RHEL v7: How to reset the password

Reboot

-        Start system and at GRUB2 boot menu, press ‘e’ to edit default boot item.

-        Scroll down to locate ‘rhgb quiet’ and replace it with ‘rd.break enforcing=0’

-        Press Ctrl-x to start

-        Remount / File System with read and write option
# mount –o remount,rw /sysroot

-        To access system
# chroot /sysroot

-        Change root’s password
# passwd

-        SELinux relabeling
# touch /.autorelabel

-        Reboot System
# exit, exit (or Ctrl-b, Ctrl-b)