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Found multiple CRI sockets, please use --cri-socket to select one: /var/run/dockershim.sock, /var/run/crio/crio.sock

Posted at

Init a kubernetes cluster with cri-socket /var/run/crio/crio.sock, when run kubeadm reset, got these error:

Found multiple CRI sockets, please use --cri-socket to select one: /var/run/dockershim.sock, /var/run/crio/crio.sock

Reason

kubeadm detect known cri sock by finding sock file in fs( https://github.com/kubernetes/kubernetes/blob/8eda21ea3f1c2a95581e8b48b6333d600e7ecda4/cmd/kubeadm/app/util/runtime/runtime.go#L196-L229 ), if you having docker running too, you will get this error.

How to resolve?

Stop docker and delete /var/run/docker.sock:

rm -rf /var/run/docker.sock 
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