cgroup v2 without Systemd

[liyimeng]

I see many docs talk about configuring cgroup v2 using Systemd driver, almost nothing about running without Systemd.

In my case, I disable cgroupv1 in kernel and that mount /sys/fs/cgroup with init script, successfully make Containerd believe it is running on top of cgroupv2. However, it seem read out nothing from cgroup, e.g. it keep report zero cpu and memory usage.

What is the proper way to use cgroupv2 without Systemd?

[liyimeng]

I am not sure if this is Containerd problem. I open kubernetes/kubernetes#108364 and k3s-io/k3s#5133

Adding some debug info there.

[kolyshkin]

runc supports both systemd and "fs" (read/write cgroupfs) drivers for cgroup v2.