Wednesday, August 18, 2010

Boot System Rescue CD from ISO image on the disk with Grub2

"SystemRescueCd is a (Gentoo) Linux system rescue disk available as a bootable CD-ROM or USB stick for administrating or repairing your system and data after a crash." The latest version include many administration tool of both CLI and GUI. If you frequently use SystemRescueCd, you may want to boot it directly from Grub2.
From version 2 GRUB can provide the GREAT loopback option, in co-junction with whom some Linux Live CD distributions (grml, SystemRescueCd, etc) provide direct boot (iso9660) ISO via their options — isofrom, findiso, isoloop and some others. Option isoloop is only supported in SystemRescueCd from version 1.4.0.
The ISO is in (hd0,3)/ISOs/. grub.cfg has the following entry:

# Boot system rescue CD from ISO
menuentry "System Rescue CD from ISO" {
loopback loop (hd0,3)/ISOs/res-1.5.8.iso
linux (loop)/isolinux/rescuecd isoloop=/ISOs/res-1.5.8.iso setkmap=us
initrd (loop)/isolinux/initram.igz

grub.cfg contains the global option set root='(hd0,3)', so boot script will search the ISO image in /dev/sda3 partition in the path specified after isoloop option.

Read more:
1. Boot the SystemRescueCD ISO image from the disk using Grub2
2. Boot an ISO via Grub2
3. MultiBoot USB with Grub2 (boot directly from iso files)

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