[pkg-lxc-devel] Bug#1118768: Bug#1118768: lxc-templates: included config file has config for cgroup1 on a cgroup2 system

[Mathias Gibbens]

Hi Richard,

On Sat, 2025-10-25 at 15:31 +1300, Richard Hector wrote:
> I believe these are for cgroup1 systems, but these files are still
> being installed on cgroup2 systems.

  cgroup v1 was supported by systemd through version 257, which is what
shipped in trixie. As such, we should keep cgroup v1 entries even
though they may not see much use on "current" systems. As you note
below, a warning may be generated, but I think that's OK as there's no
impact on the running containers.

> I'm no expert, but I suspect that's the reason for these warnings:
> 
> lxc max-wp1 20241104110429.560 WARN     cgfsng - ../src/lxc/cgroups/cgfsng.c:cgfsng_setup_limits_legacy:3155 - Invalid argument - Ignoring legacy cgroup limits on pure cgroup2 system
> 
> That may be just a warning, but presumably this is ineffective, and
> there should be equivalent cgroup2 lines somewhere?

  The packaging of lxc-templates for trixie includes corresponding
cgroup v2 rules in /usr/share/lxc/config/debian.common.conf.

> I'm still running bookworm, but I checked the trixie package, and
> that file has the same entries in it.

  lxc-templates is considered deprecated in favor of distrobuilder by
upstream. I expect that lxc-templates will be removed during the
forky+1 development cycle. However, if you would like to make
improvements (such as removing cgroup v1 rules for the forky release),
please feel free to do so. I would suggest starting be looking at some
of the Debian-specific patches, then working to get any relevant
changes merged into the upstream project. That will benefit all
distros, and will be easy to incorporate into packaging updates for
Debian.

Mathias
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