neutron/neutron/services/l3_router
Boden R 29f56478d1 remove the neutron.db._resource_extend module
The _resource_extend module is already rehomed into neutron-lib and is
shimmed in neutron. This patch removes the module as no active
consumers are using it.

NeutronLibImpact

Change-Id: I1550075fa5fa2aa2f1a88ee7189d311a1fe78391
2019-01-02 13:02:06 -07:00
..
service_providers Merge "Select service_provider on the basis of service_module" 2018-11-15 12:47:09 +00:00
__init__.py Empty files should not contain copyright or license 2014-10-20 00:50:32 +00:00
l3_router_plugin.py remove the neutron.db._resource_extend module 2019-01-02 13:02:06 -07:00
README Adopt neutron-lib plugin directory 2016-11-23 04:45:33 -07:00

This service plugin implements the L3 routing functionality (resources router
and floatingip) that in earlier releases before Havana was provided by core
plugins (openvswitch, linuxbridge, ... etc).

Core plugins can now choose not to implement L3 routing functionality and
instead delegate that to the L3 routing service plugin.

The required changes to a core plugin are in that case:
- Do not inherit 'l3_db.L3_NAT_db_mixin' (or its descendants like extraroute)
  anymore.
- Remove "router" from 'supported_extension_aliases'.
- Modify any 'self' references to members in L3_NAT_db_mixin to instead use
  'directory.get_plugin(constants.L3)'
  For example,
     self.prevent_l3_port_deletion(...)
  becomes something like
     plugin = directory.get_plugin(constants.L3)
     if plugin:
         plugin.prevent_l3_port_deletion(...)

If the core plugin has relied on the L3Agent the following must also be changed:
- Do not inherit 'l3_rpc_base.L3RpcCallbackMixin' in any '*RpcCallbacks' class.
- Do not be a consumer of the topics.L3PLUGIN topic for RPC.

To use the L3 routing service plugin, add
'neutron.services.l3_router.l3_router_plugin.L3RouterPlugin'
to 'service_plugins' in '/etc/neutron/neutron.conf'.
That is,
service_plugins = neutron.services.l3_router.l3_router_plugin.L3RouterPlugin