How2CentOS shows you how to disable SELinux in CentOS

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(R), Role Based Access Control, and Multi-Level Security.

  CentOS: Disable SELinux