Working with Kubernetes can be tricky, especially at the beginning. If you ever get stuck with a problem and can't resolve it, you can use kubeadm reset to reset everything related to our Kubernetes cluster, and start again from scratch:
$ sudo kubeadm reset[preflight] Running pre-flight checks.[reset] Stopping the kubelet service.[reset] Unmounting mounted directories in "/var/lib/kubelet"[reset] Removing kubernetes-managed containers.[reset] No etcd manifest found in "/etc/kubernetes/manifests/etcd.yaml". Assuming external etcd.[reset] Deleting contents of stateful directories: [/var/lib/kubelet /etc/cni/net.d /var/lib/dockershim /var/run/kubernetes][reset] Deleting contents of config directories: [/etc/kubernetes/manifests ...
