openstack team mailing list archive

[Gary Kotton <gkotton@xxxxxxxxxx>]

On 10/26/2012 03:56 PM, Gurjar, Unmesh wrote:
> Hi,
>
> I can think of two alternative  solutions for maintaining uniqueness:
>
> 1.DB look up: After generating a new MAC address, checking uniqueness 
> by doing  a DB look up.

The Quantum code ensure that the MAC address generated is unqiue. This 
is done by checking against MAC addresses already allocated.

> 2.Having a 'unique' constraint on the 'mac_address' column and handle 
> the DB IntegrityError and retry generating a new MAC address.
>
> I also think, initializing the 'random.seed' in start-up process of 
> Quantum server (with a different value -- configurable one; on each 
> server) could help in reducing conflicts.
>
> I think either of the above solutions could be used for fixing LP bug 
> #1050924.
>
> Thanks & Regards,
>
> *Unmesh Gurjar*| Lead Engineer | NTT DATA Global Technology Services 
> Private Limited | *w.* +91.20.6604.1500 x 379 | *m.* +91.982.324.7631 
> | unmesh.gurjar@xxxxxxxxxxx <mailto:unmesh.gurjar@xxxxxxxxxxx> | Learn 
> more at nttdata.com/americas**
>
> *From:*openstack-bounces+unmesh.gurjar=nttdata.com@xxxxxxxxxxxxxxxxxxx 
> [mailto:openstack-bounces+unmesh.gurjar=nttdata.com@xxxxxxxxxxxxxxxxxxx] 
> *On Behalf Of *Neelakantam Gaddam
> *Sent:* Friday, October 26, 2012 11:37 AM
> *To:* mthode@xxxxxxxxxx
> *Cc:* openstack@xxxxxxxxxxxxxxxxxxx
> *Subject:* Re: [Openstack] MAC address uniqueness in folsom
>
> Hi,
>
> We want unique MAC addresses in our environment only but across 
> multiple tenants.
>
> Thanks for quick reply.
>
> ---
> Neelakantam
>
> On Fri, Oct 26, 2012 at 9:38 AM, Matthew Thode <mthode@xxxxxxxxxx 
> <mailto:mthode@xxxxxxxxxx>> wrote:
>
> On 10/25/2012 11:02 PM, Neelakantam Gaddam wrote:
> > Hi All,
> >
> > Does the MAC address generated in quantum is unique across tenants in
> > folsom?
> > I am developing an application that requires unique MAC address. If not
> > unique, is there any way to make MAC address unique?
> >
> > Please help me. Thanks in advance.
> >
> >
> >
> >
>
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> Do you need it to be globally unique (amongst all macs on earth) or
> simply unique in your environment?
>
> --
> -- Matthew Thode
>
>
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>
>
> --
> Thanks & Regards
> Neelakantam Gaddam
>
>
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