查看证书到期时间
kubeadm alpha certs check-expiration
重置证书有效期一年
kubeadm alpha certs renew all
重启相关容器使证书生效
docker ps |grep -E 'k8s_kube-apiserver|k8s_kube-controller-manager|k8s_kube-scheduler|k8s_etcd_etcd' | awk -F ' ' '{print $1}' |xargs docker restart
替换原先kubeconfig
cp /etc/kubernetes/admin.conf /root/.kube/config
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