[Openstack] Neutron vs. FlatDHCP -- what's the latest?

Kevin Benton blak111 at gmail.com
Mon Dec 22 06:08:04 UTC 2014

Can't you simulate the same topology as the FlatDHCPManager + Floating IPs
with a shared network attached to a router which is then attached to an
external network?

On Sun, Dec 21, 2014 at 7:00 PM, Andrew Bogott <abogott at wikimedia.org>

>  Greetings!
> I'm about to set up a new cloud, so for the second time this year I'm
> facing the question of Neutron vs. nova-network.  In our current setup
> we're using nova.network.manager.FlatDHCPManager with floating IPs.  This
> config has been working fine, and would probably be our first choice for
> the new cloud as well.
> At this point is there any compelling reason for us to switch to Neutron?
> My understanding is that the Neutron flat network model still doesn't
> support anything similar to floating IPs, so if we move to Neutron we'll
> need to switch to a subnet-per-tenant model.  Is that still correct?
> I'm puzzled by the statement that " upgrades without instance downtime
> will be available in the Kilo release"[1] -- surely for such a path to
> exist, Kilo/Neutron would need to support all the same use cases as
> nova-network.  If that's right and Neutron is right on the verge of
> supporting flat-with-floating then we may just cool our jets and wait to
> build the new cloud until Kilo is released.  I have no particular reason
> to prefer Neutron, but I'd like to avoid betting on a horse right before
> it's put down :)
> Thanks!
> -Andrew
> [1]
> http://docs.openstack.org/openstack-ops/content/nova-network-deprecation.html
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Kevin Benton
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