openstack team mailing list archive

[Erik Carlin <erik.carlin@xxxxxxxxxxxxx>]

Eldar -

The OpenStack API already supports sharing IPs between instances (although
this may be an extension?).  What exact behavior are you after?  More
important than the way in which we expose via the API is how it's
implemented.  It's important to note that this is extremely network
topology dependent.  Sharing IPs today requires L2 adjacency so other VMs
can GARP for the IP.  L2 doesn't work at scale so you need another
mechanism.  I'm pretty sure the way AWS does it is to have a separate pool
of IPs and inject /32 routes higher up that route towards the appropriate
VM IP.  What are your thoughts around how this would be implemented?

Multiple people are working towards an independent Network as a Service
external to nova so it may make sense to plug this requirement in there.

Erik

On 4/11/11 8:31 AM, "Eldar Nugaev" <enugaev@xxxxxxxxxxxxxxxx> wrote:

>Hello everyone,
>
>We going to add possibility to assigning floating IP addresses in
>OpenStack API.
>Our goal reproduce AWS behavior when creating instance automatically
>assigns any free floating IP or add methods to OpenStack API for
>allocation and association API addresses.
>
>At this time we see three way:
>
>1. FLAG --auto_assign_floating_ip (default=False)
>2. Optional parameter "auto_assign_floating_ip" in existing "create"
>method
>3. OpenStack API add floating_ip - allocate_floating_ip,
>associate_floating_ip
>
>What way is more suitable at this time?
>
>-- 
>Eldar
>Skype: eldar.nugaev
>
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