[systemd-bugs] [Bug 90273] RFE: make it easy to plug in monitor tools that are run after completion of specific services and can process their logs (example: sendmail tool that mails service logs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90273

Lennart Poettering <lennart at poettering.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Please consider             |RFE: make it easy to plug
                   |Standard{Output,Error}=<mai |in monitor tools that are
                   |laddress>                   |run after completion of
                   |                            |specific services and can
                   |                            |process their logs
                   |                            |(example: sendmail tool
                   |                            |that mails service logs)

--- Comment #1 from Lennart Poettering <lennart at poettering.net> ---
Well, distros like Fedora default to logging cron job output, rather than
mailing, and I am very sure that's a much better approach. 

I am pretty sure that systemd should not call into sendmail directly.

I think it would make sense to provide a nice way how users/admins can plug
something into services that allow sending logs via email after services
completed running. We already support "journalctl -u <unit>" as a nice way to
pull the logs out from a unit, we'd then need a good way to get this invoked
each time a service ran, with the right time parameter to only show the bits
generated since the service was started the last time.

Not sure how precisely this could look like, but I think it would be pretty
useful to have this. Downstream could then add ready-made tools to use this for
sending emails when jobs complete.

Maybe something as simply as using ExecStopPost= for this, with an env var
$LOGS_SINCE that is set to the activation time of a service could suffice.
Then, users could use ExecStopPost=/usr/bin/monitor-script foo at bar.com that
implements what is need.

I am taking the liberty to change the bug title, to ask for this.

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