http://www.runoob.com/docker/ubuntu-docker-install.html
1.选择国内的云服务商，这里选择阿里云为例
curl -sSL http://acs-public-mirror.oss-cn-hangzhou.aliyuncs.com/docker-engine/internet | sh -
2.安装所需要的包
sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
3.添加使用 HTTPS 传输的软件包以及 CA 证书
sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates
4.添加GPG密钥
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
5.添加软件源
echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" | sudo tee /etc/apt/sources.list.d/docker.list
6.添加成功后更新软件包缓存
sudo apt-get update
7.安装docker
sudo apt-get install docker-engine
8.启动 docker
sudo systemctl enable docker
sudo systemctl start docker