for containerd/cri please include note about /var/lib dir

[perezjasonr]

I noticed that there are notes about changing the parser to cri if you are using containerd or cri-o. but there is not an example manifest for it (daemonset, etc) and it doesn't say anywhere to also modify the volumes (i presume this is also not accounted for in the helm chart).

On a node running containerd as the runtime for k8s, there is no /var/lib/docker, but there is /var/lib/containerd, yet the ds will still mount (or try to) the docker dir.

ls -la /var/lib/docker
ls: cannot access '/var/lib/docker': No such file or directory
[root@ip-10-42-10-221 ~]# ls -la /var/lib/container*
/var/lib/containerd:
total 8
drwx------. 10 root root 4096 Jan 20 22:27 .
drwxr-xr-x. 30 root root 4096 Jan 20 22:27 ..
drwxr-xr-x.  3 root root   20 Jan 20 22:27 io.containerd.content.v1.content
drwx--x--x.  2 root root   21 Jan 20 22:27 io.containerd.metadata.v1.bolt
drwx--x--x.  2 root root    6 Jan 20 22:27 io.containerd.runtime.v1.linux
drwx--x--x.  2 root root    6 Jan 20 22:27 io.containerd.runtime.v2.task
drwxr-xr-x.  2 root root    6 Jan 20 22:27 io.containerd.snapshotter.v1.btrfs
drwx------.  3 root root   23 Jan 20 22:27 io.containerd.snapshotter.v1.native
drwx------.  3 root root   23 Jan 20 22:27 io.containerd.snapshotter.v1.overlayfs
drwx------.  2 root root    6 Jan 20 22:27 tmpmounts

/var/lib/containers:
total 4
drwxr-xr-x.  4 root root   37 Jan 20 22:27 .
drwxr-xr-x. 30 root root 4096 Jan 20 22:27 ..
drwxr-xr-x.  2 root root    6 Sep 23 16:19 sigstore
drwx------.  9 root root  169 Jan 20 22:27 storage

[z0rc]

AFAIK there is no need to mount /var/lib/containerd when running using cri runtime. /var/lib/docker mount point is needed when using dockerd runtime, because /var/log/containers/*.log are actually symlinks, real log files are in /var/lib/docker/containers/*/*.log.

With cri runtime /var/log/containers/*.log are still symlinks, but this time real files are in /var/log/pods/*.log.