How To Reset Lost root Password in CentOS 8 / RHEL 8
Administrators sometimes end up with a requirement to reset the root password due to a lost root password. It’s quite often happening because administrators have to remember lots of passwords or frequent change of root password to adhere to organizations password policies.
Boot the system into the single-user mode using the below link.
Reset lost root password
chroot your system if you haven’t done already.
Reset the root password.
Update SELinux information.
Reboot your system.
Please wait for SELinux relabeling to complete. This relabeling would take some time depending on file system size.
You can now login to your system with the new password.