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update at 2017年 12月 17日 星期日 12:45:56 CST
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Translating by lujun9972
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How to protects Linux and Unix machines from accidental shutdowns/reboots with molly-guard
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======
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Oops! I did it again. I thought I was logged into my home server. Turns out [I rebooted the db server][1]. Another my not so favorite is typing "[shutdown -h 0][2]" into the wrong terminal. I know a few people who have [admitted to doing that here][3].
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![My anger that can't be contained][4]
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Is there any end to the madness? Do I need to suffer from accidentally random reboots and shutdowns? After all, it is human nature to make mistakes, but one should not keep on making the same mistakes again and again.
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Recently I tweeted my frustration:
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> I seems to run into this stuff again and again :( Instead of typing:
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> sudo virsh reboot d1
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>
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> I just typed & rebooted my own box
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> sudo reboot d1
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>
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> -- nixCraft (@nixcraft) [February 19, 2017][5]
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I come across quite a few suggestion on Twitter. Let us try out those.
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### Say hello to molly guard
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Molly-Guard **try to block you from accidentally running or shutting down or rebooting Linux servers**. From the Debian/Ubuntu package description:
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> The package installs a shell script that overrides the existing shutdown/reboot/halt/poweroff/coldreboot/pm-hibernate/pm-suspend* commands and first runs a set of scripts, which all have to exit successfully, before molly-guard invokes the real command. One of the scripts checks for existing SSH sessions. If any of the four commands are called interactively over an SSH session, the shell script prompts you to enter the name of the host you wish to shut down. This should adequately prevent you from accidental shutdowns and reboots.
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It seems [molly-guard][6] has the entry in the Jargon File:
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> A shield to prevent tripping of some Big Red Switch by clumsy or ignorant hands. Originally used of the plexiglass covers improvised for the BRS on an IBM 4341 after a programmer's toddler daughter (named Molly) frobbed it twice in one day. Later generalized to covers over stop/reset switches on disk drives and networking equipment. In hardware catalogues, you'll see the much less interesting description "guarded button".
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### How to install molly guard
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Type the following command to search and install molly-guard using [apt-get command][7] or [apt command][8]:
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```
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$ apt search molly-guard
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$ sudo apt-get install molly-guard
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```
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Sample outputs:
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[![Fig.01: Installing molly guard on Linux][9]][10]
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### Test it
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Type the [reboot command][11] or shutdown command:
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```
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$ sudo reboot
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# reboot
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$ shutdown -h 0
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# sudo shutdown -h 0
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### running wrong command such as follows instead of
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### sudo virsh reboot vm_name_here
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$ sudo reboot vm_name_here
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```
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Sample outputs:
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![Fig.02: Molly guard saved my butt ;\)][12]
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I liked molly-guard so much. I updated my apt-debian-ubuntu-common.yml file with the following lines:
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```
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- apt:
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name: molly-guard
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```
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That's right. It is now part of all of my Debian and Ubuntu servers automation tasks done using Ansible tool.
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**Related** : [My 10 UNIX Command Line Mistakes][13]
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### What if molly-guard not available on my Linux distro or Unix system like FreeBSD?
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Fear not, [set shell aliases][14]:
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```
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## bash shell example ###
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alias reboot = "echo 'Are you sure?' If so, run /sbin/reboot"
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alias shutdown = "echo 'Are you sure?' If so, run /sbin/shutdown"
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```
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You can [temporarily get rid of an aliases and run actual command][15] such as reboot:
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```
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# \reboot
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```
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OR
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```
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# /sbin/reboot
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```
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Another option is to write a [shell/perl/python script calling these and asking][16] confirmation for reboot/halt/shutdown options.
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--------------------------------------------------------------------------------
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via: https://www.cyberciti.biz/hardware/how-to-protects-linux-and-unix-machines-from-accidental-shutdownsreboots-with-molly-guard/
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作者：[Vivek Gite][a]
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译者：[lujun9972](https://github.com/lujun9972)
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校对：[校对者ID](https://github.com/校对者ID)
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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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[a]:https://www.cyberciti.biz
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[1]:https://www.cyberciti.biz/faq/howto-reboot-linux/
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[2]:https://www.cyberciti.biz/faq/shutdown-linux-server/
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[3]:https://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html (My 10 UNIX Command Line Mistakes)
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[4]:https://www.cyberciti.biz/media/new/cms/2017/02/anger.gif
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[5]:https://twitter.com/nixcraft/status/833320792880320513
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[6]:http://catb.org/~esr/jargon/html/M/molly-guard.html
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[7]://www.cyberciti.biz/tips/linux-debian-package-management-cheat-sheet.html (See Linux/Unix apt-get command examples for more info)
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[8]://www.cyberciti.biz/faq/ubuntu-lts-debian-linux-apt-command-examples/ (See Linux/Unix apt command examples for more info)
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[9]:https://www.cyberciti.biz/media/new/cms/2017/02/install-molly-guard-on-linux.jpg
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[10]:https://www.cyberciti.biz/hardware/how-to-protects-linux-and-unix-machines-from-accidental-shutdownsreboots-with-molly-guard/attachment/install-molly-guard-on-linux/
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[11]:https://www.cyberciti.biz/faq/linux-reboot-command/ (See Linux/Unix reboot command examples for more info)
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[12]:https://www.cyberciti.biz/media/new/cms/2017/02/saved-my-butt.jpg
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[13]:https://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html
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[14]:https://www.cyberciti.biz/tips/bash-aliases-mac-centos-linux-unix.html
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[15]:https://www.cyberciti.biz/faq/bash-shell-temporarily-disable-an-alias/
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[16]:https://github.com/kjetilho/clumsy_protect
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[17]:https://twitter.com/nixcraft
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[18]:https://facebook.com/nixcraft
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[19]:https://plus.google.com/+CybercitiBiz
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@ -0,0 +1,114 @@
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使用 molly-guard 保护你的 Linux/Unix 机器不会被错误地关机/重启
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======
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我去！又是这样。 我还以为我登录到家里的服务器呢。 结果 [重启的居然是数据库服务器 ][1]。 另外我也有时会在错误终端内输入 "[shutdown -h 0][2]" 命令。 我知道有些人 [经常会犯这个错误 ][3]。
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![我的愤怒无从容忍 ][4]
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有办法解决这个问题吗？我真的只能忍受这种随机重启和关机的痛苦吗？ 虽说人总是要犯错的，但总不能一错再错吧。
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最新我在 tweet 上发了一通牢骚：
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> I seems to run into this stuff again and again :( Instead of typing：
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> sudo virsh reboot d1
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>
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> I just typed & rebooted my own box
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> sudo reboot d1
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>
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> -- nixCraft (@nixcraft) [February 19，2017][5]
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结果收到了一些建议。我们来试一下。
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### 向你引荐 molly guard
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Molly-Guard **尝试阻止你不小心关闭或重启 Linux 服务器**。它在 Debian/Ubuntu 中的包描述为：
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> The package installs a shell script that overrides the existing shutdown/reboot/halt/poweroff/coldreboot/pm-hibernate/pm-suspend* commands and first runs a set of scripts，which all have to exit successfully， before molly-guard invokes the real command。 One of the scripts checks for existing SSH sessions。 If any of the four commands are called interactively over an SSH session， the shell script prompts you to enter the name of the host you wish to shut down。 This should adequately prevent you from accidental shutdowns and reboots。
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貌似 [molly-guard][6] 还是个专有名词：
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> A shield to prevent tripping of some Big Red Switch by clumsy or ignorant hands。Originally used of the plexiglass covers improvised for the BRS on an IBM 4341 after a programmer's toddler daughter (named Molly) frobbed it twice in one day。 Later generalized to covers over stop/reset switches on disk drives and networking equipment。 In hardware catalogues， you'll see the much less interesting description "guarded button"。
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### 如何安装 molly guard
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使用 [apt-get command][7] 或者 [apt command][8] 来搜索并安装 molly-guard：
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```
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$ apt search molly-guard
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$ sudo apt-get install molly-guard
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```
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结果为：
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[![Fig.01： Installing molly guard on Linux][9]][10]
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### 测试一下
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输入 [reboot 命令 ][11] 和 shutdown 命令：
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```
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$ sudo reboot
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# reboot
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$ shutdown -h 0
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# sudo shutdown -h 0
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### running wrong command such as follows instead of
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### sudo virsh reboot vm_name_here
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$ sudo reboot vm_name_here
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```
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结果为：
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![Fig.02： Molly guard saved my butt ;\)][12]
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我超级喜欢 molly-guard。因此我将下行内容加入到 apt-debian-ubuntu-common.yml 文件中了：
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```
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- apt：
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name： molly-guard
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```
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是的。我使用 Ansible 在所有的 Debian 和 Ubuntu 服务器上都自动安装上它了。
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**相关** ： [My 10 UNIX Command Line Mistakes][13]
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### 如果我的 Linux 发行版或者 Unix 系统（比如 FreeBSD） 没有 molly-guard 怎么办呢？
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不用怕，[设置 shell 别名 ][14]：
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```
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## bash shell example ###
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alias reboot = "echo 'Are you sure？' If so， run /sbin/reboot"
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alias shutdown = "echo 'Are you sure？' If so， run /sbin/shutdown"
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```
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你也可以 [临时取消别名机制运行真正的命令 ][15]。比如要运行 reboot 可以这样：
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```
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# \reboot
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```
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或者
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```
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# /sbin/reboot
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```
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另外你也可以写一个 [shell/perl/python 脚本来调用这些命令并要求 ][16] 确认 reboot/halt/shutdown 的选项。
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--------------------------------------------------------------------------------
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via: https://www.cyberciti.biz/hardware/how-to-protects-linux-and-unix-machines-from-accidental-shutdownsreboots-with-molly-guard/
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作者：[Vivek Gite][a]
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译者：[lujun9972](https://github.com/lujun9972)
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校对：[校对者ID](https://github.com/校对者ID)
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||||
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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
|
||||
|
||||
[a]:https://www.cyberciti.biz
|
||||
[1]:https://www.cyberciti.biz/faq/howto-reboot-linux/
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||||
[2]:https://www.cyberciti.biz/faq/shutdown-linux-server/
|
||||
[3]:https://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html (My 10 UNIX Command Line Mistakes)
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[4]:https://www.cyberciti.biz/media/new/cms/2017/02/anger.gif
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[5]:https://twitter.com/nixcraft/status/833320792880320513
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[6]:http://catb.org/~esr/jargon/html/M/molly-guard.html
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[7]://www.cyberciti.biz/tips/linux-debian-package-management-cheat-sheet.html (See Linux/Unix apt-get command examples for more info)
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[8]://www.cyberciti.biz/faq/ubuntu-lts-debian-linux-apt-command-examples/ (See Linux/Unix apt command examples for more info)
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[9]:https://www.cyberciti.biz/media/new/cms/2017/02/install-molly-guard-on-linux.jpg
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[10]:https://www.cyberciti.biz/hardware/how-to-protects-linux-and-unix-machines-from-accidental-shutdownsreboots-with-molly-guard/attachment/install-molly-guard-on-linux/
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[11]:https://www.cyberciti.biz/faq/linux-reboot-command/ (See Linux/Unix reboot command examples for more info)
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[12]:https://www.cyberciti.biz/media/new/cms/2017/02/saved-my-butt.jpg
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[13]:https://www.cyberciti.biz/tips/my-10-unix-command-line-mistakes.html
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[14]:https://www.cyberciti.biz/tips/bash-aliases-mac-centos-linux-unix.html
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[15]:https://www.cyberciti.biz/faq/bash-shell-temporarily-disable-an-alias/
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[16]:https://github.com/kjetilho/clumsy_protect
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[17]:https://twitter.com/nixcraft
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[18]:https://facebook.com/nixcraft
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[19]:https://plus.google.com/+CybercitiBiz
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