Friday, April 8, 2022

[SOLVED] How to make a child process survive service shutdown?

Issue

script1.py:

#do somthing
os.system('nohup python3 -u script2.py {} {} >> {}.out &'.format(xxx, yyy, zzz))
#do somthing

script2.py: this scipt always run with loop.run_forever()

When script1 run as a service, this script runs script2 correctly. But if i kill Script1 with 'kill pid' command, Script2 will also be killed automatically, which I do not want and I want Script2 to continue working.

Edit: I use systemd for running script1.py


Solution

If you want child processes you start to not be killed by systemd, change the KillMode configured for your service. Thus, in your service file:

[Service]
KillMode=process

The default value is KillMode=control-group, such that systemd kills everything in the cgroup it created for the service; and nohup doesn't know anything about cgroups.



Answered By - Charles Duffy
Answer Checked By - Dawn Plyler (WPSolving Volunteer)
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