Re: capturing system shutdown signals?

That's another interesting idea. 127.0.0.1/poweroff handler. 

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On Apr 27, 2024, 16:34, at 16:34, Alexander Schreiber <[email protected]> wrote:
>On Sat, Apr 27, 2024 at 02:22:57AM +0300, Stas Boukarev wrote:
>> systemd is able to execute commands in ExecStop=.
>
>You are mixing different things. ExecStop in systemd is part of the
>systemd control flow for units and has nothing to do with signal
>handling or system/kernel level handling of process termination.
>
>_If_ your service runs as a systemd unit you _might_ be able to use
>this to run a command to signal your process "hey, could you shutdown
>gracefully before I shoot you in the head, please?". E.g. for a
>webserver you could call a /quitquitquit URL endpoint (which you'd then
>have to ACL to e.g. localhost to keep others from having fun at your
>expense). That endpoint, once invoked, should then perform whatever
>is needed to gracefully shutdown your webserver (e.g. refuse further
>incoming connections, wait for running URL handlers to complete (with
>timeout), close open files, ... and finally exit).
>
>Kind regards,
>          Alex.
>-- 
>"Opportunity is missed by most people because it is dressed in overalls
>and
> looks like work."
>
>
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