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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
+
+=================================
+Disable Swift from the Undercloud
+=================================
+
+The goal of this proposal is to introduce the community to the idea of
+disabling Swift on the TripleO Undercloud. Within this propose we intend
+to provide a high-level overview of how we can accomplish this goal.
+
+
+Problem Description
+===================
+
+Swift is being used to store objects related to the deployment which are
+managed entirely on the Undercloud. In the past, there was an API / UI to
+interact with the deployment tooling; however, with the deprecation of the UI
+and the removal of Mistral this is no longer the case. The Undercloud is
+assumed to be a single node which is used to deploy OpenStack clouds, and
+requires the user to login to the node to run commands. Because we're no longer
+attempting to make the Undercloud a distributed system there's no need for an
+API'able distributed storage service. Swift, in it's current state, is
+under-utilized and carries unnecessary operational and resource overhead.
+
+
+Proposed Change
+===============
+
+Overview
+--------
+
+Decommission Swift from the Undercloud.
+
+To decommission Swift, we'll start by removing all of the `tripleoclient` Swift
+interactions. These interactions are largely storing and retrieving YAML files
+which provide context to the user for current deployment status. To ensure
+we're not breaking deployment expectations, we'll push everything to the local
+file system and retain all of the file properties wherever possible. We will
+need coordinate with tripleo-ansible to ensure we're making all direct Swift
+client and module interactions optional.
+
+Once we're able to remove the `tripleoclient` Swift interactions, we'll move to
+disable Swift interactions from tripleo-common. These interactions are similar
+to the ones found within the `tripleoclient`, though tripleo-common has some
+complexity; we'll need to ensure we're not breaking expectations we've created
+with our puppet deployment methodologies which have some Swift assumptions.
+
+
+Alternatives
+------------
+
+We keep everything as-is.
+
+
+Security Impact
+---------------
+
+There should be no significant security implications when disabling Swift.
+It could be argued that disabling Swift might make the deployment more secure,
+it will lessen the attack surface; however, given the fact that Swift on the
+Undercloud is only used by director I would consider any benefit insignificant.
+
+
+Upgrade Impact
+--------------
+
+There will be no upgrade impact; this change will be transparent to the
+end-user.
+
+
+Other End User Impact
+---------------------
+
+None.
+
+
+Performance Impact
+------------------
+
+Disabling Swift could make some client interactions faster; however, the
+benefit should be negligible. That said, disabling Swift would remove a
+service on the Undercloud, which would make setup faster and reduce the
+resources required to run the Undercloud.
+
+
+Other Deployer Impact
+---------------------
+
+Operationally we should see an improvement as it will no longer be required to
+explore a Swift container, and download files to debug different parts of the
+deployment. All deployment related file artifacts housed within Swift will
+exist on the Undercloud using the local file system, and should be easily
+interacted with.
+
+
+Developer Impact
+----------------
+
+None, if anything disabling Swift should make the life of a TripleO developer
+easier.
+
+
+Implementation
+==============
+
+Excising Swift client interactions will be handled directly in as few reviews
+as possible; hopefully allowing us to backport this change, should it be deemed
+valuable to stable releases.
+
+All of the objects stored within Swift will be stored in
+`/var/lib/tripleo/{named_artifact_directories}`. This will allow us to
+implement all of the same core logic in our various libraries just without the
+use of the API call to store the object.
+
+In terms of enabling us to eliminate swift without having a significant impact
+on the internal API we'll first start by trying to replace the swift object
+functions within tripleo-common with local file system calls. By using the
+existing functions and replacing the backend we'll ensure API compatibility and
+lessen the likely hood of creating regressions.
+
+.. note::
+
+  We'll need to collaborate with various groups to ensure we're porting assumed
+  functionality correctly. While this spec will not go into the specifics
+  implementation details for porting assumed functionality, it should be known
+  that we will be accountable for ensuring existing functionality is ported
+  appropriately.
+
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  cloudnull
+
+Other contributors:
+
+- emilien
+- ekultails
+
+Work Items
+----------
+
+The work items listed here are high level, and not meant to provide specific
+implementation details or timelines.
+
+* Enumerate all of the Swift interactions
+* Create a space on the Undercloud to house the files
+* This location will be on the local file system and will be created into a
+  git archive; git is used for easier debug, rapid rollback, and will
+  provide simple versioning.
+* Create an option to disable Swift on the Undercloud.
+* Convert client interactions to using the local file system
+* Ensure all tripleo-ansible Swift client calls are made optional
+* Convert tripleo-common Swift interactions to using the local file system
+* Disable Swift on the Undercloud
+
+
+Dependencies
+============
+
+Before Swift can be disabled on the Undercloud we will need ensure the
+deployment methodology has been changed to Metalsmith.
+
+
+Testing
+=======
+
+The Swift tests will need to be updated to use the local file system, however
+the existing tests and test structure will be reused.
+
+
+Documentation Impact
+====================
+
+There are several references to Swift in our documentation which we will need to
+update.
+
+
+References
+==========
+
+* https://etherpad.opendev.org/p/tripleo-heat-swift-removal-undercloud
+* http://paste.openstack.org/show/798208