9.5. Creating Boot CDs

If problems occur booting your system using a boot manager or if the boot manager cannot be installed on the MBR of your hard disk or a floppy disk, it is also possible to create a bootable CD with all the necessary start-up files for Linux. This requires a CD writer installed in your system.

Creating a bootable CD-ROM with GRUB merely requires a special form of stage2 called stage2_eltorito and, optionally, a customized menu.lst. The classic files stage1 and stage2 are not required.

Procedure 9.7. Creating Boot CDs

  1. Create a directory in which to create the ISO image, for example:

    cd /tmp
    mkdir iso
  2. Create a subdirectory for GRUB:

    mkdir -p iso/boot/grub
  3. Copy the kernel, the files stage2_eltorito, initrd, menu.lst, and /boot/message to iso/boot/:

    cp /boot/vmlinuz iso/boot/
    cp /boot/initrd iso/boot/
    cp /boot/message iso/boot/
    cp /boot/grub/menu.lst iso/boot/grub
  4. Adjust the path entries in iso/boot/menu.lst to make them point to a CD-ROM device. Do this by replacing the device name of the hard disks, listed in the format (hd*), in the pathnames with the device name of the CD-ROM drive, which is (cd):

    gfxmenu (cd)/boot/message
    timeout 8
    default 0
    title Linux
       kernel (cd)/boot/vmlinuz root=/dev/hda5 vga=794 resume=/dev/hda1 \
       splash=verbose showopts
       initrd (cd)/boot/initrd
  5. Create the ISO image with the following command:

    mkisofs -R -b boot/grub/stage2_eltorito -no-emul-boot \
    -boot-load-size 4 -boot-info-table -o grub.iso iso
  6. Write the resulting file grub.iso to a CD using your preferred utility.