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> From: Jim Rollenhagen [mailto:jim at jimrollenhagen.com]
> On Thu, May 12, 2016 at 06:48:02AM -0400, Sean Dague wrote:
> > Let me make sure I understand the crux of the issue: services may need
> > to create additional custom networking in order for the rest of the
> > resource flow to work correctly. Ironic definitely needs this because
> > it's building up an interesting simulated network here for it's guests
> > to live on.
> >
> > That feels like we need a new pre_create (or early_create) phase that
> > ironic could hook into to do that same network create. I think the only
> > question in my mind is whether neutrons network create here should
> move
> > to early_create as well.
> 
> This would work well, if we moved neutron's net-create to here,
> because...
> 
> > Does ironic's ovs setup need to happen after the neutron create phase
> > here, or does it just need to happen before nova?
> 
> Yes, the network needs to already exist when we do this.
> 
> > Does ironic need to overwrite the $net_id that gets passed to Nova later?
> 
> Nope, it's the same ID. We just get the OVS tap device for that network
> and muck with it a bit. Then we set the shared property of the network:
> 
>     neutron net-update $ironic_net_id --shared true
> 
> FWIW, to get the tap device, we do need to create a port on the network
> (which we later delete), but I don't think that has any effect on what
> you describe above.

As a note, a patch to Grenade has been posted to add an 'early_create' phase:
https://review.openstack.org/315501