Add spec for YADIFA DNS backend

Implements: bluprint yadifa-dns-backend

Change-Id: Id2e7b8cdd67baeabd2c0dc222c0c0a43fa95dfc9

doc/source/index.rst

@@ -44,6 +44,14 @@ Newton approved specs:
 
    specs/newton/*
 
+Ocata approved specs:
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   specs/ocata/*
+
 ==================
 Indices and tables
 ==================

specs/ocata/yadifa-backend.rst

@@ -0,0 +1,112 @@
+..
+
+This work is licensed under a Creative Commons Attribution 3.0 Unported License.
+http://creativecommons.org/licenses/by/3.0/legalcode
+
+..
+
+=========================================
+Integrate yadifa dns backend to designate
+=========================================
+
+https://blueprints.launchpad.net/designate/+spec/yadifa-dns-backend
+
+
+
+Problem description
+===================
+
+There are users or env that may want to use YADIFA as backend which is not supported by designate
+as of now.
+
+Proposed change
+===============
+
+YADIFA is a lightweight authoritative Name Server with DNSSEC capabilities.
+It has a simple configuration syntax and can handle more queries per second while
+maintaining one of the lowest memory footprints in the industry.
+YADIFA also has one of the fastest zone file load times ever recorded on a name server.
+
+Functionality:
+    . authoritative name server
+    . DNS UPDATE
+    . DNS NOTIFY
+    . AXFR
+    . IXFR
+    . full featured client (yadifa), which can be used to control the server
+    . key management, including a tool to generate dnssec keys
+    . multi-master support
+    . support for other network models
+    . detect and configure hyperthreading
+    . support for openssl 1.1.0 API
+
+Use Cases:
+    (1) Alternative for BIND and NSD for public TLD slave.
+        - Clean Implementation
+        - High query rate and portable.
+        - RFC compliant:
+        -  . Authoritative
+        -  . DNSSEC support
+        -  . AXFR/IXFR (master and slave)
+
+    (2) Dynamic updates
+        - Dynamic updated(including continuous signing)
+        - Generic, extensible storage backend.
+
+    (3) Zone management
+        - Dynamic zone provisioning.
+
+    (4) Recursive Nameserver
+        - Recursion
+        - Validation
+
+
+API Changes
+-----------
+N/A
+
+Central Changes
+---------------
+N/A
+
+Storage Changes
+---------------
+N/A
+
+Other Changes
+-------------
+Add driver ‘impl_yadifa’ to designate.backends using v2 api .
+Authentication is done via the keystoneclient auth / session using the provided
+credentials in the backend options.
+
+Add designate devstack plugin 'backend-yadifa' to configure yadifa as backend
+while installing designate using devstack. Also add docs related to installation
+and configuration of yadifa dns backend.
+
+Alternatives
+------------
+N/A
+
+Implementation
+--------------
+N/A
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Sonu kumar https://launchpad.net/~sonu-bhumca11
+
+IRC Nick Name:
+  sonuk
+
+Milestones
+----------
+Target Milestone for completion:
+
+Work Items
+----------
+    . Create YADIFA backend
+    . Create YADIFA backend docs
+    . Create Devstack backend plugin for YADIFA
+    . Create experimental gate job