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Here is how to disable SELinux on CentOS 7. That shall also work on the corresponding RedHat systems.

First of all check status of SELinux on your system:

~]$ sestatus

To make the SELinux permissive immediately:

~]$ sudo setenforce Permissive

To make SELinux permissive after reboot, edit /etc/sysconfig/selinux to get

SELINUX=permissive

To disable SELinux altogether, edit /etc/sysconfig/selinux to get

SELINUX=disabled

The changes in /etc/sysconfig/selinux will be in effect after

sudo reboot

Great SELinux HowTo from CentOS