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+
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+*************************
+Feature: Healthcheck
+*************************
+
+.. contents::
+ :depth: 3
+
+Summary
+^^^^^^^
+The Healthcheck feature provides reports used to verify the health of *PolicyEngine.manager* in addition to the construction, operation, and deconstruction of HTTP server/client objects.
+
+Usage
+^^^^^
+
+When enabled, the feature takes as input a properties file named "*feature-healtcheck.properties*" (example below). This file should contain configuration properties necessary for the construction of HTTP client and server objects.
+
+Upon initialization, the feature first constructs HTTP server and client objects using the properties from its properties file. A healthCheck operation is then triggered. The logic of the healthCheck verifies that *PolicyEngine.manager* is alive, and iteratively tests each HTTP server object by sending HTTP GET requests using its respective client object. If a server returns a "200 OK" message, it is marked as "healthy" in its individual report. Any other return code results in an "unhealthy" report.
+
+After the testing of the server objects has completed, the feature returns a single consolidated report.
+
+
+ .. code-block:: bash
+ :caption: feature-healthcheck.properties
+ :linenos:
+
+ ###
+ # ============LICENSE_START=======================================================
+ # feature-healthcheck
+ # ================================================================================
+ # Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ # ================================================================================
+ # Licensed under the Apache License, Version 2.0 (the "License");
+ # you may not use this file except in compliance with the License.
+ # You may obtain a copy of the License at
+ #
+ # http://www.apache.org/licenses/LICENSE-2.0
+ #
+ # 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=========================================================
+ ###
+
+ http.server.services=HEALTHCHECK
+ http.server.services.HEALTHCHECK.host=0.0.0.0
+ http.server.services.HEALTHCHECK.port=6969
+ http.server.services.HEALTHCHECK.restClasses=org.onap.policy.drools.healthcheck.RestHealthCheck
+ http.server.services.HEALTHCHECK.managed=false
+ http.server.services.HEALTHCHECK.swagger=true
+ http.server.services.HEALTHCHECK.userName=healthcheck
+ http.server.services.HEALTHCHECK.password=zb!XztG34
+
+ http.client.services=PAP,PDP
+
+ http.client.services.PAP.host=pap
+ http.client.services.PAP.port=9091
+ http.client.services.PAP.contextUriPath=pap/test
+ http.client.services.PAP.https=false
+ http.client.services.PAP.userName=testpap
+ http.client.services.PAP.password=alpha123
+ http.client.services.PAP.managed=true
+
+ http.client.services.PDP.host=pdp
+ http.client.services.PDP.port=8081
+ http.client.services.PDP.contextUriPath=pdp/test
+ http.client.services.PDP.https=false
+ http.client.services.PDP.userName=testpdp
+ http.client.services.PDP.password=alpha123
+ http.client.services.PDP.managed=false
+
+
+To utilize the healthcheck functionality, first stop policy engine and then enable the feature using the "*features*" command.
+
+ .. code-block:: bash
+ :caption: Enabling Healthcheck feature
+
+ policy@hyperion-4:/opt/app/policy$ policy stop
+ [drools-pdp-controllers]
+ L []: Stopping Policy Management... Policy Management (pid=354) is stopping... Policy Management has stopped.
+ policy@hyperion-4:/opt/app/policy$ features enable healthcheck
+ name version status
+ ---- ------- ------
+ controlloop-utils 1.1.0-SNAPSHOT disabled
+ healthcheck 1.1.0-SNAPSHOT enabled
+ test-transaction 1.1.0-SNAPSHOT disabled
+ eelf 1.1.0-SNAPSHOT disabled
+ state-management 1.1.0-SNAPSHOT disabled
+ active-standby-management 1.1.0-SNAPSHOT disabled
+ session-persistence 1.1.0-SNAPSHOT disabled
+
+
+The output of the enable command will indicate whether or not the feature was enabled successfully.
+
+Policy engine can then be started as usual.
+
+The Healthcheck can also be invoked manually as follows:
+
+ .. code-block:: bash
+ :caption: Manual Healthcheck invokation
+
+
+ # Assuming the healthcheck service credentials have not been changed
+ # post-installation within the drools container
+
+ source /opt/app/policy/config/feature-healthcheck.conf.environment
+ curl -k --silent --user "${HEALTHCHECK_USER}:${HEALTHCHECK_PASSWORD}" -X GET https://localhost:6969/healthcheck | python -m json.tool
+
+
+End of Document
+
+.. SSNote: Wiki page ref. https://wiki.onap.org/display/DW/Feature+Healthcheck