Reset kubernetes master or work

Reinit

After run init, following error was occurred.

dial tcp 127.0.0.1:10248: connect: connection refused.

Run following command to reinit kubernetes master or worker

sudo mkdir /etc/docker
cat <<EOF | sudo tee /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF
sudo systemctl enable docker
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo kubeadm reset

Master

sudo kubeadm init

Worker

Join cluster

kubeadm join ...

Label it as worker

kubectl label node kworker1 node-role.kubernetes.io/worker=worker

Install Network Policy Provider

Following messages are printed to create pod network.

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Install Weave Net for NetworkPolicy.

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

References

Kubernetes kubeadm init fails due to dial tcp 127.0.0.1:10248: connect: connection refused
kubernetes cluster master node not ready
Weave Net for NetworkPolicy