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Thank you Matt, the background information is important. Seems all the
peoples don't know how the add-fixed-ip API works,
and there is no exact use case about it. Now neutron port-update API also
support to set multiple fixed ip for a port, and
the fixed-ip updating will sync to nova side automatically (I had verified
it in my latest devstack). Updating fixed-ip for
specified port is easier to understand for me in multiple nics case than
nova add-fixed-ip API.

So if others known the orignal API design or had used nova add/remove
fixed-ip API and would like to show your use cases,
it's nice for us to understand how the API works and when we should use it,
we can update the api-ref and add exact usage,
avoid users' confusion about it. Feel free to reply something, thank you.

2017-03-27 23:36 GMT+08:00 Matt Riedemann <mriedemos at gmail.com>:

> On 3/27/2017 7:23 AM, Rui Chen wrote:
>
>> Hi:
>>
>>     A question about nova AddFixedIp API, nova api-ref[1] describe the
>> API as "Adds a fixed IP address to a server instance, which associates
>> that address with the server.", the argument of API is network id, so if
>> there are two or more subnets in a network, which one is lucky to
>> associate ip address to the instance? and the API behavior is always
>> consistent? I'm not sure.
>>     The latest code[2] get all of the instance's ports and subnets of
>> the specified network, then loop them, but it return when the first
>> update_port success, so the API behavior depends on the order of subnet
>> and port list that return by neutron API. I have no idea about what
>> scenario we should use the API in, and the original design, anyone know
>> that?
>>
>> [1]: https://developer.openstack.org/api-ref/compute/#add-associa
>> te-fixed-ip-addfixedip-action
>> [2]: https://github.com/openstack/nova/blob/master/nova/network/n
>> eutronv2/api.py#L1366
>>
>>
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>>
> I wondered about this API implementation myself awhile ago, see this bug
> report for details:
>
> https://bugs.launchpad.net/nova/+bug/1430512
>
> There was a related change for this from garyk:
>
> https://review.openstack.org/#/c/163864/
>
> But that was abandoned.
>
> I'm honestly not really sure what the direction is here. From what I
> remember when I reported that bug, this was basically a feature-parity
> implementation in the compute API for the multinic API with nova-network.
> However, I'm not sure it's very usable. There is a Tempest test for this
> API, but I think all it does is attach an interface and make sure that does
> not blow up, it does not try to use the interface to ssh into the guest,
> for example.
>
> --
>
> Thanks,
>
> Matt
>
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