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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
+
+=======================================
+LBaaS Refactor HAProxy namespace driver
+=======================================
+
+https://blueprints.launchpad.net/neutron/+spec/lbaas-refactor-haproxy-namespace-driver-to-new-driver-interface
+
+With the new LBaaS object model and driver interface we no longer have a
+working reference implementation.
+
+Problem description
+===================
+
+Existing HAProxy namespace driver does not implement new LBaaS driver API or
+support multiple listeners load balancer as supported by new LBaaS object
+model.
+
+Proposed change
+===============
+
+Refactor LBaaS HAProxy namespace driver to use new object model driver
+interface.
+
+Use Jinja2 to render HAProxy configuration template, rather than the custom
+configuration generation.
+
+HAProxy configurations may include multiple listeners per load balancer in a
+single HAProxy process.
+
+Separate files in $state_path/lbaas/$lb_uuid/ placing files written by HAProxy
+under $state_path/lbaas/$lb_uuid/run to prepare for storing TLS private keys
+under $state_path/lbaas/$lb_uuid/. Renaming configuration file, PID file and
+statistics socket stored in $state_path/lbaas/$lb_uuid/ to avoid name conflicts
+with Stunnel. Further TLS related changes are outside the scope of this spec.
+The new directory structure will look like this:
+
+::
+
+  $state_path/lbaas/$lb_uuid/
+  $state_path/lbaas/$lb_uuid/haproxy.conf
+  $state_path/lbaas/$lb_uuid/run/
+  $state_path/lbaas/$lb_uuid/run/haproxy.pid
+  $state_path/lbaas/$lb_uuid/run/haproxy_stats.sock
+
+The driver will need to detect if the sock and/or PID files are not present in
+the new locations, and upgrade the running load balancer namespace to this new
+file system. This will result in a brief interruption of load balancer service
+while HAProxy is shutdown and configuration updated.
+
+Further TLS and Layer 7 content filtering/manipulation are outside the scope of
+this spec, but other specs may depend on this.
+
+Alternatives
+------------
+
+Implement a different LBaaS reference driver.
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+Restricting write access to $state_path/lbaas/$lb_uuid/ to root, and placing
+HAProxy modified files in $state_path/lbaas/$lb_uuid/run/.
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+Preformance should remain similar to existing HAProxy namespace driver.
+
+Other deployer impact
+---------------------
+
+The deployer will need to stop the lbaas-agent before while restarting
+neutron-server upgrade the database schema and RPC protocol.
+
+The deployer should also note the interruption in load balancer services and
+each namespace's file system is updated to the new configuration.
+
+Adding Jinja2 requirement for HAProxy namespace driver functionality, this is
+already used within Neutron by the VPNaaS driver.
+
+Developer impact
+----------------
+
+This will significantly affect the HAProxy namespace driver in order to
+accommodate the new driver interface and multiple listeners.
+
+Addition of Jinja2 requirement for LBaaS support may require DevStack updates.
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  https://launchpad.net/~dlundquist
+
+Other contributors:
+  https://launchpad.net/~phillip-toohill
+
+Work Items
+----------
+
+* Develop Jinja2 template for HAProxy configuration.
+* Update HAProxy namespace driver.
+
+
+Dependencies
+============
+
+* LBaaS API and object model improvements
+* LBaaS object model driver changes
+
+Testing
+=======
+
+Implementation of this spec will allow end to end testing of new LBaaS object
+model.
+
+Documentation Impact
+====================
+
+None
+
+References
+==========
+
+* specs/juno/lbaas-api-and-objmodel-improvement.rst
+* specs/juno/lbaas-objmodel-driver-changes.rst