(R)?ex is a server orchestration and configuration management tool. With (R)?ex you can manage all your boxes from a central point through the complete process of configuration management and software deployment.
In short words, Rex is like Make. There is a central Rexfile where you can define tasks. These tasks gets executed on remote machines over ssh. The tasks are written in plain perl.
In this guide I will use Subversion to manage all the Tasks. You can use any other SCM system as well, as long it supports something similar to Subversion’s external directive. I’m using Ubuntu 12.04 but you can use other distributions as well.