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bug#41429: Shepherd Sometimes Crashes
From: |
Katherine Cox-Buday |
Subject: |
bug#41429: Shepherd Sometimes Crashes |
Date: |
Thu, 21 May 2020 10:59:43 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Efraim Flashner <address@hidden> writes:
>> Your comment is kind of scary though! Shepherd is the thing I want to
>> stay up no matter what since it's responsible for monitoring and
>> restarting things. The idea that a misbehaving or poorly written service
>> could bring down the entire Shepherd process is a problem! Is there no
>> isolation?
>
> I have a whole collection of attempts to integrate mcron with shepherd,
> to create loops and add jobs only when the service is active. Attempting
> to fork off and then collect the child process and then fail just enough
> to make the service restart. Lots of cringe-worthy code. The more common
> fail scenarios I see are shepherd fails to start because it doesn't like
> my start code of one of the services or actually starting the service
> somehow kills it. All of those were with straight lambdas to the start
> command though.
I'm not familiar with Shepherd's internals, so I don't know why
interacting with a cron is relevant.
> Do you have your services writing out any logs? Maybe there's a clue
> there.
Not yet, but I should be enabling this soon, and if they display
anything I'll report back.
Still, this seems beside the point: the bug is that Shepherd needs to
stay up regardless of what the services it's monitoring do.
--
Katherine