संजिव

Lesson 9.4: Set enforcing and permissive modes for SELinux

Modes of SELinux

Enforcing
Permissive
Disabled

Changing SELinux Modes at Boot Time

On boot, you can set several kernel parameters to change the way SELinux runs:

enforcing=1 : Setting this parameter causes the machine to boot in enforcing mode.
enforcing=0 : Setting this parameter causes the machine to boot in permissive mode, which is useful when troubleshooting issues.
selinux=0 : This parameter causes the kernel to not load any part of the SELinux infrastructure.

Viewing the current mode of SELinux

[root@server ~]# getenforce 
Enforcing

Disabling SELinux

# Temporary Disabling
[root@server ~]# setenforce 0
[root@server ~]# getenforce 
Permissive
 
# Permanent Disabling
[root@server ~]# vim /etc/sysconfig/selinux 
SELINUX=disabled    # Change to required
 
# Reboot the system to apply changes
[root@server ~]# reboot

Enabling SELinux

# When the SELinux is set to disabled
[root@server ~]# getenforce 
Disabled
 
# Modify the configuration file 
[root@server ~]# vim /etc/sysconfig/selinux 
SELINUX=enforcing       # Change to enforcing 
 
[root@server ~]# touch /.autorelabel
[root@server ~]# reboot