The preseed file it's "only" a text file with options that you can choose in installer predefined in a file. To install a system using it needs to "remaster" de CD with a little modification in
boot options and include the preseed file. It's no very complicated
A little/not exactly "quick guide" can be: (I'm not and expert, sorry if I'm wrong and for my english):
1) Copy all contents of the media (CD/DVD) into a local directory:
mkdir /tmp_dir
mount /dev/cdrom /media/cdrom
rsync -a /media/cdrom /tmp_dir
2) Modify a line in /tmp_dir/isolinux/txt.cfg file:
append vga=normal initrd=/install.386/initrd.gz -- quiet
to
append vga=normal initrd=/install.386/initrd.gz preseed/file=/cdrom/preseed.cfg -- quiet
3) Copy preseed file to root tmp_dir folder
cp some_location/preseed.cfg /tmp_dir/preseed.cfg
4) Rebuild the iso file with:
cd /tmp_dir
mkisofs -r -V "Custom Debian Install CD" -cache-inodes -J -l -b isolinux/isolinux.bin \
-c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table \
-o outputdir/modified_image.iso ./
(like the instruction /media/cdrom/.disk/mkisofs )
I recomend (I'm not an expert) to search too about "debconf-get-selections --installer", "DEBIAN_FRONTEND=text" and HOWTO remaster/rebuild a Debian image. :P
http://www.debian.org/releases/lenny/i386/apb.html.enhttp://www.debian.org/releases/lenny/example-preseed.txt
http://wiki.debian.org/DebianInstaller/Preseedetc...