In a vast majority of cases, GRUB is installed and configured by default during the installation of Red Hat Enterprise Linux. However, if for some reason GRUB is not installed, or if you need to install it again, it is possible to install grub manually.
On systems without UEFI firmware, a valid GRUB configuration file must be present at
/boot/grub/grub.conf. You can use the
grub-install script (part of the grub package) to install GRUB. For example:
Replace disk with the device name of your system's boot drive such as
On systems with UEFI firmware, a valid GRUB configuration file must be present at
/boot/efi/EFI/redhat/grub.conf. An image of GRUB's first-stage boot loader is available on the EFI System Partitition in the directory
EFI/redhat/ with the filename
grubx64.efi, and you can use the
efibootmgr command to install this image into your system's EFI System Partition. For example:
efibootmgr -c -d disk -p partition_number -l /EFI/redhat/grubx64.efi -L "grub_uefi"
Replace disk with the name of the device containing the EFI System Partition (such as
/dev/sda) and partition_number with the partition number of your EFI System Partition (the default value is 1, meaning the first partition on the disk).