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bd0971a747
@ -1,8 +1,8 @@
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[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: reviewer: (wxy)
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[#]: publisher: (wxy)
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[#]: url: (https://linux.cn/article-10830-1.html)
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[#]: subject: (How to use autofs to mount NFS shares)
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[#]: via: (https://opensource.com/article/18/6/using-autofs-mount-nfs-shares)
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[#]: author: (Alan Formy-Duval https://opensource.com/users/alanfdoss)
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@ -10,9 +10,11 @@
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如何使用 autofs 挂载 NFS 共享
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======
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> 给你的网络文件系统（NFS）配置一个基本的自动挂载功能。
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大多数 Linux 文件系统在引导时挂载，并在系统运行时保持挂载状态。对于已在 `fstab` 中配置的任何远程文件系统也是如此。但是，有时你可能希望仅按需挂载远程文件系统 - 例如，通过减少网络带宽使用来提高性能，或出于安全原因隐藏或混淆某些目录。[autofs][1] 软件包提供此功能。在本文中，我将介绍如何配置基本的自动挂载。
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大多数 Linux 文件系统在引导时挂载，并在系统运行时保持挂载状态。对于已在 `fstab` 中配置的任何远程文件系统也是如此。但是，有时你可能希望仅按需挂载远程文件系统。例如，通过减少网络带宽使用来提高性能，或出于安全原因隐藏或混淆某些目录。[autofs][1] 软件包提供此功能。在本文中，我将介绍如何配置基本的自动挂载。
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首先做点假设：假设有台 NFS 服务器 `tree.mydatacenter.net` 已经启动并运行。另外假设一个名为 `ourfiles` 的数据目录还有供 Carl 和 Sarah 使用的用户目录，它们都由服务器共享。
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@ -20,106 +22,88 @@
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```
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alan@workstation1:~$ sudo getent passwd carl sarah
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[sudo] password for alan:
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carl:x:1020:1020:Carl,,,:/home/carl:/bin/bash
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sarah:x:1021:1021:Sarah,,,:/home/sarah:/bin/bash
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alan@workstation1:~$ sudo getent hosts
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127.0.0.1 localhost
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127.0.1.1 workstation1.mydatacenter.net workstation1
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10.10.1.5 tree.mydatacenter.net tree
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127.0.0.1 localhost
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127.0.1.1 workstation1.mydatacenter.net workstation1
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10.10.1.5 tree.mydatacenter.net tree
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```
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如你所见，客户端工作站和 NFS 服务器都在 `hosts` 中配置。我假设一个基本的家庭甚至小型办公室网络，可能缺乏适合的内部域名服务（即 DNS）。
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如你所见，客户端工作站和 NFS 服务器都在 `hosts` 文件中配置。我假设这是一个基本的家庭甚至小型办公室网络，可能缺乏适合的内部域名服务（即 DNS）。
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### 安装软件包
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你只需要安装两个软件包：用于 NFS 客户端的 `nfs-common` 和提供自动挂载的 `autofs`。
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```
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alan@workstation1:~$ sudo apt-get install nfs-common autofs
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```
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你可以验证 autofs 是否已放在 `etc` 目录中：
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你可以验证 autofs 相关的文件是否已放在 `/etc` 目录中：
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```
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alan@workstation1:~$ cd /etc; ll auto*
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-rw-r--r-- 1 root root 12596 Nov 19 2015 autofs.conf
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-rw-r--r-- 1 root root 857 Mar 10 2017 auto.master
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-rw-r--r-- 1 root root 708 Jul 6 2017 auto.misc
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-rwxr-xr-x 1 root root 1039 Nov 19 2015 auto.net*
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-rwxr-xr-x 1 root root 2191 Nov 19 2015 auto.smb*
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-rw-r--r-- 1 root root 12596 Nov 19 2015 autofs.conf
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-rw-r--r-- 1 root root 857 Mar 10 2017 auto.master
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-rw-r--r-- 1 root root 708 Jul 6 2017 auto.misc
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-rwxr-xr-x 1 root root 1039 Nov 19 2015 auto.net*
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-rwxr-xr-x 1 root root 2191 Nov 19 2015 auto.smb*
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alan@workstation1:/etc$
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```
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### 配置 autofs
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现在你需要编辑其中几个文件并添加 `auto.home` 文件。首先，将以下两行添加到文件 `auto.master` 中：
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```
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/mnt/tree /etc/auto.misc
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/home/tree /etc/auto.home
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```
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每行以挂载 NFS 共享的目录开头。继续创建这些目录：
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|
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```
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alan@workstation1:/etc$ sudo mkdir /mnt/tree /home/tree
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|
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```
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接下来，将以下行添加到文件 `auto.misc`：
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```
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ourfiles -fstype=nfs tree:/share/ourfiles
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```
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该行表示 autofs 将挂载 `auto.master` 文件中匹配 `auto.misc` 的 `ourfiles` 共享。如上所示，这些文件将在 `/mnt/tree/ourfiles` 目录中。
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|
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第三步，使用以下行创建文件 `auto.home`：
|
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|
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```
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* -fstype=nfs tree:/home/&
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```
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该行表示 autofs 将挂载 `auto.master` 文件中匹配 `auto.home` 的用户共享。在这种情况下，Carl 和 Sarah 的文件将分别在目录 `/home/tree/carl` 或 `/home/tree/sarah`中。星号（称为通配符）使每个用户的共享可以在登录时自动挂载。＆ 符号也可以作为表示服务器端用户目录的通配符。它们的主目录会相应地根据 `passwd` 文件映射。如果你更喜欢本地主目录，则无需执行此操作。相反，用户可以将其用作特定文件的简单远程存储。
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该行表示 autofs 将挂载 `auto.master` 文件中匹配 `auto.home` 的用户共享。在这种情况下，Carl 和 Sarah 的文件将分别在目录 `/home/tree/carl` 或 `/home/tree/sarah`中。星号 `*`（称为通配符）使每个用户的共享可以在登录时自动挂载。`＆` 符号也可以作为表示服务器端用户目录的通配符。它们的主目录会相应地根据 `passwd` 文件映射。如果你更喜欢本地主目录，则无需执行此操作。相反，用户可以将其用作特定文件的简单远程存储。
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最后，重启 `autofs` 守护进程，以便识别并加载这些配置的更改。
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|
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```
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alan@workstation1:/etc$ sudo service autofs restart
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```
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### 测试 autofs
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如果更改文件 `auto.master` 中的列出目录并运行 `ls` 命令，那么不会立即看到任何内容。例如，`(cd)` 到目录 `/mnt/tree`。首先，`ls` 的输出不会显示任何内容，但在运行 `cd ourfiles` 之后，将自动挂载 `ourfiles` 共享目录。 `cd` 命令也将被执行，你将进入新挂载的目录中。
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如果更改文件 `auto.master` 中的列出目录，并运行 `ls` 命令，那么不会立即看到任何内容。例如，切换到目录 `/mnt/tree`。首先，`ls` 的输出不会显示任何内容，但在运行 `cd ourfiles` 之后，将自动挂载 `ourfiles` 共享目录。 `cd` 命令也将被执行，你将进入新挂载的目录中。
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```
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carl@workstation1:~$ cd /mnt/tree
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carl@workstation1:/mnt/tree$ ls
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carl@workstation1:/mnt/tree$ cd ourfiles
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carl@workstation1:/mnt/tree/ourfiles$
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```
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为了进一步确认正常工作，`mount` 命令会显示已挂载共享的细节
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为了进一步确认正常工作，`mount` 命令会显示已挂载共享的细节。
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```
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carl@workstation1:~$ mount
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@ -127,7 +111,7 @@ tree:/mnt/share/ourfiles on /mnt/tree/ourfiles type nfs4 (rw,relatime,vers=4.0,r
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```
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对于Carl和Sarah，`/home/tree` 目录工作方式相同。
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对于 Carl 和 Sarah，`/home/tree` 目录工作方式相同。
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我发现在我的文件管理器中添加这些目录的书签很有用，可以用来快速访问。
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@ -138,7 +122,7 @@ via: https://opensource.com/article/18/6/using-autofs-mount-nfs-shares
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作者：[Alan Formy-Duval][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[geekpi](https://github.com/geekpi)
|
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校对：[校对者ID](https://github.com/校对者ID)
|
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校对：[wxy](https://github.com/wxy)
|
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|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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@ -1,48 +1,47 @@
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[#]: collector: "lujun9972"
|
||||
[#]: translator: "zgj1024 "
|
||||
[#]: reviewer: " "
|
||||
[#]: publisher: " "
|
||||
[#]: url: " "
|
||||
[#]: translator: "zgj1024"
|
||||
[#]: reviewer: "wxy"
|
||||
[#]: publisher: "wxy"
|
||||
[#]: url: "https://linux.cn/article-10834-1.html"
|
||||
[#]: subject: "Why DevOps is the most important tech strategy today"
|
||||
[#]: via: "https://opensource.com/article/19/3/devops-most-important-tech-strategy"
|
||||
[#]: author: "Kelly AlbrechtWilly-Peter Schaub https://opensource.com/users/ksalbrecht/users/brentaaronreed/users/wpschaub/users/wpschaub/users/ksalbrecht"
|
||||
[#]: author: "Kelly Albrecht https://opensource.com/users/ksalbrecht"
|
||||
|
||||
为何 DevOps 是如今最重要的技术策略
|
||||
======
|
||||
消除一些关于 DevOps 的疑惑
|
||||
|
||||
> 消除一些关于 DevOps 的疑惑。
|
||||
|
||||
![CICD with gears][1]
|
||||
|
||||
很多人初学 [DevOps][2] 时，看到它其中一个结果就问这个是如何得来的。其实理解这部分 Devops 的怎样实现并不重要，重要的是——理解（使用） DevOps 策略的原因——这是做一个行业的领导者还是追随者的差别。
|
||||
|
||||
你可能会听过些 Devops 的难以置信的成果，例如生产环境非常有弹性，“混世猴子”（[Chaos Monkey][3]）程序运行时，将周围的连接随机切断，每天仍可以处理数千个版本。这是令人印象深刻的，但就其本身而言，这是一个 DevOps 的无力案例，本质上会被一个[反例][4]困扰：DevOps 环境有弹性是因为没有观察到严重的故障。。。还没有。
|
||||
你可能会听过些 Devops 的难以置信的成果，例如生产环境非常有弹性，就算是有个“<ruby>[癫狂的猴子][3]<rt>Chaos Monkey</rt></ruby>）跳来跳去将不知道哪个插头随便拔下，每天仍可以处理数千个发布。这是令人印象深刻的，但就其本身而言，这是一个 DevOps 的证据不足的案例，其本质上会被一个[反例][4]困扰：DevOps 环境有弹性是因为严重的故障还没有被观测到。
|
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|
||||
有很多关于 DevOps 的疑惑，并且许多人还在尝试弄清楚它的意义。下面是来自我 LinkedIn Feed 中的某个人的一个案例：
|
||||
|
||||
> 最近我参加一些 #DevOps 的交流会，那里一些演讲人好像在倡导 #敏捷开发是 DevOps 的子集。不知为何，我的理解洽洽相反。
|
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> 最近我参加一些 #DevOps 的交流会，那里一些演讲人好像在倡导 #敏捷开发是 DevOps 的子集。不知为何，我的理解恰恰相反。
|
||||
>
|
||||
> 能听一下你们的想法吗？你认为敏捷开发和 DevOps 之间是什么关系呢？
|
||||
>
|
||||
> 1. DevOps 是敏捷开发的子集
|
||||
> 2. 敏捷开发 是 DevOps 的子集
|
||||
> 2. 敏捷开发是 DevOps 的子集
|
||||
> 3. DevOps 是敏捷开发的扩展，从敏捷开发结束的地方开始
|
||||
> 4. DevOps 是敏捷开发的新版本
|
||||
>
|
||||
|
||||
科技行业的专业人士在那篇 LinkedIn 的帖子上达标各样的答案，你会怎样回复呢？
|
||||
科技行业的专业人士在那篇 LinkedIn 的帖子上表达了各种各样的答案，你会怎样回复呢？
|
||||
|
||||
### DevOps源于精益和敏捷
|
||||
### DevOps 源于精益和敏捷
|
||||
|
||||
如果我们从亨利福特的战略和丰田生产系统对福特车型的改进（的历史）开始， DevOps 就更有意义了。精益制造就诞生在那段历史中，人们对精益制作进行了良好的研究。James P. Womack 和 Daniel T. Jones 将精益思维（[Lean Thinking][5]）提炼为五个原则：
|
||||
|
||||
如果我们从亨利福特的战略和丰田生产系统对福特车型的改进（的历史）开始， DevOps 就更有意义了。精益制造就诞生在那段历史中，人们对精益制作进行了良好的研究。James P. Womack 和 Daniel T. Jones 将精益思维（ [Lean Thinking][5]）提炼为五个原则：
|
||||
1. 指明客户所需的价值
|
||||
2. 确定提供该价值的每个产品的价值流，并对当前提供该价值所需的所有浪费步骤提起挑战
|
||||
3. 使产品通过剩余的增值步骤持续流动
|
||||
4. 在可以连续流动的所有步骤之间引入拉力
|
||||
5. 管理要尽善尽美，以便为客户服务所需的步骤数量和时间以及信息量持续下降
|
||||
|
||||
|
||||
Lean seeks to continuously remove waste and increase the flow of value to the customer. This is easily recognizable and understood through a core tenet of lean: single piece flow. We can do a number of activities to learn why moving single pieces at a time is magnitudes faster than batches of many pieces; the [Penny Game][6] and the [Airplane Game][7] are two of them. In the Penny Game, if a batch of 20 pennies takes two minutes to get to the customer, they get the whole batch after waiting two minutes. If you move one penny at a time, the customer gets the first penny in about five seconds and continues getting pennies until the 20th penny arrives approximately 25 seconds later.
|
||||
|
||||
精益致力于持续消除浪费并增加客户的价值流动。这很容易识别并明白精益的核心原则：单一流。我们可以做一些游戏去了解为何同一时间移动单个比批量移动要快得多。其中的两个游戏是[硬币游戏][6]和[飞机游戏][7]。在硬币游戏中，如果一批 20 个硬币到顾客手中要用 2 分钟，顾客等 2 分钟后能拿到整批硬币。如果一次只移动一个硬币，顾客会在 5 秒内得到第一枚硬币，并会持续获得硬币，直到在大约 25 秒后第 20 个硬币到达。（译者注：有相关的视频的）
|
||||
精益致力于持续消除浪费并增加客户的价值流动。这很容易识别并明白精益的核心原则：单一流。我们可以做一些游戏去了解为何同一时间移动单个比批量移动要快得多。其中的两个游戏是[硬币游戏][6]和[飞机游戏][7]。在硬币游戏中，如果一批 20 个硬币到顾客手中要用 2 分钟，顾客等 2 分钟后能拿到整批硬币。如果一次只移动一个硬币，顾客会在 5 秒内得到第一枚硬币，并会持续获得硬币，直到在大约 25 秒后第 20 个硬币到达。（LCTT 译注：有相关的视频的）
|
||||
|
||||
这是巨大的不同，但是不是生活中的所有事都像硬币游戏那样简单并可预测的。这就是敏捷的出现的原因。我们当然看到了高效绩敏捷团队的精益原则，但这些团队需要的不仅仅是精益去做他们要做的事。
|
||||
|
||||
@ -52,13 +51,13 @@ Lean seeks to continuously remove waste and increase the flow of value to the cu
|
||||
|
||||
### 最佳批量大小
|
||||
|
||||
要了解 DevOps 在软件开发中的请强大功能，这会帮助我们理解批处理大小的经济学。请考虑以下来自Donald Reinertsen 的[产品开发流程原则][8]的U曲线优化示例：
|
||||
要了解 DevOps 在软件开发中的强大功能，这会帮助我们理解批处理大小的经济学。请考虑以下来自Donald Reinertsen 的[产品开发流程原则][8]的U曲线优化示例：
|
||||
|
||||
![U-curve optimization illustration of optimal batch size][9]
|
||||
|
||||
这可以类比杂货店购物来解释。假设你需要买一些鸡蛋，而你住的地方离商店只有 30 分的路程。买一个鸡蛋（图种最左边）意味着每次要花 30 分钟的路程，这就是你的_交易成本_。_持有成本_可能是鸡蛋变质和在你的冰箱中持续地占用空间。_总成本_是_交易成本_加上你的_持有成本_。这 U 型曲线解释了为什么对大部分来说，一次买一打鸡蛋是他们的_最佳批量大小_。如果你就住在商店的旁边，步行到那里不会花费你任何的时候，你可能每次只会买一小盒鸡蛋，以此来节省冰箱的空间并享受新鲜的鸡蛋。
|
||||
这可以类比杂货店购物来解释。假设你需要买一些鸡蛋，而你住的地方离商店只有 30 分钟的路程。买一个鸡蛋（图中最左边）意味着每次要花 30 分钟的路程，这就是你的*交易成本*。*持有成本*可能是鸡蛋变质和在你的冰箱中持续地占用空间。*总成本*是*交易成本*加上你的*持有成本*。这个 U 型曲线解释了为什么对大部分人来说，一次买一打鸡蛋是他们的*最佳批量大小*。如果你就住在商店的旁边，步行到那里不会花费你任何的时候，你可能每次只会买一小盒鸡蛋，以此来节省冰箱的空间并享受新鲜的鸡蛋。
|
||||
|
||||
这 U 型优化曲线可以说明为什么在成功敏捷转换中生产力会显著提高。考虑敏捷转换对组织决策的影响。在传统的分级组织中，决策权是集中的。这会导致较少的人做更大的决策。敏捷方法论会有效地降低组织决策中的交易成本，方法是将决策分散到最被人熟知的认识和信息的位置：跨越高度信任，自组织的敏捷团队。
|
||||
这 U 型优化曲线可以说明为什么在成功的敏捷转换中生产力会显著提高。考虑敏捷转换对组织决策的影响。在传统的分级组织中，决策权是集中的。这会导致较少的人做更大的决策。敏捷方法论会有效地降低组织决策中的交易成本，方法是将决策分散到最被人熟知的认识和信息的位置：跨越高度信任，自组织的敏捷团队。
|
||||
|
||||
下面的动画演示了降低事务成本后，最佳批量大小是如何向左移动。在更频繁地做出更快的决策方面，你不能低估组织的价值。
|
||||
|
||||
@ -66,22 +65,21 @@ Lean seeks to continuously remove waste and increase the flow of value to the cu
|
||||
|
||||
### DevOps 适合哪些地方
|
||||
|
||||
自动化是 DevOps 最知名的事情之一。前面的插图非常详细地展示了自动化的价值。通过自动化，我们将交易成本降低到接近零，实质上是免费进行测试和部署。这使我们可以利用越来越小的批量工作。较小批量的工作更容易理解、提交、测试、审查和知道何时能完成。这些较小的批量大小也包含较少的差异和风险，使其更易于部署，如果出现问题，可以进行故障排除和恢复。通过自动化与扎实的敏捷实践相结合，我们可以使我们的功能开发非常接近单件流程，从而快速，持续地为客户提供价值。
|
||||
自动化是 DevOps 最知名的事情之一。前面的插图非常详细地展示了自动化的价值。通过自动化，我们将交易成本降低到接近于零，实质上是可以免费进行测试和部署。这使我们可以利用越来越小的批量工作。较小批量的工作更容易理解、提交、测试、审查和知道何时能完成。这些较小的批量大小也包含较少的差异和风险，使其更易于部署，如果出现问题，可以进行故障排除和恢复。通过自动化与扎实的敏捷实践相结合，我们可以使我们的功能开发非常接近单件流程，从而快速、持续地为客户提供价值。
|
||||
|
||||
更传统地说，DevOps 被理解为一种打破开发团队和运营团队之间混乱局面的方法。在这个模型中，开发团队开发新的功能，而运营团队则保持系统的稳定和平稳运行。摩擦的发生是因为开发过程中的新功能将更改引入到系统中，从而增加了停机的风险，运营团队并不认为要对此负责，但无论如何都必须处理这一问题。DevOps 不仅仅尝试让人们一起工作，更重要的是尝试在复杂的环境中安全地进行更频繁的更改。
|
||||
|
||||
我们可以向 [Ron Westrum][11] 寻求有关在复杂组织中实现安全性的研究。在研究为什么有些组织比其他组织更安全时，他发现组织的文化可以预测其安全性。他确定了三种文化：病态，官僚主义的和生产式的。他发现病理的可以预测安全性较低，而生产式文化被预测为更安全（例如，在他的主要研究领域中，飞机坠毁或意外住院死亡的数量要少得多）。
|
||||
我们可以看看 [Ron Westrum][11] 在有关复杂组织中实现安全性的研究。在研究为什么有些组织比其他组织更安全时，他发现组织的文化可以预测其安全性。他确定了三种文化：病态的、官僚主义的和生产式的。他发现病态的可以预测其安全性较低，而生产式文化被预测为更安全（例如，在他的主要研究领域中，飞机坠毁或意外住院死亡的数量要少得多）。
|
||||
|
||||
![Three types of culture identified by Ron Westrum][12]
|
||||
|
||||
高效的 DevOps 团队通过精益和敏捷的实践实现了一种生成性文化，这表明速度和安全性是互补的，或者说是同一个问题的两个方面。通过将决策和功能的最佳批量大小减少到非常小，DevOps 实现了更快的信息流和价值，同时消除了浪费并降低了风险。
|
||||
|
||||
与 Westrum的研究一致，在提高安全性和可靠性的同时，变化也很容易发生。。当一个敏捷的 DevOps 团队被信任做出自己的决定时，我们将获得 DevOps 目前最为人所知的工具和技术：自动化和持续交付。通过这种自动化，交易成本比以往任何时候都进一步降低，并且实现了近乎单一的精益流程，每天创造数千个决策和发布的潜力，正如我们在高效绩的 DevOps 组织中看到的那样
|
||||
与 Westrum 的研究一致，在提高安全性和可靠性的同时，变化也很容易发生。当一个敏捷的 DevOps 团队被信任做出自己的决定时，我们将获得 DevOps 目前最为人所知的工具和技术：自动化和持续交付。通过这种自动化，交易成本比以往任何时候都进一步降低，并且实现了近乎单一的精益流程，每天创造数千个决策和发布的潜力，正如我们在高效绩的 DevOps 组织中看到的那样
|
||||
|
||||
### 流动、反馈、学习
|
||||
|
||||
DevOps 并不止于此。我们主要讨论了 DevOps 实现了革命性的流程，但通过类似的努力可以进一步放大精益和敏捷实践，从而实现更快的反馈循环和更快的学习。在[_DevOps手册_][13] 中，作者除了详细解释快速流程外， DevOps 如何在整个价值流中实现遥测，从而获得快速且持续的反馈。此外，利用[精益求精的突破][14]和scrum 的[回顾][15]，高效的 DevOps 团队将不断推动学习和持续改进深入到他们的组织的基础，实现软件产品开发行业的精益制造革命。
|
||||
|
||||
DevOps 并不止于此。我们主要讨论了 DevOps 实现了革命性的流程，但通过类似的努力可以进一步放大精益和敏捷实践，从而实现更快的反馈循环和更快的学习。在[DevOps手册][13] 中，作者除了详细解释快速流程外， DevOps 如何在整个价值流中实现遥测，从而获得快速且持续的反馈。此外，利用[精益求精的突破][14]和 scrum 的[回顾][15]，高效的 DevOps 团队将不断推动学习和持续改进深入到他们的组织的基础，实现软件产品开发行业的精益制造革命。
|
||||
|
||||
### 从 DevOps 评估开始
|
||||
|
||||
@ -91,18 +89,14 @@ DevOps 并不止于此。我们主要讨论了 DevOps 实现了革命性的流
|
||||
|
||||
在本文的[第二部分][16]中，我们将查看 Drupal 社区中 DevOps 调查的结果，并了解最有可能找到快速获胜的位置。
|
||||
|
||||
* * *
|
||||
|
||||
_Rob_ _Bayliss and Kelly Albrecht will present[DevOps: Why, How, and What][17] and host a follow-up [Birds of a][18]_ [_Feather_][18] _[discussion][18] at [DrupalCon 2019][19] in Seattle, April 8-12._
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/19/3/devops-most-important-tech-strategy
|
||||
|
||||
作者：[Kelly AlbrechtWilly-Peter Schaub][a]
|
||||
作者：[Kelly Albrecht][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[译者ID](https://github.com/zgj1024)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
译者：[zgj1024](https://github.com/zgj1024)
|
||||
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 +1,108 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: (wxy)
|
||||
[#]: publisher: (wxy)
|
||||
[#]: url: (https://linux.cn/article-10833-1.html)
|
||||
[#]: subject: (Getting started with Python's cryptography library)
|
||||
[#]: via: (https://opensource.com/article/19/4/cryptography-python)
|
||||
[#]: author: (Moshe Zadka https://opensource.com/users/moshez)
|
||||
|
||||
Python 的加密库入门
|
||||
======
|
||||
|
||||
> 加密你的数据并使其免受攻击者的攻击。
|
||||
|
||||
![lock on world map][1]
|
||||
|
||||
密码学俱乐部的第一条规则是：永远不要自己*发明*密码系统。密码学俱乐部的第二条规则是：永远不要自己*实现*密码系统：在现实世界中，在*实现*以及设计密码系统阶段都找到过许多漏洞。
|
||||
|
||||
Python 中的一个有用的基本加密库就叫做 [cryptography][2]。它既是一个“安全”方面的基础库，也是一个“危险”层。“危险”层需要更加小心和相关的知识，并且使用它很容易出现安全漏洞。在这篇介绍性文章中，我们不会涵盖“危险”层中的任何内容！
|
||||
|
||||
cryptography 库中最有用的高级安全功能是一种 Fernet 实现。Fernet 是一种遵循最佳实践的加密缓冲区的标准。它不适用于非常大的文件，如千兆字节以上的文件，因为它要求你一次加载要加密或解密的内容到内存缓冲区中。
|
||||
|
||||
Fernet 支持<ruby>对称<rt>symmetric</rt></ruby>（即<ruby>密钥<rt>secret key</rt></ruby>）加密方式*：加密和解密使用相同的密钥，因此必须保持安全。
|
||||
|
||||
生成密钥很简单：
|
||||
|
||||
```
|
||||
>>> k = fernet.Fernet.generate_key()
|
||||
>>> type(k)
|
||||
<class 'bytes'>
|
||||
```
|
||||
|
||||
这些字节可以写入有适当权限的文件，最好是在安全的机器上。
|
||||
|
||||
有了密钥后，加密也很容易：
|
||||
|
||||
```
|
||||
>>> frn = fernet.Fernet(k)
|
||||
>>> encrypted = frn.encrypt(b"x marks the spot")
|
||||
>>> encrypted[:10]
|
||||
b'gAAAAABb1'
|
||||
```
|
||||
|
||||
如果在你的机器上加密，你会看到略微不同的值。不仅因为（我希望）你生成了和我不同的密钥，而且因为 Fernet 将要加密的值与一些随机生成的缓冲区连接起来。这是我之前提到的“最佳实践”之一：它将阻止对手分辨哪些加密值是相同的，这有时是攻击的重要部分。
|
||||
|
||||
解密同样简单：
|
||||
|
||||
```
|
||||
>>> frn = fernet.Fernet(k)
|
||||
>>> frn.decrypt(encrypted)
|
||||
b'x marks the spot'
|
||||
```
|
||||
|
||||
请注意，这仅加密和解密*字节串*。为了加密和解密*文本串*，通常需要对它们使用 [UTF-8][3] 进行编码和解码。
|
||||
|
||||
20 世纪中期密码学最有趣的进展之一是<ruby>公钥<rt>public key</rt></ruby>加密。它可以在发布加密密钥的同时而让*解密密钥*保持保密。例如，它可用于保存服务器使用的 API 密钥：服务器是唯一可以访问解密密钥的一方，但是任何人都可以保存公共加密密钥。
|
||||
|
||||
虽然 cryptography 没有任何支持公钥加密的*安全*功能，但 [PyNaCl][4] 库有。PyNaCl 封装并提供了一些很好的方法来使用 Daniel J. Bernstein 发明的 [NaCl][5] 加密系统。
|
||||
|
||||
NaCl 始终同时<ruby>加密<rt>encrypt</rt></ruby>和<ruby>签名<rt>sign</rt></ruby>或者同时<ruby>解密<rt>decrypt</rt></ruby>和<ruby>验证签名<rt>verify signature</rt></ruby>。这是一种防止<ruby>基于可伸缩性<rt>malleability-based</rt></ruby>的攻击的方法，其中攻击者会修改加密值。
|
||||
|
||||
加密是使用公钥完成的，而签名是使用密钥完成的：
|
||||
|
||||
```
|
||||
>>> from nacl.public import PrivateKey, PublicKey, Box
|
||||
>>> source = PrivateKey.generate()
|
||||
>>> with open("target.pubkey", "rb") as fpin:
|
||||
... target_public_key = PublicKey(fpin.read())
|
||||
>>> enc_box = Box(source, target_public_key)
|
||||
>>> result = enc_box.encrypt(b"x marks the spot")
|
||||
>>> result[:4]
|
||||
b'\xe2\x1c0\xa4'
|
||||
```
|
||||
|
||||
解密颠倒了角色：它需要私钥进行解密，需要公钥验证签名：
|
||||
|
||||
```
|
||||
>>> from nacl.public import PrivateKey, PublicKey, Box
|
||||
>>> with open("source.pubkey", "rb") as fpin:
|
||||
... source_public_key = PublicKey(fpin.read())
|
||||
>>> with open("target.private_key", "rb") as fpin:
|
||||
... target = PrivateKey(fpin.read())
|
||||
>>> dec_box = Box(target, source_public_key)
|
||||
>>> dec_box.decrypt(result)
|
||||
b'x marks the spot'
|
||||
```
|
||||
|
||||
最后，[PocketProtector][6] 库构建在 PyNaCl 之上，包含完整的密钥管理方案。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/19/4/cryptography-python
|
||||
|
||||
作者：[Moshe Zadka][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[geekpi](https://github.com/geekpi)
|
||||
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://opensource.com/users/moshez
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/security-lock-cloud-safe.png?itok=yj2TFPzq (lock on world map)
|
||||
[2]: https://cryptography.io/en/latest/
|
||||
[3]: https://en.wikipedia.org/wiki/UTF-8
|
||||
[4]: https://pynacl.readthedocs.io/en/stable/
|
||||
[5]: https://nacl.cr.yp.to/
|
||||
[6]: https://github.com/SimpleLegal/pocket_protector/blob/master/USER_GUIDE.md
|
||||
@ -0,0 +1,111 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: (wxy)
|
||||
[#]: publisher: (wxy)
|
||||
[#]: url: (https://linux.cn/article-10837-1.html)
|
||||
[#]: subject: (apt-clone : Backup Installed Packages And Restore Those On Fresh Ubuntu System)
|
||||
[#]: via: (https://www.2daygeek.com/apt-clone-backup-installed-packages-and-restore-them-on-fresh-ubuntu-system/)
|
||||
[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
|
||||
|
||||
apt-clone：备份已安装的软件包并在新的 Ubuntu 系统上恢复它们
|
||||
======
|
||||
|
||||
当我们在基于 Ubuntu/Debian 的系统上使用 `apt-clone`，包安装会变得更加容易。如果你需要在少量系统上安装相同的软件包时，`apt-clone` 会适合你。
|
||||
|
||||
如果你想在每个系统上手动构建和安装必要的软件包，这是一个耗时的过程。它可以通过多种方式实现，Linux 中有许多程序可用。我们过去曾写过一篇关于 [Aptik][1] 的文章。它是能让 Ubuntu 用户备份和恢复系统设置和数据的程序之一。
|
||||
|
||||
### 什么是 apt-clone？
|
||||
|
||||
[apt-clone][2] 能让你为 Debian/Ubuntu 系统创建所有已安装软件包的备份，这些软件包可以在新安装的系统（或容器）或目录中恢复。
|
||||
|
||||
该备份可以在相同操作系统版本和架构的多个系统上还原。
|
||||
|
||||
### 如何安装 apt-clone？
|
||||
|
||||
`apt-clone` 包可以在 Ubuntu/Debian 的官方仓库中找到，所以，使用 [apt 包管理器][3] 或 [apt-get 包管理器][4] 来安装它。
|
||||
|
||||
使用 `apt` 包管理器安装 `apt-clone`。
|
||||
|
||||
```
|
||||
$ sudo apt install apt-clone
|
||||
```
|
||||
|
||||
使用 `apt-get` 包管理器安装 `apt-clone`。
|
||||
|
||||
```
|
||||
$ sudo apt-get install apt-clone
|
||||
```
|
||||
|
||||
### 如何使用 apt-clone 备份已安装的软件包？
|
||||
|
||||
成功安装 `apt-clone` 之后。只需提供一个保存备份文件的位置。我们将在 `/backup` 目录下保存已安装的软件包备份。
|
||||
|
||||
`apt-clone` 会将已安装的软件包列表保存到 `apt-clone-state-Ubuntu18.2daygeek.com.tar.gz` 中。
|
||||
|
||||
```
|
||||
$ sudo apt-clone clone /backup
|
||||
```
|
||||
|
||||
我们同样可以通过运行 `ls` 命令来检查。
|
||||
|
||||
```
|
||||
$ ls -lh /backup/
|
||||
total 32K
|
||||
-rw-r--r-- 1 root root 29K Apr 20 19:06 apt-clone-state-Ubuntu18.2daygeek.com.tar.gz
|
||||
```
|
||||
|
||||
运行以下命令，查看备份文件的详细信息。
|
||||
|
||||
```
|
||||
$ apt-clone info /backup/apt-clone-state-Ubuntu18.2daygeek.com.tar.gz
|
||||
Hostname: Ubuntu18.2daygeek.com
|
||||
Arch: amd64
|
||||
Distro: bionic
|
||||
Meta: libunity-scopes-json-def-desktop, ubuntu-desktop
|
||||
Installed: 1792 pkgs (194 automatic)
|
||||
Date: Sat Apr 20 19:06:43 2019
|
||||
```
|
||||
|
||||
根据上面的输出，备份文件中总共有 1792 个包。
|
||||
|
||||
### 如何恢复使用 apt-clone 进行备份的软件包？
|
||||
|
||||
你可以使用任何远程复制程序来复制远程服务器上的文件。
|
||||
|
||||
```
|
||||
$ scp /backup/apt-clone-state-ubunt-18-04.tar.gz Destination-Server:/opt
|
||||
```
|
||||
|
||||
复制完成后，使用 `apt-clone` 执行还原。
|
||||
|
||||
使用以下命令进行还原。
|
||||
|
||||
```
|
||||
$ sudo apt-clone restore /opt/apt-clone-state-Ubuntu18.2daygeek.com.tar.gz
|
||||
```
|
||||
|
||||
请注意，还原将覆盖现有的 `/etc/apt/sources.list` 并安装/删除包。所以要小心。
|
||||
|
||||
如果你要将所有软件包还原到文件夹而不是实际还原，可以使用以下命令。
|
||||
|
||||
```
|
||||
$ sudo apt-clone restore /opt/apt-clone-state-Ubuntu18.2daygeek.com.tar.gz --destination /opt/oldubuntu
|
||||
```
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://www.2daygeek.com/apt-clone-backup-installed-packages-and-restore-them-on-fresh-ubuntu-system/
|
||||
|
||||
作者：[Magesh Maruthamuthu][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[geekpi](https://github.com/geekpi)
|
||||
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.2daygeek.com/author/magesh/
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://www.2daygeek.com/aptik-backup-restore-ppas-installed-apps-users-data/
|
||||
[2]: https://github.com/mvo5/apt-clone
|
||||
[3]: https://www.2daygeek.com/apt-command-examples-manage-packages-debian-ubuntu-systems/
|
||||
[4]: https://www.2daygeek.com/apt-get-apt-cache-command-examples-manage-packages-debian-ubuntu-systems/
|
||||
@ -1,111 +0,0 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (Getting started with Python's cryptography library)
|
||||
[#]: via: (https://opensource.com/article/19/4/cryptography-python)
|
||||
[#]: author: (Moshe Zadka https://opensource.com/users/moshez)
|
||||
|
||||
Getting started with Python's cryptography library
|
||||
======
|
||||
Encrypt your data and keep it safe from attackers.
|
||||
![lock on world map][1]
|
||||
|
||||
The first rule of cryptography club is: never _invent_ a cryptography system yourself. The second rule of cryptography club is: never _implement_ a cryptography system yourself: many real-world holes are found in the _implementation_ phase of a cryptosystem as well as in the design.
|
||||
|
||||
One useful library for cryptographic primitives in Python is called simply [**cryptography**][2]. It has both "secure" primitives as well as a "hazmat" layer. The "hazmat" layer requires care and knowledge of cryptography and it is easy to implement security holes using it. We will not cover anything in the "hazmat" layer in this introductory article!
|
||||
|
||||
The most useful high-level secure primitive in **cryptography** is the Fernet implementation. Fernet is a standard for encrypting buffers in a way that follows best-practices cryptography. It is not suitable for very big files—anything in the gigabyte range and above—since it requires you to load the whole buffer that you want to encrypt or decrypt into memory at once.
|
||||
|
||||
Fernet supports _symmetric_ , or _secret key_ , cryptography: the same key is used for encryption and decryption, and therefore must be kept safe.
|
||||
|
||||
Generating a key is easy:
|
||||
|
||||
|
||||
```
|
||||
>>> k = fernet.Fernet.generate_key()
|
||||
>>> type(k)
|
||||
<class 'bytes'>
|
||||
```
|
||||
|
||||
Those bytes can be written to a file with appropriate permissions, ideally on a secure machine.
|
||||
|
||||
Once you have key material, encrypting is easy as well:
|
||||
|
||||
|
||||
```
|
||||
>>> frn = fernet.Fernet(k)
|
||||
>>> encrypted = frn.encrypt(b"x marks the spot")
|
||||
>>> encrypted[:10]
|
||||
b'gAAAAABb1'
|
||||
```
|
||||
|
||||
You will get slightly different values if you encrypt on your machine. Not only because (I hope) you generated a different key from me, but because Fernet concatenates the value to be encrypted with some randomly generated buffer. This is one of the "best practices" I alluded to earlier: it will prevent an adversary from being able to tell which encrypted values are identical, which is sometimes an important part of an attack.
|
||||
|
||||
Decryption is equally simple:
|
||||
|
||||
|
||||
```
|
||||
>>> frn = fernet.Fernet(k)
|
||||
>>> frn.decrypt(encrypted)
|
||||
b'x marks the spot'
|
||||
```
|
||||
|
||||
Note that this only encrypts and decrypts _byte strings_. In order to encrypt and decrypt _text strings_ , they will need to be encoded and decoded, usually with [UTF-8][3].
|
||||
|
||||
One of the most interesting advances in cryptography in the mid-20th century was _public key_ cryptography. It allows the encryption key to be published while the _decryption key_ is kept secret. It can, for example, be used to store API keys to be used by a server: the server is the only thing with access to the decryption key, but anyone can add to the store by using the public encryption key.
|
||||
|
||||
While **cryptography** does not have any public key cryptographic _secure_ primitives, the [**PyNaCl**][4] library does. PyNaCl wraps and offers some nice ways to use the [**NaCl**][5] encryption system invented by Daniel J. Bernstein.
|
||||
|
||||
NaCl always _encrypts_ and _signs_ or _decrypts_ and _verifies signatures_ simultaneously. This is a way to prevent malleability-based attacks, where an adversary modifies the encrypted value.
|
||||
|
||||
Encryption is done with a public key, while signing is done with a secret key:
|
||||
|
||||
|
||||
```
|
||||
>>> from nacl.public import PrivateKey, PublicKey, Box
|
||||
>>> source = PrivateKey.generate()
|
||||
>>> with open("target.pubkey", "rb") as fpin:
|
||||
... target_public_key = PublicKey(fpin.read())
|
||||
>>> enc_box = Box(source, target_public_key)
|
||||
>>> result = enc_box.encrypt(b"x marks the spot")
|
||||
>>> result[:4]
|
||||
b'\xe2\x1c0\xa4'
|
||||
```
|
||||
|
||||
Decryption reverses the roles: it needs the private key for decryption and the public key to verify the signature:
|
||||
|
||||
|
||||
```
|
||||
>>> from nacl.public import PrivateKey, PublicKey, Box
|
||||
>>> with open("source.pubkey", "rb") as fpin:
|
||||
... source_public_key = PublicKey(fpin.read())
|
||||
>>> with open("target.private_key", "rb") as fpin:
|
||||
... target = PrivateKey(fpin.read())
|
||||
>>> dec_box = Box(target, source_public_key)
|
||||
>>> dec_box.decrypt(result)
|
||||
b'x marks the spot'
|
||||
```
|
||||
|
||||
The [**PocketProtector**][6] library builds on top of PyNaCl and contains a complete secrets management solution.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/19/4/cryptography-python
|
||||
|
||||
作者：[Moshe Zadka (Community Moderator)][a]
|
||||
选题：[lujun9972][b]
|
||||
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/moshez
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/security-lock-cloud-safe.png?itok=yj2TFPzq (lock on world map)
|
||||
[2]: https://cryptography.io/en/latest/
|
||||
[3]: https://en.wikipedia.org/wiki/UTF-8
|
||||
[4]: https://pynacl.readthedocs.io/en/stable/
|
||||
[5]: https://nacl.cr.yp.to/
|
||||
[6]: https://github.com/SimpleLegal/pocket_protector/blob/master/USER_GUIDE.md
|
||||
@ -1,5 +1,5 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: translator: (robsean)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
|
||||
@ -1,99 +0,0 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (Format Python however you like with Black)
|
||||
[#]: via: (https://opensource.com/article/19/5/python-black)
|
||||
[#]: author: (Moshe Zadka https://opensource.com/users/moshez/users/moshez/users/moshez)
|
||||
|
||||
Format Python however you like with Black
|
||||
======
|
||||
Learn more about solving common Python problems in our series covering
|
||||
seven PyPI libraries.
|
||||
![OpenStack source code \(Python\) in VIM][1]
|
||||
|
||||
Python is one of the most [popular programming languages][2] in use today—and for good reasons: it's open source, it has a wide range of uses (such as web programming, business applications, games, scientific programming, and much more), and it has a vibrant and dedicated community supporting it. This community is the reason we have such a large, diverse range of software packages available in the [Python Package Index][3] (PyPI) to extend and improve Python and solve the inevitable glitches that crop up.
|
||||
|
||||
In this series, we'll look at seven PyPI libraries that can help you solve common Python problems. In the first article, we learned about [Cython][4]; today, we'll examine the **[Black][5]** code formatter.
|
||||
|
||||
### Black
|
||||
|
||||
Sometimes creativity can be a wonderful thing. Sometimes it is just a pain. I enjoy solving hard problems creatively, but I want my Python formatted as consistently as possible. Nobody has ever been impressed by code that uses "interesting" indentation.
|
||||
|
||||
But even worse than inconsistent formatting is a code review that consists of nothing but formatting nits. It is annoying to the reviewer—and even more annoying to the person whose code is reviewed. It's also infuriating when your linter tells you that your code is indented incorrectly, but gives no hint about the _correct_ amount of indentation.
|
||||
|
||||
Enter Black. Instead of telling you _what_ to do, Black is a good, industrious robot: it will fix your code for you.
|
||||
|
||||
To see how it works, feel free to write something beautifully inconsistent like:
|
||||
|
||||
|
||||
```
|
||||
def add(a, b): return a+b
|
||||
|
||||
def mult(a, b):
|
||||
return \
|
||||
a * b
|
||||
```
|
||||
|
||||
Does Black complain? Goodness no, it just fixes it for you!
|
||||
|
||||
|
||||
```
|
||||
$ black math
|
||||
reformatted math
|
||||
All done! ✨ 🍰 ✨
|
||||
1 file reformatted.
|
||||
$ cat math
|
||||
def add(a, b):
|
||||
return a + b
|
||||
|
||||
def mult(a, b):
|
||||
return a * b
|
||||
```
|
||||
|
||||
Black does offer the option of failing instead of fixing and even outputting a **diff** -style edit. These options are great in a continuous integration (CI) system that enforces running Black locally. In addition, if the **diff** output is logged to the CI output, you can directly paste it into **patch** in the rare case that you need to fix your output but cannot install Black locally.
|
||||
|
||||
|
||||
```
|
||||
$ black --check --diff bad
|
||||
\--- math 2019-04-09 17:24:22.747815 +0000
|
||||
+++ math 2019-04-09 17:26:04.269451 +0000
|
||||
@@ -1,7 +1,7 @@
|
||||
-def add(a, b): return a + b
|
||||
+def add(a, b):
|
||||
\+ return a + b
|
||||
|
||||
|
||||
def mult(a, b):
|
||||
\- return \
|
||||
\- a * b
|
||||
\+ return a * b
|
||||
|
||||
would reformat math
|
||||
All done! 💥 💔 💥
|
||||
1 file would be reformatted.
|
||||
$ echo $?
|
||||
1
|
||||
```
|
||||
|
||||
In the next article in this series, we'll look at **attrs** , a library that helps you write concise, correct code quickly.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/19/5/python-black
|
||||
|
||||
作者：[Moshe Zadka ][a]
|
||||
选题：[lujun9972][b]
|
||||
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/moshez/users/moshez/users/moshez
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/openstack_python_vim_1.jpg?itok=lHQK5zpm (OpenStack source code (Python) in VIM)
|
||||
[2]: https://opensource.com/article/18/5/numbers-python-community-trends
|
||||
[3]: https://pypi.org/
|
||||
[4]: https://opensource.com/article/19/4/7-python-problems-solved-cython
|
||||
[5]: https://pypi.org/project/black/
|
||||
@ -1,5 +1,5 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: translator: (Moelf)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
|
||||
@ -1,121 +0,0 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (apt-clone : Backup Installed Packages And Restore Those On Fresh Ubuntu System)
|
||||
[#]: via: (https://www.2daygeek.com/apt-clone-backup-installed-packages-and-restore-them-on-fresh-ubuntu-system/)
|
||||
[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
|
||||
|
||||
apt-clone : Backup Installed Packages And Restore Those On Fresh Ubuntu System
|
||||
======
|
||||
|
||||
Package installation is become more easier on Ubuntu/Debian based systems when we use apt-clone utility.
|
||||
|
||||
apt-clone will work for you, if you want to build few systems with same set of packages.
|
||||
|
||||
It’s time consuming process if you want to build and install necessary packages manually on each systems.
|
||||
|
||||
It can be achieved in many ways and there are many utilities are available in Linux.
|
||||
|
||||
We have already wrote an article about **[Aptik][1]** in the past.
|
||||
|
||||
It’s one of the utility that allow Ubuntu users to backup and restore system settings and data
|
||||
|
||||
### What Is apt-clone?
|
||||
|
||||
[apt-clone][2] lets allow you to create backup of all installed packages for your Debian/Ubuntu systems that can be restored on freshly installed systems (or containers) or into a directory.
|
||||
|
||||
This backup can be restored on multiple systems with same operating system version and architecture.
|
||||
|
||||
### How To Install apt-clone?
|
||||
|
||||
The apt-clone package is available on Ubuntu/Debian official repository so, use **[apt Package Manager][3]** or **[apt-get Package Manager][4]** to install it.
|
||||
|
||||
Install apt-clone package using apt package manager.
|
||||
|
||||
```
|
||||
$ sudo apt install apt-clone
|
||||
```
|
||||
|
||||
Install apt-clone package using apt-get package manager.
|
||||
|
||||
```
|
||||
$ sudo apt-get install apt-clone
|
||||
```
|
||||
|
||||
### How To Backup Installed Packages Using apt-clone?
|
||||
|
||||
Once you have successfully installed the apt-clone package. Simply give a location where do you want to save the backup file.
|
||||
|
||||
We are going to save the installed packages backup under `/backup` directory.
|
||||
|
||||
The apt-clone utility will save the installed packages list into `apt-clone-state-Ubuntu18.2daygeek.com.tar.gz` file.
|
||||
|
||||
```
|
||||
$ sudo apt-clone clone /backup
|
||||
```
|
||||
|
||||
We can check the same by running the ls Command.
|
||||
|
||||
```
|
||||
$ ls -lh /backup/
|
||||
total 32K
|
||||
-rw-r--r-- 1 root root 29K Apr 20 19:06 apt-clone-state-Ubuntu18.2daygeek.com.tar.gz
|
||||
```
|
||||
|
||||
Run the following command to view the details of the backup file.
|
||||
|
||||
```
|
||||
$ apt-clone info /backup/apt-clone-state-Ubuntu18.2daygeek.com.tar.gz
|
||||
Hostname: Ubuntu18.2daygeek.com
|
||||
Arch: amd64
|
||||
Distro: bionic
|
||||
Meta: libunity-scopes-json-def-desktop, ubuntu-desktop
|
||||
Installed: 1792 pkgs (194 automatic)
|
||||
Date: Sat Apr 20 19:06:43 2019
|
||||
```
|
||||
|
||||
As per the above output, totally we have 1792 packages in the backup file.
|
||||
|
||||
### How To Restore The Backup Which Was Taken Using apt-clone?
|
||||
|
||||
You can use any of the remote copy utility to copy the files on remote server.
|
||||
|
||||
```
|
||||
$ scp /backup/apt-clone-state-ubunt-18-04.tar.gz Destination-Server:/opt
|
||||
```
|
||||
|
||||
Once you copy the file then perform the restore using apt-clone utility.
|
||||
|
||||
Run the following command to restore it.
|
||||
|
||||
```
|
||||
$ sudo apt-clone restore /opt/apt-clone-state-Ubuntu18.2daygeek.com.tar.gz
|
||||
```
|
||||
|
||||
Make a note, The restore will override your existing `/etc/apt/sources.list` and will install/remove packages. So be careful.
|
||||
|
||||
If you want to restore all the packages into a folder instead of actual restore, you can do it by using the following command.
|
||||
|
||||
```
|
||||
$ sudo apt-clone restore /opt/apt-clone-state-Ubuntu18.2daygeek.com.tar.gz --destination /opt/oldubuntu
|
||||
```
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://www.2daygeek.com/apt-clone-backup-installed-packages-and-restore-them-on-fresh-ubuntu-system/
|
||||
|
||||
作者：[Magesh Maruthamuthu][a]
|
||||
选题：[lujun9972][b]
|
||||
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.2daygeek.com/author/magesh/
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://www.2daygeek.com/aptik-backup-restore-ppas-installed-apps-users-data/
|
||||
[2]: https://github.com/mvo5/apt-clone
|
||||
[3]: https://www.2daygeek.com/apt-command-examples-manage-packages-debian-ubuntu-systems/
|
||||
[4]: https://www.2daygeek.com/apt-get-apt-cache-command-examples-manage-packages-debian-ubuntu-systems/
|
||||
@ -0,0 +1,99 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (Format Python however you like with Black)
|
||||
[#]: via: (https://opensource.com/article/19/5/python-black)
|
||||
[#]: author: (Moshe Zadka https://opensource.com/users/moshez/users/moshez/users/moshez)
|
||||
|
||||
使用 Black 随意格式化 Python
|
||||
======
|
||||
在我们覆盖 7 个 PyPI 库的系列文章中了解更多解决 Python 问题的信息。
|
||||
![OpenStack source code \(Python\) in VIM][1]
|
||||
|
||||
Python 是当今使用最多的[流行编程语言][2]之一，因为：它是开源的，它有广泛的用途（例如 Web 编程、业务应用、游戏、科学编程等等），它有一个充满活力和专注的社区支持它。这个社区是我们在 [Python Package Index][3]（PyPI）中有如此庞大、多样化的软件包的原因，用以扩展和改进 Python 并解决不可避免的问题。
|
||||
|
||||
在本系列中，我们将介绍七个可以帮助你解决常见 Python 问题的 PyPI 库。在第一篇文章中，我们了解了 [Cython][4]。今天，我们将使用 **[Black] [5]** 这个代码格式化工具。
|
||||
|
||||
### Black
|
||||
|
||||
有时创意可能是一件美妙的事情。有时它只是一种痛苦。我喜欢创造性地解决难题，但我希望我的 Python 格式尽可能一致。没有人对使用“有趣”缩进的代码印象深刻。
|
||||
|
||||
但是比不一致的格式更糟糕的是除了检查格式之外什么都没有的代码审查。这对审查者来说很烦人，对于被审查者人来说甚至更烦人。当你的 linter 告诉你你的代码缩进不正确时，但没有提示_正确_的缩进量，这也会令人气愤。
|
||||
|
||||
使用 Black，它不会告诉你_要_做什么，它是一个优良、勤奋的机器人：它将为你修复代码。
|
||||
|
||||
要了解它如何工作的，请随意写一些非常不一致的内容，例如：
|
||||
|
||||
|
||||
```
|
||||
def add(a, b): return a+b
|
||||
|
||||
def mult(a, b):
|
||||
return \
|
||||
a * b
|
||||
```
|
||||
|
||||
Black 抱怨了么？并没有，它为你修复了！
|
||||
|
||||
|
||||
```
|
||||
$ black math
|
||||
reformatted math
|
||||
All done! ✨ 🍰 ✨
|
||||
1 file reformatted.
|
||||
$ cat math
|
||||
def add(a, b):
|
||||
return a + b
|
||||
|
||||
|
||||
def mult(a, b):
|
||||
return a * b
|
||||
```
|
||||
|
||||
Black 确实提供了错误而不是修复的选项，甚至还有输出 **diff** 编辑样式的选项。这些选项在持续集成 （CI） 系统中非常有用，可以在本地强制运行 Black。此外，如果 **diff** 输出被记录到 CI 输出中，你可以直接将其粘贴到 **patch** 中，以便在极少数情况下你需要修复输出，但无法本地安装 Black。
|
||||
|
||||
|
||||
```
|
||||
$ black --check --diff bad
|
||||
--- math 2019-04-09 17:24:22.747815 +0000
|
||||
+++ math 2019-04-09 17:26:04.269451 +0000
|
||||
@@ -1,7 +1,7 @@
|
||||
-def add(a, b): return a + b
|
||||
+def add(a, b):
|
||||
+ return a + b
|
||||
|
||||
|
||||
def mult(a, b):
|
||||
- return \
|
||||
- a * b
|
||||
+ return a * b
|
||||
|
||||
would reformat math
|
||||
All done! 💥 💔 💥
|
||||
1 file would be reformatted.
|
||||
$ echo $?
|
||||
1
|
||||
```
|
||||
|
||||
在本系列的下一篇文章中，我们将介绍 **attrs** ，这是一个可以帮助你快速编写简洁，正确的代码的库。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/19/5/python-black
|
||||
|
||||
作者：[Moshe Zadka ][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[geekpi](https://github.com/geekpi)
|
||||
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/moshez/users/moshez/users/moshez
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/openstack_python_vim_1.jpg?itok=lHQK5zpm (OpenStack source code (Python) in VIM)
|
||||
[2]: https://opensource.com/article/18/5/numbers-python-community-trends
|
||||
[3]: https://pypi.org/
|
||||
[4]: https://opensource.com/article/19/4/7-python-problems-solved-cython
|
||||
[5]: https://pypi.org/project/black/
|
||||
Loading…
Reference in New Issue
Block a user