[Presented in the OpenStack Liberty Summit, Vancouver, May, 2015] (https://www.openstack.org/summit/vancouver-2015/summit-videos/presentation/don-diagnosing-ovs-in-neutron "DON Presentation at OpenStack Liberty Summit, Vancouver, May 2015").

A lot has changed since Vancouver! Support for multi-node OpenStack installations and complete integrated with Horizon, Liberty release are among the things to look forward to.

Neutron provides Networking-as-a-service in the OpenStack ecosystem. Networking functionalities are provided by plugins that implement well-defined Neutron APIs. Among many, the Open vSwitch plugin (OVS) is possibly the most widely used. Any practical OpenStack installation has complicated networking configuration and verifying it manually is time consuming and error prone. DON, written primarily in Python, and available as a dashboard in OpenStack Horizon, Libery release, is a network analysis and diagnostic system and provides a completely automated service for verifying and diagnosing the networking functionality provided by OVS. This service verifies (or points out deviations) that the user configuration is indeed reflected in the underlying infrastructure and presents the results in an intuitive graphical display.

As an example, given the following Neutron network topology:

DON generates the following view of the networking internals,

does OVS tests and ping tests,

and also allows the user to do ping tracing

The project is in beta status and we are in the process of moving it to stackforge.

DON first collects the output of several commands, parses the output, and creates a JSON database. This database is then used by the analyzer module, the visualizer module, and the test module.

• Django version must be 1.7 or later. However, since OpenStack Horizon uses Django, there is no need to separately install Django.

• The Graphviz dot utility. This is used for drawing the visualization.

0. You must have a devstack setup running on a single VM.
1. Download and source the project specific rc file.
2. Copy the DON source to Horizon directory.(/opt/stack/horizon/)
3. Restart Horizon by executing sudo service apache2 restart

0. You must have Ansible (version 2.0 or later) installed in execution server
1. Clone DON source to execution server
2. Open shell promt and execute the below command from DON directory
3. ansible-playbook don_playbook.yaml -i <inventory file path> --ask-pass

Please look at issues in the github repo. If you have questions, bugs, or feature requests, file an issue or send email to:

• Amit Saha (amisaha+don@cisco.com)