What is SELINUX?
Wiki says:
Security-Enhanced Linux (SELinux) is a Linux feature that provides a mechanism for supporting access control security policies, including U.S. Department of Defense style mandatory access controls, through the use of Linux Security Modules (LSM) in the Linux kernel. It is not a Linux distribution, but rather a set of modifications that can be applied to Unix-like operating system kernels, such as Linux and that of BSD. …. more you can visit at http://en.wikipedia.org/wiki/Selinux
Is SELINUX need to be disabled?
In normal use, you do not need to disable SELINUX since it securing system for you.
But sometime SELINUX can break some software when it active, so for this condition you have to disable it.
How to disable SELINUX?
It easy 