https://docs.docker.com/engine/installation/linux/ubuntulinux/ https://docs.docker.com/engine/admin/systemd/
sudo apt-get install apt-transport-https ca-certificates -y
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
# create apt-sources file
# http://stackoverflow.com/a/550808
echo 'deb https://apt.dockerproject.org/repo ubuntu-xenial main' | sudo tee --append /etc/apt/sources.list.d/docker.list
sudo apt-get update
sudo apt-get install linux-image-extra-$(uname -r) -y
sudo apt-get install docker-engine -y
sudo service docker start
sudo docker run hello-world
# Modify admin user
sudo usermod -aG docker $USER