使用kubeadm部署的集群证书过期后处理
之前使用 kubeadm 部署的集群，突然有一天执行 kubectl get pod 提示：1
Unable to connect to the server: x509: certificate has expired or is not yet valid: current time 2024-03-04T14:26:31+08:00 is after 2024-02-27T08:36:50Z
意思是证书有效期到 2024-02-27T08:36:50Z， 已经超过了证书有效期了。
查看证书有效期
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
# kubeadm certs check-expiration
Reading configuration from the cluster...
FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
Error reading configuration from the Cluster. Falling back to default configuration
CERTIFICATE EXPIRES RESIDUAL TIME CERTIFICATE AUTHORITY EXTERNALLY MANAGED
admin.conf Feb 27, 2024 08:36 UTC ca no
apiserver Feb 27, 2024 08:36 UTC ca no
apiserver-etcd-client Feb 27, 2024 08:36 UTC etcd-ca no
apiserver-kubelet-client Feb 27, 2024 08:36 UTC ca no
controller-manager.conf Feb 27, 2024 08:36 UTC ca no
etcd-healthcheck-client Feb 27, 2024 08:36 UTC etcd-ca no
etcd-peer Feb 27, 2024 08:36 UTC etcd-ca no
etcd-server Feb 27, 2024 08:36 UTC etcd-ca no
front-proxy-client Feb 27, 2024 08:36 UTC front-proxy-ca no
scheduler.conf Feb 27, 2024 08:36 UTC ca no
CERTIFICATE AUTHORITY EXPIRES RESIDUAL TIME EXTERNALLY MANAGED
ca Feb 24, 2033 08:36 UTC 8y no
etcd-ca Feb 24, 2033 08:36 UTC 8y no
front-proxy-ca Feb 24, 2033 08:36 UTC 8y no
执行续期操作
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
# kubeadm certs renew all
Reading configuration from the cluster...
FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
Error reading configuration from the Cluster. Falling back to default configuration
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
Done 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 kubectl 配置
如果当时安装的时候是通过 cp /etc/kubernetes/admin.conf ~/.kube/config 复制的配置，需要再更新一遍，管理员也可以指定使用 /etc/kubernetes/admin.conf 作为 kubeconfig，就不用每次更新了。
重启服务
需要重启 kube-apiserver, kube-controller-manager, kube-scheduler 和 etcd， kubeadm 安装的 kubelet 会自动更新证书，所以不用重启。
1
crictl pods --namespace kube-system --name 'kube-scheduler-*|kube-controller-manager-*|kube-apiserver-*|etcd-*' -q | xargs crictl rmp -f
1
2
docker ps
docker restart xxx
页:
[1]