This is a Dockerfile for Plex Media Server based on ubuntu:trusty without additional frills, using the DEB package available on Plex Downloads section.
Latest version is: 0.9.12.3.1173-937aac3
Check for newer versions on https://plex.tv/downloads and if it isn't current, fork me or open an issue!
docker run -d -p 32400:32400 gionn/plex
and then browse http://localhost:32400.
A default volume is defined for holding library metadata at /var/lib/plexmediaserver.
To add your library, use -v /path/to/videos:/srv and then add /srv as library via Plex web interface.