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Custom Boot CD

Created by dave. Last edited by dave, 16 years and 292 days ago. Viewed 5,767 times. #2

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Here's how you create a custom boot CD for RedHat 7.3

In our case, we needed to do this because the boot media didn't understand the 10/100/1000 NIC which was onboard the MB for a new system.

mkdir /mnt/cdboot /mnt/initrd

find your cdboot.img file -- this location is valid for 7.3

cp /mnt/cdrom/dosimages/autoboot/cdboot.img /tmp/cdboot.img

mount it, extract the initrd, and mount that

mount -o loop /tmp/cdboot.img /mnt/cdboot
gzip -dc /mnt/cdboot/initrd.img > /tmp/initrd
mount -o loop /tmp/initrd /mnt/initrd

find and extract your modules

cd /tmp
gzip -dc /mnt/initrd/modules/modules.cgz | cpio -idv

make space if needed by deleting modules you don't need and then copy your module into place

find 2.4.18-3BOOT -print -depth | cpio -ov -H crc | gzip -c9 > modules.cgz
cp modules.cgz /mnt/initrd

Now you must update these files with info about your new module

vi /mnt/initrd/modules/pcitable
vi /mnt/initrd/modules/module-info

wrap it up

sync
umount /mnt/initrd
gzip -c9 /tmp/initrd > /mnt/cdboot/initrd.img
vi /etc/syslinux.cfg
umount /mnt/cdboot

now you have a 288Mb floppy image which can be used to boot a CD:

mkisofs -b /tmp/cdboot.img -l -J -R -r -T -V 'Custom RH Install' . > /tmp/cdboot.iso

Of course, what you need to remember is that even after doing all this your new, presumably critical, module is not going to be installed on the system after the kickstart -- because the installer assumes that anything included in the initrd is included in the kernel rpm. Which it isn't in this case.

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Custom Boot CD

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