bash 监控重启程序脚本
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Monit restart program script
提问by Zero
I am fairly new to monit and I was wondering if this script is enough to restart a crashed program lets say program1 is the name of the program.
我对 monit 还很陌生，我想知道这个脚本是否足以重新启动崩溃的程序让我们说 program1 是程序的名称。
check process program1
matching "program1"
start program = "/home/user/files/start.sh"
stop program = "/home/user/files/stop.sh"
Will it restart a crashed program now? And how can I assure it does not restart the program when it is working?
它现在会重新启动崩溃的程序吗？我如何确保它在工作时不会重新启动程序？
Edit: some more info The program uses port 30000 udp. Will this make it more cautious? And how many seconds are between the "cycles"?
编辑：更多信息 该程序使用端口 30000 udp。这会让它更加谨慎吗？“周期”之间有多少秒？
if failed port 30000 type UDP for 3 cycles then restart
回答by Зелёный
Monit uses the system call execv to execute a program or a script. This means that you cannot write shell commands directly in the start, stop or exec statements. To do this, you must do as above; start a shell and issue your commands there.
Monit 使用系统调用 execv 来执行程序或脚本。这意味着您不能直接在 start、stop 或 exec 语句中编写 shell 命令。为此，您必须按上述操作；启动一个 shell 并在那里发出你的命令。
This is just example what you should execute program or script:
这只是您应该执行程序或脚本的示例：
check process program1
matching "program1"
start program = "/bin/bash -c '/home/user/files/start.sh'"
stop program = "/bin/bash -c '/home/user/files/stop.sh'"
Based on ConfigurationExamples
回答by slashmili
let's say you have a script like this:
假设你有一个这样的脚本：
#!/usr/bin/python
import os, time
f = open('/tmp/myapp.pid', 'w')
f.write(str(os.getpid()))
f.close()
time.sleep(9)
Create a monit.conf
创建一个 monit.conf
set httpd port 2812 and allow monit:monit
set daemon 5
check process program with pidfile /tmp/myapp.pid
start program = "/home/vagrant/myapp.py
Then run the monit with this command:
然后使用以下命令运行 monit：
monit -c monit.conf
Now Monit runs in the background and rerun the process if it dies
现在 Monit 在后台运行并在它死掉时重新运行该进程
回答by Juvenik
I will start a simple node server, which if you kill, monit is gonna restart it again and you will get an email too if set up correctly.
我将启动一个简单的节点服务器，如果你杀死它，monit 会重新启动它，如果设置正确，你也会收到一封电子邮件。
location /home/xxx/monitoring/nodejs
地点 /home/xxx/monitoring/nodejs
File: node-server.js
文件：node-server.js
var http = require('http');
var port = 8002;
var fs = require('fs');
var logStream = fs.createWriteStream(port+"_log.txt", {'flags':'a'});
var count = 0;
http.createServer(function(req, res){
var output = (++count) + ' Request received in '+port+' @ ' + new Date()+'\n';
console.log(output);
logStream.write(output);
res.writeHead(200, {'Content-Type' : 'text/plain'});
res.end('From '+port+' @ ' + new Date());
}).listen(port);
console.log('Server running @ ' + port)
FILE: server.sh
文件：server.sh
#!/bin/bash
process=
PID_FILE="/home/xxx/monitoring/nodejs/file.pid"
case $process in
start)
echo "STARTING node js server in port 8002"
nohup /usr/sbin/node /home/xxx/monitoring/nodejs/node-server.js > /home/xxx/monitoring/nodejs/server.log 2>&1 &
echo $! > $PID_FILE
;;
stop)
kill -9 $(cat $PID_FILE)
rm $PID_FILE
;;
*)
echo "INVALID OPTION"
;;
esac
LOCATION: /etc/monit/monitrc (for ubuntu)
位置：/etc/monit/monitrc（对于 ubuntu）
set mail-format {
from: monit@TEST
subject: monit alert -- XXX-PROD $EVENT $SERVICE
message: $EVENT Service $SERVICE
Date: $DATE
Action: $ACTION
Host: $HOST
Description: $DESCRIPTION
Your faithful employee,
}
set mailserver smtp.gmail.com port 587 username "[email protected]" password "xxx" using tlsv1
set alert [email protected]
check process nodejs-server with pidfile /home/xxx/monitoring/nodejs/file.pid
start program = "/home/xxx/monitoring/nodejs/server.sh start"
stop program = "/home/xxx/monitoring/nodejs/server.sh stop
"
”
Once the server runs, hit the browser http://localhost:8002/. It will display some result. Now kill the process by finding its process id either from 'monit status' or from any other means. You will get a mail saying the process does not exists but again after some time, the server will run and you will get a mail saying 'process started again'.
服务器运行后，点击浏览器http://localhost:8002/。它会显示一些结果。现在通过从“监控状态”或任何其他方式查找进程 ID 来终止进程。您将收到一封邮件，说明该进程不存在，但一段时间后，服务器将再次运行，您将收到一封邮件，说明“进程再次启动”。
But please remember, if you stop the process from monit command like
但是请记住，如果您从 monit 命令中停止该进程，例如
monit stop nodejs-server
then it will not get restarted. And you get a mail saying that ur process has been stopped.
那么它不会重新启动。然后您收到一封邮件，说您的进程已停止。
