[Openstack-operators] Neutron in one cell, Nova network in another

Russell Bryant rbryant at redhat.com
Mon Dec 9 17:30:45 UTC 2013

On 12/07/2013 11:45 AM, Tim Bell wrote:
> Anyone with experience running mixed network models between cells ?
> I wonder if it is possible as a way of gradually migrating to Neutron.

I may need to look closer but this strikes me as something that probably
won't work.  There is tighter coupling betweens cells than I'd really like.

What I've been recommending as a way to gradually migrate is to set up
an independent Nova installation (region) that uses Neutron.

Two Nova deployments:
  Region A (nova-network)
  Region B (Neutron)

 - A and B share all other services (Glance, Keystone, Cinder, etc).

 - Start new instances in region B

 - For instances that need to be migrated, snapshot them into Glance
from region A, and then boot them again in region B.

The downside of course is that you have 2 separate API endpoints for the
compute API for the time of the migration.  It's something that we are
at least confident will work.

Russell Bryant

More information about the OpenStack-operators mailing list