Change Linux Root Password Using GRUB Mode

Follow these steps to reset the root password on a Linux system using GRUB mode:

Step-by-Step Process

1. Restart your Linux system.
2. When the GRUB menu appears, select the boot entry you want to modify and press e to edit.
3. Find the line that starts with linux or linux16.
4. At the end of this line, add rd.break.
5. Press Ctrl + X or F10 to boot with the modified entry.
6. Once the system boots into a shell, remount the root filesystem in read-write mode by running:

   mount -o remount rw /sysroot 

7. Change the root directory to the sysroot:

   chroot /sysroot

8. Change the root password using the passwd command:

   passwd

9. Enter the new password and confirm it.
10. If SElinux is enabled, you may need to relabel the filesystem. Create an empty file to trigger the relabeling:

    touch /.autorelabel

11. Exit the chroot environment:

    exit

12. Exit the shell environment:

    exit

13. After Machine Reboot the system will relabel the filesystem and you will be able to login with the new root password.

Important Notes

• Ensure you have physical access to the machine to perform these steps.
• Changing the root password without authorization may violate security policies.