Neutron

Debugging Neutron

Debugging ML2

To debug ML2 and see the messages that are flowing into the ML2 mechanism you can add the following snippet into your neutron.yaml for your environment.

conf:
  plugins:
    ml2_conf:
      ml2:
        # this line just aims to add 'logger' but its
        # replacing so you'll need to pay attention
        # to any changes your environment might have
        # from the default
        mechanism_drivers: "logger,understack,ovn"
  logging:
    loggers:
      # for 'keys' we are attempt to append 'mechanism_logger'
      # but the way YAML are merged you will need to include
      # all other items in the list here as well.
      keys:
        - ...
        - mechanism_logger
    logger_mechanism_logger:
      level: DEBUG
      handlers: stdout
      qualname: mechanism_logger

Once you deploy this the neutron-server pod will now log everything that the ML2 drivers receive. The log line will have called with network settings in it. That message will be prefixed with the ML2 method name like create_network_postcommit.