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
- The instance must be in rescue mode (see Putting an instance in rescue mode).
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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