You will be in the big trouble when dis-remember the root password. Only way to recover forgotten root password is to boot the server in single user mode to change the root password.
Here is practical way of doing it.
1. Reboot the server with following combination when the system asks for username & password in the console.
alt + ctrl + del
2. Then system get rebooted and comes at boot loader screen now press “space” bar.
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