Bug#989317: systemd kill background processes after user logs out (#825394 regression)

[Michael Biebl]

Control: reassign -1 lxc

As discussed on #debian-release, I'm going to reassign this bug report 
to lxc as peb has plans to add a helper script which intends to improve 
the user experience when running unprivileged containers under cgroupv2.
Quoting the relevant part from IRC:

> my reason for asking is that I'd like to add an helper script to the package
> currently, under pure CGroups v2 systemd hosts, an unprivileged container can't be started without running a systemd-run --user command with some tweaks
> I'd like to provide the users with a lxc-unpriv-start script that'll do the needed work or give them hints on what to do
> anymore because systemd gets in the way. Using systemd for this, 


[...]


> A short summary: Debian bullseye switched to cgroupv2 which now makes it 
> necessary to run lxc-start as unprivileged user via "systemd-run -p 
> Delegate=yes".
> This in turn makes the lxc processes part of the systemd --user session, 
> not the login session. Which in turn requires "linger" to enable daemon 
> processes to persist once a user logs out.
> 
> Maybe I missed something and linger is the only option in this case (and 
> lxc's README.Debian could have a note about this). Or maybe there is a 
> different way to achieve what Matt is trying to do?





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