Difference between revisions of "GlanceSupportForXS"

Revision as of 12:41, 18 November 2010

• Launchpad Entry: NovaSpec:bexar-glance-support-xenserver
• Created: 16 November 2010
• Contributors: Zhixue Wu

Summary

Release Note

By implementing support for XenServer to pull out images from Glance will enable users to use Swift, or any other object stores supported by Glance, for storing their images to be used by compute nodes.

Rationale

Glance provides an image registration and discovery service (Parallax) and an image delivery service (Teller). These services are used in conjunction by Nova to deliver images from object stores, such as Swift service, to Nova’s compute nodes.

Currently, XenServer for OpenStack fetches images from the OpenStack local object store. This implementation will enable XenServer to use Glance services to fetch images registered in Swift, or other object stores supported by Glance.

User stories

XenServer users could take advantage of Glance to register and manager their images.

Assumptions

Glance integration with Nova in Bexar

Design

virt.xenapi and its plugin are self contained. The new implementation only needs to ensure to connect to the Glance services and use their API to fetch images.

Implementation

Rework virt.xenapi and the XenAPI plugin for fetching images.

UI Changes

There should be no visible changes to the end users.

Code Changes

Code changes should be isolated to xenapi component in the virt module and XenAPI plugin for fetching images.

Migration

Migration once when the implementation nears beta.

The only change for users is that they could register their images to Swift when Glance is integrated with Nova.

Test/Demo Plan

Unit tests will be provided as code is developed.

Unresolved issues

None.