kubeadm更新证书（1.23.4版本）

1、查看证书到期时间

kubeadm certs check-expiration

1.1、输出如下内容

[root@master pki]# 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                 Mar 15, 2023 12:07 UTC   335d            ca                      no      
apiserver                  Mar 15, 2023 12:07 UTC   335d            ca                      no      
apiserver-etcd-client      Mar 15, 2023 12:07 UTC   335d            etcd-ca                 no      
apiserver-kubelet-client   Mar 15, 2023 12:07 UTC   335d            ca                      no      
controller-manager.conf    Mar 15, 2023 12:07 UTC   335d            ca                      no      
etcd-healthcheck-client    Mar 15, 2023 12:07 UTC   335d            etcd-ca                 no      
etcd-peer                  Mar 15, 2023 12:07 UTC   335d            etcd-ca                 no      
etcd-server                Mar 15, 2023 12:07 UTC   335d            etcd-ca                 no      
front-proxy-client         Mar 15, 2023 12:07 UTC   335d            front-proxy-ca          no      
scheduler.conf             Mar 15, 2023 12:07 UTC   335d            ca                      no      

CERTIFICATE AUTHORITY   EXPIRES                  RESIDUAL TIME   EXTERNALLY MANAGED
ca                      Mar 12, 2032 12:07 UTC   9y              no      
etcd-ca                 Mar 12, 2032 12:07 UTC   9y              no      
front-proxy-ca          Mar 12, 2032 12:07 UTC   9y              no      

该命令显示了 所有证书的到期/剩余时间，包括在etc/kubernetes/pki目录下的客户端证书及由kubeadm嵌入到KUBECONFIG文件中的客户端证书（admin.conf，controller-manager.conf和scheduler.conf）

2、手动续订证书
使用 kubeadm certs renew 命令 可以随时手动续订证书，该命令使用存储在/etc/kubernetes/pki中的 CA (or front-proxy-CA)证书和密钥来更新证书
2.1、查看 kubeadm certs renew 帮助信息

[root@master pki]# kubeadm certs renew -h
This command is not meant to be run on its own. See list of available subcommands.

Usage:
  kubeadm certs renew [flags]
  kubeadm certs renew [command]

Available Commands:
  admin.conf               Renew the certificate embedded in the kubeconfig file for the admin to use and for kubeadm itself
  all                      Renew all available certificates
  apiserver                Renew the certificate for serving the Kubernetes API
  apiserver-etcd-client    Renew the certificate the apiserver uses to access etcd
  apiserver-kubelet-client Renew the certificate for the API server to connect to kubelet
  controller-manager.conf  Renew the certificate embedded in the kubeconfig file for the controller manager to use
  etcd-healthcheck-client  Renew the certificate for liveness probes to healthcheck etcd
  etcd-peer                Renew the certificate for etcd nodes to communicate with each other
  etcd-server              Renew the certificate for serving etcd
  front-proxy-client       Renew the certificate for the front proxy client
  scheduler.conf           Renew the certificate embedded in the kubeconfig file for the scheduler manager to use

Flags:
  -h, --help   help for renew

Global Flags:
      --add-dir-header           If true, adds the file directory to the header of the log messages
      --log-file string          If non-empty, use this log file
      --log-file-max-size uint   Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
      --one-output               If true, only write logs to their native severity level (vs also writing to each lower severity level)
      --rootfs string            [EXPERIMENTAL] The path to the 'real' host root filesystem.
      --skip-headers             If true, avoid header prefixes in the log messages
      --skip-log-headers         If true, avoid headers when opening log files
  -v, --v Level                  number for the log level verbosity

Use "kubeadm certs renew [command] --help" for more information about a command.

说明：如上所知，指定某个证书就能续订该证书，指定 all 则续订所有证书。

2.2、命令执行后，注意：

• 无论证书的到期时间如何，都会无条件地续订一年。
• 证书的SAN等信息基于原证书，无需再次提供。
• renew执行后，为使更改生效，需要重启各组件。

说明：kubeadm certs命令仅支持v1.15及其以上的版本
2.3、手动续订所有证书
2.3.1、备份源文件及执行证书更新命令

[root@master ~]# cp -r /etc/kubernetes /etc/kubernetes.bak
[root@master ~]# kubeadm 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 -o yaml'

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 tha

2.4、查看新证书文件

[root@master ~]# ll /etc/kubernetes
总用量 36
-rw-------. 1 root root 5639 4月  14 14:48 admin.conf
-rw-------. 1 root root 5671 4月  14 14:48 controller-manager.conf
-rw-------. 1 root root 1963 3月  15 20:07 kubelet.conf
drwxr-xr-x. 2 root root  113 3月  22 10:24 manifests
drwxr-xr-x. 3 root root 4096 3月  15 20:07 pki
drwxr-xr-x. 3 root root 4096 4月  14 14:37 pki.old
-rw-------. 1 root root 5619 4月  14 14:48 scheduler.conf
[root@master ~]# ll /etc/kubernetes/pki
总用量 56
-rw-r--r--. 1 root root 1281 4月  14 14:48 apiserver.crt
-rw-r--r--. 1 root root 1155 4月  14 14:48 apiserver-etcd-client.crt
-rw-------. 1 root root 1675 4月  14 14:48 apiserver-etcd-client.key
-rw-------. 1 root root 1675 4月  14 14:48 apiserver.key
-rw-r--r--. 1 root root 1164 4月  14 14:48 apiserver-kubelet-client.crt
-rw-------. 1 root root 1679 4月  14 14:48 apiserver-kubelet-client.key
-rw-r--r--. 1 root root 1099 3月  15 20:07 ca.crt
-rw-------. 1 root root 1679 3月  15 20:07 ca.key
drwxr-xr-x. 2 root root  162 3月  15 20:07 etcd
-rw-r--r--. 1 root root 1115 3月  15 20:07 front-proxy-ca.crt
-rw-------. 1 root root 1679 3月  15 20:07 front-proxy-ca.key
-rw-r--r--. 1 root root 1119 4月  14 14:48 front-proxy-client.crt
-rw-------. 1 root root 1675 4月  14 14:48 front-proxy-client.key
-rw-------. 1 root root 1675 3月  15 20:07 sa.key
-rw-------. 1 root root  451 3月  15 20:07 sa.pub

2.5、再次查看证书有效期

[root@master ~]# 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                 Apr 14, 2023 06:48 UTC   364d            ca                      no      
apiserver                  Apr 14, 2023 06:48 UTC   364d            ca                      no      
apiserver-etcd-client      Apr 14, 2023 06:48 UTC   364d            etcd-ca                 no      
apiserver-kubelet-client   Apr 14, 2023 06:48 UTC   364d            ca                      no      
controller-manager.conf    Apr 14, 2023 06:48 UTC   364d            ca                      no      
etcd-healthcheck-client    Apr 14, 2023 06:48 UTC   364d            etcd-ca                 no      
etcd-peer                  Apr 14, 2023 06:48 UTC   364d            etcd-ca                 no      
etcd-server                Apr 14, 2023 06:48 UTC   364d            etcd-ca                 no      
front-proxy-client         Apr 14, 2023 06:48 UTC   364d            front-proxy-ca          no      
scheduler.conf             Apr 14, 2023 06:48 UTC   364d            ca                      no      

CERTIFICATE AUTHORITY   EXPIRES                  RESIDUAL TIME   EXTERNALLY MANAGED
ca                      Mar 12, 2032 12:07 UTC   9y              no      
etcd-ca                 Mar 12, 2032 12:07 UTC   9y              no      
front-proxy-ca          Mar 12, 2032 12:07 UTC   9y              no      

3、重启 kube-apiserver、kube-controller-manager、kube-scheduler、etcd 组件后生效
3.1、重启方法1：

[root@master ~]# mv /etc/kubernetes/manifests/* /tmp/
//约等30秒后 kube-apiserver、kube-controller-manager、kube-scheduler、etcd 容器会停止，然后，再将清单文件移过来：
[root@master ~]# mv /tmp/kube-* /etc/kubernetes/manifests/
[root@master ~]# mv /tmp/etcd.yaml /etc/kubernetes/manifests/

3.2、重启方法2：

[root@master ~]# kubectl delete pod etcd-master -n kube-system
[root@master ~]# kubectl delete pod kube-apiserver-master -n kube-system
[root@master ~]# kubectl delete pod kube-controller-manager-master -n kube-system
[root@master ~]# kubectl delete pod kube-scheduler-master -n kube-system

4、修改config文件

[root@master ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@master ~]# chown $(id -u):$(id -g) $HOME/.kube/config

最后

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