1、先添加k8s yum源

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

# yum makecache

2、查看并安装k8s客户端

# 如果之前安装过k8s，先卸载旧版本
yum remove -y kubelet kubeadm kubectl

# 查看可以安装的版本,只需要安装kubectl就可以了
yum list kubectl --showduplicates | sort -r
yum search kubelet --showduplicates | grep 'kubelet'|sort -r
yum install -y kubelet-1.25.2 kubeadm-1.25.2 kubectl-1.25.2