model of using this OS but currently the OS interface in ganeti is
limiting.
+Example
++++++++
+
+To create a Ubuntu 12.04 (precise) instance, your
+``/etc/default/ganeti-instance-debootstrap`` file will contain::
+
+ MIRROR="http://archive.ubuntu.com/ubuntu/"
+ SUITE="precise"
+ COMPONENTS="main,universe"
+ ARCH="amd64"
+
Customization of the instance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~