Add example for Ubuntu instance

Add an example which outlines how to used ganeti-instance-deboostrap to
install Ubuntu 12.04 (precise).

Signed-off-by: Thomas Thrainer <thomasth@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>

diff --git a/README b/README
index 34badc2..d7df90b 100644 (file)
--- a/README
+++ b/README
@@ -86,6 +86,17 @@ is installed on, not the cluster master. This is indeed not a very good
 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
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~