Bug#825394: systemd kill background processes after user logs out

[Michael Biebl]

Hi Guus,

Am 26.05.2016 um 18:16 schrieb Guus Sliepen:
>> systemd-logind will now by default terminate user processes that are
>> part of the user session scope unit (session-XX.scope) when the user
>> logs out.
> 
> It is now indeed the case that any background processes that were still
> running are killed automatically when the user logs out of a session,
> whether it was a desktop session, a VT session, or when you SSHed into a
> machine.
> 
> Now you can no longer expect a long running background processes to
> continue after logging out.

Unless you use systemd-run/linger, then you can still expect those
background processes to continue to run.
But I guess this wasn't your point.

 I believe this breaks the expecations of
> many users. For example, you can no longer start a screen or tmux
> session, log out, and expect to come back to it. For this reason, I
> think it is a bad decision on the part of the systemd maintainers to
> enable this feature by default, and it should rather be disabled by
> default in Debian, either by compiling systemd with
> --without-kill-user-processes or by setting KillUserProcesses=no in
> /etc/systemd/logind.conf.

The new requirement of having to enable lingering and starting
tmux/screen/nohup/ via systemd-run can certainly be considered a
nuisance and something our users are not necessarily aware of.
I share that concern.
So a NEWS.Debian entry would be the least we should do. And maybe
documenting it in the release notes.

That all said, we'll discuss that within the team. I couldn't get hold
of Martin on irc, so this might take a couple of days (I won't be around
much over the weekend).
I personally need to do some more research first, e.g. how that affects
systemd/dbus user sessions.

Regards,
Michael
-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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