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CentOS / RHEL v6.x: Install And Configure Serial Console

How do I configure serial console under CentOS Linux or Red Hat Enterprise Linux 6.x running on HP or Dell server?
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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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HowTo: Turn off SELinux

How do I turn off SELinux (Security-Enhanced Linux) under Linux operating systems?
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