This Ubuntu image uses a new "lean process manager" that simplifies management multi-process containers. It is just going into Beta.
This is a simplified image with a minimal install, and a quick placeholder application that runs upon startup.
If you want to see a typical use-case, the 'chaperone-lamp' image is based upon this one and provides a easy-to-use fully customizable LAMP stack. See the "Try It" section on github, here: https://github.com/garywiz/chaperone-docker
Chaperone documentation is here: http://garywiz.github.io/chaperone/