1. 安装/升级Docker客户端
    2. 配置镜像加速器
      1. sudo mkdir -p /etc/docker
      2. sudo tee /etc/docker/daemon.json <<-'EOF'
      3. {
      4. "registry-mirrors": ["https://3030z2y8.mirror.aliyuncs.com"]
      5. }
      6. EOF
      7. sudo systemctl daemon-reload
      8. sudo systemctl restart docker