在每一个node上执行下列脚本：

sudo kubeadm reset

sudo apt purge kubectl kubeadm kubelet kubernetes-cni -y
sudo apt autoremove
sudo rm -fr /etc/kubernetes/; sudo rm -fr ~/.kube/; sudo rm -fr /var/lib/etcd; sudo rm -rf /var/lib/cni/

sudo systemctl daemon-reload

sudo iptables -F && sudo iptables -t nat -F && sudo iptables -t mangle -F && sudo iptables -X

# remove all running docker containers
docker rm -f `docker ps -a | grep "k8s_" | awk '{print $1}'`

引用 https://www.thinbug.com/q/44698283