docker-machine/docs/reference/rm.md

rm

Remove a machine. This will remove the local reference as well as delete it on the cloud provider or virtualization management platform.

$ docker-machine ls
NAME   ACTIVE   DRIVER       STATE     URL
foo0   -        virtualbox   Running   tcp://192.168.99.105:2376
foo1   -        virtualbox   Running   tcp://192.168.99.106:2376
$ docker-machine rm foo1
$ docker-machine ls
NAME   ACTIVE   DRIVER       STATE     URL
foo0   -        virtualbox   Running   tcp://192.168.99.105:2376