Turn on SELinux in Redhat or CentOS Linux Over Remote SSH Session

To turn on SELinux on a Red Hat or CentOS Linux system over a remote SSH session, follow these steps:

1. Connect to the system via SSH as the root user.

2. Edit the /etc/selinux/config file by running the following command:

nano /etc/selinux/config

3. Find the following line in the file:

SELINUX=disabled

4. Change the line to the following:

SELINUX=enforcing

5. Save the file and exit the editor.

6. Run the following command to apply the changes:

setenforce enforcing

7. Reboot the system for the changes to take effect:

reboot

SELinux will now be enabled on the system.

Note: If you want to set SELinux to permissive mode instead of enforcing mode, change the SELINUX line to SELINUX=permissive and run the setenforce permissive command. In permissive mode, SELinux will log actions that would be denied in enforcing mode, but it will not actually enforce the rules.