我终止Docker容器时如何执行脚本 [英] How to execute a script when I terminate a docker container

问题描述

在控制台上键入时想要：

I want when I type on my console:

docker ^a docker container^ stop

在终止之前执行脚本。

To execute a script before terminating. is that possible?

推荐答案

docker stop命令首先尝试通过发送一个停止运行的容器来停止正在运行的容器SIGTERM信号发送到容器中的根进程（PID 1）。如果未在超时时间内退出该进程，则将发送SIGKILL信号。

The docker stop command attempts to stop a running container first by sending a SIGTERM signal to the root process (PID 1) in the container. If the process hasn't exited within the timeout period a SIGKILL signal will be sent.

实际上，这意味着您必须定义一个ENTRYPOINT脚本，该脚本将拦截（捕获）SIGTERM信号并酌情执行任何关闭逻辑。

In practice, that means that you have to define an ENTRYPOINT script, which will intercept (trap) the SIGTERM signal and execute any shutdown logic as appropriate.

示例入口点脚本如下所示：

A sample entrypoint script can look something like this:

#!/bin/bash

#Define cleanup procedure
cleanup() {
    echo "Container stopped, performing cleanup..."
}

#Trap SIGTERM
trap 'cleanup' SIGTERM

#Execute a command
"${@}" &

#Wait
wait $!

（关于 wait 的shell信号处理在位更多详细信息此处）

(shell signal handling, with respect to wait, is explained in a bit more details here)

请注意，在上面的入口点，仅当容器显式停止时才执行清除逻辑，如果您希望它在基础进程/命令本身停止（或失败）时也运行，则可以按以下方式对其进行重组。

Note, that with the entrypoint above, the cleanup logic will only be executed if container is stopped explicitly, if you wish it to also run when the underlying process/command stops by itself (or fails), you can restructure it as follows.

...

#Trap SIGTERM
trap 'true' SIGTERM

#Execute command
"${@}" &

#Wait
wait $!

#Cleanup
cleanup

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