三台机器都得输入
yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine
三台机器都得下载
yum install -y yum-utils \ device-mapper-persistent-data \ lvm2 yum-config-manager \ --add-repo \ https://download.docker.com/linux/centos/docker-ce.repo yum install -y docker-ce docker-ce-cli containerd.io 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 install -y kubelet-1.17.3 kubeadm-1.17.3 kubectl-1.17.3
