Make Rsync For Guest Optional Spec

blueprint rsync-optional

Change-Id: Ia419434a23d1acab5c3732b0a4ef4eef6d10727c

specs/kilo/rsync-optional.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
+
+=============================
+Make Rsync for Guest Optional
+=============================
+
+Blueprint:
+
+https://blueprints.launchpad.net/trove-integration/+spec/rsync-optional
+
+Today, the instance rsyncs the guestagent code and trove-guestagent.conf
+via http://git.io/qI9ivw (or http://git.io/p88Njw)
+
+The proposal is to introduce an alternative that does not require
+guest-to-controller SSH connectivity: bake the guestagent code and
+trove-guestagent.conf into the image.
+
+Problem Description
+===================
+
+In production, permitting SSH connectivity between guests and the
+control-plane is a security no-no. Although trove-integration is considered
+to be only a sample reference implementation, we owe it to deployers to
+provide insight into how to properly secure Trove.
+
+Use Cases
+----------
+
+* As a deployer, I want to avoid ssh connectivity between guests and the
+  control-plane.
+
+Proposed change
+===============
+
+Add additional elements in trove-integration to stage the guestagent code
+and trove-guestagent.conf during the extra-data.d hook, and subsequently
+install them in the install.d hook, vs. relying on upstart/systemd to rsync.
+
+See https://review.openstack.org/#/c/119488/
+
+This is not turned on by default, and therefore is backwards compatible.
+
+Configuration
+-------------
+
+To make use of this functionality, it requires setting GUEST_LOCAL_TROVE_DIR
+and GUEST_LOCAL_TROVE_CONF. The aforementioned values are used in the newly
+introduced diskimage-builder elements.
+
+Database
+--------
+
+No database changes.
+
+Public API
+----------
+
+No public API changes.
+
+Internal API
+------------
+
+No internal API changes.
+
+Guest Agent
+-----------
+
+No Guest Agent changes.
+
+
+Alternatives
+------------
+
+No alternatives.
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Auston McReynolds (amcrn)
+
+Milestones
+----------
+
+Kilo-1
+
+Work Items
+----------
+
+See https://review.openstack.org/#/c/119488/
+
+Dependencies
+============
+
+No dependencies.
+
+
+Testing
+=======
+
+diskimage-builder element additions/changes are not tested via traditional
+means at the moment.
+
+
+Documentation Impact
+====================
+
+No documentation impact.
+
+
+References
+==========
+
+None.