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Re:Ask HN: Best practices for OS X dev environments by Jean-Philipe on Saturday February 14, 2015 @09:38AM (#9049728)
Docker is not a VM and only works on Linux.
Re:Ask HN: Best practices for OS X dev environments by billdstrong on Monday February 16, 2015 @02:58AM (#9055813)
boot2docker is a commandline interface to docker that works on Windows, Mac and Linux. (Maybe *BSDs too.)

On non Linux systems, it downoads a prebuilt VM, and runs it with Virtualbox.

This is how Docker currently works on other OSes.