Installing spacewalk is really easy task. It is well documented on this link but as I like to have all on one place I will do it also here. First of all we need to install all needed repositories, so here is a list of to do tasks.
Install spacewalk repository. Currently available version is 2.4 for you this will probably be something another.
Add jpackage repository
Add EPEL repository
For place to store data we will need database. My choice is PostgreSQL.
Finally install spacewalk.