We're migrating many of our servers from Linux to FreeBSD

Re:We're migrating many of our servers from Linux to FreeBSD by capitainenemo on Tuesday January 25, 2022 @10:20AM (#30072737)

Wait... how would pid wrapping impact anything at all unless the process died and the pid file was stale (which is usually a fairly unusual circumstance - I've had it happen maybe a dozen times over the last couple of decades). And I guess if you have stuff surprise dying without any of the usual cleanup, you have a pretty serious situation in general. Maybe need a process monitor service just for that :)

I was focusing on the "surprise startup" scenario where it would all get wiped and reset.

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Re:We're migrating many of our servers from Linux to FreeBSD by fullstop on Tuesday January 25, 2022 @10:42AM (#30073025)

As with anything else, your chances increase with the number of processes you have running.

If it blindly reads the pid and sends a kill signal, your odds are pretty good with a limit of 32K pids on a busy system. If it confirms that the process name matches an expected value, you have less of a chance.. but if your process name is bash, java, or python, maybe not as good as you would hope.

I don't have things crashing a lot, but it's naive to pretend that it never happens. It could result in two things: the rc system telling me that everything is fine or the rc system sending signals to some unrelated, poor, unsuspecting, processes.

I don't need a process monitor just for that. I have systemd. :-)

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