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---
features:
- |
This release adds client support for the Glance feature
`multi-store backend support
<https://specs.openstack.org/openstack/glance-specs/specs/rocky/approved/glance/multi-store.html>`_,
introduced in the Rocky release. This feature allows end users
to direct uploaded or imported image data to a particular backend
when a cloud operator has configured the Image Service to use multiple
backends.
The available backends are discoverable by making the ``stores-info``
call, which will return a list of available backends. The list contains
an identifier (``id``) and a ``description`` of each available
backend. The default backend is indicated in this response.
When uploading or importing an image, the glanceclient now accepts
the ``--backend`` option. Its value must be the ``id`` of a backend
configured in the cloud against which the call is being made. This
option may also be configured by exporting the ``OS_IMAGE_BACKEND``
environment variable with the ``id`` of a configured backend as its
value.
Some other points to keep in mind:
- If no backend is specified, the image data is stored in the
default backend.
- If the version of the Image Service API contacted does not
support multi-store backends, the option is silently ignored
and the image data is stored in the default backend.
- If an invalid backend identifier is used, the glanceclient will
exit with an error message.
- Backend identifiers and their meanings are unique to each cloud.
Consult the ``stores-info`` call and your cloud provider's
documentation for details.
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