1. During the boot process, press the E key at the Grub2 menu.
4. Add the following to the end of the line.
6. Once the system is booted, you will be at the root user in single user mode. But this is a read only file system. Validate this by using the following command. This should fail. # touch /tmp/test
7. You need to mount the / filesystem. Use the command as follows.
# mount -o remount, rw /
# touch /tmp/test
9. Change the password for root.
10. Touch the following file as a fix file process. This is for SELinux.
# touch /.autorelabel
11. Finally start the normal boot process. In some references you can use the reboot command but in my testing, it was not as stable.
# exec /sbin/init
12. Now login with the new password!