捕获来自“ docker stop”的信号猛扑 [英] trapping signal from "docker stop" in bash

问题描述

我在Docker容器中有一个入口点脚本，如下所示：

i have an entry point script in a docker container that looks something like the following:

#!/bin/bash

echo starting up

function shut_down() {
    echo shutting down

    pid=$(ps -e | grep myapp | awk '{print $1}')
    kill -SIGTERM $pid  
    exit
}

trap "shut_down" SIGKILL SIGTERM SIGHUP SIGINT EXIT

/opt/myapp

我不知道如何捕获通过运行发送的信号在容器上 docker stop 。交互式运行时， ctrl + c 会按预期触发它，但是 docker stop 命令仅等待10第二次超时，并且退出而没有进入 shut_down 函数

I can't figure out how to trap the signal sent in by running docker stop on the container. When running interactively, a ctrl+c will trigger it as expected, but a docker stop command just waits for the 10 second timeout, and exits without ever entering the shut_down function

如何捕获<$ c发送的信号$ c> docker stop 用bash进行清理吗？

How can I trap the signal sent by docker stop in bash to do some cleanup?

推荐答案

看看此，可能会令人鼓舞：-）

Have a look at this, could be inspiring :-)

更新：

@ nick-humrich这是我的较早副本&过去（贷记给原始作者 https://github.com/lgierth ）

@nick-humrich here it is is my lamer copy & past (credit goes to the original author https://github.com/lgierth )

#!/bin/bash

function ensure_started_container {
  exists=`docker ps -q | grep $1`
  if [ "$?" = "0" ] ; then
    echo "[docker-exec] skipping docker start, already started"
  else
    output=`docker start "$1"`
    echo "[docker start] $output"
  fi
  running=1
}

function setup_signals {
  cid="$1"; shift
  handler="$1"; shift
  for sig; do
    trap "$handler '$cid' '$sig'" "$sig"
  done
}

function handle_signal {
  echo "[docker-exec] received $2"
  case "$2" in
    SIGINT)
      output=`docker stop -t 5 "$1"`
      echo "[docker stop] $output"
      running=0
      ;;
    SIGTERM)
      output=`docker stop -t 5 "$1"`
      echo "[docker stop] $output"
      running=0
      ;;
    SIGHUP)
      output=`docker restart -t 5 "$1"`
      echo "[docker restart] $output"

      # restart logging
      docker attach "$1" &
      kill "$logger_pid" 2> /dev/null
      logger_pid="$!"
      ;;
  esac
}

running=0

setup_signals "$1" "handle_signal" SIGINT SIGTERM SIGHUP

ensure_started_container "$1"

docker attach "$1" &
logger_pid="$!"

while true; do
  if [ "$running" = "1" ]; then
    sleep 1
  else
    break
  fi
done

exit_code=`docker wait "$1"`
exit "$exit_code"

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