The SELinux stands for Security-Enhanced Linux where it is a linux kernel security module. It is enabled by default on most of the linux distribution that we use for servers like centOS. It provides enhanced security measurements. It gives you fine control over all programs and daemons on their activities like communicating with out side programs or controlling whether to establish a outside connections for a particular program.
It is always recommended to have SELinux enabled on a server to avoid common security glitches.
To query the current status of SELinux use the following commands
The above command will report the current status of SELinux. Whether SELinux is enforcing, permissive, or disabled. If it is already disabled.
Disabling SELinux
Open the file /etc/selinux/config and change the option SELINUX to disabled
if you open file you would see something like
If SELinux is enabled you would see enforcing replace it with disabled.
You should restart the machine to take effect If you change SELINUX status from Enabled to Disabled or vice versa.
Enabling SELInux
To enable SELinux follow the below instructions,
- Open the file /etc/selinux/config
- Change option SELINUX from disabled to enforcing
- Restart the machine
Change mode
To change the mode of SELinux which is running
Check Status
SELinux is the linux kernel module for enhanced security. SELinux stands for Security-Enhanced Linux. If SELinux is installed on your machine or server you can check the current status by using following commands
The above command will give you one of the following as an output
