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Wednesday, May 20 • 3:30pm - 4:10pm
Metadata tagging in Cinder

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Nova looks at and uses image metadata on bootable volumes (managed by Glance) for scheduling as well as for passing along to the individual compute drivers. Cinder volumes have different types of metadata (properties) like user and image metadata for example. In this session, we will see how metadata tagging in Cinder will provide a way for the user to define which bootable volume is preferred and also be helpful for setting device driver options.


One typical use case is Watchdog Behavior. For the libvirt driver, you can enable and set the behavior of a virtual hardware watchdog device for each flavor. Watchdog devices keep an eye on the guest server, and carry out the configured action if the server hangs. The watchdog uses the i6300esb device (emulating a PCI Intel 6300ESB). If ‘hw_watchdog_action’ is not specified, the watchdog is disabled. Watchdog behavior set using a specific image's properties will override behavior set using flavors


This capability is being offered through command tools for the end user to define and modify Cinder volume image metadata. The CRUD APIs against image metadata will be provided in Cinder, and there will be properties protection mechanism imported to prevent modification against sensitive metadata, such as license key. This is being targeted for the OpenStack ‘K’ release in April.

See https://review.openstack.org/#/c/136253/16/specs/kilo/support-modify-volume-image-metadata.rst

avatar for Dave Chen

Dave Chen

Software Engineer
Dave is a cloud engineer in Intel OTC(OpenSource Technology Center). Dave is based in Shanghai and focus on cloud storage and security for more than three years, he joined Intel in 2011 year.

Wednesday May 20, 2015 3:30pm - 4:10pm PDT
Room 109

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