Open Stack

I'm not seeing a path to migrate 1,000s of production VMs from nova network to Neutron.

Can someone describe how this can be done without downtime for the VMs ?

Can we build an approach for the cases below in a single OpenStack production cloud:

1. Existing VMs to carry on running without downtime (and no new features)
2. Existing VMs to choose a window for reconfiguration for Neutron (to get the new function)
3. New VMs to take advantage of Neutron features such as LBaaS
- 
Tim

> -----Original Message-----
> From: Russell Bryant [mailto:rbryant at redhat.com]
> Sent: 29 January 2014 19:04
> To: Daniel P. Berrange
> Cc: OpenStack Development Mailing List (not for usage questions)
> Subject: Re: [openstack-dev] [Nova][Neutron] nova-network in Icehouse and beyond
> 
> On 01/29/2014 12:45 PM, Daniel P. Berrange wrote:
> > I was thinking of an upgrade path more akin to what users got when we
> > removed the nova volume driver, in favour of cinder.
> >
> >   https://wiki.openstack.org/wiki/MigrateToCinder
> >
> > ie no guest visible downtime / interuption of service, nor running of
> > multiple Nova instances in parallel.
> 
> Yeah, I'd love to see something like that.  I would really like to see more effort in this area.  I honestly haven't been thinking about it
> much in a while personally, because the rest of the "make it work" gaps have still been a work in progress.
> 
> There's a bit of a bigger set of questions here, too ...
> 
> Should nova-network *ever* go away?  Or will there always just be a choice between the basic/legacy nova-network option, and the
> new fancy SDN-enabling Neutron option?  Is the Neutron team's time better spent on OpenDaylight integration than the existing
> open source plugins?
> 
> Depending on the answers to those questions, the non-visible no-downtime migration path may be a less important issue.
> 
> --
> Russell Bryant
> 
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