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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 DEBIAN
grub-install
GRUB-INSTALL(8) FSF GRUB-INSTALL(8) NAME
grub-install - install GRUB on your drive SYNOPSIS
grub-install [OPTION] install_device DESCRIPTION
Install GRUB on your drive. -h, --help print this message and exit -v, --version print the version information and exit --root-directory=DIR install GRUB images under the directory DIR instead of the root directory --grub-shell=FILE use FILE as the grub shell --no-floppy do not probe any floppy drive --force-lba force GRUB to use LBA mode even for a buggy BIOS --recheck probe a device map even if it already exists INSTALL_DEVICE can be a GRUB device name or a system device filename. grub-install copies GRUB images into the DIR/boot directory specfied by --root-directory, and uses the grub shell to install grub into the boot sector. REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
grub(8), update-grub(8). The full documentation for grub-install is maintained as a Texinfo manual in the grub-legacy-doc package. If the info and grub-install programs are properly installed at your site, the command info grub-install should give you access to the complete manual. grub-install (GNU GRUB 0.97) January 2013 GRUB-INSTALL(8)