docker-machine create -d virtualbox manager
docker-machine create -d virtualbox agent1
docker-machine create -d virtualbox agent2
eval $(docker-machine env manager)
docker run --rm swarm create
docker-machine ls
docker run -d -p 3376:3376 -t -v /var/lib/boot2docker:/certs:ro \
swarm manage -H 0.0.0.0:3376 \