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E.3. 安装 GRUB

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:
# grub-install disk
使用系统 boot 驱动器的设备名称(比如 /dev/sda)替换 disk
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).
有关安装 GRUB 的附加信息请查看 《GNU GRUB 手册》grub-install(8) man page。有关 EFI 系统分区的详情请查看 第 9.18.1 节 “高级引导装载程序配置”。有关 efibootmgr 工具的详情请查看 efibootmgr(8) man page。