If you have a long running process that can be killed for strange and unknown reason, you might want it to be restarted ... this script does that.
Python, 36 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #!/usr/bin/env python
import sys
import time
import subprocess
"""
Keep a process up and running
If you have a long running process that can be killed for strange and unknown
reason, you might want it to be restarted ... this script does that.
$ cat alive.sh
#!/bin/sh
while `true`; do echo Alive && sleep 3 ; done
Use it like this:
$ keepup.py ./alive.sh
"""
cmd = ' '.join(sys.argv[1:])
def start_subprocess():
return subprocess.Popen(cmd, shell=True)
p = start_subprocess()
while True:
res = p.poll()
if res is not None:
print p.pid, 'was killed, restarting it'
p = start_subprocess()
time.sleep(1)
|
Tags: sysadmin
Curious, what's the point of this if you're already running something from a shell?
The while true command is to demonstrate how this works.
You can jump to another terminal and kill the ./alive.sh process, you will notice it is gonna be started again a few second later, and continue to see the "Alive" screen being printed in your terminal.
Right, but this would still do the same thing, wouldn't it?
You could kill alive.sh and it would be restarted. It's just not clear to me why I would want to use 20 lines of python instead of one line of shell. I figured I might be missing the point... but maybe not.
I think you're right, it's the same feature :) Now you have to package your long line into a script (my python script is keepup.py), because it's a very long line to type ...