安装步骤：

    1. 下载docker-ce的repo

      1. curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

    2. 安装依赖（这是相比centos7的关键步骤）

      1. yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm
    3. 安装docker-ce
      1. yum install docker-ce
      4.启动docker
      1. systemctl start docker
    4. 开机启动docker
      1. systemctl enable docker
      6.安装docker-compose
      1. sudo curl -L "https://github.com/docker/compose/releases/download/1.25.5/docker-compose-(uname -m)" -o /usr/local/bin/docker-compose
      7.添加操作权限
      1. sudo chmod +x /usr/local/bin/docker-compose
      8.设置快捷
      1. sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
      9.查看docker-compose 版本
      1. docker-compose --version