xen_robin [Where there is a shell, there is a way]

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:!: Before installing the dedicated server, please follow this layout as we'll use the left free space for LVM (once the machine is installed) :

^ Mountpoint ^ Size ^ FS type ^ Partition type ^
| /boot | 256M | ext4 | Primary |
| / | 2048M | ext4 | Primary |
| swap | 1024 | swap | Primary |
| n/a | all free space | n/a | Extended |
| /usr| 4096| swap | Logical|
| /var | 4096| swap | Logical |

====== Xen install ======

  * Retrieve Xen version and install package

  apt-cache search xen-hypervisor
  apt-get install xen-hypervisor-4.x-amd64

  * Check if Xen has been integrated to grub

  grep Xen /boot/grub/grub.cfg

  * Specify dedicated CPUs and memory for dom0 in **/etc/default/grub** :

I prefer not to restrict memory for dom0, let's allocate only one CPU :

<code>
GRUB_CMDLINE_LINUX="apparmor=0"
GRUB_CMDLINE_XEN="dom0_max_vcpus=1 dom0_vcpus_pin"
</code>

  * Launch **update-grub**

  * Reboot

  * Check if Xen kernel has been loaded on boot

  xm list

====== Xen configuration ======

  * Comment and uncomment those lines in **/etc/xen/xend-config.sxp**

<code>
#(vif-script vif-bridge)
#(vif-script     vif-route)
(network-script network-nat)
(vif-script     vif-nat)
</code>

  * Launch **/etc/init.d/xen restart**

====== VMs setup ======

  * Create a 32 bits virtual machine 

<code>
xen-create-image --lvm=datavg --size=4G --memory=256M --swap=256M --dist=wheezy --mirror=http://ftp.fr.debian.org/debian --force --ip=192.168.1.1  --netmask=255.255.255.0 --gateway=192.168.1.254 --hostname=wheezy32bits --kernel=/boot/vmlinuz-3.2.0-4-686-pae --initrd=/boot/initrd.img-3.2.0-4-686-pae --arch=i386 --fs=ext4
</code>

:!: kernel and initrd files can be retrieved here :

  * kernel : [[http://files.ndlp.info/xen/vmlinuz-3.2.0-4-686-pae|vmlinuz-3.2.0-4-686-pae]]
  * initrd : [[http://files.ndlp.info/xen/initrd.img-3.2.0-4-686-pae|initrd.img-3.2.0-4-686-pae]]

===== VM configuration file =====

**/etc/xen/wheezy32bits.cfg**

<code>
#
# Configuration file for the Xen instance wheezy32bits, created
# by xen-tools 4.3.1 on Sun Feb  9 16:25:13 2014.
#

#
#  Kernel + memory size
#
kernel      = '/boot/vmlinuz-3.2.0-4-686-pae'
ramdisk     = '/boot/initrd.img-3.2.0-4-686-pae'

vcpus       = '1'
cpus        = '1,2,3'
memory      = '256M'

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'phy:/dev/datavg/wheezy32bits-disk,xvda2,w',
                  'phy:/dev/datavg/wheezy32bits-swap,xvda1,w',
              ]


#
#  Physical volumes
#


#
#  Hostname
#
name        = 'wheezy32bits'

#
#  Networking
#
vif         = [ 'ip=192.168.1.1 ,vifname=vif1.1' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'
</code>

===== Starting the VM =====

  * with console :

  xm create wheezy32bits.cfg -c

  * without console :

  xm create wheezy32bits.cfg

====== Firewall ======

  * dom0 firewall rules : [[http://www.ndlp.info/_fW_/firewall|firewall]]
  * VMs firewall rules : [[http://www.ndlp.info/_fW_/firewall.VM|firewall.VM]]