2015-12-04 22:05:41 +08:00
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=======================================
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Flavor Extra Specs and Image Properties
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=======================================
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2019-11-22 17:15:45 -05:00
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Flavor extra specs and image properties are used to control certain aspects
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or scheduling behavior for a server.
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The flavor of a server can be changed during a
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:nova-doc:`resize </user/resize>` operation.
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The image of a server can be changed during a
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:nova-doc:`rebuild </contributor/evacuate-vs-rebuild>` operation.
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By default, flavor extra specs are controlled by administrators of the cloud.
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If users are authorized to upload their own images to the image service, they
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may be able to specify their own image property requirements.
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There are many cases of flavor extra specs and image properties that are for
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the same functionality. In many cases the image property takes precedence over
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the flavor extra spec if both are used in the same server.
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2015-12-04 22:05:41 +08:00
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Flavor Extra Specs
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==================
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2019-11-22 17:15:45 -05:00
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Refer to the :nova-doc:`user guide </user/flavors.html#extra-specs>` for a
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list of official extra specs.
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While there are standard extra specs, deployments can define their own extra
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specs to be used with host aggregates and custom scheduler filters as
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necessary. See the
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:nova-doc:`reference guide </reference/scheduler-hints-vs-flavor-extra-specs>`
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for more details.
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2015-12-04 22:05:41 +08:00
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Image Properties
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================
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2019-11-22 17:15:45 -05:00
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Refer to the image service documentation for a list of official
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:glance-doc:`image properties </admin/useful-image-properties>` and
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:glance-doc:`metadata definition concepts </user/metadefs-concepts>`.
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Unlike flavor extra specs, image properties are standardized in the compute
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service and thus they must be `registered`_ within the compute service before
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they can be used.
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.. _registered: https://opendev.org/openstack/nova/src/branch/master/nova/objects/image_meta.py
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