Resetting a Forgotten Root Password

If you have forgotten the root password it is possible to set a new one as follows:

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.

Other user passwords can be reset, and other administrative tasks can be performed as well. Exiting the single user root shell will boot to the multi-user mode defined in /etc/inittab.

If SELinux is enforcing then do not forget to relabel your filesystem afterwards or you will not be able to login until you reboot and repeat the instructions and include the autorelabel

TipsAndTricks/ResetRootPassword (last edited 2014-09-03 14:41:28 by TimothyLee)