List all the docker machine:
docker-machine ls

Can check 'ip' and 'status':
docker-machine ip default
docker-machine status default

List the running container we have:
docker ps

Switch to another docker machine: defualt
docker-machine env default

List all the 'docker-machine' commons:
docker-machine

Start and stop the docker machine:
docker-machine stop default
docker-machine start default
