How to reset root password in CentOS 7

Resetting admin password in CentOS 7 is different than of CentOS 6, as CentOS 7 utilized Grub 2 and has a different procedure to access Single User Mode. First, boot your system in Single User Mode to reset the root password by following the below tutorial:

How to boot CentOS 7 in Single User Mode

Once done, now, you may first chroot the system:

chroot /sysroot

Now, you may reset the password using the following:

passwd root

You should be done. If you are using SELinux, then you need to relabel accordingly:

touch /.autorelabel

Then, exit chroot and reboot the system:

exit && reboot

You should be done now.