目录

证书一年过期了

kubectl get nodes

Unable to connect to the server: x509: certificate has expired or is not yet valid

查看API服务器的证书日期

  • 方法1 
    openssl x509 -in /etc/kubernetes/pki/apiserver.crt -noout -text|grep -A2 'Validity'

          Validity
          Not Before: Jun 16 06:09:07 2020 GMT
          Not After : Jun 16 06:09:07 2021 GMT
  • 方法2 
    openssl x509 -in /etc/kubernetes/pki/apiserver.crt -noout -text|grep ' Not '

              Not Before: Jun 16 06:09:07 2020 GMT
          Not After : Jun 16 06:09:07 2021 GMT

重新配置证书

sudo kubeadm alpha certs renew all

[renew] Reading configuration from the cluster...
[renew] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[renew] Error reading configuration from the Cluster. Falling back to default configuration

W0621 09:15:13.565535 1745938 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
certificate embedded in the kubeconfig file for the admin to use and for kubeadm itself renewed
certificate for serving the Kubernetes API renewed
certificate the apiserver uses to access etcd renewed
certificate for the API server to connect to kubelet renewed
certificate embedded in the kubeconfig file for the controller manager to use renewed
certificate for liveness probes to healthcheck etcd renewed
certificate for etcd nodes to communicate with each other renewed
certificate for serving etcd renewed
certificate for the front proxy client renewed
certificate embedded in the kubeconfig file for the scheduler manager to use renewed

复制配置到当前用户

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

重启服务

sudo systemctl daemon-reload && sudo systemctl restart kubelet

参考资料