在 docker 容器中捕获信号

发布时间：2020-12-16 03:56:42 所属栏目：安全来源：网络整理

导读：process.on('SIGTERM', 'shutting down...' 'use strict' span style="color: #0000ff"var http = require('http'span style="color: #000000"); span style="color: #0000ff"var server = http.createServer(span style="color: #0000ff"function span styl

process.on('SIGTERM','shutting down...'

'use strict'var http = require('http');

var server = http.createServer(function (req,res) {
res.writeHead(200,{'Content-Type': 'text/plain'});
res.end('Hello Worldn');
}).listen(3000,'0.0.0.0');

console.log('server started');

var signals = {
'SIGINT': 2,'SIGTERM': 15
};

function shutdown(signal,value) {
server.close(function () {
console.log('server stopped by ' + signal);
process.exit(128 + value);
});
}

Object.keys(signals).forEach(function (signal) {
process.on(signal,function () {
shutdown(signal,signals[signal]);
});
});

/app.js .//package.json ./,]

$ docker build --no-cache -t signal-app -f Dockerfile .

$ docker run -it -- -p : --name= signal-app

$ docker container --signal= my-app

#!/usr/bin/

/app.js .//app1. ./app1./package.json ./ +x ./app1.]

$ docker build --no-cache -t signal-app1 -f Dockerfile1 .

$ docker run -it -- -p : --name= signal-app1

$ docker container stop my- --signal= my-app1

#!/usr/bin/-pid=0

SIGUSR1-handler

my_handler() {
echo "my_handler"
}

SIGTERM-handler

term_handler() {
if [ $pid -ne 0 ]; then
kill -SIGTERM "$pid"
wait "$pid"
fi
exit 143; # 128 + 15 -- SIGTERM
}

setup handlers

on callback,kill the last background process,which is `tail -f /dev/null` and execute the specified handler

trap 'kill ${!}; my_handler' SIGUSR1
trap 'kill ${!}; term_handler' SIGTERM

run application

node app &
pid="$!"

wait forever

while true
do
tail -f /dev/null & wait ${!}
done

/app.js .//app2. ./app2./package.json ./ +x ./app2.]

$ docker build --no-cache -t signal-app2 -f Dockerfile2 .

$ docker run -it -- -p : --name= signal-app2

（编辑：李大同）

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在 docker 容器中捕获信号

SIGUSR1-<span style="color: #000000">handler

SIGTERM-<span style="color: #000000">handler

setup handlers

on callback,<span style="color: #0000ff">kill the <span style="color: #0000ff">last background process,<span style="color: #0000ff">which is `<span style="color: #0000ff">tail</span> -f /dev/<span style="color: #0000ff">null</span><span style="color: #000000">` and execute the specified handler

run application

<span style="color: #0000ff">wait<span style="color: #000000"> forever