Reset root password on rhel7

reboot to grub

during boot to grub2 ,press e to edit grub settings.

scroll down to linux16 line and add rd.break at the end of the line.

then tap ctrl+x to resume boot

reset password

switch_root:/# mount -o remount,rw /sysroot
chroot /sysroot
echo Password | passwd --stdin root
touch /.autorelabel
exit