docker-machine create --driver virtualbox mgr1
docker-machine create --driver virtualbox wrk1
docker-machine create --driver virtualbox wrk2
docker-machine create --driver virtualbox wrk3
eval $(docker-machine env mgr1)
docker swarm init --advertise-addr 192.168.99.100
eval $(docker-machine env wrk1)
docker swarm join --token SWMTKN-1-6976trw9m8nfq7kzwggi5fav5jab9g4alzweujie1lx8351mea-alinzno5mexivjcmzqp9q8ons 192.168.99.100:2377