[Openstack] Which API to use for floating IPs?

Joe Topjian joe at topjian.net
Fri Feb 20 15:16:28 UTC 2015

Thanks, Everett.

I agree about "it depends" -- I was just hoping to get better clarification
on what factors contribute to that, such as an example of a non-trivial
network setup.

The os-floating-ips extension seems a bit "magic" in that it will
automatically do a lot of the leg work that the application developer would
normally have to do with the Neutron API. Whoever did that work must have
had some idea of what the acceptable scenarios were.

My curiosity is getting the best of me and I might end up searching for
some old specs or directly in the nova code.  :)

On Fri, Feb 20, 2015 at 6:56 AM, Everett Toews <everett.toews at rackspace.com>

> On Feb 16, 2015, at 1:14 PM, Joe Topjian <joe at topjian.net> wrote:
> > Hello,
> >
> > When using the APIs directly to manage instances, which API is
> preferable for associating and disassociating Floating IPs?
> >
> > Nova has the "os-floating-ips" extension which works for nova-network
> based environments and, as far as I can tell, Neutron-based environments.
> All that is required is a Floating IP and an instance ID.
> >
> > It's also possible to associate a Floating IP to an instance by using
> the Neutron API as well, but it seems more complex. Unless I'm mistaken,
> with the Neutron API, the UUID of the Floating IP and the UUID of the Port
> of the instance is required. If you also want to make sure that the port is
> able to support that Floating IP, you must query further.
> >
> > Given the ability to skip a good number of steps, is there a case where
> using os-floating-ips to associate and disassociate Floating IPs and
> instances on Neutron networks is not recommended?
> Isn’t the answer (as usual) it depends?
> If you’ve got users who need a non-trivial networking setup and need to
> associate a Floating IP with a Port then direct them to use the Neutron
> APIs (or SDKs/CLIs). I can’t think of any other use cases than associate a
> Floating IP with a Port off the top of my head.
> If you’ve got users who only need the most basic networking setup possible
> then direct them to use the Nova’s os-floating-ips API (or SDK/CLI).
> Everett
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