3.全部节点安装docker

$ yum -y install yum-utils -y
$ yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo # 设置源
$ yum -y install docker-ce-18.06.1.ce-3.el7 # 安装docker
$ systemctl enable docker && systemctl start docker # 启动docker
$ docker --version

$ cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://xgslkqss.mirror.aliyuncs.com"]
}
EOF

$ systemctl restart docker