in Planet Linux OpenSource Debian xen ~ read.

Taking Xen guests (domU) alive via routed network

The xend config looks like this:

playground:~# grep -v ^# /etc/xen/xend-config.sxp  
(network-script 'network-bridge netdev=dummy0')
(vif-script vif-bridge)
(dom0-min-mem 196)
(dom0-cpus 0)

Creating volume group for Xen domU (/dev/hdb2 was allready created with id 8e):

playground:~# pvcreate /dev/hdb2  
  Physical volume "/dev/hdb2" successfully created
playground:~# vgcreate xen-vol /dev/hdb2  
  Volume group "xen-vol" successfully created
playground:~# vgscan  
  Reading all physical volumes.  This may take a while...
  Found volume group "xen-vol" using metadata type lvm2

Creating first domU:

playground:~# xen-create-image --ip --hostname  
General Infomation  
Hostname       :  
Distribution   :  etch  
Fileystem Type :  ext3  
Size Information  
Image size     :  4Gb  
Swap size      :  1024Mb  
Image type     :  full  
Memory size    :  128Mb  
Kernel path    :  /boot/vmlinuz-2.6.18-4-xen-vserver-686  
Initrd path    :  /boot/initrd.img-2.6.18-4-xen-vserver-686  
Networking Information  
IP Address 1   :  
Netmask        :  
Gateway        :  
Creating ext3 filesystem on /dev/xen-vol/  
Installing your system with debootstrap mirror  
Running hooks  
No role script specified.  Skipping  
Creating Xen configuration file  
Setting up root password  
Enter new UNIX password:  
Retype new UNIX password:  
passwd: password updated successfully  
All done  
Logfile produced at:  

Add the following to /etc/network/interfaces:

auto dummy0
iface dummy0 inet static

Bringing up network interface, restarting xen and starting the domU:

playground:~# ifup dummy0
playground:~# /etc/init.d/xendomains stop
playground:~# /etc/init.d/xend restart
playground:~# /etc/init.d/xendomains start
playground:~# xm create -c
Using config file "/etc/xen/".

If you want to autostart your domUs, you have to symlink the configfile to /etc/xen/auto:

playground:~# mkdir /etc/xen/auto/
playground:~# ln -s /etc/xen/ /etc/xen/auto/