Hello, I upgraded debian from 10 to 11 and I can't start k3s server:

failed to find cpuset cgroup (v2)

k3s check-config:

Generally Necessary:
- cgroup hierarchy: cgroups V2 mounted, cpu|cpuset|memory controllers status: bad (fail)
    (for cgroups V1/Hybrid on non-Systemd init see <https://github.com/tianon/cgroupfs-mount>)
- /usr/sbin/apparmor_parser
apparmor: enabled and tools installed

I already set

GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=0"

And it does not work 😕

What version of K3s?

k3s version v1.25.2+k3s1 (53c268d8)
go version go1.19.1

I read that it should work with cgroups2

Yeah I believe so as well

Thanks for help, I got it working with `/etc/default/grub`:

GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=0"

and then:

update-grub
reboot now

Nice … so it simply wasn’t enabled or what? cgroup v2?

This

systemd.unified_cgroup_hierarchy=0

enables cgroups v1

Aaah sheize … that’s what it means of course. But, is it really a K3s specific thing … and not actually any Kubernetes distro?

the problem is that you need to be in either v1 or v2(unified) mode. Hybrid mode (where some are v1 and some are v2) does not work. In your case it sounds like the cpuset controller was still on v1 and the rest were on v2.

Aaaah yes. Makes sense.