[release-1.25] Containerd aufs/devmapper/zfs snapshotters removed from May 2023 releases

[brandond]

• Containerd aufs/devmapper/zfs snapshotters removed from May 2023 releases #7660 backport

[mdrahman-suse]

Tested on RC v1.25.11-rc1+k3s1

• config.yaml

write-kubeconfig-mode: 644
token: summerheat
disable:
  - servicelb
  - traefik
prefer-bundled-bin: true
snapshotter: zfs

Unable to replicate the issue on v1.25.10+k3s1 but replicated the issue in v1.26.5+k3s1 (upgraded from 1.25)
Observed the expected behavior in v1.25.11-rc1+k3s1 and after upgrading to v1.26.6-rc1+k3s1

• zfs/auf/devmapper plugins are visible on search (zfs skip due to non-zfs filesystem)

ubuntu@test:~$ sudo ctr plugin ls | grep snapshotter
io.containerd.snapshotter.v1           aufs                     linux/amd64    skip
io.containerd.snapshotter.v1           btrfs                    linux/amd64    skip
io.containerd.snapshotter.v1           native                   linux/amd64    ok
io.containerd.snapshotter.v1           overlayfs                linux/amd64    ok
io.containerd.snapshotter.v1           fuse-overlayfs           linux/amd64    ok
io.containerd.snapshotter.v1           stargz                   linux/amd64    ok
io.containerd.snapshotter.v1           devmapper                linux/amd64    error
io.containerd.snapshotter.v1           zfs                      linux/amd64    skip

ubuntu@test:~$ sudo grep type=io.containerd.snapshotter.v1 /var/lib/rancher/k3s/agent/containerd/containerd.log |grep plugin
time="2023-06-16T13:32:38.187436244Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.aufs\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207182998Z" level=info msg="skip loading plugin \"io.containerd.snapshotter.v1.aufs\"..." error="aufs is not supported (modprobe aufs failed: exit status 1 \"modprobe: module aufs not found in modules.dep\\n\"): skip plugin" type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207225128Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.btrfs\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207496077Z" level=info msg="skip loading plugin \"io.containerd.snapshotter.v1.btrfs\"..." error="path /var/lib/rancher/k3s/agent/containerd/io.containerd.snapshotter.v1.btrfs (ext4) must be a btrfs filesystem to be used with the btrfs snapshotter: skip plugin" type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207600384Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.native\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207667494Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.overlayfs\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207905656Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.fuse-overlayfs\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.207988015Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.stargz\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.211261949Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.devmapper\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.211320333Z" level=info msg="loading plugin \"io.containerd.snapshotter.v1.zfs\"..." type=io.containerd.snapshotter.v1
time="2023-06-16T13:32:38.211527409Z" level=info msg="skip loading plugin \"io.containerd.snapshotter.v1.zfs\"..." error="path /var/lib/rancher/k3s/agent/containerd/io.containerd.snapshotter.v1.zfs must be a zfs filesystem to be used with the zfs snapshotter: skip plugin" type=io.containerd.snapshotter.v1