Currently docker can only mount folders from the host VM into your container. On OS X your host will most likely be VirtualBox. Thus you need to sync the folder

Currently docker can only mount folders from the host VM into your container. On OS X your host will most likely be VirtualBox. Thus you need to sync the folders from your mac into the VM, and from there into docker. The hack that docker-osx (https://github.com/noplay/docker-osx https://github.com/noplay/docker-osx) uses has been very effective for me. Basically it mounts your user directory into the vagrant VM at the same path. From there, you can bind-mount any folder in your home directory easily via something like "docker run -i -t --rm -v $(pwd):/srv ubuntu /bin/bash".