在线安装

To install Docker Engine, you need a maintained version of CentOS 7 or 8 

参考文档 https://docs.docker.com/engine/install/centos/

1. 准备一台centos7以上的服务器
2. 清空环境

sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

　　3. 设置源

yum install -y yum-utils
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

　　4. 安装docker引擎

yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io

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

　　5. 启动docker

systemctl start docker

　　6. docker服务自启

systemctl enable docker

　　7. 检查docker状态

systemctl status docker

　　8. 测试docker

docker run hello-world