How to Reset CentOS Root Password: A Cyber Security Guide

Trying to recover a lost or forgotten CentOS root password can be a daunting task, but it is important to safeguard your system's security. Here are steps to reset your CentOS root password:

1. Boot into GRUB menu during system startup.
2. Choose the kernel you want to boot and edit the boot parameters by pressing 'e'.
3. Find the line starting with 'linux16' or 'linuxefi' and add 'rd.break' at the end of the line.
4. Press Ctrl + X to boot with the modified settings.
5. Remount the root partition in read/write mode by running 'mount -o remount,rw /sysroot'.
6. Change the root directory by running 'chroot /sysroot'.
7. Reset the root password with 'passwd' command.
8. Update SELinux context by running 'touch /.autorelabel'.
9. Exit the chroot environment with 'exit' command.
10. Reboot your system and login with the new root password.

It is crucial to secure your system by regularly updating passwords and following best cyber security practices to prevent unauthorized access.