k3s check-config fails on pure cgroups v2 systems without legacy controllers

[ricardobranco777]

K3s Version:
k3s version v1.31.4+k3s1 (a562d09)
go version go1.22.9

Node(s) CPU architecture, OS, and Version:
Linux jeos 6.13.0-1-default #1 SMP PREEMPT_DYNAMIC Mon Jan 20 07:26:08 UTC 2025 (1513344) x86_64 x86_64 x86_64 GNU/Linux

k3s check-config fails on pure cgroups v2 systems without legacy controllers:

- CONFIG_CGROUP_CPUACCT: missing (fail)
- CONFIG_CGROUP_DEVICE: missing (fail)
- CONFIG_CGROUP_FREEZER: missing (fail)

Steps To Reproduce:

• Installed K3s:

curl -sfL https://get.k3s.io  -o install_k3s.sh
sh install_k3s.sh --disable=metrics-server --disable-helm-controller --disable=traefik

Expected behavior:
No failures.

Actual behavior:
Fails on legacy controllers.

[brandond]

I don't know what jeos is but it looks like you are in fact missing some cgroup controllers. CPUACCT, DEVICE, and FREEZER are not legacy as far as I know.

[ricardobranco777]

I don't know what jeos is but it looks like you are in fact missing some cgroup controllers. CPUACCT, DEVICE, and FREEZER are not legacy as far as I know.

JeOS is openSUSE Tumbleweed.

[brandond]

OK well I guess it doesn't provide "just enough" cgroup controllers.