CentOS7 Docker 安裝

• yum -y install docker-io
• service docker start
• docker run hello-world
• 配置阿里加速器：

sudo sed -i "s|ExecStart=/usr/bin/dockerd|ExecStart=/usr/bin/dockerd --registry-mirror=加速器地址|g" /etc/systemd/system/docker.service
sudo systemctl daemon-reload
sudo service docker restart```