[Openstack] Which API to use for floating IPs?

Everett Toews everett.toews at RACKSPACE.COM
Fri Feb 20 13:56:00 UTC 2015

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). 


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