Monday, March 1, 2010

Forgotten root Password

Help! I forgot my root password. How do I log in now?

You can log in using single-user mode and create a new root password.

To enter single-user mode, reboot your computer. If you use the default boot loader, GRUB, you can enter single user mode by performing the following:

1.

At the boot loader menu, use the arrow keys to highlight the installation you want to edit and type [A] to enter into append mode.
2.

You are presented with a prompt that looks similar to the following:

grub append> ro root=LABEL=/

3.

Press the Spacebar once to add a blank space, then add the word single to tell GRUB to boot into single-user Linux mode. The result should look like the following:

ro root=LABEL=/ single

4.

Press [Enter] and GRUB will boot single-user Linux mode. After it finishes loading, you will be presented with a shell prompt similar to the following:

sh-2.05b#

5.

You can now change the root password by typing

passwd root

You will be asked to re-type the password for verification. Once you are finished, the password will be changed. You can then reboot by typing reboot at the prompt; then you can log in to root as you normally would.




for link: http://www.linuxtopia.org/online_books/centos_linux_guides/centos_linux_step_by_step_guide/s1-q-and-a-root-passwd.html

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