diff --git a/preseed/README.md b/preseed/README.md
index 183fb7d..07c327c 100644
--- a/preseed/README.md
+++ b/preseed/README.md
@@ -1,15 +1,82 @@
 SWH internal infrastructure preseeding configuration
 ---------------------------------------------------------
 
+# Preseed
+
+Technology used to automate the debian installation per vm creation.
+
+# Generate preseed from template
+
+## Sample 1
+
+Generate a preseed for a vm for public facing interface (e.g front server):
+
 ``` shell
 ./generate_preseed.py \
-    -n worker03 \
+    --hostname worker03 \
     --private-mac 52:54:00:1a:85:9e \
-    --finish-url http://perso.ensta-paristech.fr/~dandrimont/finish.sh \
-    --preseed-template preseed.cfg.tpl \
     --public-mac 52:54:00:be:26:34 \
     --public-ip 128.93.193.23 \
     --public-netmask 255.255.255.0 \
     --public-gateway 128.93.193.254 \
     --public-dns 193.51.196.130
 ```
+
+## Sample 2
+
+Generate a preseed for a vm for internal use (e.g workers):
+
+``` shell
+./generate_preseed.py \
+    --hostname icinga0 \
+    --vmid 112 \
+    --private-mac 8E:7D:DA:B5:42:83 \
+    --ram 4096 \
+    --private-ip 192.168.100.21 \
+    --disk-specs proxmox-rbd:40G
+```
+
+Note:
+- You must be consistent with whatever you used on the proxmox ui [1]
+- The following information are provided in the proxmox ui after vm creation:
+  - vmid
+  - private-mac
+
+[1] https://louvre.internal.softwareheritage.org:8006
+
+# Run
+
+Pre-requisite, on the hypervisor:
+
+``` shell
+$ 7z x -o/tmp/debian-netinstall/ /var/lib/vz/template/iso/debian-$version-netinstall.iso
+$ cp -v /tmp/debian-install.amd/initrd.gz /tmp/initrd.gz
+$ cp -v /tmp/debian-install.amd/vmlinuz /tmp/linux
+```
+
+Generate the preseed, the output of the generation will explain what to do:
+
+``` shell
+$ ./generate_preseed.py -n icinga0 --private-ip 192.168.100.21 --vmid 112 --private-mac 8E:7D:DA:B5:42:83 --ram 4096 --disk-specs beaubourg-local:40G
+
+# >>>>> Local
+scp preseed_icinga0.cfg louvre.internal.softwareheritage.org:/tmp
+scp preseed_icinga0.cfg beaubourg.internal.softwareheritage.org:/tmp
+
+# >>>>> Remote on hypervisor
+cd /tmp; cp preseed_icinga0.cfg preseed.cfg; (cat initrd.gz; echo preseed.cfg | cpio -Hnewc --quiet -o | gzip -c) > initrd_112.gz
+
+qm create 112 -bootdisk scsi0 -cores 1 -hotplug disk,network,usb,cpu -ide2 none,media=cdrom -memory 4096 -name icinga0 -net0 virtio=8E:7D:DA:B5:42:83,bridge=vmbr0 -numa 0 -ostype l26 -scsihw virtio-scsi-pci -sockets 1 -startup order=4 -scsi0 beaubourg-local:vm-112-disk-1,size=40G -args '-kernel /tmp/linux -initrd /tmp/initrd_112.gz'
+pvesm alloc beaubourg-local 112 vm-112-disk-1 40G --format raw
+qm start 112
+while qm status 112 | grep -q running; do sleep 10; done
+qm set 112 -delete args
+qm start 112
+
+```
+
+# Pre-requisite
+
+Install the `./preseed/finish.sh` script in the
+debian.internal.softwareheritage.org apache server:
+http://debian.internal.softwareheritage.org/installer/finish.sh