reboot the server
at grub menu, press up/down to pause auto booting
select top menu item, press e (to edit)
in editing menu, go to end of line starting with “linux” and add “rd.break”
press control-x to boot using this edited grub command line
when the server starts you should not have to login
at the prompt, type :
mount -o remount,rw /sysroot/ chroot /sysroot passwd root shutdown -r now