2. Install it.
3. Check version
$ docker -v
Docker version 1.0.0, build 63fe64c
4. Upgrade VM and start docker
$ boot2docker stop
$ boot2docker download
$ boot2docker start
$ docker run ubuntu echo hello world
Unable to find image 'ubuntu' locally
Pulling repository ubuntu
ad892dd21d60: Download complete
511136ea3c5a: Download complete
e465fff03bce: Download complete
23f361102fae: Download complete
9db365ecbcbb: Download complete
hello world
$ docker run ubuntu echo hello world
hello world
