kubeadm搭建集群怎么更新证书
master节点查看证书有效期
# kubeadm certs check-expiration
[check-expiration] Reading configuration from the "kubeadm-config" ConfigMap in namespace "kube-system"...
[check-expiration] Use 'kubeadm init phase upload-config --config your-config-file' to re-upload it.CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED
admin.conf Jan 27, 2027 07:24 UTC 363d ca no
apiserver Jan 28, 2027 03:10 UTC 363d ca no
apiserver-etcd-client Jan 27, 2027 07:24 UTC 363d etcd-ca no
apiserver-kubelet-client Jan 27, 2027 07:24 UTC 363d ca no
controller-manager.conf Jan 27, 2027 07:24 UTC 363d ca no
etcd-healthcheck-client Jan 27, 2027 07:24 UTC 363d etcd-ca no
etcd-peer Jan 27, 2027 07:24 UTC 363d etcd-ca no
etcd-server Jan 27, 2027 07:24 UTC 363d etcd-ca no
front-proxy-client Jan 27, 2027 07:24 UTC 363d front-proxy-ca no
scheduler.conf Jan 27, 2027 07:24 UTC 363d ca no
super-admin.conf Jan 27, 2027 07:24 UTC 363d ca no CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED
ca Jan 25, 2036 07:24 UTC 9y no
etcd-ca Jan 25, 2036 07:24 UTC 9y no
front-proxy-ca Jan 25, 2036 07:24 UTC 9y no
root@Ubuntu22K8SMaster003151:~#
更新证书
# kubeadm certs renew all
[renew] Reading configuration from the "kubeadm-config" ConfigMap in namespace "kube-system"...
[renew] Use 'kubeadm init phase upload-config --config your-config-file' to re-upload it.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
certificate embedded in the kubeconfig file for the super-admin renewedDone renewing certificates. You must restart the kube-apiserver, kube-controller-manager, kube-scheduler and etcd, so that they can use the new certificates.
更新kubeconfig配置文件
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
如果 kube-proxy 等组件也需要新证书，可以
sudo kubeadm init phase kubeconfig all
更新完证书后，需要让 API Server、Controller Manager、Scheduler 等加载新证书，可以直接重启 kubelet，kubelet 会重新启动这些静态 Pod：