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+.. ============LICENSE_START==========================================
+.. ===================================================================
+.. Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+.. ===================================================================
+.. Licensed under the Creative Commons License, Attribution 4.0 Intl.  (the "License");
+.. you may not use this documentation except in compliance with the License.
+.. You may obtain a copy of the License at
+.. 
+..  https://creativecommons.org/licenses/by/4.0/
+.. 
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS,
+.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+.. See the License for the specific language governing permissions and
+.. limitations under the License.
+.. ============LICENSE_END============================================
+.. ECOMP is a trademark and service mark of AT&T Intellectual Property.
+
+=================
+APPC Chef Adapter
+=================
+
+This wiki provides  documentation regarding the design, capabilities and usage of the Chef Extension for APPC.
+
+The Chef Extension for APPC allows management of VNFs that support Chef through the following two additions:
+
+1. An APPC Chef Adapter 
+2. Chef Directed Graph (DG)
+
+Details of each of these two aspects are listed below:
+
+1. **Chef Directed Graph (DG)**:
+
++------------+--------+
+| Field      | Value  |
++============+========+ 
+| module     | APPC   |
++------------+--------+
+| rpc        | chef   | 
++------------+--------+
+| version    | 3.0.0  | 
++------------+--------+
+
+The inputs that the Chef DG expects are listed  below:
+
+Table 1: Input Parameters to the Chef Directed Graph
+
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| Variable Name       |  Description	                                          | Type       | Comments                                  |
++=====================+===========================================================+============+===========================================+
+| chef-server-address |	 The FQDN of the chef server	                          | Mandatory  | Should be provided by APPC.               |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| chef-organization   |  The chef organization name	                          | Mandatory  | Should be provided by APPC.               |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| chef-username	      |  The username of the chef organization	                  | Mandatory  | Should be provided by APPC.               |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| Environment	      |  A JSON dictionary representing a Chef Environmentobject. | Optional   | To be provided in template by VNF owner.  |
+|                     |  If the VNF action requires loading or modifying Chef     |            |                                           |
+|                     |  environment attributes associated with the VNF, all the  |            |                                           |
+|                     |  relevant information must be provided in this JSON       |            |                                           |
+|                     |  dictionary in a structure that conforms to a Chef        |            |                                           |
+|                     |  Environment Object.                                      |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| Node	              |  A JSON dictionary representing  a Chef Node Object. The  | Mandatory  | To be provided in template by VNF owner.  |
+|                     |  Node JSON dictionary must include the run list to be     |            |                                           |
+|                     |  triggered for the desired VNF action by the push job.    |            |                                           |
+|                     |  It should also include any attributes that need to be    |            |                                           |
+|                     |  configured on the Node Object as part of the VNF action. |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| NodeList	      |  Array of FQDNs that correspond to the endpoints (VMs) of | Mandatory  | To be provided in template.               |
+|                     |  a VNF registered with the Chef Server that need to       |            |                                           |  
+|                     |  trigger a chef-client run as part of the desired         |            |                                           | 
+|                     |  VNF action.                                              |            |                                           | 
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+	
+| CallbackCapable     |	 This field indicates if the chef-client run invoked by   | Optional   | To be provided in template by VNF owner.  |
+|                     |  push job corresponding to the VNF action is  capable of  |            |                                           |
+|                     |  posting results on a callback URL.                       |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| RequestId           |  A unique string associated with the original request     | Optional   | To be provided by APPC.                   |
+|                     |  by ONAP. This key-value pair will be provided by ONAP in |            |                                           |
+|                     |  the environment of the push job request and must be      |            |                                           |
+|                     |  returned as part of the POST message.                    |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| CallbackUrl         |  Currently not used.	                                  | Optional   |			                   |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+	
+| retryTimes	      |  The retry times to query the result of chef push job.	  | Mandatory  | To be provided in template by VNF owner.  |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| retryInterval	      |  The estimate duration to finish the push job. Measure    | Mandatory  | To be provided in template by VNF owner.  |
+|                     |  by milliseconds.                                         |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| GetOutputFlag	      |  Flag which indicates whether ONAP should retrieve output | Mandatory  | To be provided in template by VNF owner.  |
+|                     |  generated in a chef-client run  from Node object         |            |                                           |
+|                     |  attribute node[‘PushJobOutput’] for this VNF action      |            |                                           |
+|                     |  (e.g in Audit).                                          |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+| PushJobFlag	      |  Flag which indicates whether ONAP should trigger         | Mandatory  | To be provided in template by VNF owner.  |
+|                     |  the push job.                                            |            |                                           |
++---------------------+-----------------------------------------------------------+------------+-------------------------------------------+
+
+
+Table 2: Output Variables set by chef DG
+
++-----------------------+-----------------------------------------------------------------+
+| Variable Name	        |  Description                                                    |
++=======================+=================================================================+
+| output.status.code    |  Result of the request : 400 if SUCCESS , 200 if FAILURE.       |
++-----------------------+-----------------------------------------------------------------+
+| output.status.message |  If Cookbook finished, set to corresponding message.            |
+|                       |  If abnormal error, reported in message.                        |
++-----------------------+-----------------------------------------------------------------+
+| output.status.results |  A JSON dictionary with results corresponding to PushJobOutput. |
++-----------------------+-----------------------------------------------------------------+
+
+
+Example:
+
+|image0|
+
+
+2. **APPC Chef Adapter**:
+
+a. Environment set:
+
+  - To connect to the chef server, APPC should load the chef server credentials.
+
+  - The Chef server uses role-based access control to restrict access to objects—nodes, environments, roles, data bags, cookbooks, and so on. So we need load the user's private key to authenticate the permission.
+
+APPC needs to pre-load the SSL certificate and user private key.
+ 
+The file structure is shown below:
+
+|image1|
+
+*chefServerSSL.jks* file saves all the SSL certificates of chef server. In the chef server, please check the chef server setting file at */etc/opscode/chef-server.rb*. The *chef-server.rb* declares where is the SSL certificate. Find the SSL crt file and use keytool to import certificate to the key store. The password of the *chefServerSSL.jks* is "*adminadmin*"
+
+The user private key file should be saved under */opt/appc/bvc/chef/{{CHEF SERVER FQDN}}/{{ORGANIZATION NAME}}* director and the file name should be *{{username}}.pem*.  Please make sure this user have enough permission on the chef server.
+
+.. |image0| image:: images/image0.png
+.. |image1| image:: images/image1.png