问题场景：

我是因为虚拟机，挂起了几天，再打开join节点的时候报错：

• 证书过期报错

...其他输出
I0427 15:33:56.626776   93338 token.go:215] [discovery] Failed to request cluster-info, will try again: Get "https://192.168.1.100:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s": x509: certificate has expired or is not yet valid: current time 2024-04-27T15:33:56+08:00 is before 2024-04-27T12:26:15Z

certificate has expired or is not yet valid: current time 就是指的证书过期，而且是master的证书过期。

解决办法：

检查各个证书是否真的过期

[root@master pki]# kubeadm alpha certs check-expiration
CERTIFICATE                EXPIRES                  RESIDUAL TIME   CERTIFICATE AUTHORITY   EXTERNALLY MANAGED
admin.conf                 Apr 27, 2025 12:59 UTC   364d                                    no
apiserver                  Apr 27, 2025 13:05 UTC   364d            ca                      no
apiserver-etcd-client      Apr 27, 2025 12:26 UTC   364d            etcd-ca                 no
apiserver-kubelet-client   Apr 27, 2025 12:59 UTC   364d            ca                      no
controller-manager.conf    Apr 27, 2025 12:59 UTC   364d                                    no
etcd-healthcheck-client    Apr 27, 2025 12:26 UTC   364d            etcd-ca                 no
etcd-peer                  Apr 27, 2025 12:26 UTC   364d            etcd-ca                 no
etcd-server                Apr 27, 2025 12:26 UTC   364d            etcd-ca                 no
front-proxy-client         Apr 27, 2025 12:59 UTC   364d            front-proxy-ca          no
scheduler.conf             Apr 27, 2025 12:59 UTC   364d                                    noCERTIFICATE AUTHORITY   EXPIRES                  RESIDUAL TIME   EXTERNALLY MANAGED
ca                      Apr 25, 2034 12:26 UTC   9y              no
etcd-ca                 Apr 25, 2034 12:26 UTC   9y              no
front-proxy-ca          Apr 25, 2034 12:26 UTC   9y              no

我这里显示是没有过期的

如果没有过期就同步各个服务器的时间，一般安装k8s都有装ntpdate没有的话自行安装

[root@master pki]# ntpdate time.windows.com
# 或者
[root@master pki]# ntpdate pool.ntp.org

如果过期了，就刷新重新刷新证书（全部）并重启Docker容器内容和K8S

[root@master pki]# kubeadm alpha certs renew all
[root@master pki]# docker ps |grep kube-apiserver|grep -v pause|awk '{print $1}'|xargs -i docker restart {}
[root@master pki]# docker ps |grep kube-controller-manage|grep -v pause|awk '{print $1}'|xargs -i docker restart {}
[root@master pki]# docker ps |grep kube-scheduler|grep -v pause|awk '{print $1}'|xargs -i docker restart {}
[root@master pki]# systemctl restart kubelet