Linux: Grub recovery

How to recover when /boot/grub2/grub.cfg and or the grub directories are missing.

RHEL 7

1. Re-install grub2:

grub2-install /dev/<disk name>


2. Create grub.cfg file:

grub2-mkconfig -o /boot/grub2/grub.cfg

3. Create device.map file if missing:

vi /boot/grub2/device.map

(hd0)   /dev/<disk name>


4. Reboot