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That’s why you launch them through systemd.
The constant nagging by you systemd people worked. I’ve written a unit that does what I need it to do. That was more annoying than I think it needed to be, but well… my solution didn’t work at all.
AFAIK kernel itself doesn’t send any signals to processes on shutdown/reboot, it just stops executing them. This is a job service manager (e.g. systemd) that terminates processes using SIGTERM before asking kernel to shutdown.
Interesting. Is this top answer accurate then?
https://stackoverflow.com/questions/31731980/handling-a-linux-system-shutdown-operation-gracefully
