CentOS: Resetting a forgotten root Password…

Interrupt the boot at the GRUB stage and boot to runlevel 1, AKA single user mode. Interrupt GRUB by typing a character such as “space” then append to the kernel line by typing “a”, backspacing through “rhgb quiet” and appending ” 1<enter>”. This will give you a root shell and not a login prompt. From there you can use the “passwd” command to set a new root password.

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