#確認憑證
kubeadm alpha certs check-expiration

#匯出設定
kubeadm config view > /root/kubeadm.yaml
更新憑證
kubeadm alpha certs renew all --config=/root/kubeadm.yaml
kubeadm alpha certs check-expiration

#刪除
rm -rf /root/kubeadm.yaml

#重啟
docker ps |grep -E 'k8s_kube-apiserver|k8s_kube-controller-manager|k8s_kube-scheduler|k8s_etcd_etcd' | awk -F ' ' '{print $1}' |xargs docker restart