sudo yum install -y yum-utils   device-mapper-persistent-data   lvm2

sudo yum-config-manager     --add-repo     https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm  
sudo yum install containerd.io-1.2.6-3.3.el7.x86_64.rpm

sudo yum install docker-ce docker-ce-cli containerd.io

sudo gpasswd -a $USER docker     #将登陆用户加入到docker用户组中
newgrp docker     #更新用户组
docker ps    #测试docker命令是否可以使用sudo正常使用

sudo systemctl start docker  # 启动docker
docker run hello-world  #测试

sudo systemctl enable docker
sudo systemctl daemon-reload