On OSX I followed the installation instructions of boot2docker and am able to build and run Debian containers. However, the documentation states that the host (osx) should have a docker0 interface, binding the container with the host.
However:
$ ifconfig docker0
ifconfig: interface docker0 does not exist
How do I create the docker0 interface on osx?
My goal is to communicate with an open db port on the host machine.
You should use boot2docker ssh to login your virtual machine first.
Boot2docker install virtualbox in your osx and boot a debian distribution on it. And your docker is installed in your virtual machine.