The Docker Machine driver for OpenNebula is ready for public use! Read how to deploy Docker containers here: http://opennebula.org/docker-machine-opennebula-plugin/. Give it a try and let us know what you think!
You might also be interested in reading the new post by Marco Mancini explaining how to use Docker Swarm with the OpenNebula Docker Machine driver plugin: http://opennebula.org/docker-swarm-with-opennebula/.