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Copyright © Acronis, Inc., 2000-2010
6.3.11.1
How to reactivate GRUB and change its configuration
Generally, you should refer to the boot loader manual pages for the appropriate procedure. There is
also the corresponding Knowledge Base article on the Acronis Web site.
The following is an example of how to reactivate GRUB in case the system disk (volume) is recovered
to identical hardware.
1.
Start Linux or boot from the bootable media, and then press CTRL+ALT+F2.
2.
Mount the system you are recovering:
mkdir /mnt/system/
mount -t ext3 /dev/sda2 /mnt/system/ # root partition
mount -t ext3 /dev/sda1 /mnt/system/boot/ # boot partition
3.
Mount the
proc
and
dev
file systems to the system you are recovering:
mount -t proc none /mnt/system/proc/
mount -o bind /dev/ /mnt/system/dev/
4.
Save a copy of the GRUB menu file, by running one of the following commands:
cp /mnt/system/boot/grub/menu.lst /mnt/system/boot/grub/menu.lst.backup
or
cp /mnt/system/boot/grub/grub.conf /mnt/system/boot/grub/grub.conf.backup
5.
Edit the
/mnt/system/boot/grub/menu.lst
file (for Debian, Ubuntu, and SUSE Linux
distributions) or the
/mnt/system/boot/grub/grub.conf
file (for Fedora and Red Hat Enterprise
Linux distributions)—for example, as follows:
vi /mnt/system/boot/grub/menu.lst
6.
In the
menu.lst
file (respectively
grub.conf
), find the menu item that corresponds to the system
you are recovering. This menu items have the following form:
title Red Hat Enterprise Linux Server (2.6.24.4)
root (hd0,0)
kernel /vmlinuz-2.6.24.4 ro root=/dev/sda2 rhgb quiet
initrd /initrd-2.6.24.4.img
The lines starting with
title
,
root
,
kernel
, and
initrd
respectively determine:
The title of the menu item.
The device on which the Linux kernel is located—typically, this is the boot partition or the
root partition, such as
root (hd0,0)
in this example.
The path to the kernel on that device and the root partition—in this example, the path is
/vmlinuz-2.6.24.4
and the root partition is
/dev/sda2
. You can specify the root partition by
label (such as
root=LABEL=/
), identifier (in the form
root=UUID=
some_uuid
), or device name
(such as
root=/dev/sda2
).
The path to the
initrd
service on that device.
7.
Edit the file
/mnt/system/etc/fstab
to correct the names of any devices that have changed as a
result of the recovery.
8.
Start the GRUB shell by running one of the following commands:
chroot /mnt/system/ /sbin/grub
or
chroot /mnt/system/ /usr/sbin/grub
9.
Specify the disk on which GRUB is located—typically, the boot or root partition:
root (hd0,0)
