doc: remove detail about extensions
As extensions are already deprecated in Nova, this patch removes all of the details about extensions, adds a note about the deprecation of extensions, and points to documentation about microversions for discovering API changes. blueprint complete-todo-in-api-concept-doc Co-Author: Ed Leafe <ed@leafe.com> Change-Id: I56acfeac5b8b3312547c06d79962a79991c5c8f3
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He Jie Xu
Sean Dague
parent
523e8ed5c0
commit
d04f7f7e12
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@ -2,146 +2,10 @@
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Extensions
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==========
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The OpenStack Compute API v2.0 is extensible. Extensions serve two purposes:
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They allow the introduction of new features in the API without requiring
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a version change and they allow the introduction of vendor specific
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niche functionality. Applications can programmatically list available
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extensions by performing a **GET** on the ``/extensions`` URI. Note that
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this is a versioned request; that is, an extension available in one API
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version might not be available in another.
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Extensions may also be queried individually by their unique alias. This
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provides the simplest method of checking if an extension is available
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because an unavailable extension issues an itemNotFound (404)
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response.
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Extensions may define new data types, parameters, actions, headers,
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states, and resources.
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NOTE: Extensions is a deprecated concept in Nova and their support
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will be removed in a future version. If your product or cloud relies
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on extensions you should work on getting those features into the main
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upstream project.
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Important
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~~~~~~~~~
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Applications should ignore response data that contains extension
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elements. An extended state should always be treated as an ``UNKNOWN``
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state if the application does not support the extension. Applications
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should also verify that an extension is available before submitting an
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extended request.
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**Example: Extended server: JSON response**
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.. code::
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{
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"servers": [
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{
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"id": "52415800-8b69-11e0-9b19-734f6af67565",
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"tenant_id": "1234",
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"user_id": "5678",
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"name": "sample-server",
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"updated": "2010-10-10T12:00:00Z",
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"created": "2010-08-10T12:00:00Z",
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"hostId": "e4d909c290d0fb1ca068ffaddf22cbd0",
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"status": "BUILD",
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"progress": 60,
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"accessIPv4" : "67.23.10.132",
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"accessIPv6" : "::babe:67.23.10.132",
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"image" : {
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"id": "52415800-8b69-11e0-9b19-734f6f006e54",
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"links": [
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{
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"rel": "self",
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"href": "http://servers.api.openstack.org/v2/1234/images/52415800-8b69-11e0-9b19-734f6f006e54"
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},
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{
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"rel": "bookmark",
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"href": "http://servers.api.openstack.org/1234/images/52415800-8b69-11e0-9b19-734f6f006e54"
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}
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]
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},
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"flavor" : {
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"id": "52415800-8b69-11e0-9b19-734f216543fd",
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"links": [
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{
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"rel": "self",
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"href": "http://servers.api.openstack.org/v2/1234/flavors/52415800-8b69-11e0-9b19-734f216543fd"
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},
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{
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"rel": "bookmark",
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"href": "http://servers.api.openstack.org/1234/flavors/52415800-8b69-11e0-9b19-734f216543fd"
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}
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]
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},
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"addresses": {
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"public" : [
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{
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"version": 4,
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"addr": "67.23.10.132"
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},
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{
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"version": 6,
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"addr": "::babe:67.23.10.132"
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},
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{
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"version": 4,
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"addr": "67.23.10.131"
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},
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{
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"version": 6,
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"addr": "::babe:4317:0A83"
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}
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],
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"private" : [
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{
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"version": 4,
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"addr": "10.176.42.16"
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},
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{
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"version": 6,
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"addr": "::babe:10.176.42.16"
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}
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]
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},
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"metadata": {
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"Server Label": "Web Head 1",
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"Image Version": "2.1"
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},
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"links": [
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{
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"rel": "self",
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"href": "http://servers.api.openstack.org/v2/1234/servers/52415800-8b69-11e0-9b19-734f6af67565"
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},
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{
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"rel": "bookmark",
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"href": "http://servers.api.openstack.org/1234/servers/52415800-8b69-11e0-9b19-734f6af67565"
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}
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],
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"RS-CBS:volumes": [
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{
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"name": "OS",
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"href": "https://cbs.api.rackspacecloud.com/12934/volumes/19"
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},
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{
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"name": "Work",
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"href": "https://cbs.api.rackspacecloud.com/12934/volumes/23"
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}
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]
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}
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]
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}
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**Example: Extended action: JSON response**
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.. code::
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{
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"RS-CBS:attach-volume":{
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"href":"https://cbs.api.rackspacecloud.com/12934/volumes/19"
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}
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}
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Extensions are a deprecated concept in Nova. Support for extensions will be
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removed in a future release. In order to keep backwards-compatibility with
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legacy V2 API users, the ``extension_info`` API will remain as part of the
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Compute API. However, API extensions will not be supported anymore;
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there is only one standard API now. For the current V2.1 API, ``Microversions``
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are the new mechanism for implementing API features and changes. For more
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detail about microversions, please refer to :doc:`microversions`.
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