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discretionary access control

What Is SELinux?

What is SELinux? Why should I use SELInux on my CentOS or Red Hat Enterprise Linux server running on IBM hardware?
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CentOS / Redhat: Turn On SELinux Protection

SELinux enforces the idea that programs should be limited in what files they can access and what actions they can take. However, by default it is turned off under RHEL / CentOS 5.x server? How do I turn it on? How can I enable SELinux on CentOS / RHEL 6 IBM server?
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