Reset K8S Node

reset-k8s-node.sh

echo -n "Really want to reset this node? (y/N): "
read -r check

if [[ "$check" = "y" ]]; then
  echo "[INFO] Reset kubeadm"
  kubeadm reset -f
  echo "[INFO] Stop kubelet & docker service"
  systemctl stop kubelet docker docker.socket
  echo "[INFO] Remove K8S files"
  rm -rvf /etc/kubernetes/*
  rm -rvf /var/lib/kubelet/*
  rm -rvf /var/lib/etcd/
  echo "[INFO] Remove K8S network files"
  rm -rf /var/run/calico/ /var/lib/calico/ /etc/cni/ /var/lib/cni/
  ifconfig cni0 down
  ifconfig flannel.1 down
  ifconfig tunl0 down
  ip link delete cni0
  ip link delete flannel.1
  ip link delete tunl0
  ip link delete cilium_host
  ip link delete cilium_vxlan
  echo "[INFO] Restart docker"
  systemctl restart docker
  
  echo "[INFO] Done. You have to delete the node from your k8s with 'kubectl delete node $(hostname)'"
else
  echo "[INFO] Cancel."
fi

Add ip link deletion for Cilium

  ip link delete cilium_host
  ip link delete cilium_vxlan