case of problems you can easily restore the previous state of the system. There are extra features like system copying, system installation and Live system creation.
|
||||
|
||||
Screenshots
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
**Note**: Using System Restore will not restore documents, music, emails, or personal files of any kind. Depending on your perspective, this is both a positive and negative feature. The bad news is that it won't restore that accidentally deleted file you wish you could get back, though a file recovery program might solve that problem.
|
||||
If no restore point exists on your computer, System Restore has nothing to revert to so the tool won't work for you. If you're trying to recover from a major problem, you'll need to move on to another troubleshooting step.
|
||||
|
||||
>>> Available for Ubuntu 15.10 Wily/16.04/15.04 Vivid/14.04 Trusty/Linux Mint 17.x/other Ubuntu derivatives
|
||||
To install SystemBack Application in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
|
||||
|
||||
Terminal Commands:
|
||||
|
||||
sudo add-apt-repository ppa:nemh/systemback
|
||||
sudo apt-get update
|
||||
sudo apt-get install systemback
|
||||
|
||||
That's it
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.noobslab.com/2015/11/backup-system-restore-point-your.html
|
||||
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:https://launchpad.net/systemback
|
||||
@ -0,0 +1,108 @@
|
||||
8 things to do after installing openSUSE Leap 42.1
|
||||
================================================================================
|
||||
|
||||
Credit: [Metropolitan Transportation/Flicrk][1]
|
||||
|
||||
> You've installed openSUSE on your PC. Here's what to do next.
|
||||
|
||||
[openSUSE Leap is indeed a huge leap][2], allowing users to run a distro that has the same DNA of SUSE Linux Enterprise. Like any other operating system, some work is needed to get it set up for optimal use.
|
||||
|
||||
Following are some of the things that I did after installing openSUSE Leap on my PC (these are not applicable for server installations). None of them are mandatory, and you may be fine with the basic install. But if you need more out of your openSUSE Leap, follow me.
|
||||
|
||||
### 1. Adding Packman repository ###
|
||||
|
||||
Due to software patents and licences, openSUSE, like many Linux distributions, doesn't offer many applications, codecs, and drivers through official repositories (repos). Instead, these are made available through 3rd party or community repos. The first and most important repository is 'Packman'. Since these repos are not enabled by default, we have to add them. You can do so either using YaST (one of the gems of openSUSE) or by command line (instructions below).
|
||||
|
||||
|
||||
Adding Packman repositories.
|
||||
|
||||
Using YaST, go to the Software Repositories section. Click on the 'Add’ button and select 'Community Repositories.' Click 'next.' And once the repos are loaded, select the Packman Repository. Click 'OK,' then import the trusted GnuPG key by clicking on the 'Trust' button.
|
||||
|
||||
Or, using the terminal you can add and enable the Packman repo using the following command:
|
||||
|
||||
zypper ar -f -n packmanhttp://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Leap_42.1/ packman
|
||||
|
||||
Once the repo is added, you have access to many more packages. To install any application or package, open YaST Software Manager, search for the package and install it.
|
||||
|
||||
### 2. Install VLC ###
|
||||
|
||||
VLC is the Swiss Army knife of media players and can play virtually any media file. You can install VLC from YaST Software Manager or from software.opensuse.org. You will need to install two packages: vlc and vlc-codecs.
|
||||
|
||||
If using terminal, run the following command:
|
||||
|
||||
sudo zypper install vlc vlc-codecs
|
||||
|
||||
### 3. Install Handbrake ###
|
||||
|
||||
If you need to transcode or convert your video files from one format to another, [Handbrake is the tools for you][3]. Handbrake is available through repositories we enabled, so just search for it in YaST and install.
|
||||
|
||||
If you are using the terminal, run the following command:
|
||||
|
||||
sudo zypper install handbrake-cli handbrake-gtk
|
||||
|
||||
(Pro tip: VLC can also transcode audio and video files.)
|
||||
|
||||
### 4. Install Chrome ###
|
||||
|
||||
OpenSUSE comes with Firefox as the default browser. But since Firefox isn't capable of playing restricted media such as Netflix, I recommend installing Chrome. This takes some extra work. First you need to import the trusted key from Google. Open the terminal app and run the 'wget' command to download the key:
|
||||
|
||||
wget https://dl.google.com/linux/linux_signing_key.pub
|
||||
|
||||
Then import the key:
|
||||
|
||||
sudo rpm --import linux_signing_key.pub
|
||||
|
||||
Now head over to the [Google Chrome website][4] and download the 64 bit .rpm file. Once downloaded run the following command to install the browser:
|
||||
|
||||
sudo zypper install /PATH_OF_GOOGLE_CHROME.rpm
|
||||
|
||||
### 5. Install Nvidia drivers ###
|
||||
|
||||
OpenSUSE Leap will work out of the box even if you have Nvidia or ATI graphics cards. However, if you do need the proprietary drivers for gaming or any other purpose, you can install such drivers, but some extra work is needed.
|
||||
|
||||
First you need to add the Nvidia repositories; it's the same procedure we used to add Packman repositories using YaST. The only difference is that you will choose Nvidia from the Community Repositories section. Once it's added, go to **Software Management > Extras** and select 'Extras/Install All Matching Recommended Packages'.
|
||||
|
||||
|
||||
|
||||
It will open a dialogue box showing all the packages it's going to install, click OK and follow the instructions. You can also run the following command after adding the Nvidia repository to install the needed Nvidia drivers:
|
||||
|
||||
sudo zypper inr
|
||||
|
||||
(Note: I have never used AMD/ATI cards so I have no experience with them.)
|
||||
|
||||
### 6. Install media codecs ###
|
||||
|
||||
Once you have VLC installed you won't need to install media codecs, but if you are using other apps for media playback you will need to install such codecs. Some developers have written scripts/tools which makes it a much easier process. Just go to [this page][5] and install the entire pack by clicking on the appropriate button. It will open YaST and install the packages automatically (of source you will have to give the root password and trust the GnuPG key, as usual).
|
||||
|
||||
### 7. Install your preferred email client ###
|
||||
|
||||
OpenSUSE comes with Kmail or Evolution, depending on the Desktop Environment you installed on the system. I run Plasma, which comes with Kmail, and this email client leaves a lot to be desired. I suggest trying Thunderbird or Evolution mail. All major email clients are available through official repositories. You can also check my [handpicked list of the best email clients for Linux][7].
|
||||
|
||||
### 8. Enable Samba services from Firewall ###
|
||||
|
||||
OpenSUSE offers a much more secure system out of the box, compared to other distributions. But it also requires a little bit more work for a new user. If you are using Samba protocol to share files within your local network then you will have to allow that service from the Firewall.
|
||||
|
||||
|
||||
Allow Samba Client and Server from Firewall settings.
|
||||
|
||||
Open YaST and search for Firewall. Once in Firewall settings, go to 'Allowed Services' where you will see a drop down list under 'Service to allow.' Select 'Samba Client,' then click 'Add.' Do the same with the 'Samba Server' option. Once both are added, click 'Next,' then click 'Finish,' and now you will be able to share folders from your openSUSE system and also access other machines over the local network.
|
||||
|
||||
That's pretty much all that I did on my new openSUSE system to set it up just the way I like it. If you have any questions, please feel free to ask in the comments below.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.itworld.com/article/3003865/open-source-tools/8-things-to-do-after-installing-opensuse-leap-421.html
|
||||
|
||||
作者：[Swapnil Bhartiya][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.itworld.com/author/Swapnil-Bhartiya/
|
||||
[1]:https://www.flickr.com/photos/mtaphotos/11200079265/
|
||||
[2]:https://www.linux.com/news/software/applications/865760-opensuse-leap-421-review-the-most-mature-linux-distribution
|
||||
[3]:https://www.linux.com/learn/tutorials/857788-how-to-convert-videos-in-linux-using-the-command-line
|
||||
[4]:https://www.google.com/intl/en/chrome/browser/desktop/index.html#brand=CHMB&utm_campaign=en&utm_source=en-ha-na-us-sk&utm_medium=ha
|
||||
[5]:http://opensuse-community.org/
|
||||
[6]:http://www.itworld.com/article/2875981/the-5-best-open-source-email-clients-for-linux.html
|
||||
43
sources/tech/20151202 A new Mindcraft moment.md
Normal file
43
sources/tech/20151202 A new Mindcraft moment.md
Normal file
@ -0,0 +1,43 @@
|
||||
A new Mindcraft moment?
|
||||
=======================
|
||||
|
||||
Credit:Jonathan Corbet
|
||||
|
||||
It is not often that Linux kernel development attracts the attention of a mainstream newspaper like The Washington Post; lengthy features on the kernel community's approach to security are even more uncommon. So when just such a feature hit the net, it attracted a lot of attention. This article has gotten mixed reactions, with many seeing it as a direct attack on Linux. The motivations behind the article are hard to know, but history suggests that we may look back on it as having given us a much-needed push in a direction we should have been going for some time.
|
||||
|
||||
Think back, a moment, to the dim and distant past — April 1999, to be specific. An analyst company named Mindcraft issued a report showing that Windows NT greatly outperformed Red Hat Linux 5.2 and Apache for web-server workloads. The outcry from the Linux community, including from a very young LWN, was swift and strong. The report was a piece of Microsoft-funded FUD trying to cut off an emerging threat to its world-domination plans. The Linux system had been deliberately configured for poor performance. The hardware chosen was not well supported by Linux at the time. And so on.
|
||||
|
||||
Once people calmed down a bit, though, one other fact came clear: the Mindcraft folks, whatever their motivations, had a point. Linux did, indeed, have performance problems that were reasonably well understood even at the time. The community then did what it does best: we sat down and fixed the problems. The scheduler got exclusive wakeups, for example, to put an end to thethundering-herd problem in the acceptance of connection requests. Numerous other little problems were fixed. Within a year or so, the kernel's performance on this kind of workload had improved considerably.
|
||||
|
||||
The Mindcraft report, in other words, was a much-needed kick in the rear that got the community to deal with issues that had been neglected until then.
|
||||
|
||||
The Washington Post article seems clearly slanted toward a negative view of the Linux kernel and its contributors. It freely mixes kernel problems with other issues (the AshleyMadison.com breakin, for example) that were not kernel vulnerabilities at all. The fact that vendors seem to have little interest in getting security fixes to their customers is danced around like a huge elephant in the room. There are rumors of dark forces that drove the article in the hopes of taking Linux down a notch. All of this could well be true, but it should not be allowed to overshadow the simple fact that the article has a valid point.
|
||||
|
||||
We do a reasonable job of finding and fixing bugs. Problems, whether they are security-related or not, are patched quickly, and the stable-update mechanism makes those patches available to kernel users. Compared to a lot of programs out there (free and proprietary alike), the kernel is quite well supported. But pointing at our ability to fix bugs is missing a crucial point: fixing security bugs is, in the end, a game of whack-a-mole. There will always be more moles, some of which we will not know about (and will thus be unable to whack) for a long time after they are discovered and exploited by attackers. These bugs leave our users vulnerable, even if the commercial side of Linux did a perfect job of getting fixes to users — which it decidedly does not.
|
||||
|
||||
The point that developers concerned about security have been trying to make for a while is that fixing bugs is not enough. We must instead realize that we will never fix them all and focus on making bugs harder to exploit. That means restricting access to information about the kernel, making it impossible for the kernel to execute code in user-space memory, instrumenting the kernel to detect integer overflows, and all the other things laid out in Kees Cook's Kernel Summit talk at the end of October. Many of these techniques are well understood and have been adopted by other operating systems; others will require innovation on our part. But, if we want to adequately defend our users from attackers, these changes need to be made.
|
||||
|
||||
Why hasn't the kernel adopted these technologies already? The Washington Post article puts the blame firmly on the development community, and on Linus Torvalds in particular. The culture of the kernel community prioritizes performance and functionality over security and is unwilling to make compromises if they are needed to improve the security of the kernel. There is some truth to this claim; the good news is that attitudes appear to be shifting as the scope of the problem becomes clear. Kees's talk was well received, and it clearly got developers thinking and talking about the issues.
|
||||
|
||||
The point that has been missed is that we do not just have a case of Linus fending off useful security patches. There simply are not many such patches circulating in the kernel community. In particular, the few developers who are working in this area have never made a serious attempt to get that work integrated upstream. Getting any large, intrusive patch set merged requires working with the kernel community, making the case for the changes, splitting the changes into reviewable pieces, dealing with review comments, and so on. It can be tiresome and frustrating, but it's how the kernel works, and it clearly results in a more generally useful, more maintainable kernel in the long run.
|
||||
|
||||
Almost nobody is doing that work to get new security technologies into the kernel. One might cite a "chilling effect" from the hostile reaction such patches can receive, but that is an inadequate answer: developers have managed to merge many changes over the years despite a difficult initial reaction. Few security developers are even trying.
|
||||
|
||||
Why aren't they trying? One fairly obvious answer is that almost nobody is being paid to try. Almost all of the work going into the kernel is done by paid developers and has been for many years. The areas that companies see fit to support get a lot of work and are well advanced in the kernel. The areas that companies think are not their problem are rather less so. The difficulties in getting support for realtime development are a clear case in point. Other areas, such as documentation, tend to languish as well. Security is clearly one of those areas. There are a lot of reasons why Linux lags behind in defensive security technologies, but one of the key ones is that the companies making money on Linux have not prioritized the development and integration of those technologies.
|
||||
|
||||
There are signs that things might be changing a bit. More developers are showing interest in security-related issues, though commercial support for their work is still less than it should be. The reaction against security-related changes might be less knee-jerk negative than it used to be. Efforts like the Kernel Self Protection Project are starting to work on integrating existing security technologies into the kernel.
|
||||
|
||||
We have a long way to go, but, with some support and the right mindset, a lot of progress can be made in a short time. The kernel community can do amazing things when it sets its mind to it. With luck, the Washington Post article will help to provide the needed impetus for that sort of setting of mind. History suggests that we will eventually see this moment as a turning point, when we were finally embarrassed into doing work that has clearly needed doing for a while. Linux should not have a substandard security story for much longer.
|
||||
|
||||
---------------------------
|
||||
|
||||
via: https://lwn.net/Articles/663474/
|
||||
|
||||
作者：Jonathan Corbet
|
||||
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
@ -0,0 +1,175 @@
|
||||
How to Install Laravel PHP Framework on CentOS 7 / Ubuntu 15.04
|
||||
================================================================================
|
||||
Hi All, In this article we are going to setup Laravel on CentOS 7 and Ubuntu 15.04. If you are a PHP web developer then you don't need to worry about of all modern PHP frameworks, Laravel is the easiest to get up and running that saves your time and effort and makes web development a joy. Laravel embraces a general development philosophy that sets a high priority on creating maintainable code by following some simple guidelines, you should be able to keep a rapid pace of development and be free to change your code with little fear of breaking existing functionality.
|
||||
|
||||
Laravel's PHP framework installation is not a big deal. You can simply follow the step by step guide in this article for your CentOS 7 or Ubuntu 15 server.
|
||||
|
||||
### 1) Server Requirements ###
|
||||
|
||||
Laravel depends upon a number of prerequisites that must be setup before installing it. Those prerequisites includes some basic tuning parameter of server like your system update, sudo rights and installation of required packages.
|
||||
|
||||
Once you are connected to your server make sure to configure the fully qualified domain name then run the commands below to enable EPEL Repo and update your server.
|
||||
|
||||
#### CentOS-7 ####
|
||||
|
||||
# yum install epel-release
|
||||
|
||||
----------
|
||||
|
||||
# rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
|
||||
# rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
|
||||
|
||||
----------
|
||||
|
||||
# yum update
|
||||
|
||||
#### Ubuntu ####
|
||||
|
||||
# apt-get install python-software-properties
|
||||
# add-apt-repository ppa:ondrej/php5
|
||||
|
||||
----------
|
||||
|
||||
# apt-get update
|
||||
|
||||
----------
|
||||
|
||||
# apt-get install -y php5 mcrypt php5-mcrypt php5-gd
|
||||
|
||||
### 2) Firewall Setup ###
|
||||
|
||||
System Firewall and SELinux setup is an important part regarding the security of your applications in production. You can make firewall off if you are working on test server and keep SELinux to permissive mode using the below command, so that you installing setup won't be affected by it.
|
||||
|
||||
# setenforce 0
|
||||
|
||||
### 3) Apache, MariaDB, PHP Setup ###
|
||||
|
||||
Laravel installation requires a complete LAMP stack with OpenSSL, PDO, Mbstring and Tokenizer PHP Extensions. If you are already running LAMP server then you can skip this step to move on and just make sure that the required PHP extensions are installed.
|
||||
|
||||
To install AMP stack you can use the below commands on your respective server.
|
||||
|
||||
#### CentOS ####
|
||||
|
||||
# yum install httpd mariadb-server php56w php56w-mysql php56w-mcrypt php56w-dom php56w-mbstring
|
||||
|
||||
To start and enable Apache web and MySQL/Mariadb services at bootup on CentOS 7 , we will use below commands.
|
||||
|
||||
# systemctl start httpd
|
||||
# systemctl enable httpd
|
||||
|
||||
----------
|
||||
|
||||
#systemctl start mysqld
|
||||
#systemctl enable mysqld
|
||||
|
||||
After starting MariaDB service, we will configure its secured password with below command.
|
||||
|
||||
#mysql_secure_installation
|
||||
|
||||
#### Ubuntu ####
|
||||
|
||||
# apt-get install mysql-server apache2 libapache2-mod-php5 php5-mysql
|
||||
|
||||
### 4) Install Composer ###
|
||||
|
||||
Now we are going to install composer that is one of the most important requirement before starting the Laravel installation that helps in installing Laravel's dependencies.
|
||||
|
||||
#### CentOS/Ubuntu ####
|
||||
|
||||
Run the below commands to setup 'composer' in CentOS/Ubuntu.
|
||||
|
||||
# curl -sS https://getcomposer.org/installer | php
|
||||
# mv composer.phar /usr/local/bin/composer
|
||||
# chmod +x /usr/local/bin/composer
|
||||
|
||||
|
||||
|
||||
### 5) Installing Laravel ###
|
||||
|
||||
Laravel's installation package can be downloaded from github using the command below.
|
||||
|
||||
# wget https://github.com/laravel/laravel/archive/develop.zip
|
||||
|
||||
To extract the archived package and move into the document root directory use below commands.
|
||||
|
||||
# unzip develop.zip
|
||||
|
||||
----------
|
||||
|
||||
# mv laravel-develop /var/www/
|
||||
|
||||
Now use the following compose command that will install all required dependencies for Laravel within its directory.
|
||||
|
||||
# cd /var/www/laravel-develop/
|
||||
# composer install
|
||||
|
||||
|
||||
|
||||
### 6) Key Encryption ###
|
||||
|
||||
For encrypter service, we will be generating a 32 digit encryption key using the command below.
|
||||
|
||||
# php artisan key:generate
|
||||
|
||||
Application key [Lf54qK56s3qDh0ywgf9JdRxO2N0oV9qI] set successfully
|
||||
|
||||
Now put this key into the 'app.php' file as shown below.
|
||||
|
||||
# vim /var/www/laravel-develop/config/app.php
|
||||
|
||||
|
||||
|
||||
### 7) Virtua Host and Ownership ###
|
||||
|
||||
After composer installation assign the permissions and apache user ownership to the document root directory as shown.
|
||||
|
||||
# chmod 775 /var/www/laravel-develop/app/storage
|
||||
|
||||
----------
|
||||
|
||||
# chown -R apache:apache /var/www/laravel-develop
|
||||
|
||||
Open the default configuration file of apache web server using any editor to add the following lines at the end file for new virtual host entry.
|
||||
|
||||
# vim /etc/httpd/conf/httpd.conf
|
||||
|
||||
----------
|
||||
|
||||
ServerName laravel-develop
|
||||
DocumentRoot /var/www/laravel/public
|
||||
|
||||
start Directory /var/www/laravel
|
||||
AllowOverride All
|
||||
Directory close
|
||||
|
||||
Now the time is to restart apache web server services as shown below and then open your web browser to check your localhost page.
|
||||
|
||||
#### CentOS ####
|
||||
|
||||
# systemctl restart httpd
|
||||
|
||||
#### Ubuntu ####
|
||||
|
||||
# service apache2 restart
|
||||
|
||||
### 8) Laravel 5 Web Access ###
|
||||
|
||||
Open your web browser and give your server IP or Fully Qualified Domain name and you will see the default web page of Laravel 5 frame work.
|
||||
|
||||
|
||||
|
||||
### Conclusion ###
|
||||
|
||||
Laravel Framework is a great tool to develop your web applications. So, at the end of this article you have learned its installation setup on Ubuntu 15 and CentOS 7 , Now start using this awesome PHP framework that provides you a lot of more features and comfort in your development work. Feel free to comment us back for your valuable suggestions an feedback to guide you in more specific and easiest way.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://linoxide.com/linux-how-to/install-laravel-php-centos-7-ubuntu-15-04/
|
||||
|
||||
作者：[Kashif][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/kashifs/
|
||||
@ -0,0 +1,145 @@
|
||||
Install and Configure Munin monitoring server in Linux
|
||||
================================================================================
|
||||
|
||||
|
||||
Munin is an excellent system monitoring tool similar to [RRD tool][1] which will give you ample information about system performance in multiple fronts like **disk, network, process, system and users**. These are some of the default properties Munin monitors.
|
||||
|
||||
### How Munin works? ###
|
||||
|
||||
Munin works in a client-server model. Munin server process on main server try to collect data from client daemon which is running locally(Munin can monitor it’ss own resources) or from remote client(Munin can monitor hundreds of machines) and displays them in graphs on its web interface.
|
||||
|
||||
### Configuring Munin in nutshell ###
|
||||
|
||||
This is of two steps as we have to configure both server and client.
|
||||
1)Install Munin server package and configure it so that it get data from clients.
|
||||
2)Configure Munin client so that server will connect to client daemon for data collocation.
|
||||
|
||||
### Install munin server in Linux ###
|
||||
|
||||
Munin server installation on Ubuntu/Debian based machines
|
||||
|
||||
apt-get install munin apache2
|
||||
|
||||
Munin server installation on Redhat/Centos based machines. Make sure that you [enable EPEL repo][2] before installing Munin on Redhat based machines as by default Redhat based machines do not have Munin in their repos.
|
||||
|
||||
yum install munin httpd
|
||||
|
||||
### Configuring Munin server in Linux ###
|
||||
|
||||
Below are the steps we have to do in order to bring server up.
|
||||
|
||||
1. Add host details which need monitoring in /etc/munin/munin.conf
|
||||
1. Configure apache web server to include munin details.
|
||||
1. Create User name and password for web interface
|
||||
1. Restart apache server
|
||||
|
||||
**Step 1**: Add hosts entry in this file in **/etc/munin/munin.conf**. Go to end of the file and a client to monitor. Here in this example, I added my DB server and its IP address to monitor
|
||||
|
||||
Example:
|
||||
|
||||
[db.linuxnix.com]
|
||||
address 192.168.1.25
|
||||
use_node_name yes
|
||||
|
||||
Save the file and exit.
|
||||
|
||||
**Step 2**: Edit/create munin.conf file in /etc/apache2/conf.d folder to include Munin Apache related configs. In another note, by default other Munin web related configs are kept in /var/www/munin folder.
|
||||
|
||||
vi /etc/apache2/conf.d/munin.conf
|
||||
|
||||
Content:
|
||||
|
||||
Alias /munin /var/www/munin
|
||||
<Directory /var/www/munin>
|
||||
Order allow,deny
|
||||
Allow from localhost 127.0.0.0/8 ::1
|
||||
AllowOverride None
|
||||
Options ExecCGI FollowSymlinks
|
||||
AddHandler cgi-script .cgi
|
||||
DirectoryIndex index.cgi
|
||||
AuthUserFile /etc/munin/munin.passwd
|
||||
AuthType basic
|
||||
AuthName "Munin stats"
|
||||
require valid-user
|
||||
<IfModule mod_expires.c>
|
||||
ExpiresActive On
|
||||
ExpiresDefault M310
|
||||
</IfModule>
|
||||
</Directory>
|
||||
|
||||
Save the file and exit
|
||||
|
||||
**Step 3**: Now create a username and password for viewing muning graphs:
|
||||
|
||||
htpasswd -c /etc/munin/munin-htpasswd munin
|
||||
|
||||
**Note**: For Redhat/Centos machines replace “**apache2**” with “**httpd**” in each path to access your config files.
|
||||
|
||||
**Step 3**: Restart Apache server so that Munin configurations are picked-up by Apache.
|
||||
|
||||
#### Ubuntu/Debian based: ####
|
||||
|
||||
service apache2 restart
|
||||
|
||||
#### Centos/Redhat based: ####
|
||||
|
||||
service httpd restart
|
||||
|
||||
### Install and configure Munin client in Linux ###
|
||||
|
||||
**Step 1**: Install Munin client in Linux
|
||||
|
||||
apt-get install munin-node
|
||||
|
||||
**Note**: If you want to monitor your Munin server, then you have to install munin-node on that as well.
|
||||
|
||||
**Step 2**: Configure client by editing munin-node.conf file.
|
||||
|
||||
vi /etc/munin/munin-node.conf
|
||||
|
||||
Example:
|
||||
|
||||
allow ^127\.0\.0\.1$
|
||||
allow ^10\.10\.20\.20$
|
||||
|
||||
----------
|
||||
|
||||
# Which address to bind to;
|
||||
host *
|
||||
|
||||
----------
|
||||
|
||||
# And which port
|
||||
port 4949
|
||||
|
||||
**Note**: 10.10.20.20 is my Munin server and it connections to 4949 port on client to get its data.
|
||||
|
||||
**Step 3**: Restart munin-node on client server
|
||||
|
||||
service munin-node restart
|
||||
|
||||
### Testing connection ###
|
||||
|
||||
check if you are able to connect client from server on 4949 port, other wise you have to open that port on client machine.
|
||||
|
||||
telnet db.linuxnix.com 4949
|
||||
|
||||
Accessing Munin web interface
|
||||
|
||||
http://munin.linuxnix.com/munin/index.html
|
||||
|
||||
Hope this helps to configure basic Munin server.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.linuxnix.com/install-and-configure-munin-monitoring-server-in-linux/
|
||||
|
||||
作者：[Surendra Anne][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.linuxnix.com/author/surendra/
|
||||
[1]:http://www.linuxnix.com/network-monitoringinfo-gathering-tools-in-linux/
|
||||
[2]:http://www.linuxnix.com/how-to-install-and-enable-epel-repo-in-rhel-centos-oracle-scentific-linux/
|
||||
196
sources/tech/20151204 Linux or Unix--jobs Command Examples.md
Normal file
196
sources/tech/20151204 Linux or Unix--jobs Command Examples.md
Normal file
@ -0,0 +1,196 @@
|
||||
translation by strugglingyouth
|
||||
Linux / Unix: jobs Command Examples
|
||||
================================================================================
|
||||
I am new Linux and Unix user. How do I show the active jobs on Linux or Unix-like systems using BASH/KSH/TCSH or POSIX based shell? How can I display status of jobs in the current session on Unix/Linux?
|
||||
|
||||
Job control is nothing but the ability to stop/suspend the execution of processes (command) and continue/resume their execution as per your requirements. This is done using your operating system and shell such as bash/ksh or POSIX shell.
|
||||
|
||||
You shell keeps a table of currently executing jobs and can be displayed with jobs command.
|
||||
|
||||
### Purpose ###
|
||||
|
||||
> Displays status of jobs in the current shell session.
|
||||
|
||||
### Syntax ###
|
||||
|
||||
The basic syntax is as follows:
|
||||
|
||||
jobs
|
||||
|
||||
OR
|
||||
|
||||
jobs jobID
|
||||
|
||||
OR
|
||||
|
||||
jobs [options] jobID
|
||||
|
||||
### Starting few jobs for demonstration purpose ###
|
||||
|
||||
Before you start using jobs command, you need to start couple of jobs on your system. Type the following commands to start jobs:
|
||||
|
||||
## Start xeyes, calculator, and gedit text editor ###
|
||||
xeyes &
|
||||
gnome-calculator &
|
||||
gedit fetch-stock-prices.py &
|
||||
|
||||
Finally, run ping command in foreground:
|
||||
|
||||
ping www.cyberciti.biz
|
||||
|
||||
To suspend ping command job hit the **Ctrl-Z** key sequence.
|
||||
|
||||
### jobs command examples ###
|
||||
|
||||
To display the status of jobs in the current shell, enter:
|
||||
|
||||
$ jobs
|
||||
|
||||
Sample outputs:
|
||||
|
||||
[1] 7895 Running gpass &
|
||||
[2] 7906 Running gnome-calculator &
|
||||
[3]- 7910 Running gedit fetch-stock-prices.py &
|
||||
[4]+ 7946 Stopped ping cyberciti.biz
|
||||
|
||||
To display the process ID or jobs for the job whose name begins with "p," enter:
|
||||
|
||||
$ jobs -p %p
|
||||
|
||||
OR
|
||||
|
||||
$ jobs %p
|
||||
|
||||
Sample outputs:
|
||||
|
||||
[4]- Stopped ping cyberciti.biz
|
||||
|
||||
The character % introduces a job specification. In this example, you are using the string whose name begins with suspended command such as %ping.
|
||||
|
||||
### How do I show process IDs in addition to the normal information? ###
|
||||
|
||||
Pass the -l(lowercase L) option to jobs command for more information about each job listed, run:
|
||||
|
||||
$ jobs -l
|
||||
|
||||
Sample outputs:
|
||||
|
||||
|
||||
Fig.01: Displaying the status of jobs in the shell
|
||||
|
||||
### How do I list only processes that have changed status since the last notification? ###
|
||||
|
||||
First, start a new job as follows:
|
||||
|
||||
$ sleep 100 &
|
||||
|
||||
Now, only show jobs that have stopped or exited since last notified, type:
|
||||
|
||||
$ jobs -n
|
||||
|
||||
Sample outputs:
|
||||
|
||||
[5]- Running sleep 100 &
|
||||
|
||||
### Display lists process IDs (PIDs) only ###
|
||||
|
||||
Pass the -p option to jobs command to display PIDs only:
|
||||
|
||||
$ jobs -p
|
||||
|
||||
Sample outputs:
|
||||
|
||||
7895
|
||||
7906
|
||||
7910
|
||||
7946
|
||||
7949
|
||||
|
||||
### How do I display only running jobs? ###
|
||||
|
||||
Pass the -r option to jobs command to display only running jobs only, type:
|
||||
|
||||
$ jobs -r
|
||||
|
||||
Sample outputs:
|
||||
|
||||
[1] Running gpass &
|
||||
[2] Running gnome-calculator &
|
||||
[3]- Running gedit fetch-stock-prices.py &
|
||||
|
||||
### How do I display only jobs that have stopped? ###
|
||||
|
||||
Pass the -s option to jobs command to display only stopped jobs only, type:
|
||||
|
||||
$ jobs -s
|
||||
|
||||
Sample outputs:
|
||||
|
||||
[4]+ Stopped ping cyberciti.biz
|
||||
|
||||
To resume the ping cyberciti.biz job by entering the following bg command:
|
||||
|
||||
$ bg %4
|
||||
|
||||
### jobs command options ###
|
||||
|
||||
From the [bash(1)][1] command man page:
|
||||
|
||||
注：表格
|
||||
<table border="1">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>Option</td>
|
||||
<td>Description</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><kbd><strong>-l</strong></kbd></td>
|
||||
<td>Show process id's in addition to the normal information.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><kbd><strong>-p</strong></kbd></td>
|
||||
<td>Show process id's only.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><kbd><strong>-n</strong></kbd></td>
|
||||
<td>Show only processes that have changed status since the last notification are printed.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><kbd><strong>-r</strong></kbd></td>
|
||||
<td>Restrict output to running jobs only.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><kbd><strong>-s</strong></kbd></td>
|
||||
<td>Restrict output to stopped jobs only.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><kbd><strong>-x</strong></kbd></td>
|
||||
<td>COMMAND is run after all job specifications that appear in ARGS have been replaced with the process ID of that job's process group leader./td></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
|
||||
### A note about /usr/bin/jobs and shell builtin ###
|
||||
|
||||
Type the following type command to find out whether jobs is part of shell, external command or both:
|
||||
|
||||
$ type -a jobs
|
||||
|
||||
Sample outputs:
|
||||
|
||||
jobs is a shell builtin
|
||||
jobs is /usr/bin/jobs
|
||||
|
||||
In almost all cases you need to use the jobs command that is implemented as a BASH/KSH/POSIX shell built-in. The /usr/bin/jobs command can not be used in the current shell. The /usr/bin/jobs command operates in a different environment and does not share the parent bash/ksh's shells understanding of jobs.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via:
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:http://www.manpager.com/linux/man1/bash.1.html
|
||||
@ -0,0 +1,54 @@
|
||||
NetworkManager and privacy in the IPv6 internet
|
||||
======================
|
||||
|
||||
IPv6 is gaining momentum. With growing use of the protocol concerns about privacy that were not initially anticipated arise. The Internet community actively publishes solutions to them. What’s the current state and how does NetworkManager catch up? Let’s figure out!
|
||||
|
||||
|
||||
|
||||
## The identity of a IPv6-connected host
|
||||
|
||||
The IPv6 enabled nodes don’t need a central authority similar to IPv4 [DHCP](https://tools.ietf.org/html/rfc2132) servers to configure their addresses. They discover the networks they are in and [complete the addresses themselves](https://tools.ietf.org/html/rfc4862) by generating the host part. This makes the network configuration simpler and scales better to larger networks. However, there’s some drawbacks to this approach. Firstly, the node needs to ensure that its address doesn’t collide with an address of any other node on the network. Secondly, if the node uses the same host part of the address in every network it enters then its movement can be tracked and the privacy is at risk.
|
||||
|
||||
Internet Engineering Task Force (IETF), the organization behind the Internet standards, [acknowledged this problem](https://tools.ietf.org/html/draft-iesg-serno-privacy-00) and recommends against use of hardware serial numbers to identify the node in the network.
|
||||
|
||||
But what does the actual implementation look like?
|
||||
|
||||
The problem of address uniqueness is addressed with [Duplicate Address Detection](https://tools.ietf.org/html/rfc4862#section-5.4) (DAD) mechanism. When a node creates an address for itself it first checks whether another node uses the same address using the [Neighbor Discovery Protocol](https://tools.ietf.org/html/rfc4861) (a mechanism not unlike IPv4 [ARP](https://tools.ietf.org/html/rfc826) protocol). When it discovers the address is already used, it must discard it.
|
||||
|
||||
The other problem (privacy) is a bit harder to solve. An IP address (be it IPv4 or IPv6) address consists of a network part and the host part. The host discovers the relevant network parts and is supposed generate the host part. Traditionally it just uses an Interface Identifier derived from the network hardware’s (MAC) address. The MAC address is set at manufacturing time and can uniquely identify the machine. This guarantees the address is stable and unique. That’s a good thing for address collision avoidance but a bad thing for privacy. The host part remaining constant in different network means that the machine can be uniquely identified as it enters different networks. This seemed like non-issue at the time the protocol was designed, but the privacy concerns arose as the IPv6 gained popularity. Fortunately, there’s a solution to this problem.
|
||||
|
||||
## Enter privacy extensions
|
||||
|
||||
It’s no secret that the biggest problem with IPv4 is that the addresses are scarce. This is no longer true with IPv6 and in fact an IPv6-enabled host can use addresses quite liberally. There’s absolutely nothing wrong with having multiple IPv6 addresses attached to the same interface. On the contrary, it’s a pretty standard situation. At the very minimum each node has an address that is used for contacting nodes on the same hardware link called a link-local address. When the network contains a router that connects it to other networks in the internet, a node has an address for every network it’s directly connected to. If a host has more addresses in the same network the node accepts incoming traffic for all of them. For the outgoing connections which, of course, reveal the address to the remote host, the kernel picks the fittest one. But which one is it?
|
||||
|
||||
With privacy extensions enabled, as defined by [RFC4941](https://tools.ietf.org/html/rfc4941), a new address with a random host part is generated every now and then. The newest one is used for new outgoing connections while the older ones are deprecated when they’re unused. This is a nifty trick — the host does not reveal the stable address as it’s not used for outgoing connections, but still accepts connections to it from the hosts that are aware of it.
|
||||
|
||||
There’s a downside to this. Certain applications tie the address to the user identity. Consider a web application that issues a HTTP Cookie for the user during the authentication but only accepts it for the connections that come from the address that conducted the authentications. As the kernel generates a new temporary address, the server would reject the requests that use it, effectively logging the user out. It could be argued that the address is not an appropriate mechanism for establishing user’s identity but that’s what some real-world applications do.
|
||||
|
||||
## Privacy stable addressing to the rescue
|
||||
|
||||
Another approach would be needed to cope with this. There’s a need for an address that is unique (of course), stable for a particular network but still changes when user enters another network so that tracking is not possible. The RFC7217 introduces a mechanism that provides exactly this.
|
||||
|
||||
Creation of a privacy stable address relies on a pseudo-random key that’s only known the host itself and never revealed to other hosts in the network. This key is then hashed using a cryptographically secure algorithm along with values specific for a particular network connection. It includes an identifier of the network interface, the network prefix and possibly other values specific to the network such as the wireless SSID. The use of the secret key makes it impossible to predict the resulting address for the other hosts while the network-specific data causes it to be different when entering a different network.
|
||||
|
||||
This also solves the duplicate address problem nicely. The random key makes collisions unlikely. If, in spite of this, a collision occurs then the hash can be salted with a DAD failure counter and a different address can be generated instead of failing the network connectivity. Now that’s clever.
|
||||
|
||||
Using privacy stable address doesn’t interfere with the privacy extensions at all. You can use the [RFC7217](https://tools.ietf.org/html/rfc7217) stable address while still employing the RFC4941 temporary addresses at the same time.
|
||||
|
||||
## Where does NetworkManager stand?
|
||||
|
||||
We’ve already enabled the privacy extensions with the release NetworkManager 1.0.4. They’re turned on by default; you can control them with ipv6.ip6-privacy property.
|
||||
|
||||
With the release of NetworkManager 1.2, we’re adding the stable privacy addressing. It’s supposed to address the situations where the privacy extensions don’t make the cut. The use of the feature is controlled with the ipv6.addr-gen-mode property. If it’s set to stable-privacy then stable privacy addressing is used. Setting it to “eui64” or not setting it at all preserves the traditional default behavior.
|
||||
|
||||
Stay tuned for NetworkManager 1.2 release in early 2016! If you want to try the bleeding-edge snapshot, give Fedora Rawhide a try. It will eventually become Fedora 24.
|
||||
|
||||
*I’d like to thank Hannes Frederic Sowa for a valuable feedback. The article would make less sense without his corrections. Hannes also created the in-kernel implementation of the RFC7217 mechanism which can be used when the networking is not managed by NetworkManager.*
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://blogs.gnome.org/lkundrak/2015/12/03/networkmanager-and-privacy-in-the-ipv6-internet/
|
||||
作者：[Lubomir Rintel]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
|
||||
46
sources/tech/20151206 Supporting secure DNS in glibc.md
Normal file
46
sources/tech/20151206 Supporting secure DNS in glibc.md
Normal file
@ -0,0 +1,46 @@
|
||||
Supporting secure DNS in glibc
|
||||
========================
|
||||
|
||||
Credit: Jonathan Corbet
|
||||
|
||||
One of the many weak links in Internet security is the domain name system (DNS); it is subject to attacks that, among other things, can mislead applications regarding the IP address of a system they wish to connect to. That, in turn, can cause connections to go to the wrong place, facilitating man-in-the-middle attacks and more. The DNSSEC protocol extensions are meant to address this threat by setting up a cryptographically secure chain of trust for DNS information. When DNSSEC is set up properly, applications should be able to trust the results of domain lookups. As the discussion over an attempt to better integrate DNSSEC into the GNU C Library shows, though, ensuring that DNS lookups are safe is still not a straightforward problem.
|
||||
|
||||
In a sense, the problem was solved years ago; one can configure a local nameserver to perform full DNSSEC verification and use that server via glibc calls in applications. DNSSEC can even be used to increase security in other areas; it can, for example, carry SSH or TLS key fingerprints, allowing applications to verify that they are talking to the right server. Things get tricky, though, when one wants to be sure that DNS results claiming to have DNSSEC verification are actually what they claim to be — when one wants the security that DNSSEC is meant to provide, in other words.
|
||||
|
||||
The /etc/resolv.conf problem
|
||||
|
||||
Part of the problem, from the glibc perspective, is that glibc itself does not do DNSSEC verification. Instead, it consults /etc/resolv.conf and asks the servers found therein to do the lookup and verification; the results are then returned to the application. If the application is using the low-level res_query() interface, those results may include the "authenticated data" (AD) flag (if the nameserver has set it) indicating that DNSSEC verification has been successfully performed. But glibc knows nothing about the trustworthiness of the nameserver that has provided those results, so it cannot tell the application anything about whether they should really be trusted.
|
||||
|
||||
One of the first steps suggested by glibc maintainer Carlos O'Donell is to add an option (dns-strip-dnssec-ad-bit) to the resolv.conf file telling glibc to unconditionally remove the AD bit. This option could be set by distributions to indicate that the DNS lookup results cannot be trusted at a DNSSEC level. Once things have been set up so that the results can be trusted, that option can be removed. In the meantime, though, applications would have a way to judge the DNS lookup results they get from glibc, something that does not exist now.
|
||||
|
||||
What would a trustworthy setup look like? The standard picture looks something like this: there is a local nameserver, accessed via the loopback interface, as the only entry in /etc/resolv.conf. That nameserver would be configured to do verification and, in the case that verification fails, simply return no results at all. There would, in almost all cases, be no need to worry about whether applications see the AD bit or not; if the results are not trustworthy, applications will simply not see them at all. A number of distributions are moving toward this model, but the situation is still not as simple as some might think.
|
||||
|
||||
One problem is that this scheme makes /etc/resolv.conf into a central point of trust for the system. But, in a typical Linux system, there are no end of DHCP clients, networking scripts, and more that will make changes to that file. As Paul Wouters pointed out, locking down this file in the short term is not really an option. Sometimes those changes are necessary: when a diskless system is booting, it may need name-resolution service before it is at a point where it can start up its own nameserver. A system's entire DNS environment may change depending on which network it is attached to. Systems in containers may be best configured to talk to a nameserver on the host. And so on.
|
||||
|
||||
So there seems to be a general belief that /etc/resolv.conf cannot really be trusted on current systems. Ideas to add secondary configuration files (/etc/secure-resolv.conf or whatever) have been floated, but they don't much change the basic nature of the situation. Beyond that, some participants felt that even a local nameserver running on the loopback interface is not really trustworthy; Zack Weinberg suggested that administrators might intentionally short out DNSSEC validation, for example.
|
||||
|
||||
Since the configuration cannot be trusted on current systems, the reasoning goes, glibc needs to have a way to indicate to applications when the situation has improved and things can be trusted. That could include the AD-stripping option described above (or, conversely, an explicit "this nameserver is trusted" option); that, of course, would require that the system be locked down to a level where surprising changes to /etc/resolv.conf no longer happen. A variant, as suggested by Petr Spacek, is to have a way for an application to ask glibc whether it is talking to a local nameserver or not.
|
||||
|
||||
Do it in glibc?
|
||||
|
||||
An alternative would be to dispense with the nameserver and have glibc do DNSSEC validation itself. There is, however, resistance to putting a big pile of cryptographic code into glibc itself. That would increase the size of the library and, it is felt, increase the attack surface of any application using it. A variant of this idea, suggested by Zack, would be to put the validation code into the name-service caching daemon (nscd) instead. Since nscd is part of glibc, it is under the control of the glibc developers and there could be a certain amount of confidence that DNSSEC validation is being performed properly. The location of the nscd socket is well known, so the /etc/resolv.confissues don't come into play. Carlos worried, though, that this approach might deter adoption by users who do not want the caching features of nscd; in his mind, that seems to rule out the nscd option.
|
||||
|
||||
So, in the short term, at least, it seems unlikely that glibc will take on the full task of performing validated DNSSEC lookups. That means that, if security-conscious applications are going to use glibc for their name lookups, the library will have to provide an indication of how trustworthy the results received from a separate nameserver are. And that will almost certainly require explicit action on the part of the distributor and/or system administrator. As Simo Sorce put it:
|
||||
|
||||
A situation in which glibc does not use an explicit configuration option to signal applications that it is using a trusted resolver is not useful ... no scratch that, it is actively harmful, because applications developers will quickly realize they cannot trust any information coming from glibc and will simply not use it for DNSSEC related information.
|
||||
|
||||
Configuring a system to properly use DNSSEC involves change to many of the components of that system — it is a distribution-wide problem that will take time to solve fully. The role that glibc plays in this transition is likely to be relatively small, but it is an important one: glibc is probably the only place where applications can receive some assurance that their DNS results are trustworthy without implementing their own resolver code. Running multiple DNSSEC implementations on a system seems like an unlikely path to greater security, so it would be good to get this right.
|
||||
|
||||
The glibc project has not yet chosen a path by which it intends to get things right, though some sort of annotation in /etc/resolv.conf looks like a likely outcome. Any such change would then have to get into a release; given the conservative nature of glibc development, it may already be late for the 2.23 release, which is likely to happen in February. So higher DNSSEC awareness in glibc may not happen right away, but there is at least some movement in that direction.
|
||||
|
||||
---------------------------
|
||||
|
||||
via: https://lwn.net/Articles/663474/
|
||||
|
||||
作者：Jonathan Corbet
|
||||
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
@ -0,0 +1,65 @@
|
||||
How to Customize Time & Date Format in Ubuntu Panel
|
||||
================================================================================
|
||||
|
||||
|
||||
This quick tutorial is going to show you how to customize your Time & Date indicator in Ubuntu panel, though there are already a few options available in the settings page.
|
||||
|
||||
|
||||
|
||||
To get started, search for and install **dconf Editor** in Ubuntu Software Center. Then launch the software and follow below steps:
|
||||
|
||||
**1.** When dconf Editor launches, navigate to **com -> canonical -> indicator -> datetime**. Set the value of **time-format** to **custom**.
|
||||
|
||||
|
||||
|
||||
You can also do this via a command in terminal:
|
||||
|
||||
gsettings set com.canonical.indicator.datetime time-format 'custom'
|
||||
|
||||
**2.** Now you can customize the Time & Date format by editing the value of **custom-time-format**.
|
||||
|
||||
|
||||
|
||||
You can also do this via command:
|
||||
|
||||
gsettings set com.canonical.indicator.datetime custom-time-format 'FORMAT_VALUE_HERE'
|
||||
|
||||
Interpreted sequences are:
|
||||
|
||||
- %a = abbreviated weekday name
|
||||
- %A = full weekday name
|
||||
- %b = abbreviated month name
|
||||
- %B = full month name
|
||||
- %d = day of month
|
||||
- %l = hour ( 1..12), %I = hour (01..12)
|
||||
- %k = hour ( 1..23), %H = hour (01..23)
|
||||
- %M = minute (00..59)
|
||||
- %p = AM or PM, %P = am or pm.
|
||||
- %S = second (00..59)
|
||||
- open terminal and run command `man date` to get more details.
|
||||
|
||||
Some examples:
|
||||
|
||||
custom time format value: **%a %H:%M %m/%d/%Y**
|
||||
|
||||
|
||||
|
||||
**%a %r %b %d or %a %I:%M:%S %p %b %d**
|
||||
|
||||
|
||||
|
||||
**%a %-d %b %l:%M %P %z**
|
||||
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://ubuntuhandbook.org/index.php/2015/12/time-date-format-ubuntu-panel/
|
||||
|
||||
作者：[Ji m][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://ubuntuhandbook.org/index.php/about/
|
||||
@ -0,0 +1,267 @@
|
||||
How to Install Bugzilla with Apache and SSL on FreeBSD 10.2
|
||||
================================================================================
|
||||
Bugzilla is open source web base application for bug tracker and testing tool, develop by mozilla project, and licensed under Mozilla Public License. It is used by high tech company like mozilla, redhat and gnome. Bugzilla was originally created by Terry Weissman in 1998. It written in perl, use MySQL as the database back-end. It is a server software designed to help you manage software development. Bugzilla has a lot of features, optimized database, excellent security, advanced search tool, integrated with email capabilities etc.
|
||||
|
||||
In this tutorial we will install bugzilla 5.0 with apache for the web server, and enable SSL for it. Then install mysql51 as the database system on freebsd 10.2.
|
||||
|
||||
#### Prerequisite ####
|
||||
|
||||
FreeBSD 10.2 - 64bit.
|
||||
Root privileges.
|
||||
|
||||
### Step 1 - Update System ###
|
||||
|
||||
Log in to the freebsd server with ssl login, and update the repository database :
|
||||
|
||||
sudo su
|
||||
freebsd-update fetch
|
||||
freebsd-update install
|
||||
|
||||
### Step 2 - Install and Configure Apache ###
|
||||
|
||||
In this step we will install apache from the freebsd repositories with pkg command. Then configure apache by editing file "httpd.conf" on apache24 directory, configure apache to use SSL, and CGI support.
|
||||
|
||||
Install apache with pkg command :
|
||||
|
||||
pkg install apache24
|
||||
|
||||
Go to the apache directory and edit the file "httpd.conf" with nanao editor :
|
||||
|
||||
cd /usr/local/etc/apache24
|
||||
nano -c httpd.conf
|
||||
|
||||
Uncomment the list line below :
|
||||
|
||||
#Line 70
|
||||
LoadModule authn_socache_module libexec/apache24/mod_authn_socache.so
|
||||
|
||||
#Line 89
|
||||
LoadModule socache_shmcb_module libexec/apache24/mod_socache_shmcb.so
|
||||
|
||||
# Line 117
|
||||
LoadModule expires_module libexec/apache24/mod_expires.so
|
||||
|
||||
#Line 141 to enabling SSL
|
||||
LoadModule ssl_module libexec/apache24/mod_ssl.so
|
||||
|
||||
# Line 162 for cgi support
|
||||
LoadModule cgi_module libexec/apache24/mod_cgi.so
|
||||
|
||||
# Line 174 to enable mod_rewrite
|
||||
LoadModule rewrite_module libexec/apache24/mod_rewrite.so
|
||||
|
||||
# Line 219 for the servername configuration
|
||||
ServerName 127.0.0.1:80
|
||||
|
||||
Save and exit.
|
||||
|
||||
Next, we need to install mod perl from freebsd repository, and then enable it :
|
||||
|
||||
pkg install ap24-mod_perl2
|
||||
|
||||
To enable mod_perl, edit httpd.conf and add to the "Loadmodule" line below :
|
||||
|
||||
nano -c httpd.conf
|
||||
|
||||
Add line below :
|
||||
|
||||
# Line 175
|
||||
LoadModule perl_module libexec/apache24/mod_perl.so
|
||||
|
||||
Save and exit.
|
||||
|
||||
And before start apache, add it to start at boot time with sysrc command :
|
||||
|
||||
sysrc apache24_enable=yes
|
||||
service apache24 start
|
||||
|
||||
### Step 3 - Install and Configure MySQL Database ###
|
||||
|
||||
We will use mysql51 for the database back-end, and it is support for perl module for mysql. Install mysql51 with pkg command below :
|
||||
|
||||
pkg install p5-DBD-mysql51 mysql51-server mysql51-client
|
||||
|
||||
Now we must add mysql to the boot time, and then start and configure the root password for mysql.
|
||||
|
||||
Run command below to do it all :
|
||||
|
||||
sysrc mysql_enable=yes
|
||||
service mysql-server start
|
||||
mysqladmin -u root password aqwe123
|
||||
|
||||
Note :
|
||||
|
||||
mysql password : aqwe123
|
||||
|
||||
|
||||
|
||||
Next, we will log in to the mysql shell with user root and password that we've configured above, then we will create new database and user for bugzilla installation.
|
||||
|
||||
Log in to the mysql shell with command below :
|
||||
|
||||
mysql -u root -p
|
||||
password: aqwe123
|
||||
|
||||
Add the database :
|
||||
|
||||
create database bugzilladb;
|
||||
create user bugzillauser@localhost identified by 'bugzillauser@';
|
||||
grant all privileges on bugzilladb.* to bugzillauser@localhost identified by 'bugzillauser@';
|
||||
flush privileges;
|
||||
\q
|
||||
|
||||
|
||||
|
||||
Database for bugzilla is created, database "bugzilladb" with user "bugzillauser" and password "bugzillauser@".
|
||||
|
||||
### Step 4 - Generate New SSL Certificate ###
|
||||
|
||||
Generate new self signed ssl certificate on directory "ssl" for bugzilla site.
|
||||
|
||||
Go to the apache24 directory and create new directory "ssl" on it :
|
||||
|
||||
cd /usr/local/etc/apache24/
|
||||
mkdir ssl; cd ssl
|
||||
|
||||
Next, generate the certificate file with openssl command, then change the permission of the certificate file :
|
||||
|
||||
sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /usr/local/etc/apache24/ssl/bugzilla.key -out /usr/local/etc/apache24/ssl/bugzilla.crt
|
||||
chmod 600 *
|
||||
|
||||
### Step 5 - Configure Virtualhost ###
|
||||
|
||||
We will install bugzilla on directory "/usr/local/www/bugzilla", so we must create new virtualhost configuration for it.
|
||||
|
||||
Go to the apache directory and create new directory called "vhost" for virtualhost file :
|
||||
|
||||
cd /usr/local/etc/apache24/
|
||||
mkdir vhost; cd vhost
|
||||
|
||||
Now create new file "bugzilla.conf" for the virtualhost file :
|
||||
|
||||
nano -c bugzilla.conf
|
||||
|
||||
Paste configuration below :
|
||||
|
||||
<VirtualHost *:80>
|
||||
ServerName mybugzilla.me
|
||||
ServerAlias www.mybuzilla.me
|
||||
DocumentRoot /usr/local/www/bugzilla
|
||||
Redirect permanent / https://mybugzilla.me/
|
||||
</VirtualHost>
|
||||
|
||||
Listen 443
|
||||
<VirtualHost _default_:443>
|
||||
ServerName mybugzilla.me
|
||||
DocumentRoot /usr/local/www/bugzilla
|
||||
|
||||
ErrorLog "/var/log/mybugzilla.me-error_log"
|
||||
CustomLog "/var/log/mybugzilla.me-access_log" common
|
||||
|
||||
SSLEngine On
|
||||
SSLCertificateFile /usr/local/etc/apache24/ssl/bugzilla.crt
|
||||
SSLCertificateKeyFile /usr/local/etc/apache24/ssl/bugzilla.key
|
||||
|
||||
<Directory "/usr/local/www/bugzilla">
|
||||
AddHandler cgi-script .cgi
|
||||
Options +ExecCGI
|
||||
DirectoryIndex index.cgi index.html
|
||||
AllowOverride Limit FileInfo Indexes Options
|
||||
Require all granted
|
||||
</Directory>
|
||||
</VirtualHost>
|
||||
|
||||
Save and exit.
|
||||
|
||||
If all is done, create new directory for bugzilla installation and then enable the bugzilla virtualhost by adding the virtualhost configuration to httpd.conf file.
|
||||
|
||||
Run command below on "apache24" directory :
|
||||
|
||||
mkdir -p /usr/local/www/bugzilla
|
||||
cd /usr/local/etc/apache24/
|
||||
nano -c httpd.conf
|
||||
|
||||
In the end of the line, add configuration below :
|
||||
|
||||
Include etc/apache24/vhost/*.conf
|
||||
|
||||
Save and exit.
|
||||
|
||||
Now test the apache configuration with "apachectl" command and restart it :
|
||||
|
||||
apachectl configtest
|
||||
service apache24 restart
|
||||
|
||||
### Step 6 - Install Bugzilla ###
|
||||
|
||||
We can install bugzilla manually by downloading the source, or install it from freebsd repository. In this step we will install bugzilla from freebsd repository with pkg command :
|
||||
|
||||
pkg install bugzilla50
|
||||
|
||||
If it's done, go to the bugzilla installation directory and install all perl module that needed by bugzilla.
|
||||
|
||||
cd /usr/local/www/bugzilla
|
||||
./install-module --all
|
||||
|
||||
Wait it until all is finished, it is take the time.
|
||||
|
||||
Next, generate the configuration file "localconfig" by executing "checksetup.pl" file on bugzilla installation directory.
|
||||
|
||||
./checksetup.pl
|
||||
|
||||
You will see the error message about the database configuration, so edit the file "localconfig" with nano editor :
|
||||
|
||||
nano -c localconfig
|
||||
|
||||
Now add the database that was created on step 3.
|
||||
|
||||
#Line 57
|
||||
$db_name = 'bugzilladb';
|
||||
|
||||
#Line 60
|
||||
$db_user = 'bugzillauser';
|
||||
|
||||
#Line 67
|
||||
$db_pass = 'bugzillauser@';
|
||||
|
||||
Save and exit.
|
||||
|
||||
Then run "checksetup.pl" again :
|
||||
|
||||
./checksetup.pl
|
||||
|
||||
You will be prompt about mail and administrator account, fill all of it with your email, user and password.
|
||||
|
||||
|
||||
|
||||
In the last, we need to change the owner of the installation directory to user "www", then restart apache with service command :
|
||||
|
||||
cd /usr/local/www/
|
||||
chown -R www:www bugzilla
|
||||
service apache24 restart
|
||||
|
||||
Now Bugzilla is installed, you can see it by visiting mybugzilla.me and you will be redirect to the https connection.
|
||||
|
||||
Bugzilla home page.
|
||||
|
||||
|
||||
|
||||
Bugzilla admin panel.
|
||||
|
||||
|
||||
|
||||
### Conclusion ###
|
||||
|
||||
Bugzilla is web based application help you to manage the software development. It is written in perl and use MySQL as the database system. Bugzilla used by mozilla, redhat, gnome etc for help their software development. Bugzilla has a lot of features and easy to configure and install.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://linoxide.com/tools/install-bugzilla-apache-ssl-freebsd-10-2/
|
||||
|
||||
作者：[Arul][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://linoxide.com/author/arulm/
|
||||
@ -0,0 +1,59 @@
|
||||
How to renew the ISPConfig 3 SSL Certificate
|
||||
================================================================================
|
||||
This tutorial describes the steps to renew the SSL Certificate of the ISPConfig 3 control panel. There are two alternative ways to achieve that:
|
||||
|
||||
- Create a new OpenSSL Certificate and CSR on the command line with OpenSSL.
|
||||
- Renew the SSL Certificate with the ISPConfig updater
|
||||
|
||||
I'll start with the manual way to renew the ssl cert.
|
||||
|
||||
### 1) Create a new ISPConfig 3 SSL Certificate with OpenSSL ###
|
||||
|
||||
Login to your server on the shell as root user. Before we create a new SSL Cert, backup the current ones. SSL Certs are security sensitive so I'll store the backup in the /root/ folder.
|
||||
|
||||
tar pcfz /root/ispconfig_ssl_backup.tar.gz /usr/local/ispconfig/interface/ssl
|
||||
chmod 600 /root/ispconfig_ssl_backup.tar.gz
|
||||
|
||||
> Now create a new SSL Certificate key, Certificate Request (csr) and a self signed Certificate.
|
||||
|
||||
cd /usr/local/ispconfig/interface/ssl
|
||||
openssl genrsa -des3 -out ispserver.key 4096
|
||||
openssl req -new -key ispserver.key -out ispserver.csr
|
||||
openssl x509 -req -days 3650 -in ispserver.csr \
|
||||
-signkey ispserver.key -out ispserver.crt
|
||||
openssl rsa -in ispserver.key -out ispserver.key.insecure
|
||||
mv ispserver.key ispserver.key.secure
|
||||
mv ispserver.key.insecure ispserver.key
|
||||
|
||||
Restart Apache to load the new SSL Certificate.
|
||||
|
||||
service apache2 restart
|
||||
|
||||
### 2) Renew the SSL Certificate with the ISPConfig installer ###
|
||||
|
||||
The alternative way to get a new SSL Certificate is to use the ISPConfig update script.
|
||||
Download ISPConfig to the /tmp folder, unpack the archive and start the update script.
|
||||
|
||||
cd /tmp
|
||||
wget http://www.ispconfig.org/downloads/ISPConfig-3-stable.tar.gz
|
||||
tar xvfz ISPConfig-3-stable.tar.gz
|
||||
cd ispconfig3_install/install
|
||||
php -q update.php
|
||||
|
||||
The update script will ask the following question during update:
|
||||
|
||||
Create new ISPConfig SSL certificate (yes,no) [no]:
|
||||
|
||||
Answer "yes" here and the SSL Certificate creation dialog will start.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.faqforge.com/linux/how-to-renew-the-ispconfig-3-ssl-certificate/
|
||||
|
||||
作者：[Till][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.faqforge.com/author/till/
|
||||
62
sources/tech/20151208 Install Wetty on Centos or RHEL 6.X.md
Normal file
62
sources/tech/20151208 Install Wetty on Centos or RHEL 6.X.md
Normal file
@ -0,0 +1,62 @@
|
||||
translation by strugglingyouth
|
||||
Install Wetty on Centos/RHEL 6.X
|
||||
================================================================================
|
||||
|
||||
|
||||
What is Wetty?
|
||||
|
||||
As a system administrator, you probably connect to remote servers using a program such as GNOME Terminal (or the like) if you’re on a Linux desktop, or a SSH client such as Putty if you have a Windows machine, while you perform other tasks like browsing the web or checking your email.
|
||||
|
||||
### Step 1: Install epel repo ###
|
||||
|
||||
# wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
|
||||
# rpm -ivh epel-release-6-8.noarch.rpm
|
||||
|
||||
### Step 2: Install dependencies ###
|
||||
|
||||
# yum install epel-release git nodejs npm -y
|
||||
|
||||
### Step 3: After installing these dependencies, clone the GitHub repository ###
|
||||
|
||||
# git clone https://github.com/krishnasrinivas/wetty
|
||||
|
||||
### Step 4: Run Wetty ###
|
||||
|
||||
# cd wetty
|
||||
# npm install
|
||||
|
||||
### Step 5: Starting Wetty and Access Linux Terminal from Web Browser ###
|
||||
|
||||
# node app.js -p 8080
|
||||
|
||||
### Step 6: Wetty through HTTPS ###
|
||||
|
||||
# openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365 -nodes (complete this)
|
||||
|
||||
### Step 7: launch Wetty via HTTPS ###
|
||||
|
||||
# nohup node app.js --sslkey key.pem --sslcert cert.pem -p 8080 &
|
||||
|
||||
### Step 8: Add an user for wetty ###
|
||||
|
||||
# useradd <username>
|
||||
# Passwd <username>
|
||||
|
||||
### Step 9: Access wetty ###
|
||||
|
||||
http://Your_IP-Address:8080
|
||||
give the credential have created before for wetty and access
|
||||
|
||||
Enjoy
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.unixmen.com/install-wetty-centosrhel-6-x/
|
||||
|
||||
作者：[Debojyoti Das][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.unixmen.com/author/debjyoti/
|
||||
@ -1,229 +0,0 @@
|
||||
Part 9 - LFCS: Linux Package Management with Yum, RPM, Apt, Dpkg, Aptitude and Zypper
|
||||
================================================================================
|
||||
Last August, the Linux Foundation announced the LFCS certification (Linux Foundation Certified Sysadmin), a shiny chance for system administrators everywhere to demonstrate, through a performance-based exam, that they are capable of succeeding at overall operational support for Linux systems. A Linux Foundation Certified Sysadmin has the expertise to ensure effective system support, first-level troubleshooting and monitoring, including finally issue escalation, when needed, to engineering support teams.
|
||||
|
||||
|
||||
|
||||
Linux Foundation Certified Sysadmin – Part 9
|
||||
|
||||
Watch the following video that explains about the Linux Foundation Certification Program.
|
||||
|
||||
注：youtube 视频
|
||||
<iframe width="720" height="405" frameborder="0" allowfullscreen="allowfullscreen" src="//www.youtube.com/embed/Y29qZ71Kicg"></iframe>
|
||||
|
||||
This article is a Part 9 of 10-tutorial long series, today in this article we will guide you about Linux Package Management, that are required for the LFCS certification exam.
|
||||
|
||||
### Package Management ###
|
||||
|
||||
In few words, package management is a method of installing and maintaining (which includes updating and probably removing as well) software on the system.
|
||||
|
||||
In the early days of Linux, programs were only distributed as source code, along with the required man pages, the necessary configuration files, and more. Nowadays, most Linux distributors use by default pre-built programs or sets of programs called packages, which are presented to users ready for installation on that distribution. However, one of the wonders of Linux is still the possibility to obtain source code of a program to be studied, improved, and compiled.
|
||||
|
||||
**How package management systems work**
|
||||
|
||||
If a certain package requires a certain resource such as a shared library, or another package, it is said to have a dependency. All modern package management systems provide some method of dependency resolution to ensure that when a package is installed, all of its dependencies are installed as well.
|
||||
|
||||
**Packaging Systems**
|
||||
|
||||
Almost all the software that is installed on a modern Linux system will be found on the Internet. It can either be provided by the distribution vendor through central repositories (which can contain several thousands of packages, each of which has been specifically built, tested, and maintained for the distribution) or be available in source code that can be downloaded and installed manually.
|
||||
|
||||
Because different distribution families use different packaging systems (Debian: *.deb / CentOS: *.rpm / openSUSE: *.rpm built specially for openSUSE), a package intended for one distribution will not be compatible with another distribution. However, most distributions are likely to fall into one of the three distribution families covered by the LFCS certification.
|
||||
|
||||
**High and low-level package tools**
|
||||
|
||||
In order to perform the task of package management effectively, you need to be aware that you will have two types of available utilities: low-level tools (which handle in the backend the actual installation, upgrade, and removal of package files), and high-level tools (which are in charge of ensuring that the tasks of dependency resolution and metadata searching -”data about the data”- are performed).
|
||||
|
||||
注：表格
|
||||
|
||||
<table cellspacing="0" border="0">
|
||||
<colgroup width="200">
|
||||
</colgroup>
|
||||
<colgroup width="200">
|
||||
</colgroup>
|
||||
<colgroup width="200">
|
||||
</colgroup>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td bgcolor="#AEA79F" align="CENTER" height="18" style="border: 1px solid #000001;"><b><span style="color: black;">DISTRIBUTION</span></b></td>
|
||||
<td bgcolor="#AEA79F" align="CENTER" style="border: 1px solid #000001;"><b><span style="color: black;">LOW-LEVEL TOOL</span></b></td>
|
||||
<td bgcolor="#AEA79F" align="CENTER" style="border: 1px solid #000001;"><b><span style="color: black;">HIGH-LEVEL TOOL</span></b></td>
|
||||
</tr>
|
||||
<tr class="alt">
|
||||
<td bgcolor="#FFFFFF" align="LEFT" height="18" style="border: 1px solid #000001;"><span style="color: black;"> Debian and derivatives</span></td>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" style="border: 1px solid #000001;"><span style="color: black;"> dpkg</span></td>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" style="border: 1px solid #000001;"><span style="color: black;"> apt-get / aptitude</span></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" height="18" style="border: 1px solid #000001;"><span style="color: black;"> CentOS</span></td>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" style="border: 1px solid #000001;"><span style="color: black;"> rpm</span></td>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" style="border: 1px solid #000001;"><span style="color: black;"> yum</span></td>
|
||||
</tr>
|
||||
<tr class="alt">
|
||||
<td bgcolor="#FFFFFF" align="LEFT" height="18" style="border: 1px solid #000001;"><span style="color: black;"> openSUSE</span></td>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" style="border: 1px solid #000001;"><span style="color: black;"> rpm</span></td>
|
||||
<td bgcolor="#FFFFFF" align="LEFT" style="border: 1px solid #000001;"><span style="color: black;"> zypper</span></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
|
||||
Let us see the descrption of the low-level and high-level tools.
|
||||
|
||||
dpkg is a low-level package manager for Debian-based systems. It can install, remove, provide information about and build *.deb packages but it can’t automatically download and install their corresponding dependencies.
|
||||
|
||||
- Read More: [15 dpkg Command Examples][1]
|
||||
|
||||
apt-get is a high-level package manager for Debian and derivatives, and provides a simple way to retrieve and install packages, including dependency resolution, from multiple sources using the command line. Unlike dpkg, apt-get does not work directly with *.deb files, but with the package proper name.
|
||||
|
||||
- Read More: [25 apt-get Command Examples][2]
|
||||
|
||||
aptitude is another high-level package manager for Debian-based systems, and can be used to perform management tasks (installing, upgrading, and removing packages, also handling dependency resolution automatically) in a fast and easy way. It provides the same functionality as apt-get and additional ones, such as offering access to several versions of a package.
|
||||
|
||||
rpm is the package management system used by Linux Standard Base (LSB)-compliant distributions for low-level handling of packages. Just like dpkg, it can query, install, verify, upgrade, and remove packages, and is more frequently used by Fedora-based distributions, such as RHEL and CentOS.
|
||||
|
||||
- Read More: [20 rpm Command Examples][3]
|
||||
|
||||
yum adds the functionality of automatic updates and package management with dependency management to RPM-based systems. As a high-level tool, like apt-get or aptitude, yum works with repositories.
|
||||
|
||||
- Read More: [20 yum Command Examples][4]
|
||||
-
|
||||
### Common Usage of Low-Level Tools ###
|
||||
|
||||
The most frequent tasks that you will do with low level tools are as follows:
|
||||
|
||||
**1. Installing a package from a compiled (*.deb or *.rpm) file**
|
||||
|
||||
The downside of this installation method is that no dependency resolution is provided. You will most likely choose to install a package from a compiled file when such package is not available in the distribution’s repositories and therefore cannot be downloaded and installed through a high-level tool. Since low-level tools do not perform dependency resolution, they will exit with an error if we try to install a package with unmet dependencies.
|
||||
|
||||
# dpkg -i file.deb [Debian and derivative]
|
||||
# rpm -i file.rpm [CentOS / openSUSE]
|
||||
|
||||
**Note**: Do not attempt to install on CentOS a *.rpm file that was built for openSUSE, or vice-versa!
|
||||
|
||||
**2. Upgrading a package from a compiled file**
|
||||
|
||||
Again, you will only upgrade an installed package manually when it is not available in the central repositories.
|
||||
|
||||
# dpkg -i file.deb [Debian and derivative]
|
||||
# rpm -U file.rpm [CentOS / openSUSE]
|
||||
|
||||
**3. Listing installed packages**
|
||||
|
||||
When you first get your hands on an already working system, chances are you’ll want to know what packages are installed.
|
||||
|
||||
# dpkg -l [Debian and derivative]
|
||||
# rpm -qa [CentOS / openSUSE]
|
||||
|
||||
If you want to know whether a specific package is installed, you can pipe the output of the above commands to grep, as explained in [manipulate files in Linux – Part 1][6] of this series. Suppose we need to verify if package mysql-common is installed on an Ubuntu system.
|
||||
|
||||
# dpkg -l | grep mysql-common
|
||||
|
||||
|
||||
|
||||
Check Installed Packages
|
||||
|
||||
Another way to determine if a package is installed.
|
||||
|
||||
# dpkg --status package_name [Debian and derivative]
|
||||
# rpm -q package_name [CentOS / openSUSE]
|
||||
|
||||
For example, let’s find out whether package sysdig is installed on our system.
|
||||
|
||||
# rpm -qa | grep sysdig
|
||||
|
||||
|
||||
|
||||
Check sysdig Package
|
||||
|
||||
**4. Finding out which package installed a file**
|
||||
|
||||
# dpkg --search file_name
|
||||
# rpm -qf file_name
|
||||
|
||||
For example, which package installed pw_dict.hwm?
|
||||
|
||||
# rpm -qf /usr/share/cracklib/pw_dict.hwm
|
||||
|
||||
|
||||
|
||||
Query File in Linux
|
||||
|
||||
### Common Usage of High-Level Tools ###
|
||||
|
||||
The most frequent tasks that you will do with high level tools are as follows.
|
||||
|
||||
**1. Searching for a package**
|
||||
|
||||
aptitude update will update the list of available packages, and aptitude search will perform the actual search for package_name.
|
||||
|
||||
# aptitude update && aptitude search package_name
|
||||
|
||||
In the search all option, yum will search for package_name not only in package names, but also in package descriptions.
|
||||
|
||||
# yum search package_name
|
||||
# yum search all package_name
|
||||
# yum whatprovides “*/package_name”
|
||||
|
||||
Let’s supposed we need a file whose name is sysdig. To know that package we will have to install, let’s run.
|
||||
|
||||
# yum whatprovides “*/sysdig”
|
||||
|
||||
|
||||
|
||||
Check Package Description
|
||||
|
||||
whatprovides tells yum to search the package the will provide a file that matches the above regular expression.
|
||||
|
||||
# zypper refresh && zypper search package_name [On openSUSE]
|
||||
|
||||
**2. Installing a package from a repository**
|
||||
|
||||
While installing a package, you may be prompted to confirm the installation after the package manager has resolved all dependencies. Note that running update or refresh (according to the package manager being used) is not strictly necessary, but keeping installed packages up to date is a good sysadmin practice for security and dependency reasons.
|
||||
|
||||
# aptitude update && aptitude install package_name [Debian and derivatives]
|
||||
# yum update && yum install package_name [CentOS]
|
||||
# zypper refresh && zypper install package_name [openSUSE]
|
||||
|
||||
**3. Removing a package**
|
||||
|
||||
The option remove will uninstall the package but leaving configuration files intact, whereas purge will erase every trace of the program from your system.
|
||||
# aptitude remove / purge package_name
|
||||
# yum erase package_name
|
||||
|
||||
---Notice the minus sign in front of the package that will be uninstalled, openSUSE ---
|
||||
|
||||
# zypper remove -package_name
|
||||
|
||||
Most (if not all) package managers will prompt you, by default, if you’re sure about proceeding with the uninstallation before actually performing it. So read the onscreen messages carefully to avoid running into unnecessary trouble!
|
||||
|
||||
**4. Displaying information about a package**
|
||||
|
||||
The following command will display information about the birthday package.
|
||||
|
||||
# aptitude show birthday
|
||||
# yum info birthday
|
||||
# zypper info birthday
|
||||
|
||||
|
||||
|
||||
Check Package Information
|
||||
|
||||
### Summary ###
|
||||
|
||||
Package management is something you just can’t sweep under the rug as a system administrator. You should be prepared to use the tools described in this article at a moment’s notice. Hope you find it useful in your preparation for the LFCS exam and for your daily tasks. Feel free to leave your comments or questions below. We will be more than glad to get back to you as soon as possible.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.tecmint.com/linux-package-management/
|
||||
|
||||
作者：[Gabriel Cánepa][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]:http://www.tecmint.com/author/gacanepa/
|
||||
[1]:http://www.tecmint.com/dpkg-command-examples/
|
||||
[2]:http://www.tecmint.com/useful-basic-commands-of-apt-get-and-apt-cache-for-package-management/
|
||||
[3]:http://www.tecmint.com/20-practical-examples-of-rpm-commands-in-linux/
|
||||
[4]:http://www.tecmint.com/20-linux-yum-yellowdog-updater-modified-commands-for-package-mangement/
|
||||
[5]:http://www.tecmint.com/sed-command-to-create-edit-and-manipulate-files-in-linux/
|
||||
@ -1,8 +1,9 @@
|
||||
Learn with Linux: Physics Simulation
|
||||
[bazz222222]
|
||||
Linux 学习系列之物理模拟
|
||||
================================================================================
|
||||
|
||||
|
||||
This article is part of the [Learn with Linux][1] series:
|
||||
[Linux 学习系列][1]的所有文章：
|
||||
|
||||
- [Learn with Linux: Learning to Type][2]
|
||||
- [Learn with Linux: Physics Simulation][3]
|
||||
@ -104,4 +105,4 @@ via: https://www.maketecheasier.com/linux-physics-simulation/
|
||||
[7]:https://edu.kde.org/applications/all/step
|
||||
[8]:https://edu.kde.org/
|
||||
[9]:http://lightspeed.sourceforge.net/
|
||||
[10]:http://www.physion.net/
|
||||
[10]:http://www.physion.net/
|
||||
|
||||
@ -0,0 +1,41 @@
|
||||
(翻译中 by runningwater)Search Multiple Words / String Pattern Using grep Command
|
||||
================================================================================
|
||||
How do I search multiple strings or words using the grep command? For example I'd like to search word1, word2, word3 and so on within /path/to/file. How do I force grep to search multiple words?
|
||||
|
||||
The [grep command supports regular expression][1] pattern. To search multiple words, use following syntax:
|
||||
|
||||
grep 'word1\|word2\|word3' /path/to/file
|
||||
|
||||
In this example, search warning, error, and critical words in a text log file called /var/log/messages, enter:
|
||||
|
||||
$ grep 'warning\|error\|critical' /var/log/messages
|
||||
|
||||
To just match words, add -w swith:
|
||||
|
||||
$ grep -w 'warning\|error\|critical' /var/log/messages
|
||||
|
||||
egrep command can skip the above syntax and use the following syntax:
|
||||
|
||||
$ egrep -w 'warning|error|critical' /var/log/messages
|
||||
|
||||
I recommend that you pass the -i (ignore case) and --color option as follows:
|
||||
|
||||
$ egrep -wi --color 'warning|error|critical' /var/log/messages
|
||||
|
||||
Sample outputs:
|
||||
|
||||
|
||||
|
||||
Fig.01: Linux / Unix egrep Command Search Multiple Words Demo Output
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/faq/searching-multiple-words-string-using-grep/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[runningwater](https://github.com/runningwater)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:http://www.cyberciti.biz/faq/grep-regular-expressions/
|
||||
@ -0,0 +1,33 @@
|
||||
Grep Count Lines If a String / Word Matches
|
||||
================================================================================
|
||||
How do I count lines if given word or string matches for each input file under Linux or UNIX operating systems?
|
||||
|
||||
You need to pass the -c or --count option to suppress normal output. It will display a count of matching lines for each input file:
|
||||
|
||||
$ grep -c vivek /etc/passwd
|
||||
|
||||
OR
|
||||
|
||||
$ grep -w -c vivek /etc/passwd
|
||||
|
||||
Sample outputs:
|
||||
|
||||
1
|
||||
|
||||
However, with the -v or --invert-match option it will count non-matching lines, enter:
|
||||
|
||||
$ grep -c vivek /etc/passwd
|
||||
|
||||
Sample outputs:
|
||||
|
||||
45
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/faq/grep-count-lines-if-a-string-word-matches/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
@ -0,0 +1,67 @@
|
||||
Grep From Files and Display the File Name
|
||||
================================================================================
|
||||
How do I grep from a number of files and display the file name only?
|
||||
|
||||
When there is more than one file to search it will display file name by default:
|
||||
|
||||
grep "word" filename
|
||||
grep root /etc/*
|
||||
|
||||
Sample outputs:
|
||||
|
||||
/etc/bash.bashrc: See "man sudo_root" for details.
|
||||
/etc/crontab:17 * * * * root cd / && run-parts --report /etc/cron.hourly
|
||||
/etc/crontab:25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
|
||||
/etc/crontab:47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
|
||||
/etc/crontab:52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
|
||||
/etc/group:root:x:0:
|
||||
grep: /etc/gshadow: Permission denied
|
||||
/etc/logrotate.conf: create 0664 root utmp
|
||||
/etc/logrotate.conf: create 0660 root utmp
|
||||
|
||||
The first name is file name (e.g., /etc/crontab, /etc/group). The -l option will only print filename if th
|
||||
|
||||
grep -l "string" filename
|
||||
grep -l root /etc/*
|
||||
|
||||
Sample outputs:
|
||||
|
||||
/etc/aliases
|
||||
/etc/arpwatch.conf
|
||||
grep: /etc/at.deny: Permission denied
|
||||
/etc/bash.bashrc
|
||||
/etc/bash_completion
|
||||
/etc/ca-certificates.conf
|
||||
/etc/crontab
|
||||
/etc/group
|
||||
|
||||
You can suppress normal output; instead print the name of each input file from **which no output would normally have been** printed:
|
||||
|
||||
grep -L "word" filename
|
||||
grep -L root /etc/*
|
||||
|
||||
Sample outputs:
|
||||
|
||||
/etc/apm
|
||||
/etc/apparmor
|
||||
/etc/apparmor.d
|
||||
/etc/apport
|
||||
/etc/apt
|
||||
/etc/avahi
|
||||
/etc/bash_completion.d
|
||||
/etc/bindresvport.blacklist
|
||||
/etc/blkid.conf
|
||||
/etc/bluetooth
|
||||
/etc/bogofilter.cf
|
||||
/etc/bonobo-activation
|
||||
/etc/brlapi.key
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/faq/grep-from-files-and-display-the-file-name/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
@ -0,0 +1,66 @@
|
||||
How To Find Files by Content Under UNIX
|
||||
================================================================================
|
||||
I had written lots of code in C for my school work and saved it as source code under /home/user/c/*.c and *.h. How do I find files by content such as string or words (function name such as main() under UNIX shell prompt?
|
||||
|
||||
You need to use the following tools:
|
||||
|
||||
[a] **grep command** : print lines matching a pattern.
|
||||
|
||||
[b] **find command**: search for files in a directory hierarchy.
|
||||
|
||||
### [grep Command To Find Files By][1] Content ###
|
||||
|
||||
Type the command as follows:
|
||||
|
||||
grep 'string' *.txt
|
||||
grep 'main(' *.c
|
||||
grep '#include<example.h>' *.c
|
||||
grep 'getChar*' *.c
|
||||
grep -i 'ultra' *.conf
|
||||
grep -iR 'ultra' *.conf
|
||||
|
||||
Where
|
||||
|
||||
- **-i** : Ignore case distinctions in both the PATTERN (match valid, VALID, ValID string) and the input files (math file.c FILE.c FILE.C filename).
|
||||
- **-R** : Read all files under each directory, recursively
|
||||
|
||||
### Highlighting searched patterns ###
|
||||
|
||||
You can highlight patterns easily while searching large number of files:
|
||||
|
||||
$ grep --color=auto -iR 'getChar();' *.c
|
||||
|
||||
### Displaying file names and line number for searched patterns ###
|
||||
|
||||
You may also need to display filenames and numbers:
|
||||
|
||||
$ grep --color=auto -iRnH 'getChar();' *.c
|
||||
|
||||
Where,
|
||||
|
||||
- **-n** : Prefix each line of output with the 1-based line number within its input file.
|
||||
- **-H** Print the file name for each match. This is the default when there is more than one file to search.
|
||||
|
||||
$grep --color=auto -nH 'DIR' *
|
||||
|
||||
Sample output:
|
||||
|
||||
|
||||
|
||||
Fig.01: grep command displaying searched pattern
|
||||
|
||||
You can also use find command:
|
||||
|
||||
$ find . -name "*.c" -print | xargs grep "main("
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/faq/unix-linux-finding-files-by-content/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:http://www.cyberciti.biz/faq/howto-search-find-file-for-text-string/
|
||||
@ -0,0 +1,151 @@
|
||||
Linux / UNIX View Only Configuration File Directives ( Uncommented Lines of a Config File )
|
||||
================================================================================
|
||||
Most Linux and UNIX-like system configuration files are documented using comments, but some time I just need to see line of configuration text in a config file. How can I view just the uncommented configuration file directives from squid.conf or httpd.conf file? How can I strip out comments and blank lines on a Linux or Unix-like systems?
|
||||
|
||||
To view just the uncommented lines of text in a config file use the grep, sed, awk, perl or any other text processing utility provided by UNIX / BSD / OS X / Linux operating systems.
|
||||
|
||||
### grep command example to strip out command ###
|
||||
|
||||
You can use the gerp command as follows:
|
||||
|
||||
$ grep -v "^#" /path/to/config/file
|
||||
$ grep -v "^#" /etc/apache2/apache2.conf
|
||||
|
||||
Sample outputs:
|
||||
|
||||
ServerRoot "/etc/apache2"
|
||||
|
||||
LockFile /var/lock/apache2/accept.lock
|
||||
|
||||
PidFile ${APACHE_PID_FILE}
|
||||
|
||||
Timeout 300
|
||||
|
||||
KeepAlive On
|
||||
|
||||
MaxKeepAliveRequests 100
|
||||
|
||||
KeepAliveTimeout 15
|
||||
|
||||
|
||||
<IfModule mpm_prefork_module>
|
||||
StartServers 5
|
||||
MinSpareServers 5
|
||||
MaxSpareServers 10
|
||||
MaxClients 150
|
||||
MaxRequestsPerChild 0
|
||||
</IfModule>
|
||||
|
||||
<IfModule mpm_worker_module>
|
||||
StartServers 2
|
||||
MinSpareThreads 25
|
||||
MaxSpareThreads 75
|
||||
ThreadLimit 64
|
||||
ThreadsPerChild 25
|
||||
MaxClients 150
|
||||
MaxRequestsPerChild 0
|
||||
</IfModule>
|
||||
|
||||
<IfModule mpm_event_module>
|
||||
StartServers 2
|
||||
MaxClients 150
|
||||
MinSpareThreads 25
|
||||
MaxSpareThreads 75
|
||||
ThreadLimit 64
|
||||
ThreadsPerChild 25
|
||||
MaxRequestsPerChild 0
|
||||
</IfModule>
|
||||
|
||||
User ${APACHE_RUN_USER}
|
||||
Group ${APACHE_RUN_GROUP}
|
||||
|
||||
|
||||
AccessFileName .htaccess
|
||||
|
||||
<Files ~ "^\.ht">
|
||||
Order allow,deny
|
||||
Deny from all
|
||||
Satisfy all
|
||||
</Files>
|
||||
|
||||
DefaultType text/plain
|
||||
|
||||
|
||||
HostnameLookups Off
|
||||
|
||||
ErrorLog /var/log/apache2/error.log
|
||||
|
||||
LogLevel warn
|
||||
|
||||
Include /etc/apache2/mods-enabled/*.load
|
||||
Include /etc/apache2/mods-enabled/*.conf
|
||||
|
||||
Include /etc/apache2/httpd.conf
|
||||
|
||||
Include /etc/apache2/ports.conf
|
||||
|
||||
LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
|
||||
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
|
||||
LogFormat "%h %l %u %t \"%r\" %>s %O" common
|
||||
LogFormat "%{Referer}i -> %U" referer
|
||||
LogFormat "%{User-agent}i" agent
|
||||
|
||||
CustomLog /var/log/apache2/other_vhosts_access.log vhost_combined
|
||||
|
||||
|
||||
|
||||
Include /etc/apache2/conf.d/
|
||||
|
||||
Include /etc/apache2/sites-enabled/
|
||||
|
||||
To suppress blank lines use [egrep command][1], run:
|
||||
|
||||
egrep -v "^#|^$" /etc/apache2/apache2.conf
|
||||
## or pass it to the page such as more or less ##
|
||||
egrep -v "^#|^$" /etc/apache2/apache2.conf | less
|
||||
|
||||
## Bash function ######################################
|
||||
## or create function or alias and use it as follows ##
|
||||
## viewconfig /etc/squid/squid.conf ##
|
||||
#######################################################
|
||||
viewconfig(){
|
||||
local f="$1"
|
||||
[ -f "$1" ] && command egrep -v "^#|^$" "$f" || echo "Error $1 file not found."
|
||||
}
|
||||
|
||||
Sample output:
|
||||
|
||||
|
||||
|
||||
Fig.01: Unix/Linux Egrep Strip Out Comments Blank Lines
|
||||
|
||||
### Understanding grep/egrep command line options ###
|
||||
|
||||
The -v option invert the sense of matching, to select non-matching lines. This option should work under all posix based systems. The regex ^$ matches and removes all blank lines and ^# matches and removes all comments that starts with a "#".
|
||||
|
||||
### sed Command example ###
|
||||
|
||||
GNU / sed command can be used as follows:
|
||||
|
||||
$ sed '/ *#/d; /^ *$/d' /path/to/file
|
||||
$ sed '/ *#/d; /^ *$/d' /etc/apache2/apache2.conf
|
||||
|
||||
GNU or BSD sed can update your config file too. The syntax is as follows to edit files in-place, saving backups with the specified extension such as .bak:
|
||||
|
||||
sed -i'.bak.2015.12.27' '/ *#/d; /^ *$/d' /etc/apache2/apache2.conf
|
||||
|
||||
For more info see man pages - [grep(1)][2], [sed(1)][3]
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: http://www.cyberciti.biz/faq/shell-display-uncommented-lines-only/
|
||||
|
||||
作者：Vivek Gite
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[1]:http://www.cyberciti.biz/faq/grep-regular-expressions/
|
||||
[2]:http://www.manpager.com/linux/man1/grep.1.html
|
||||
[3]:http://www.manpager.com/linux/man1/sed.1.html
|
||||
Some files were not shown because too many files have changed in this diff Show More
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Reference in New Issue
Block a user