Open Stack

Hi OpenStackers,

In tacker project, we need to setup QOS plugin in devstack CI job (tacker-functional-devstack-multinode-python3) to run our functional tests.
I have checked what config options are needed to enable QOS in neutron and updated .zuul.yaml accordingly as you can see in patch [1] PS 18.

Mainly, I have enabled following environment variables in .zuul.yaml:-
Q_SERVICE_PLUGIN_CLASSES: router,neutron.services.metering.metering_plugin.MeteringPlugin,networking_sfc.services.flowclassifier.plugin.FlowClassifierPlugin,neutron.services.qos.qos_plugin.QoSPlugin,
Q_ML2_PLUGIN_EXT_DRIVERS: port_security,qos
L2_AGENT_EXTENSIONS: qos
NEUTRON_PORT_SECURITY: False

Problem:
Main point is service_plugins config option is configured with qos but the [ml2].extension drivers doesn't include qos.
I hav set qos" in  Q_ML2_PLUGIN_EXT_DRIVERS but still it's not set in the /etc/neutron/plugins/ml2/ml2_conf.ini in Section [ml2].extension_drivers on the controller node and because of this reason the q-svc service is not starting on the controller node.

I have scoured devstack.log to find out where it's overwriting extension_drivers with "port_security" instead of "port_security, qos" but I couldn't find one.

On the controller node, we can see this log statement:-
  2020-04-10 13:07:23.388678 | controller | +   lib/neutron_plugins/ml2:populate_ml2_config:59 :   iniset /etc/neutron/plugins/ml2/ml2_conf.ini ml2 extension_drivers port_security,qos

It's clear from above log, qos is set properly but where exactly it's overwritten with just port_security or qos is removed is not clear to me.

Any pointers where I can debug to solve this problem or how to set QOS correctly?

[1]: https://review.opendev.org/#/c/717530/18

Regards,
tpatil
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