# 20M de secteurs de 512 bytes = 10GB (ici img extensible)
dd if=/dev/zero of=node4.img bs=512 count=0 seek=20M

# Récupération taille en bytes
ls -l node4.img 
-rw-r--r-- 1 root root 10737418240 2010-01-28 10:16 node4.img

# Calcul du nombre de cylindres (C=1305)
bc
10737418240 / (255*63*512)
1305

# Partionnement fdisk (n p 1 \n 1240 n p 2 \n \n t 2 82 a 1 w)
fdisk -C1305 -H255 -S63 node4.img
Disk node4.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xcce5bc97
    Device Boot      Start         End      Blocks   Id  System
node4.img1   *           1        1240     9960268+  83  Linux
node4.img2            1241        1305      522112+  82  Linux swap / Solaris

# Création des loops pour l'img et ses parts
losetup /dev/loop0 node4.img
kpartx -a /dev/loop0

# Formatage ext3 (fsck tous les 50mt, label /) + de la swap
mkfs.ext3 -F /dev/mapper/loop0p1
tune2fs -c 50 /dev/mapper/loop0p1
e2label /dev/mapper/loop0p1 /
mkswap /dev/mapper/loop0p2


mkdir n4dir
mount /dev/mapper/loop0p1 n4dir

# Install d'une racine GNU/Linux (ici un debootstrap lenny)
tar -zxvf lenny.tgz -C n4dir/

# Config basique + install pkg kernel & grub + serial port (via un chroot)
mount --bind /dev n4dir/dev
chroot n4dir env -i TERM=xterm-color HOME=/root PATH=$PATH LANG=C bash
mount -t proc none
mount -t sysfs none /sys /proc
printf "127.0.0.1 localhost\n127.0.1.1 debian" > /etc/hosts
echo "debian" > /etc/hostname
printf "/dev/hda1 / ext3 defaults 0 1\n/dev/hda2 none swap\n" > /etc/fstab
echo "nameserver 4.2.2.2" > /etc/resolv.conf
echo "deb http://ftp.debian.org/debian lenny main contrib" > /etc/apt/sources.list
sed -i 's/^exit 0/rmmod pcspkr 2\>\/dev\/null\nloadkeys fr\nexit 0/' /etc/rc.local
apt-get update && apt-get upgrade
apt-get install linux-image-amd64 grub console-data locales less htop ftp file vim-nox
apt-get clean
sed -i 's/^#T0:/T0:/' /etc/inittab
cp -rf /usr/lib/grub/x86_64-pc /boot/grub
cat << EOF > /boot/grub/menu.lst
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal serial
title Debian
root (hd0,0)
kernel /vmlinuz root=/dev/hda1 ro console=ttyS0,9600n8
initrd /initrd.img
EOF
umount /proc
umount /sys
exit
umount n4dir/dev

# Install du grub dans le MBR de l'img
grub --device-map=/dev/null
device (hd0) node4.img
find /boot/grub/stage1
root (hd0,0)
setup (hd0)
quit

# Infos sur l'img créée
file node4.img
node4.img: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, stage2 address 0x2000, stage2 segment 0x200; partition 1: ID=0x83, active, starthead 1, startsector 63, 19920537 sectors; partition 2: ID=0x83, starthead 254, startsector 19920600, 1044225 sectors, code offset 0x48

# Lancer avec KVM...
kvm -smp 2 -m 512M -hda node4.img -nographic -usb -soundhw ac97

# ...ou préparer un disque physique (SATA, USB...)
cat node4.img > /dev/sdb