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Making sure all drivers support the features offered in Neutron LBaaS means
we are stuck going with the 'least common denominator' in all cases. While
this ensures all vendors implement the same things in the functionally the
same way, it also is probably a big reason the Neutron LBaaS project has
been so incredibly slow in seeing new features added over the last two
years.

In the gerrit review that Dustin linked, it sounds like the people
contributing to the discussion are in favor of allowing drivers to reject
some configurations as unsupported through use of exceptions (details on
how that will work is being hashed out now if you want to participate in
that discussion).  Let's assume, therefore, that with the LBaaS v2 API and
Object model we're also going to get this ability-- which of course also
means that drivers do not have to support every feature exposed by the API.

(And again, as Dustin pointed out, a Linux LVS-based driver definitely
wouldn't be able to support any L7 features at all, yet it's still a very
useful driver for many deployments.)

Finally, I do not believe that the LBaaS project should be "held back"
because one vendor's implementation doesn't work well with a couple
features exposed in the API. As Dustin said, let the API expose a rich
feature set and allow drivers to reject certain configurations when they
don't support them.

Stephen



On Tue, Jun 24, 2014 at 9:09 AM, Dustin Lundquist <dustin at null-ptr.net>
wrote:

> I brought this up on https://review.openstack.org/#/c/101084/.
>
>
> -Dustin
>
>
> On Tue, Jun 24, 2014 at 7:57 AM, Avishay Balderman <AvishayB at radware.com>
> wrote:
>
>>  Hi Dustin
>>
>> I agree with the concept you described but as far as I understand it is
>> not currently supported in Neutron.
>>
>> So a driver should be fully compatible with the interface it implements.
>>
>>
>>
>> Avishay
>>
>>
>>
>> *From:* Dustin Lundquist [mailto:dustin at null-ptr.net]
>> *Sent:* Tuesday, June 24, 2014 5:41 PM
>> *To:* OpenStack Development Mailing List (not for usage questions)
>> *Subject:* Re: [openstack-dev] [Neutron][LBaaS] Layer7 Switching - L7
>> Rule - comapre_type values
>>
>>
>>
>> I think the API should provide an richly featured interface, and
>> individual drivers should indicate if they support the provided
>> configuration. For example there is a spec for a Linux LVS LBaaS driver,
>> this driver would not support TLS termination or any layer 7 features, but
>> would still be valuable for some deployments. The user experience of such a
>> solution could be improved if the driver to propagate up a message
>> specifically identifying the unsupported feature.
>>
>>
>>
>>
>>
>> -Dustin
>>
>>
>>
>> On Tue, Jun 24, 2014 at 4:28 AM, Avishay Balderman <AvishayB at radware.com>
>> wrote:
>>
>> Hi
>>
>> One of L7 Rule attributes is ‘compare_type’.
>>
>> This field is the match operator that the rule should activate against
>> the value found in the request.
>>
>> Below is list of the possible values:
>>
>> - Regexp
>>
>> - StartsWith
>>
>> - EndsWith
>>
>> - Contains
>>
>> - EqualTo (*)
>>
>> - GreaterThan (*)
>>
>> - LessThan (*)
>>
>>
>>
>> The last 3 operators (*) in the list are used in numerical matches.
>>
>> Radware load balancing backend does not support those operators   “out of
>> the box” and a significant development effort should be done in order to
>> support it.
>>
>> We are afraid to miss the Junu timeframe if we will have to focus in
>> supporting the numerical operators.
>>
>> Therefore we ask to support the non-numerical operators for Junu and add
>> the numerical operators support post Junu.
>>
>>
>>
>> See
>> https://review.openstack.org/#/c/99709/4/specs/juno/lbaas-l7-rules.rst
>>
>>
>>
>> Thanks
>>
>> Avishay
>>
>>
>> _______________________________________________
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>> OpenStack-dev at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>
>>
>>
>> _______________________________________________
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>>
>>
>
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>
>


-- 
Stephen Balukoff
Blue Box Group, LLC
(800)613-4305 x807
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