Spec for support-keystoneclient-option.rst

Change-Id: Ifdbc2f33d3811d56c842f0bb8922398e022c1311

specs/train/approved/support-keystoneclient-option.rst

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+..
+   This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=============================
+Support keystoneclient option
+=============================
+
+https://blueprints.launchpad.net/watcher/+spec/support-keystoneclient-option
+
+
+Currently, users can modify the default parameters through the configuration
+file when creating novaclient and cinderclient, but it is not allowed when
+creating keystoneclient.
+
+
+Problem description
+===================
+
+The type of endpoint and region name can not be set when creating
+keystoneclient. Users may want to modify these parameters in different
+demand scenarios.
+
+Use Cases
+----------
+
+As a user of Watcher, I want to specify the type of endpoint and region name
+when creating keystoneclient by the configuration file.
+
+As a user of Watcher, I want to specify the type of endpoint as internal
+when creating keystoneclient by the configuration file.
+
+As a user of Watcher, I want to specify the value of region name as RegionTwo
+when creating keystoneclient by the configuration file.
+
+
+Proposed change
+===============
+
+Allow specifying the type of endpoint and region name when creating
+keystoneclient by exposing new configuration parameter. These parameters
+will be part of a new group labeled keystone_client.
+
+::
+
+    [keystone_client]
+    interface = internal
+    region_name = RegionOne
+
+The interface will default to admin since that is what is used today:
+
+https://github.com/openstack/python-keystoneclient/blob/3.15.0/keystoneclient/httpclient.py#L251
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  <chenker>
+
+Work Items
+----------
+
+* Add the definition and register of keystone_client group.
+
+* Add the definition and register of keystone_client option.
+
+* Update the default access method of keystone_client option.
+
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+* Determine if keystone_client option is used correctly.
+
+
+Documentation Impact
+====================
+
+Documentation on configuration parameters will need to be updated to reflect
+the new parameters.
+
+
+References
+==========
+
+https://review.opendev.org/#/c/658102/
+
+
+History
+=======
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Train
+     - Introduced