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[Openstack] Multiple floating IPs one instance

In our KVM deployment we've found mapping 2 floating IPs to an instance
(pulled from 2 separate external network floating IP pools) like this is
perfectly possible, with the proviso that with port security enabled on the
Neutron ports static routes must be placed on the instance to ensure that
traffic uses the correct interface, i.e. return traffic that came in on the
private interface associated with one floating IP must go out the same
interface and not another (or it will likely be dropped at the hypervisor).


On 1 May 2018 at 16:06, Paras pradhan <pradhanparas at gmail.com> wrote:

> Look for  nova add-fixed-ip and nova add-floating-ip
> * add a private fixed ip for an instance:  nova add-fixed-ip instance_id
> neutron_network_id
> * On instance : ip address add private_fixed_ip_address/24 dev eth0
> * add fip: nova add-floating-ip --fixed-address private_fixed_ip_address
> instance_id floating_ip_address
> Thanks
> Paras.
> On Fri, Apr 27, 2018 at 1:47 PM, Torin Woltjer <
> torin.woltjer at granddial.com> wrote:
>> Is it possible to run an instance with more than one floating IPs? It is
>> not immediately evident how to do this, or whether it is even possible. I
>> have an instance that I would like to have address on two separate
>> networks, and would like to use floating IPs so that I can have that are
>> capable of living longer than the instance itself.
>> *Torin Woltjer*
>> *Grand Dial Communications - A ZK Tech Inc. Company*
>> *616.776.1066 ext. 2006*
>> * <http://www.granddial.com>www.granddial.com <http://www.granddial.com>*
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Paul Browne
Research Computing Platforms
University Information Services
Roger Needham Building
JJ Thompson Avenue
University of Cambridge
United Kingdom
E-Mail: pfb29 at cam.ac.uk
Tel: 0044-1223-746548
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