support for containerd kubernetes

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Seems we can not run kubernetes natively on unraid if we don't enable docker.

I would like to separate docker containers from kubernetes containers, if I run k3s automatically configure a containerd instance

but I got this error.

ERRO[2021-05-29T20:59:52.102559272+02:00] RunPodSandbox for &PodSandboxMetadata{Name:metrics-server-86cbb8457f-cszbj,Uid:89b03757-5da6-4d20-a140-9544f5c940db,Namespace:kube-system,Attempt:0,} failed, error  error="failed to create containerd task: OCI runtime create failed: container_linux.go:367: starting container process caused: process_linux.go:495: container init caused: rootfs_linux.go:118: jailing process inside rootfs caused: pivot_root invalid argument: unknown"


Seems something is missing in unraid OS, maybe someone can help me to discover what is missing.

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