$ vmtree -h | head -1
Utility to display cloud images and servers' inheritance tree.
The nova client program (and the web UI) is a source of comprehensive information on an OpenStack deployment. This information, however, is presented in a strictly typed manner: you get information either on servers, or images, or networks, or whatever entity, but on one of these at a time.
Some information is though inherently heterogenous. One such is the inheritance tree, involving images and servers. Images beget servers by instantiation, and servers beget images by snapshotting. It might be convenient to get an overview of these begetting relations. vmtree is an utility to display the tree that they consitute.