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[neutron] Is a provider of the "router" extension required also to provide the "extraroute" extension?


Hi Neil,

Neutron extensions are to be treated as optional (one by one) from an
API user point of view. Many reference implementations implement
multiple extensions at once in the same plugin and by that may create
the (false) expectation the extensions always come together. But as
soon as another cloud loads different plugins this expectation is
going to break.

For example this is the l3 service plugin's extension list:

https://github.com/openstack/neutron/blob/8a584171cd505593c69f9149aa58c6aa9b9e7ac3/neutron/services/l3_router/l3_router_plugin.py#L95

But another plugin loaded in another cloud may choose to implement a
different set of extensions. So I'd argue the client should be more
lenient here and accept when the 'routes' attribute is not there.

It's another interesting question what may changed in the Calico CI,
I'd probably start with this line in the log you linked:

2019-09-26 18:32:52.772 | ++
/opt/stack/new/networking-calico/devstack/plugin.sh:source:98 :
inidelete /etc/neutron/neutron.conf DEFAULT service_plugins

That tells Neutron not to load any service plugins - including the l3
service plugin.

Hope that helps,
Bence