Tuesday, 12 April 2016

How to Disable SELinux on CentOS 7



SELinux, or Security-Enhanced Linux, is a set of security modules which are loaded in to kernel to improve security on accessing services/files which improve security. SELinux was initially released as a collaborative between Red Hat and the National Security Agency. The SELinux kernel separates policy and decisions inside the kernel to distribute levels of protection and prevent a total security breach.

Step 1: Check SELinux current status, issue the sestatus command.

[root@linuxcnf ~]# sestatus
SELinux status:                              enabled
SELinuxfs mount:                         /sys/fs/selinux
SELinux root directory:                /etc/selinux
Loaded policy name:                     targeted
Current mode:                                enforcing
Mode from config file:                  enforcing
Policy MLS status:                         enabled
Policy deny_unknown status:     allowed
Max kernel policy version:          28
[root@linuxcnf ~]#

Step 2: Modify the SELinux configuration file and Change ‘SELINUX=enforcing’ to ‘SELINUX=permissive’ or ‘SELINUX=disabled’ and save the configuration file:

[root@linuxcnf ~]# vi /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.
SELINUX=disabled
# 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.
SELINUXTYPE=targeted
[root@linuxcnf ~]#

Step 3: Reboot the system to reflect the changes.

 [root@linuxcnf ~]# reboot

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