NSA Security-Enhanced Linux (SELinux) is an implementation of a flexible mandatory access control architecture in the Linux operating system. The SELinux architecture provides general support for the enforcement of many kinds of mandatory access control policies, including those based on the concepts of Type Enforcement, Role-Based Access Control, and Multi-Level Security. Background information and technical documentation about SELinux can be found at

To disable SELinux:
Edit /etc/selinux/config
and change SELINUX from enforcing to disabled

[root@ConfigNotes ferdy]# vi /etc/selinux/config 
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy, selected processes. 
#     mls - Multi Level Security protection.