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Repairing the GRUB bootloader
Guide to repair the GRUB bootloader on an instance
2020-11-23

Objective

In some cases you might need to repair the GRUB bootloader. This guide will show you how to easily repair the bootloader and successfully reboot your instance.

Requirements

Instructions

Warning

The instance must be in rescue mode (see How to activate rescue mode on a Public Cloud instance).

Connect to the instance, either via VNC in the OVHcloud Control Panel or via SSH.

Type the following commands to mount the remote file system and start GRUB repairs:

mount /dev/sdb1 /mnt
mount -o bind /proc /mnt/proc
mount -o bind /sys /mnt/sys
mount -o bind /dev /mnt/dev
chroot /mnt /bin/bash

Update GRUB (or GRUB2)

For GRUB installs:

grub-install /dev/sdb
update-grub

For GRUB2 installs:

grub2-install /dev/sdb
grub2-mkconfig -o /boot/grub2/grub.cfg

You can now leave the rescue mode and boot normally (see How to activate rescue mode on a Public Cloud instance).

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