Write A-B configuration guide and align with SDC guideopnfv-6.0.0

- Document A-B sample validation script
- Remove redundant TOC in docs
- Provide reference links in SDC guide
- Additional edits to SDC guide

Change-Id: Id4135c99df688f7de1af18017c847a6546082bfc
Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

1 files changed, 92 insertions, 10 deletions

diff --git a/docs/release/configguide/a_b_config_guide.rst b/docs/release/configguide/a_b_config_guide.rst
index b23afb7..2535ef2 100644
--- a/docs/release/configguide/a_b_config_guide.rst
+++ b/docs/release/configguide/a_b_config_guide.rst
@@ -1,19 +1,101 @@
 .. This work is licensed under a Creative Commons Attribution 4.0 International License.
 .. http://creativecommons.org/licenses/by/4.0
 .. SPDX-License-Identifier CC-BY-4.0
-.. (c) optionally add copywriters name
+.. (c) Authors of Clover
 
 .. _a_b_config_guide:
 
+=========================================
+A-B Sample Validation Configuration Guide
+=========================================
+
+Istio supports the ability to have multiple service versions, which allows for use-cases
+such as staging services and moving to production when newer versions are vetted. Multiple variants
+of a service can run in parallel and Istio can perform request routing between the variants
+using configured route rules.
+
+This script sets up route rules between the two load balancer versions (http-lb-v1/v2) in the
+Service Delivery Controller (SDC) sample to modify the ratio of incoming request traffic to send
+to each. It then employs the overall request/response times obtained from the tracing module to
+validate the response time performance of v2 is within 120% of v1. The 120% condition can be
+configured in an input configuration yaml.
+
+Using the sample script
 =======================
-A-B Configuration Guide
-=======================
 
-This is a placeholder file for now
+Prerequisites
+-------------
+
+The following assumptions must be met before executing the sample script:
+
+ * The prerequisites stipulated at :ref:`sdc_prerequisites` are considered. The use of flannel
+   as the CNI network add-on is required.
+ * Ensure the SDC sample is deployed. The easiest way to accomplish this is using the Clover
+   container outlined in the SDC guide at :ref:`sdc_deploy_container`.
+ * Deploy Jaeger tracing and determine the tracing port. The instructions in the SDC guide
+   at :ref:`sdc_view_container` can be used for this purpose. The exposed tracing port is
+   required as the ``-p`` argument in the script.
+ * The http-lb-v2 in the SDC sample is load balancing across clover-server4/5 using the
+   command outlined at :ref:`sdc_modify_lb`
+ * Ensure Istio is in the path by downloading Istio separately into a directory with the
+   commands below:
+
+.. code-block:: bash
+
+    $ curl -L https://github.com/istio/istio/releases/download/0.6.0/istio-0.6.0-linux.tar.gz | tar xz
+    $ cd istio-0.6.0
+    $ export PATH=$PWD/bin:$PATH
+
+Environment setup
+------------------
+
+First setup the environment using the Clover source with the following commands:
+
+.. code-block:: bash
+
+    $ git clone https://gerrit.opnfv.org/gerrit/clover
+    $ cd clover
+    $ git checkout stable/fraser
+    $ pip install .
+    $ cd clover
+
+Edit the input configuration yaml file located at ``test/yaml/fraser_a_b_test.yaml``
+and modify the value under the ``params`` key with the istio-ingress port obtained using
+the SDC guide at :ref:`sdc_ingress_port`. The example of port 32580 is shown below in bold.
+
+.. code-block:: bash
+
+    traffic-test:
+      name: lb-test.sh
+      params:
+        - 10.244.0.1
+        - **32580**
+
+Execute toplevel script
+-----------------------
+
+To execute the script, use the command:
+
+.. code-block:: bash
+    $ python test/fraser_a_b_test.py -t test/yaml/fraser_a_b_test.yaml -p 30869
+
+The value to the argument ``-p`` must be the tracing port exposed outside of the Kubernetes
+cluster.
+
+Results
+-------
+
+The script uses ``wget`` to make twenty HTTP GET requests to the SDC sample. It fetches the
+total response time for the service mesh to respond to requests using the Clover tracing module
+and calculates and average. The script will pass if performance of http-lb-v2 has response times
+within 120% of v1 and fail otherwise.
+
+Troubleshooting
+===============
+
+If the script fails because a route rule with the same name exists from a
+previous test run, use the following command to delete the rule before executing the
+sample script::
+
+    istioctl -n default delete routerules lb-default
 
-- ensure Istio is in the path
-- ensure old route rule deleted
-- istioctl -n default delete routerules lb-default
-- redis port forward
-- clover/test/yaml/fraser_a_b_test.yaml
-- change ingress port