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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Doctor Configuration
+====================
+
+OPNFV installers install most components of Doctor framework including
+OpenStack Nova, Neutron and Cinder (Doctor Controller) and OpenStack
+Ceilometer and Aodh (Doctor Notifier) except Doctor Monitor.
+
+After major components of OPNFV are deployed, you can setup Doctor functions
+by following instructions in this section. You can also learn detailed
+steps in setup_installer() under `doctor/tests`_.
+
+.. _doctor/tests: https://gerrit.opnfv.org/gerrit/gitweb?p=doctor.git;a=tree;f=tests;
+
+Doctor Inspector
+----------------
+
+You need to configure one of Doctor Inspector below.
+
+**Doctor Sample Inspector**
+
+Sample Inspector is intended to show minimum functions of Doctor Inspector.
+
+Doctor Sample Inspector suggested to be placed in one of the controller nodes,
+but it can be put on any host where Doctor Monitor can reach and access
+the OpenStack Controller (Nova).
+
+Make sure OpenStack env parameters are set properly, so that Doctor Inspector
+can issue admin actions such as compute host force-down and state update of VM.
+
+Then, you can configure Doctor Inspector as follows:
+
+.. code-block:: bash
+
+    git clone https://gerrit.opnfv.org/gerrit/doctor -b stable/danube
+    cd doctor/tests
+    INSPECTOR_PORT=12345
+    python inspector.py $INSPECTOR_PORT > inspector.log 2>&1 &
+
+**Congress**
+
+OpenStack `Congress`_ is a Governance as a Service (previously Policy as a
+Service). Congress implements Doctor Inspector as it can inspect a fault
+situation and propagate errors onto other entities.
+
+.. _Congress: https://wiki.openstack.org/wiki/Congress
+
+Congress is deployed by OPNFV installers. You need to enable doctor
+datasource driver and set policy rules. By the example configuration below,
+Congress will force down nova compute service when it received a fault event
+of that compute host. Also, Congress will set the state of all VMs running on
+that host from ACTIVE to ERROR state.
+
+.. code-block:: bash
+
+    openstack congress datasource create doctor doctor
+
+    openstack congress policy rule create \
+        --name host_down classification \
+        'host_down(host) :-
+            doctor:events(hostname=host, type="compute.host.down", status="down")'
+
+    openstack congress policy rule create \
+        --name active_instance_in_host classification \
+        'active_instance_in_host(vmid, host) :-
+            nova:servers(id=vmid, host_name=host, status="ACTIVE")'
+
+    openstack congress policy rule create \
+        --name host_force_down classification \
+        'execute[nova:services.force_down(host, "nova-compute", "True")] :-
+            host_down(host)'
+
+    openstack congress policy rule create \
+        --name error_vm_states classification \
+        'execute[nova:servers.reset_state(vmid, "error")] :-
+            host_down(host),
+            active_instance_in_host(vmid, host)'
+
+Doctor Monitor
+--------------
+
+**Doctor Sample Monitor**
+
+Doctor Monitors are suggested to be placed in one of the controller nodes,
+but those can be put on any host which is reachable to target compute host and
+accessible by the Doctor Inspector.
+You need to configure Monitors for all compute hosts one by one.
+
+Make sure OpenStack env parameters are set properly, so that Doctor Inspector
+can issue admin actions such as compute host force-down and state update of VM.
+
+Then, you can configure the Doctor Monitor as follows (Example for Apex deployment):
+
+.. code-block:: bash
+
+    git clone https://gerrit.opnfv.org/gerrit/doctor -b stable/danube
+    cd doctor/tests
+    INSPECTOR_PORT=12345
+    COMPUTE_HOST='overcloud-novacompute-1.localdomain.com'
+    COMPUTE_IP=192.30.9.5
+    sudo python monitor.py "$COMPUTE_HOST" "$COMPUTE_IP" \
+        "http://127.0.0.1:$INSPECTOR_PORT/events" > monitor.log 2>&1 &