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[Ihar Hrachyshka <1451669@xxxxxxxxxxxxxxxxxx>]

I think the general take of Neutron team is that we don't pick and
choose preferred drivers to enable. We don't do it for core_plugin or
ml2 drivers, we should not do it for advanced services either.
Deployment tools are free to make a choice.

** Changed in: neutron
       Status: In Progress => Opinion

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https://bugs.launchpad.net/bugs/1451669

Title:
  [network] Neutron advance services should support service_plugins and
  service_provider auto configuration

Status in neutron:
  Opinion

Bug description:
  When we enable Neutron advance services(LBaaS, VPNaaS, FWaaS)
  we need to change enablement section to be true or 'True'. And beside this, we also need to configure the service_provider and service_plugin, or there will be problems when missing the service_provider and service_plugin.

  When we hard code to configure the service_provider and service_plugin
  for advance services in attribute, there will be problems too.

  Neutron advance services should auto configuration the
  service_provider and service_plugin, when the enablement section is
  true or 'True'

  example:
  =================================================================
  when enbale LBaaS, we need change below in our environment(VPNaaS, FWaaS is the same):

  1, we should configure this: override enabled to True
  "lbaas": {
            "enabled": "True",
          },
  2, Then add "neutron_vpnaas.services.vpn.plugin.VPNDriverPlugin" in service_plugins
  "service_plugins": [
            "neutron.services.l3_router.l3_router_plugin.L3RouterPlugin",
            "neutron_vpnaas.services.vpn.plugin.VPNDriverPlugin"
          ],
  3, Last add the service provider 
  "service_provider": [ "LOADBALANCER:Haproxy:neutron_lbaas.services.loadbalancer.drivers.haproxy.plugin_driver.HaproxyOnHostPluginDriver:default"
          ],

  disadvantage: customers should always remember to configuration the
  service_plugins and service_provider when enabling advance services,
  and remove the configuration when disabling the service. Or there will
  be errors in Neutron.

  To resolve the inconvenience, we take these changes:
  1, add default values of the plugin and provider in attribute, then we can override them when it need to change.
  2, change the code of cookbook-openstack-network/recipe/default and cookbook-openstack-network/templates/default/neutron.conf.erb to override the service_plugins and service_provider automatically.

  with above change, users will not have to configure the
  service_provider and service_plugins when he want to enable advance
  services, just change the enabled section. our code will handle the
  override for users

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