From 495965d0336d42fc36494c81fd15cee2f34c96e9 Mon Sep 17 00:00:00 2001
From: Tomi Juvonen <tomi.juvonen@nokia.com>
Date: Wed, 8 Aug 2018 14:27:16 +0300
Subject: Update and add test case

Fault management test case update
Adding maintenance test csae

Change-Id: I4ba1e445aa9f801c4e539257fff538253675537d
Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>
---
 .../doctor-scenario-in-functest.rst                | 171 ++++++++++++++++++---
 .../images/Fault-management-design.png             | Bin 0 -> 237110 bytes
 .../images/Maintenance-design.png                  | Bin 0 -> 316640 bytes
 .../images/Maintenance-workflow.png                | Bin 0 -> 81286 bytes
 .../functest_scenario/images/figure-p1.png         | Bin 60756 -> 0 bytes
 5 files changed, 149 insertions(+), 22 deletions(-)
 create mode 100644 docs/development/overview/functest_scenario/images/Fault-management-design.png
 create mode 100644 docs/development/overview/functest_scenario/images/Maintenance-design.png
 create mode 100644 docs/development/overview/functest_scenario/images/Maintenance-workflow.png
 delete mode 100755 docs/development/overview/functest_scenario/images/figure-p1.png

diff --git a/docs/development/overview/functest_scenario/doctor-scenario-in-functest.rst b/docs/development/overview/functest_scenario/doctor-scenario-in-functest.rst
index b3d73d5c..9f92b5bf 100644
--- a/docs/development/overview/functest_scenario/doctor-scenario-in-functest.rst
+++ b/docs/development/overview/functest_scenario/doctor-scenario-in-functest.rst
@@ -6,7 +6,7 @@
 Platform overview
 """""""""""""""""
 
-Doctor platform provides these features in `Danube Release <https://wiki.opnfv.org/display/SWREL/Danube>`_:
+Doctor platform provides these features since `Danube Release <https://wiki.opnfv.org/display/SWREL/Danube>`_:
 
 * Immediate Notification
 * Consistent resource state awareness for compute host down
@@ -15,6 +15,8 @@ Doctor platform provides these features in `Danube Release <https://wiki.opnfv.o
 These features enable high availability of Network Services on top of
 the virtualized infrastructure. Immediate notification allows VNF managers
 (VNFM) to process recovery actions promptly once a failure has occurred.
+Same framework can also be utilized to have VNFM awareness about
+infrastructure maintenance.
 
 Consistency of resource state is necessary to execute recovery actions
 properly in the VIM.
@@ -26,18 +28,20 @@ fault.
 The Doctor platform consists of the following components:
 
 * OpenStack Compute (Nova)
+* OpenStack Networking (Neutron)
 * OpenStack Telemetry (Ceilometer)
-* OpenStack Alarming (Aodh)
-* Doctor Inspector
-* Doctor Monitor
+* OpenStack Alarming (AODH)
+* Doctor Sample Inspector, OpenStack Congress or OpenStack Vitrage
+* Doctor Sample Monitor or any monitor supported by Congress or Vitrage
 
 .. note::
-    Doctor Inspector and Monitor are sample implementations for reference.
+    Doctor Sample Monitor is used in Doctor testing. However in real
+    implementation like Vitrage, there are several other monitors supported.
 
 You can see an overview of the Doctor platform and how components interact in
 :numref:`figure-p1`.
 
-.. figure:: ./images/figure-p1.png
+.. figure:: ./images/Fault-management-design.png
     :name: figure-p1
     :width: 100%
 
@@ -47,8 +51,19 @@ Detailed information on the Doctor architecture can be found in the Doctor
 requirements documentation:
 http://artifacts.opnfv.org/doctor/docs/requirements/05-implementation.html
 
-Use case
-""""""""
+Running test cases
+""""""""""""""""""
+
+Functest will call the "doctor_tests/main.py" in Doctor to run the test job.
+Doctor testing can also be triggered by tox on OPNFV installer jumphost. Tox
+is normally used for functional, module and coding style testing in Python
+project.
+
+Currently, 'Apex', 'Daisy', 'Fuel' and 'local' installer are supported.
+
+
+Fault management use case
+"""""""""""""""""""""""""
 
 * A consumer of the NFVI wants to receive immediate notifications about faults
   in the NFVI affecting the proper functioning of the virtual resources.
@@ -67,7 +82,8 @@ configuration.
 Detailed workflow information is as follows:
 
 * Consumer(VNFM): (step 0) creates resources (network, server/instance) and an
-  event alarm on state down notification of that server/instance
+  event alarm on state down notification of that server/instance or Neutron
+  port.
 
 * Monitor: (step 1) periodically checks nodes, such as ping from/to each
   dplane nic to/from gw of node, (step 2) once it fails to send out event
@@ -75,29 +91,26 @@ Detailed workflow information is as follows:
 
 * Inspector: when it receives an event, it will (step 3) mark the host down
   ("mark-host-down"), (step 4) map the PM to VM, and change the VM status to
-  down
+  down. In network failure case, also Neutron port is changed to down.
 
-* Controller: (step 5) sends out instance update event to Ceilometer
+* Controller: (step 5) sends out instance update event to Ceilometer. In network
+  failure case, also Neutron port is changed to down and corresponding event is
+  sent to Ceilometer.
 
-* Notifier: (step 6) Ceilometer transforms and passes the event to Aodh,
-  (step 7) Aodh will evaluate event with the registered alarm definitions,
+* Notifier: (step 6) Ceilometer transforms and passes the events to AODH,
+  (step 7) AODH will evaluate events with the registered alarm definitions,
   then (step 8) it will fire the alarm to the "consumer" who owns the
   instance
 
 * Consumer(VNFM): (step 9) receives the event and (step 10) recreates a new
   instance
 
-Test case
-"""""""""
-
-Functest will call the "run.sh" script in Doctor to run the test job.
+Fault management test case
+""""""""""""""""""""""""""
 
-Currently, only 'Apex' and 'local' installer are supported. The test also
-can run successfully in 'fuel' installer with the modification of some
-configurations of OpenStack in the script. But still need 'fuel' installer
-to support these configurations.
+Functest will call the 'doctor-test' command in Doctor to run the test job.
 
-The "run.sh" script will execute the following steps.
+The following steps are executed:
 
 Firstly, get the installer ip according to the installer type. Then ssh to
 the installer node to get the private key for accessing to the cloud. As
@@ -124,3 +137,117 @@ is calculated.
 
 According to the Doctor requirements, the Doctor test is successful if the
 notification time is below 1 second.
+
+Maintenance use case
+""""""""""""""""""""
+
+* A consumer of the NFVI wants to interact with NFVI maintenance, upgrade,
+  scaling and to have graceful retirement. Receiving notifications over these
+  NFVI events and responding to those within given time window, consumer can
+  guarantee zero downtime to his service.
+
+The maintenance use case adds the Doctor platform an `admin tool` and an
+`app manager` component. Overview of maintenance components can be seen in
+:numref:`figure-p2`.
+
+.. figure:: ./images/Maintenance-design.png
+    :name: figure-p2
+    :width: 100%
+
+    Doctor platform components in maintenance use case
+
+In maintenance use case, `app manager` (VNFM) will subscribe to maintenance
+notifications triggered by project specific alarms through AODH. This is the way
+it gets to know different NFVI maintenance, upgrade and scaling operations that
+effect to its instances. The `app manager` can do actions depicted in `green
+color` or tell `admin tool` to do admin actions depicted in `orange color`
+
+Any infrastructure component like `Inspector` can subscribe to maintenance
+notifications triggered by host specific alarms through AODH. Subscribing to the
+notifications needs admin privileges and can tell when a host is out of use as
+in maintenance and when it is taken back to production.
+
+Maintenance test case
+"""""""""""""""""""""
+
+Maintenance test case is currently running in our Apex CI and executed by tox.
+This is because the special limitation mentioned below and also the fact we
+currently have only sample implementation as a proof of concept. Environmental
+variable TEST_CASE='maintenance' needs to be used when executing
+"doctor_tests/main.py". Test case workflow can be seen in :numref:`figure-p3`.
+
+.. figure:: ./images/Maintenance-workflow.png
+    :name: figure-p3
+    :width: 100%
+
+    Maintenance test case workflow
+
+In test case all compute capacity will be consumed with project (VNF) instances.
+For redundant services on instances and an empty compute needed for maintenance,
+test case will need at least 3 compute nodes in system. There will be 2
+instances on each compute, so minimum number of VCPUs is also 2. Depending on
+how many compute nodes there is application will always have 2 redundant
+instances (ACT-STDBY) on different compute nodes and rest of the compute
+capacity will be filled with non-redundant instances.
+
+For each project specific maintenance message there is a time window for
+`app manager` to make any needed action. This will guarantee zero
+down time for his service. All replies back are done by calling `admin tool` API
+given in the message.
+
+The following steps are executed:
+
+Infrastructure admin will call `admin tool` API to trigger maintenance for
+compute hosts having instances belonging to a VNF.
+
+Project specific `MAINTENANCE` notification is triggered to tell `app manager`
+that his instances are going to hit by infrastructure maintenance at a specific
+point in time. `app manager` will call `admin tool` API to answer back
+`ACK_MAINTENANCE`.
+
+When the time comes to start the actual maintenance workflow in `admin tool`,
+a `DOWN_SCALE` notification is triggered as there is no empty compute node for
+maintenance (or compute upgrade). Project receives corresponding alarm and scales
+down instances and call `admin tool` API to answer back `ACK_DOWN_SCALE`.
+
+As it might happen instances are not scaled down (removed) from a single
+compute node, `admin tool` might need to figure out what compute node should be
+made empty first and send `PREPARE_MAINTENANCE` to project telling which instance
+needs to be migrated to have the needed empty compute. `app manager` makes sure
+he is ready to migrate instance and call `admin tool` API to answer back
+`ACK_PREPARE_MAINTENANCE`. `admin tool` will make the migration and answer
+`ADMIN_ACTION_DONE`, so `app manager` knows instance can be again used.
+
+:numref:`figure-p3` has next a light blue section of actions to be done for each
+compute. However as we now have one empty compute, we will maintain/upgrade that
+first. So on first round, we can straight put compute in maintenance and send
+admin level host specific `IN_MAINTENANCE` message. This is caught by `Inspector`
+to know host is down for maintenance. `Inspector` can now disable any automatic
+fault management actions for the host as it can be down for a purpose. After
+`admin tool` has completed maintenance/upgrade `MAINTENANCE_COMPLETE` message
+is sent to tell host is back in production.
+
+Next rounds we always have instances on compute, so we need to have
+`PLANNED_MAINTANANCE` message to tell that those instances are now going to hit
+by maintenance. When `app manager` now receives this message, he knows instances
+to be moved away from compute will now move to already maintained/upgraded host.
+In test case no upgrade is done on application side to upgrade instances
+according to new infrastructure capabilities, but this could be done here as
+this information is also passed in the message. This might be just upgrading
+some RPMs, but also totally re-instantiating instance with a new flavor. Now if
+application runs an active side of a redundant instance on this compute,
+a switch over will be done. After `app manager` is ready he will call
+`admin tool` API to answer back `ACK_PLANNED_MAINTENANCE`. In test case the
+answer is `migrate`, so `admin tool` will migrate instances and reply
+`ADMIN_ACTION_DONE` and then `app manager` knows instances can be again used.
+Then we are ready to make the actual maintenance as previously trough
+`IN_MAINTENANCE` and `MAINTENANCE_COMPLETE` steps.
+
+After all computes are maintained, `admin tool` can send `MAINTENANCE_COMPLETE`
+to tell maintenance/upgrade is now complete. For `app manager` this means he
+can scale back to full capacity.
+
+This is the current sample implementation and test case. Real life
+implementation is started in OpenStack Fenix project and there we should
+eventually address requirements more deeply and update the test case with Fenix
+implementation.
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