policy documentation Tutorial vDNS

policy documentation Tutorial: Testing the vDNS Use Case in a standalone PDP-D
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Change-Id: Ie6de7bf841e217da2f154eb75e6b30b0d8cef6af
Issue-Id: POLICY-335
Signed-off-by: Saryu Shah <ss3917@att.com>

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+*********************************************************
+Tutorial: Testing the vDNS Use Case in a standalone PDP-D
+*********************************************************
+
+.. contents::
+    :depth: 3
+
+In this tutorial we will go over how to access and start up the PDP-D, setup the prerequisites for the vDNS flow, enable/disable the AAI and SO Simulators that will be used in the vDNS flow, and inject messages to trigger the vDNS flow.
+
+Accessing and starting the PDP-D
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
+
+The first step is to access the docker container of name *drools*.
+
+    .. code-block:: bash
+
+        docker exec -it -u 0 drools su - policy
+
+The PDP-D software is installed under the *policy* account, the policy root directory is under *${POLICY_HOME}* environment variable and it may be changed on a per installation basis.   It is typically set up under the */opt/app/policy* directory but can be changed during installation.   All PDP-D software runs with non-root privileges as *policy* is a regular user account.
+
+Once within the drools container, the running status can be observed by using the *policy* command:
+
+    .. code-block:: bash
+    
+        policy [--debug] status|start|stop
+    
+The running status of the PDP-D can be observed with *policy status*
+
+    .. code-block:: bash
+    
+        policy@drools:~$ policy status [drools-pdp-controllers]  L []: Policy Management (pid 1500) is running  1 cron jobs installed.
+    
+
+Prerequisites for the vDNS flow
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
+
+In order to trigger the vDNS flow we will need to inject an ONSET message via curl command. We're going to create a temporary *util* directory to store a file that contains the vDNS ONSET message.
+
+Navigate to */tmp* and create directory *util*.  *util* is just a temporary folder we've created to use as our 'workspace'.
+
+    .. code-block:: bash
+    
+        cd /tmp
+        mkdir util
+
+
+Next, we're going to create a file named *dcae.vdns.onset.json* and edit it to paste the vDNS ONSET message contents.
+
+    .. code-block:: bash
+    
+        touch dcae.vdns.onset.json
+        vi dcae.vdns.onset json
+
+Here are the contents of the vDNS ONSET message. Copy/paste this into dcae.vdns.onset.json:
+
+    .. code-block:: bash
+    
+        {  "closedLoopEventClient": "DCAE_INSTANCE_ID.dcae-tca",  "target_type": "VNF",  "AAI": {   "vserver.vserver-name": "vlb-lb-32c8",   "vserver.is-closed-loop-disabled": "false"  },  "closedLoopAlarmStart": 1484677482204798,  "closedLoopEventStatus": "ONSET",  "closedLoopControlName": "ControlLoop-vDNS-6f37f56d-a87d-4b85-b6a9-cc953cf779b3",  "version": "1.0.2",  "target": "vserver.vserver-name",  "requestID": "99999999-686e-4790-8c45-bdfa61df770f",  "from": "DCAE" }
+
+
+Enabling the AAI and SO Simulators
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
+
+Enabling the *controlloop-utils* feature will enable the simulators. To do this, simply stop the drools pdp, enable the feature, and restart the drools pdp like so: 
+
+    .. code-block:: bash
+    
+        policy stop
+        features enable controlloop-utils
+        policy start
+
+Now, in */opt/app/policy/config/* directory, you should see a new properties file named *simulators.properties.environment*. In here you will find the credentials for the AAI and SO simulators.
+
+Injecting an ONSET to trigger the vDNS Flow
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
+
+We are now ready to inject an ONSET message to trigger the vDNS flow. Simply navigate back to the directory *dcae.vdns.onset.json* file is saved (i.e. cd /tmp/util) and run this curl command:
+
+    .. code-block:: bash
+    
+        http -a @1b3rt:31nst31n PUT :9696/policy/pdp/engine/topics/sources/ueb/unauthenticated.DCAE_CL_OUTPUT/events @dcae.vdns.onset.json Content-Type:"text/plain"
+
+You should see some output similar to this:
+
+.. image:: tutorial_vDNS_1.png
+
+You can view the logs to see the network activity or find any errors that may have occurred. Logs are located in */opt/app/policy/logs*.
+
+Reading the logs
+^^^^^^^^^^^^^^^^
+
+Once you've injected the onset message, this should appear in the network.log:
+
+.. image:: tutorial_vDNS_2.png
+
+
+End of Document
+
+.. SSNote: Wiki page ref. https://wiki.onap.org/display/DW/Using+guard+in+the+PDP-D