Repairing the GRUB bootloader

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

• A Public Cloud instance in your OVHcloud account

OVHcloud Control Panel Access

• Direct link: Public Cloud Projects
• Navigation path: Public Cloud > Select your project

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 How to activate rescue mode on a Public Cloud instance).

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