From slack conversation with @StefanScherer :

I've added the Ubuntu 19.10 machine, you can use label ubuntu-1910 or ubuntu-1910-overlay2 to select this os version. Kernel parameter is set.

So, we can work on having CI running (I'll clean up #40094, and see if I can use that as base, as we may need custom containerd/runc versions for testing)

Keeping this issue open seems to have caused confusion that as if cgroup2 isn't supported yet, so I'm closing this one.

What we really still lack is just CI infra for cgroup2

To people who came here: cgroup2 is supported when you run Docker 20 + containerd 1.4 + runc 1.0-rc91.

Docker 20 isn't officially released yet, and its ETA is still unpublished

EDIT: Docker 20.10.0-beta1 is available now: curl -fsSL https://get.docker.com | CHANNEL=test sh

Hi, I've succeeded to install docker 20.10.0-rc2 by the above method.

dockerd -v

Docker version 20.10.0-rc2, build ca520bd

However, I still encountered the cgroup issue:
ERRO[2020-12-03T07:56:40.528810125Z] Handler for POST /v1.41/containers/7279876e003f70939afc4b286b0379777355f270be7d801a65d350a49900e9f9/start returned error: OCI runtime create failed: container_linux.go:370: starting container process caused: process_linux.go:326: applying cgroup configuration for process caused: open /sys/fs/cgroup/cpuset/docker/cpuset.cpus: no such file or directory: unknown

What's wrong? Do I need any config to tell dockerd to use cgroup2? Thanks!

@cwhuang Please fulfill https://github.com/moby/moby/blob/master/.github/ISSUE_TEMPLATE.md and open a new issue . Also please make sure you have containerd >= 1.4 and runc >= 1.0-rc91.