Before you can run OpenStack with XenServer, you must install the hypervisor on an appropriate server . Xen is a type 1 hypervisor: When your server starts, Xen is the first software that runs. Consequently, you must install XenServer before you install the operating system where you want to run OpenStack code. You then install nova-compute into a dedicated virtual machine on the host. Use the following link to download XenServer's installation media: http://xenserver.org/open-source-virtualization-download.html When you install many servers, you might find it easier to perform PXE boot installations . You can also package any post-installation changes that you want to make to your XenServer by following the instructions of creating your own XenServer supplemental pack . Make sure you use the EXT type of storage repository (SR). Features that require access to VHD files (such as copy on write, snapshot and migration) do not work when you use the LVM SR. Storage repository (SR) is a XAPI-specific term relating to the physical storage where virtual disks are stored. On the XenServer installation screen, choose the XenDesktop Optimized option. If you use an answer file, make sure you use srtype="ext" in the installation tag of the answer file.

The following steps need to be completed after the hypervisor's installation: For resize and migrate functionality, enable password-less SSH authentication and set up the /images directory on dom0. Install the XAPI plug-ins. To support AMI type images, you must set up /boot/guest symlink/directory in dom0. Create a paravirtualized virtual machine that can run nova-compute. Install and configure nova-compute in the above virtual machine.