K8S 部署及更新升级

增加节点
kubeadm token create --print-join-command
安装指定版本
yum list kubeadm --showduplicates | sort -r

yum -y install kubeadm-1.20.12-0 kubectl-1.20.12-0 kubelet-1.20.12-0

kubeadm部署1.21之后的版本，如果运行时是docker,需要修改docker配置文件增加
"exec-opts": ["native.cgroupdriver=systemd"]
参数
kubeadm config images list --image-repository=registry.aliyuncs.com/google_containers

cat > cat /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF