To disable SElinux temporaly:

setenforce 0

To disable SELinux Permanetly, edit file /etc/sysconfig/selinux:

# 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. Only selected processes are protected.
#     mls - Multi Level Security protection.

Change SELINUX=enforcing to SELINUX=disabled

Check the status of SELinux using sestatus command