Open Stack

We have had some discussions around how to move forward with the LBaaS
service in OpenStack.  I am trying to summarize the key points below.


Feel free to chime in if I misrepresented anything or if you disagree :-)



For simplicity in the rest of the email and so I can differentiate between
all the LBaaS’s e.g. Neutron LBaaS, etc… I will name the new OpenStack
LBaaS project (that we discussed at the summit): Octavia in the rest of
this email. Note that this doesn’t mean we have agree on this name.



*Goal:*

We all want to create a best in class “operator scale” Octavia LBaaS
service to our customers.

Following requirements need to be considered (these are already listed in
some of the etherpads we have worked on)

·         Provides scalability, failover, config management, and
provisioning.

·         Architecture need to be pluggable so we can offer support for
HAProxy, Nginx, LVS, etc.



*Some disagreements exist around the scope of the new project: *



Some of the participating companies including HP are interested in a best
in class standalone Octavia load-balancer service that is part of OpenStack
and with the “label” OpenStack. http://www.openstack.org/software/

·         The Octavia LBaaS project needs to work well with OpenStack or
this effort is not worth doing. HP believes that this should be the primary
focus.

·         In this case the end goal would be to have a clean interface
between Neutron and the standalone Octavia LBaaS project and have the
Octavia LBaaS project become an incubated and eventual graduated OpenStack
project.

o   We would start out as a driver to Neutron.

o   This project would deprecate Neutron LBaaS long term since part of the
Neutron LBaaS would move over to the Octavia LBaaS project.

o   This project would continue to support both vendor drivers and new
software drivers e.g. ha-proxy, etc.

·         Dougwig created the following diagram which gives a good overview
of my thinking: http://imgur.com/cJ63ts3 where Octavia is represented by
“New Driver Interface” and down. The whole picture shows how we could move
from the old to the new driver interface



Other participating companies want to create a best in class standalone
load-balancer service outside of OpenStack and only create a driver to
integrate with Openstack Neutron LBaaS.

·         The Octavia LBaaS driver would be part of Neutron LBaaS tree
whereas the Octavia LBaaS implementation would reside outside OpenStack
e.g. Stackforge or github, etc.



The main issue/confusion is that some of us (HP LBaaS team) do not think of
projects in StackForge as OpenStack branded. HP developed  Libra LBaaS
which is open sourced in StackForge and when we tried to get it into
OpenStack we met resistance.



One person suggested the idea of designing the Octavia LBaaS service
totally independent of Neutron or any other service that calls. This might
makes sense for a general LBaaS service but given that we are in the
context of OpenStack this to me just makes the whole testing and developing
a nightmare to maintain and not necessary. Again IMHO we are developing and
delivering Octavia in the context of OpenStack so the Octavia LBaaS  should
just be super good at dealing with the OpenStack env. The architecture can
still be designed to be pluggable but my experiences tell me that we will
have to make decision and trade-offs and at that point we need to remember
that we are doing this in the context of OpenStack and not in the general
context.



*How do we think we can do it?*



We have some agreement around the following approach:



·         To start developing the driver/Octavia implementation in
StackForge which should allow us to increase the velocity of our
development using the OpenStack CI/CD tooling (incl. jenkins) to ensure
that we test any change. This will allow us to ensure that changes to
Neutron do not break our driver/implementation as well as the other way
around.

o   We would use Gerrit for blueprints so we have documented reviews and
comments archived somewhere.

o   Contribute patches regularly into the Neutron LBaaS tree:

§  Kyle has volunteered himself and one more core team members to review
and help move a larger patch into Neutron tree when needed. It was also
suggested that we could do milestones of smaller patches to be merged into
Neutron LbaaS. The latter approach was preferred by most participants.



The main goal behind this approach is to make sure we increase velocity
while still maintaining a good code/design quality. The OpenStack tooling
has shown to work for large distributed virtual teams so let's take
advantage of it.

Carefully planning the various transitions.



Regards Susanne
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