SELinux is a recently added security system that’s installed by default with CentOS 5.1 (and Red Hat Enterprise Linux 5, and others). Since it’s newer than the classic “Discretionary Access Control” Unix security model, it’s not nearly as well documented, and unfamiliar to many. I had never even heard of it until this week.
After a lot of reading about it, and debating disabling it entirely, I figured out how to do some minor SELinux customization to fit my needs for a MySQL database server. Hopefully this will help folks who are in a similar situation.