sudo apt-get update  
sudo apt-get install apt-transport-https ca-certificates  
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" | sudo tee /etc/apt/sources.list.d/docker.list
sudo apt-get update
apt-cache policy docker-engine

sudo apt-get remove docker docker-engine
sudo apt-get install docker-engine
sudo docker -v

gitolite
php7-nginx-yaf
nginx-openssl-1.0.2
...

echo "DOCKER_OPTS=\"\$DOCKER_OPTS --registry-mirror=http://hub-mirror.c.163.com\"" | sudo tee -a /etc/default/docker
sudo service docker restart