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一、 问题表现
使用kubelet get node后报错,x509: certificate has expired or is not yet valid,提示证书过期。
[root@master ~]# kubectl get node
Unable to connect to the server: x509: certificate has expired or is not yet valid: current time 2023-02-17T09:56:22+08:00 is after 2023-01-12T10:42:07Z
二、 问题排查
集群是由kubeadm创建。但是它创建的apiserver、controller-manager等证书默认只有一年的有效期，同时kubelet 证书也只有一年有效期，一年之后kubernetes将停止服务。
官方文档:
https://kubernetes.io/zh-cn/docs/tasks/administer-cluster/kubeadm/kubeadm-certs/
你可以使用 check-expiration 子命令来检查证书何时过期
kubeadm certs check-expiration
输出类似于以下内容：
CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED
admin.conf Dec 28, 2023 05:54 UTC <invalid> no
apiserver Dec 28, 2023 05:54 UTC <invalid> ca no
apiserver-etcd-client Dec 28, 2023 05:54 UTC <invalid> etcd-ca no
apiserver-kubelet-client Dec 28, 2023 05:54 UTC <invalid> ca no
controller-manager.conf Dec 28, 2023 05:54 UTC <invalid> no
etcd-healthcheck-client Dec 28, 2023 05:54 UTC <invalid> etcd-ca no
etcd-peer Dec 28, 2023 05:54 UTC <invalid> etcd-ca no
etcd-server Dec 28, 2023 05:54 UTC <invalid> etcd-ca no
front-proxy-client Dec 28, 2023 05:54 UTC <invalid> front-proxy-ca no
scheduler.conf Dec 28, 2023 05:54 UTC <invalid> no CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED
ca Dec 25, 2032 05:54 UTC 8y no
etcd-ca Dec 25, 2032 05:54 UTC 8y no
front-proxy-ca Dec 25, 2032 05:54 UTC 8y no
三、 问题解决
1. 查看证书到期时间
# 查看证书到期时间
kubeadm certs check-expiration
2. 更新自签证书
#更新自签证书
kubeadm certs renew all
3. 查看最新时间
#查看最新时间
[root@pkm-04 kubernetes]# kubeadm certs check-expiration
[check-expiration] Reading configuration from the cluster...
[check-expiration] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED
admin.conf Dec 27, 2024 10:52 UTC 364d no
apiserver Dec 27, 2024 10:52 UTC 364d ca no
apiserver-etcd-client Dec 27, 2024 10:52 UTC 364d etcd-ca no
apiserver-kubelet-client Dec 27, 2024 10:52 UTC 364d ca no
controller-manager.conf Dec 27, 2024 10:52 UTC 364d no
etcd-healthcheck-client Dec 27, 2024 10:52 UTC 364d etcd-ca no
etcd-peer Dec 27, 2024 10:52 UTC 364d etcd-ca no
etcd-server Dec 27, 2024 10:52 UTC 364d etcd-ca no
front-proxy-client Dec 27, 2024 10:52 UTC 364d front-proxy-ca no
scheduler.conf Dec 27, 2024 10:52 UTC 364d no CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED
ca Dec 25, 2032 05:54 UTC 8y no
etcd-ca Dec 25, 2032 05:54 UTC 8y no
front-proxy-ca Dec 25, 2032 05:54 UTC 8y no
4.复制配置
#复制配置
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
5.重启kubelet,docker（master与node都要重启）
#重启kubelet,docker（master与node都要重启）
systemctl restart docker
systemctl restart kubelet
参考资料：
https://www.cnblogs.com/cerberus43/p/17130266.html
https://kubernetes.io/zh-cn/docs/tasks/administer-cluster/kubeadm/kubeadm-certs/
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