[openstack-dev] [Nova][Neutron] Linuxbridge as the default in DevStack [was: Status of the nova-network to Neutron migration work]

Kyle Mestery mestery at mestery.com
Fri Apr 10 18:10:06 UTC 2015

On Fri, Apr 10, 2015 at 1:03 PM, Sean M. Collins <sean at coreitpro.com> wrote:

> We already tried to make Neutron the default with OVS - and the results
> were not good[1].
> Operators who are currently not using Neutron have said that they do
> not want to learn both Neutron and also Open vSwitch at the same time.
> This was documented at the operator's summit. We clearly have a
> stumbling block - Open vSwitch.
> https://etherpad.openstack.org/p/PHL-ops-nova-feedback
> https://etherpad.openstack.org/p/PHL-ops-OVS
> Based on discussions we had at the QA sprint, the idea is to start with
> a very simple Neutron configuration in DevStack, so that we can remove
> nova-network as the default. The argument is that the people
> who are still using nova-network are comfortable with Linux Bridge, and
> that having Linux Bridge as the default Neutron agent will serve as
> a "bridge" (no pun intended) into the Neutron world.
> There will be *clear* documentation that this is a very simplistic
> model, and it will be made obvious that for more advanced scenarios you
> will need to configure your local.conf to use the Open vSwitch agent.
> I've spoken with Sean Dague about testing Linux Bridge and
> the idea is that we should have test coverage of both OVS and Linux
> Bridge, and that currently there is a gap with Linux Bridge. I think
> that it's OK if we override the default at the gate to run OVS, since
> that has the most test coverage and will cause the least disruption.
> There will be jobs created, that will test Linux Bridge similar to how
> Open vSwitch is tested at the gate today.
> As a DevStack user, I would like to see Neutron as the default. After
> making Neutron the default, the changes needed for the local.conf file
> for me to run my mechanism driver of choice is significantly smaller
> than the changes needed today for my local.conf/localrc to
> disable Nova-Network, enable Neutron, and run my mechanism driver of
> choice.
> If Linux Bridge being the default is the way to make the above happen,
> so be it.
> ++, well said Sean. I support what's being done here.

> [1]: https://review.openstack.org/#/c/153208/
> --
> Sean M. Collins
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