How To Reset Root Password in CentOS 7

1. In the boot grub menu select option to edit.

Grub Menu select option to edit

2 — Select Option to edit (Press e for edit).

Change in line no 16(may vary system to system) replace ro

3 — Go to the line of Linux 16 and change ro with
rw init=/sysroot/bin/sh.
And more than one tty console available then remove extra tty console exept One.

4 — Now press Control+x to start on single user mode.

Go to Single user mode

5 — Now access the system with this command.

mount –o remount,rw /sysroot
chroot /sysroot

6 — Reset the password.

passwd root

7 – Update selinux information

touch /.autorelabel

8 — Exit chroot

exit

9 — Reboot your system

reboot

That’s it. Enjoy.