Kubenetes更新证书

一、查看证书过期的时间

kubeadm certs check-expiration

二、证书备份

cp -rp /etc/kubernetes/ /etc/kubernetes.20230320

增加配置文件

输出默认配置
kubeadm config print init-defaults

vim ~/kubeadm.yaml

apiVersion: kubeadm.k8s.io/v1beta3
kind: ClusterConfiguration
kubernetesVersion: v1.23.0 #这里改成你集群对应的版本
imageRepository: registry.aliyuncs.com/google_containers 
#这里使用国内的镜像仓库，否则在重新签发的时候会报错：could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt"

三、重新生成证书

kubeadm certs renew all --config=~/kubeadm.yaml

四、重新生成配置文件

mkdir /etc/kubernetes/conf.20230320
mv /etc/kubernetes/*.conf /etc/kubernetes/conf.20230320

kubeadm init phase kubeconfig all --config=~/kubeadm.yaml

五、重启kubelet和更新配置

systemctl restart kubelet

cp /etc/kubernetes/admin.conf ~/.kube/config