安装Docker

使用阿里云加速器安装

1. 确保本机没有旧版本的docker
   sudo yum remove docker docker-engine docker.io
2. 安装docker-engine, docker-ce
   curl -sSL http://acs-public-mirror.oss-cn-hangzhou.aliyuncs.com/docker-engine/internet | sh -
3. 添加镜像

   sudo mkdir -p /etc/docker
   sudo tee /etc/docker/daemon.json <<-'EOF'
   {
   "registry-mirrors": ["https://8difvy5w.mirror.aliyuncs.com"]
   }
   EOF
   sudo systemctl daemon-reload
   sudo systemctl restart docker