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

Andrew Bogott abogott at wikimedia.org
Mon Dec 22 08:46:48 UTC 2014

On 12/22/14 2:08 PM, Kevin Benton wrote:
> 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?

Mmmmaybe?  Floating IP support in nova-network is pretty great 
(allocation, assignment, release, etc.) and allows us shuffle around a 
small number of public IPs amongst a much larger number of instances.  
Your suggestion doesn't address that, does it?  Short of my implementing 
a bunch of custom stuff on my own?


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