删除节点

排空所有节点

kubectl cordon <node name>
kubectl drain --ignore-daemonsets --delete-local-data <node name>
kubectl delete node <node name>

重置状态

kubeadm reset 
systemctl stop kubelet
systemctl stop docker
rm -rf /var/lib/cni/
rm -rf /var/lib/kubelet/*
rm -rf /etc/cni/
ifconfig cni0 down
ifconfig flannel.1 down
ifconfig docker0 down
ip link delete cni0
ip link delete flannel.1
rm -rf $HOME/.kube /etc/kubernetes
iptables -t nat -F
ip link set docker0 down
ip link delete docker0
systemctl start docker