See which machine is “active” (a machine is considered active if the
DOCKER_HOST environment variable points to it).
$ docker-machine ls NAME ACTIVE DRIVER STATE URL dev - virtualbox Running tcp://192.168.99.103:2376 staging * digitalocean Running tcp://203.0.113.81:2376 $ echo $DOCKER_HOST tcp://203.0.113.81:2376 $ docker-machine active staging
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