Installing and upgrading help

Check the documentation. Unfortunately you didn't mention the Moodle version.

Relevant:
- http://docs.moodle.org/19/en/Category:Installation
- http://docs.moodle.org/23/en/Category:Installation
- http://docs.moodle.org/24/en/Category:Installation

There is a page for SLES:
- http://docs.moodle.org/19/en/SUSE_Linux_Server_10
- http://docs.moodle.org/23/en/SUSE_Linux_Server_10
- http://docs.moodle.org/24/en/SUSE_Linux_Server_10
looks a bit dusty though.

You might want to go through the generic installation notes instead:
- http://docs.moodle.org/19/en/Installing_Moodle
- http://docs.moodle.org/23/en/Installing_Moodle
- http://docs.moodle.org/24/en/Installing_Moodle