de8a882ce7
Interoperable image import process are introduced in the Image API v2.6. It mainly allow image importing from an external url and let Image Service download it by itself without sending binary data at image creation. This commit will add a method import_image in both Image resource and proxy. I also add a simple create_image proxy function for creating an image without uploading it's data, as it is not required in glance API. Change-Id: Idee9bea3f1f5db412e0ecd2105adff316aef4c4b Story: 2005085 Task: 29671
98 lines
3.5 KiB
ReStructuredText
98 lines
3.5 KiB
ReStructuredText
Using OpenStack Image
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=====================
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Before working with the Image service, you'll need to create a connection
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to your OpenStack cloud by following the :doc:`connect` user guide. This will
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provide you with the ``conn`` variable used in the examples below.
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The primary resource of the Image service is the image.
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List Images
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-----------
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An **image** is a collection of files for a specific operating system
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that you use to create or rebuild a server. OpenStack provides
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`pre-built images <http://docs.openstack.org/image-guide/obtain-images.html>`_.
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You can also create custom images, or snapshots, from servers that you have
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launched. Images come in different formats and are sometimes called virtual
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machine images.
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.. literalinclude:: ../examples/image/list.py
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:pyobject: list_images
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Full example: `image resource list`_
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Create Image
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------------
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Create an image by uploading its data and setting its attributes.
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.. literalinclude:: ../examples/image/create.py
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:pyobject: upload_image
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Full example: `image resource create`_
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Create Image via interoperable image import process
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---------------------------------------------------
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Create an image then use interoperable image import process to download data
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from a web URL.
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For more information about the image import process, please check
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`interoperable image import`_
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.. literalinclude:: ../examples/image/import.py
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:pyobject: import_image
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Full example: `image resource import`_
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.. _download_image-stream-true:
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Downloading an Image with stream=True
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-------------------------------------
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As images are often very large pieces of data, storing their entire contents
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in the memory of your application can be less than desirable. A more
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efficient method may be to iterate over a stream of the response data.
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By choosing to stream the response content, you determine the ``chunk_size``
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that is appropriate for your needs, meaning only that many bytes of data are
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read for each iteration of the loop until all data has been consumed.
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See :meth:`requests.Response.iter_content` for more information.
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When you choose to stream an image download, openstacksdk is no longer
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able to compute the checksum of the response data for you. This example
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shows how you might do that yourself, in a very similar manner to how
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the library calculates checksums for non-streamed responses.
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.. literalinclude:: ../examples/image/download.py
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:pyobject: download_image_stream
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Downloading an Image with stream=False
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--------------------------------------
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If you wish to download an image's contents all at once and to memory,
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simply set ``stream=False``, which is the default.
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.. literalinclude:: ../examples/image/download.py
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:pyobject: download_image
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Full example: `image resource download`_
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Delete Image
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------------
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Delete an image.
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.. literalinclude:: ../examples/image/delete.py
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:pyobject: delete_image
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Full example: `image resource delete`_
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.. _image resource create: http://git.openstack.org/cgit/openstack/openstacksdk/tree/examples/image/create.py
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.. _image resource import: http://git.openstack.org/cgit/openstack/openstacksdk/tree/examples/image/import.py
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.. _image resource delete: http://git.openstack.org/cgit/openstack/openstacksdk/tree/examples/image/delete.py
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.. _image resource list: http://git.openstack.org/cgit/openstack/openstacksdk/tree/examples/image/list.py
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.. _image resource download: http://git.openstack.org/cgit/openstack/openstacksdk/tree/examples/image/download.py
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.. _interoperable image import: https://docs.openstack.org/glance/latest/admin/interoperable-image-import.html
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