How do I prevent a non-root user from shutting down, rebooting, or halting the system?

Solution Unverified - Updated -

Issue

The steps to follow to prevent non-root users to shutdown/reboot/halt the server are:

  1. In the file /etc/X11/gdm/gdm.conf, change the line that reads:

    
    SystemMenu=true
 to
    SystemMenu=false

  2. In the file /etc/inittab, change the line that reads:

    
    ca::ctrlaltdel:/sbin/shutdown -t3 -r now
 to
    ca::ctrlaltdel:echo <A message indicating rebooting is not possible>

  3. In the directory /etc/security/console.apps/, remove the files: reboot, poweroff, and halt. To remove files, use the rm command. Example: rm /etc/security/console.apps/poweroff.

  4. Remove the file /usr/bin/poweroff

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