If you hadn't heard, the new release of docker no longer uses "color_animal" but "mood_inventor"... "the most important new feature of docker 0.7" https://gith

If you hadn't heard, the new release of docker no longer uses "color_animal" but "mood_inventor"... "the most important new feature of docker 0.7" https://github.com/dotcloud/docker/pull/2837 https://github.com/dotcloud/docker/pull/2837 tl;dr They are going to pick a new pair of things for every major release of Docker. This is meant to let you keep track of more containers over a long time. Apparently you are in fact meant to keep them around if they're still in working order, and remember them "by ID" or by name.