Open Stack

During the installation guide renovation process, we originally intended to
support one path (neutron with Open vSwitch and tenant/external networks)
given the imminent deprecation of nova-network. However, the latter didn't
happen, so we kept the nova-network path and agreed to limit future
development efforts to the neutron path.

The two different paths continue to cause confusion, particularly with the
basic environment (host and network) requirements. Since I began working
with OpenStack around the Havana release, neutron seems to generate the
most frustration, particularly due to general lack of current, concise
documentation and inexperience with Linux networking. Along came the
networking guide that illustrates a variety of different deployment
scenarios including the simple to understand and deploy provider networks
with Linux bridge scenario that closely mimics nova-network. This scenario
isn't new... just not widely known or understood until the documentation
appeared for it.

I'm not privy to all of the discussions, but long story short, a variety of
people think this scenario presents a viable alternative to nova-network
for new installations and insist that we include it in the installation
guide. However, given the issues with two paths, three will only increase
confusion. Trying to retain two paths, we can't replace neutron with Open
vSwitch and tenant/external networks with provider networks because the
latter doesn't support self-service networking, a significant feature of
cloud computing. So, I agree with replacing nova-network with the similar
provider networks with Linux bridge scenario. It also makes sense to
replace the existing neutron with Open vSwitch configuration with Linux
bridge to flatten the learning curve with self-service networking and to
provide better consistency between the two paths.

On Wed, Jul 15, 2015 at 6:31 AM, Anne Gentle <annegentle at justwriteclick.com>
wrote:

>
>
> On Tue, Jul 14, 2015 at 10:56 PM, Tom Fifield <tom at openstack.org> wrote:
>
>> Hi,
>>
>> We never did get a clear answer as to what the thinking is around
>> dropping this option our users want from the install guide? As
>> previously mentioned, it's damn simple to keep in and continues to work
>> well, so difficult to understand.
>>
>> Perhaps the position has changed to one of keeping this useful option?
>>
>>
>>
> From a Technical Committee standpoint, we thought a third option of the
> provider networks with Linux Bridge was a good way forward. So three
> networking options in the install guide:
>
> Legacy nova-network
> Provider networks with Linux Bridge
> Provider networks with OVS
>
> Then, point to the Networking Guide for additional configurations.
>
> What does the team think?
> Anne
>
>
>
>> Regards,
>>
>>
>> Tom
>>
>> On 02/07/15 23:32, Tom Fifield wrote:
>> > Hi Mark,
>> >
>> > Welcome to a random discussion on the docs list! It seems like Matt K
>> > and yourself might have had a chat at the neutron midcycle regarding the
>> > install guide?
>> >
>> > Regards,
>> >
>> >
>> > Tom
>> >
>> > On 02/07/15 23:27, Matt Kassawara wrote:
>> >> Ask Mark McClain.
>> >>
>> >> On Thu, Jul 2, 2015 at 9:04 AM, Tom Fifield <tom at openstack.org
>> >> <mailto:tom at openstack.org>> wrote:
>> >>
>> >>     On 02/07/15 22:50, Matt Kassawara wrote:
>> >>     > With provider networks using the Linux bridge agent, neutron
>> reaches the
>> >>     > simplicity of nova-network. Also, the installation guide will
>> continue
>> >>     > to use the two-host architecture.
>> >>
>> >>     Close, but not quite :) Anyway, as noted - the question is why
>> something
>> >>     our users want is being dropped, when it's damn simple to keep in
>> and
>> >>     continues to work well?
>> >>
>> >>     > On Tue, Jun 30, 2015 at 11:03 PM, Tom Fifield <tom at openstack.org
>> <mailto:tom at openstack.org>
>> >>     > <mailto:tom at openstack.org <mailto:tom at openstack.org>>> wrote:
>> >>     >
>> >>     >     On 30/06/15 21:37, Karin Levenstein wrote:
>> >>     >     > Guide architecture change for Liberty
>> >>     >     > =====
>> >>     >     > At the Neutron meetup that Matt attended last week, there
>> was discussion
>> >>     >     > about dropping nova-net and standardizing Neutron on Linux
>> bridge rather
>> >>     >     > than OVS.
>> >>     >     > The plan that came out of the meeting: changing networking
>> architecture
>> >>     >     > from nova-net/Neutron OVS to: provider networking (connect
>> VMs to
>> >>     >     > network) with Linux Bridge; standard tenant network w/
>> Linux bridge and
>> >>     >     > not OVS. All distros will have to support this.
>> >>     >     > This will not be addressed in the install guide until the
>> RST conversion
>> >>     >     > is complete.
>> >>     >     > ACTION: Matt to add this information to install guide spec
>> so that it
>> >>     >     > can be captured in the planning for Liberty.
>> >>     >
>> >>     >     Is there further discussion available around dropping a
>> >>     >     simple-to-implement, commonly used and upstream-supported
>> network
>> >>     >     deployment model (nova-network)?
>> >>     >
>> >>     >
>> >>     >
>> >>     >     Regards,
>> >>     >
>> >>     >
>> >>     >     Tom
>> >>     >
>> >>     >
>> >>     >     _______________________________________________
>> >>     >     OpenStack-docs mailing list
>> >>     >     OpenStack-docs at lists.openstack.org
>> >>     <mailto:OpenStack-docs at lists.openstack.org>
>> >>     >     <mailto:OpenStack-docs at lists.openstack.org
>> >>     <mailto:OpenStack-docs at lists.openstack.org>>
>> >>     >
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-docs
>> >>     >
>> >>     >
>> >>
>> >>
>> >
>> >
>> > _______________________________________________
>> > OpenStack-docs mailing list
>> > OpenStack-docs at lists.openstack.org
>> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-docs
>> >
>>
>>
>> _______________________________________________
>> OpenStack-docs mailing list
>> OpenStack-docs at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-docs
>>
>
>
>
> --
> Anne Gentle
> Rackspace
> Principal Engineer
> www.justwriteclick.com
>
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