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+<h1><center>Kubernetes集群中Kubeadm证书到期问题</center></h1>
+
+作者：行癫（盗版必究）
+
+------
+
+## 一：报错案例
+
+#### 1.报错原因
+
+```shell
+[root@xingdiancloud-master ~]# kubectl get node
+E0706 14:10:17.193472 1056310 memcache.go:265] couldn't get current server API group list: the server has asked for the client to provide credentials
+E0706 14:10:17.194757 1056310 memcache.go:265] couldn't get current server API group list: the server has asked for the client to provide credentials
+E0706 14:10:17.196208 1056310 memcache.go:265] couldn't get current server API group list: the server has asked for the client to provide credentials
+E0706 14:10:17.197353 1056310 memcache.go:265] couldn't get current server API group list: the server has asked for the client to provide credentials
+E0706 14:10:17.198343 1056310 memcache.go:265] couldn't get current server API group list: the server has asked for the client to provide credentials
+error: You must be logged in to the server (the server has asked for the client to provide credentials)
+```
+
+![image-20240706141328064](https://xingdian-home.oss-cn-beijing.aliyuncs.com/imagesimage-20240706141328064.png)
+
+#### 2.解决方案
+
+检查当前证书的到期时间
+
+```shell
+kubeadm certs check-expiration
+```
+
+更新证书
+
+```shell
+kubeadm certs renew all
+```
+
+更新 kubeconfig 文件
+
+```shell
+sudo cp /etc/kubernetes/admin.conf $HOME/.kube/config
+sudo chown $(id -u):$(id -g) $HOME/.kube/config
+```
+
+更新证书后，需要重启控制平面组件以使新的证书生效
+
+```shell
+systemctl restart kubelet
+```
+