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UNIX for Advanced & Expert Users
Grub - how to boot a copy of Linux (full system backup)
Post 302765975 by coolatt on Monday 4th of February 2013 02:55:05 AM
02-04-2013
Quote:
Its easy, a two step process.
You only need to edit grub.conf to add another boot option only for the vmlinux image you get into SystemBackup02/boot directory. Run 'install-grub /dev/<device holding SystemBackup02>'.
Hope both primary and backup machines have same architecture & device configurations!!!
A word of caution: It's a bit risky with little scope for mistakes; however don't assume that you are doomed on your mistake (until you delete your own data), if the backup system doesn't boot. You'll need to re-boot them again with a backup CD images and mount the drives temporarily and re-do the process correctly, BUT this time differently (mind that mounting may change paths). I've landed into mess and bounced back too but tensions run always high.
You only need to edit grub.conf to add another boot option only for the vmlinux image you get into SystemBackup02/boot directory. Run 'install-grub /dev/<device holding SystemBackup02>'.
Hope both primary and backup machines have same architecture & device configurations!!!
A word of caution: It's a bit risky with little scope for mistakes; however don't assume that you are doomed on your mistake (until you delete your own data), if the backup system doesn't boot. You'll need to re-boot them again with a backup CD images and mount the drives temporarily and re-do the process correctly, BUT this time differently (mind that mounting may change paths). I've landed into mess and bounced back too but tensions run always high.
)Also note that the "SystemBackup02" is just another directory on the same disk /dev/sda.
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LEARN ABOUT CENTOS
grub2-bios-setup
GRUB-BIOS-SETUP(3) Library Functions Manual GRUB-BIOS-SETUP(3) NAME
grub-bios-setup -- Set up images to boot from a device. SYNOPSIS
grub-bios-setup [-a | --allow-floppy] [-b | --boot-image=FILE] [-c | --core-image=FILE] [-d | --directory=DIR] [-f | --force] [-m | --device-map=FILE] [-s | --skip-fs-probe] [-v | --verbose] DEVICE DESCRIPTION
You should not normally run this program directly. Use grub-install instead. OPTIONS
--allow-floppy Make the device also bootable as a floppy. This option is the default for /dev/fdX devices. Some BIOSes will not boot images cre- ated with this option. --boot-image=FILE Use FILE as the boot image. The default value is boot.img. --core-image=FILE Use FILE as ther core image. The default value is core.img. --directory=DIR Use GRUB files in the directory DIR. The default value is /boot/grub. --force Install even if problems are detected. --device-map=FILE Use FILE as the device map. The default value is /boot/grub/device.map . --skip-fs-probe Do not probe DEVICE for filesystems. --verbose Print verbose messages. SEE ALSO
info grub Wed Feb 26 2014 GRUB-BIOS-SETUP(3)