How-to install this cluster configuration ?

You need at least of two Debian Jessie servers with clean install.

1 - Xen Installation

apt-get -y install xen-linux-system xen-tools
dpkg-divert --divert /etc/grub.d/08_linux_xen --rename /etc/grub.d/20_linux_xen
update-grub
sed -i '/TOOLSTACK/s/=.*/=xl/' /etc/default/xen
reboot

/etc/network/interfaces :

auto  eth0
iface eth0 inet manual

auto xenbr0
iface xenbr0 inet static
  address   <Ip> 
  broadcast <Broadcast>
  netmask   <NetMask>
  gateway   <GWAddr>
  bridge_ports eth0
  bridge_stp off       # disable Spanning Tree Protocol
  bridge_waitport 0    # no delay unless port available
  bridge_fd 0          # no forwarding delay

/etc/default/grub :

GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M dom0_max_vcpus=1 dom0_vcpus_pin"

/etc/default/xendomains :

XENDOMAINS_SAVE=

2 - Ganeti Installation

mkdir /root/.ssh/
apt-get install ganeti2 ganeti-instance-debootstrap
cd /boot
ln -s vmlinuz-3.16* vmlinuz-3-xenU
ln -s initrd.img-3.16* initrd-3-xenU

/var/lib/ganeti/config.data :

"xen_cmd":"xl"},
"link":"xenbr0",
"initrd_path":"/boot/initrd-3-xenU",
"kernel_args":"ro",
"kernel_path":"/boot/vmlinuz-3-xenU",
"min disk-size":"150",
"master_netdev":"xenbr0",
"link":"xenbr0",
"volume_group_name":"vgganeti",
"metavg":"vgganeti",

DRBD :

apt-get install drbd8-utils
echo "options drbd minor_count=128 usermode_helper=/bin/true" \
   > /etc/modprobe.d/drbd.conf
echo "drbd" >> /etc/modules
depmod -a
modprobe drbd
service ganeti restart

/etc/hosts :

127.0.0.1   localhost
192.168.1.10 server.domain.you  server
192.168.1.11 cluster.domain.you cluster

3 - Ganeti Cluster Init

gnt-cluster init --vg-name=vgganeti --master-netdev=xenbr0 cluster.domain.you

4 - Adding Ganeti Nodes

gnt-node add mynewnode.node
gnt-node list

Don't forget to deploy your configuration (or clone this repo) on all your nodes !

5 - Deploy configuration using Saltstack

For deploy the Ganeti configuration with saltstack, you need clone my Ganeti repo in salt directory :

cd /srv/salt/
git clone https://github.com/valentin2105/Ganeti.git 

After, you need to edit your top.sls file for match your Ganeti's nodes, for example :

base:
  '(node*).domain.io':
    - match: pcre
    - ganeti

and let's apply this configuration :

salt 'node*' state.highstate