Set up external access to Docker (insecure)
#http://www.virtuallyghetto.com/2014/07/quick-tip-how-to-enable-docker-remote-api.html
# add line
# ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375
# to /lib/systemd/system/docker.service
sudo systemctl daemon-reload
sudo systemctl restart docker.service