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Repairing the GRUB bootloader

Guide to repair the GRUB bootloader on an instance

Last updated 23rd November 2020

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

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 Putting an instance in rescue mode).

Go further

Join our community of users on https://community.ovh.com/en/.


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