dotcloud/docker — pull request #2394 by gurjeet (2013-10-25 18:23:00+00:00)
Title: Add ability to specify custom filename to be used as Dockerfile.

Now one can perform the following commands in the same directory:

docker built -t db_container -f db.dockerfile .
docker built -t web_container -f web.dockerfile .
docker built -t client_container -f client.dockerfile .
docker built -t client_container .

The last one will use the default Dockerfile file.