Is it possbile build image with containerd worker inside k8s pod?

[kunZooberg]

I have a host machine with containerd installed and running, then I start a pod mounting with /run/containerd/socket and its related state files (/var/lib/containerd, /run/containerd/containerd.socket .... )

I still got an error:
failed to create shim task: failed to mount rootfs component: no such file or directory: unknown

Do I need mount some layerfs device into pod?

[ademariag]

hey @kunZooberg did you solve this issue?
I'm experiencing the same

[hanikesn]

Interestingly I hit the exact same issue when running docker with containerd snapshotter and buildkit configured to use docker's containerd as worker

- --containerd-worker=true
- --containerd-worker-addr=/var/run/docker/containerd/containerd.sock

I also do mount /var/lib/docker/containerd as shared empty dir between dind and buildkitd.

EDIT: Turns out sharing /var/lib/buildkit will fix this issue.

[hanikesn]

Turns out to make it fully working you also need to use mount propagation for it to fully work:

          - name: buildkit
            mountPath: /var/lib/buildkit
            mountPropagation: Bidirectional