For those who are forgot their CentOS root password, please do not panic. There was the easy way to reset the root password for CentOS. Please follow this steps and you will be able to access your CentOS.

1. Reboot the CentOS machine
2. When booting up, press any key to go into the select menu.
3. The press ‘e’ to navigate to second grub.conf line (kernel)
4. Once again press ‘e’ to edit the line and you can select one step from these option :

• option 1 : 1 (’1′) at the end of the line. OR
• option 2: S (‘S’) a the end of the line OR
• option 3: add ‘single’ to “ro root=LABEL=/ single”

5. After edit, hit “ENTER”
6. Press ‘b’ to reboot
7. After reboot it will stop at ‘#’ command line.
8. At ‘#’ command line, type ‘passwd’ to create new password.
9. Reboot machine as usual
10 Finish