docker安装文档参考:https://docs.docker.com/engine/install/centos/
1、安装阿里yum源:
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
2、安装docker
sudo yum install docker-ce-19.03.12 docker-ce-cli-19.03.12 containerd.io
3、docker启动
systemctl start docker
4、设置docker 开机自启
systemctl enable docker