Open Stack

Vivek--

"Member" in this case refers to an IP address that (probably) lives on a
tenant back-end network. We can't specify just the IP address when talking
to such an IP since tenant subnets may use overlapping IP ranges (ie. in
this case, subnet is required). In the case of the namespace driver and
Octavia, we use the subnet parameter for all members to determine which
back-end networks the load balancing software needs a port on.

I think the original use case for making subnet optional was the idea that
sometimes a tenant would like to add a "member" IP that is not part of
their tenant networks at all--  this is more than likely an IP address that
lives outside the local cloud. The assumption, then, would be that this IP
address should be reachable through standard routing from wherever the load
balancer happens to live on the network. That is to say, the load balancer
will try to get to such an IP address via its default gateway, unless it
has a more specific route.

As far as I'm aware, this use case is still valid and being asked for by
tenants. Therefore, I'm in favor of making member subnet optional.

Stephen

On Mon, Jan 18, 2016 at 11:14 AM, Jain, Vivek <VIVEKJAIN at ebay.com> wrote:

> If member port (IP address) is allocated by neutron, then why do we need
> to specify it explicitly? It can be derived by LBaaS driver implicitly.
>
> Thanks,
> Vivek
>
>
>
>
>
>
> On 1/17/16, 1:05 AM, "Samuel Bercovici" <SamuelB at Radware.com> wrote:
>
> >Btw.
> >
> >I am still in favor on associating the subnets to the LB and then not
> specify them per node at all.
> >
> >-Sam.
> >
> >
> >-----Original Message-----
> >From: Samuel Bercovici [mailto:SamuelB at Radware.com]
> >Sent: Sunday, January 17, 2016 10:14 AM
> >To: OpenStack Development Mailing List (not for usage questions)
> >Subject: Re: [openstack-dev] [Neutron][LBaaS][Octavia] Should subnet be
> optional on member create?
> >
> >+1
> >Subnet should be mandatory
> >
> >The only thing this makes supporting load balancing servers which are not
> running in the cloud more challenging to support.
> >But I do not see this as a huge user story (lb in cloud load balancing
> IPs outside the cloud)
> >
> >-Sam.
> >
> >-----Original Message-----
> >From: Brandon Logan [mailto:brandon.logan at RACKSPACE.COM]
> >Sent: Saturday, January 16, 2016 6:56 AM
> >To: openstack-dev at lists.openstack.org
> >Subject: [openstack-dev] [Neutron][LBaaS][Octavia] Should subnet be
> optional on member create?
> >
> >I filed a bug [1] a while ago that subnet_id should be an optional
> parameter for member creation.  Currently it is required.  Review [2] is
> makes it optional.
> >
> >The original thinking was that if the load balancer is ever connected to
> that same subnet, be it by another member on that subnet or the vip on that
> subnet, then the user does not need to specify the subnet for new member if
> that new member is on one of those subnets.
> >
> >At the midcycle we discussed it and we had an informal agreement that it
> required too many assumptions on the part of the end user, neutron lbaas,
> and driver.
> >
> >If anyone wants to voice their opinion on this matter, do so on the bug
> report, review, or in response to this thread.  Otherwise, it'll probably
> be abandoned and not done at some point.
> >
> >Thanks,
> >Brandon
> >
> >[1] https://bugs.launchpad.net/neutron/+bug/1426248
> >[2] https://review.openstack.org/#/c/267935/
> >__________________________________________________________________________
> >OpenStack Development Mailing List (not for usage questions)
> >Unsubscribe:
> OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> >http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >
> >__________________________________________________________________________
> >OpenStack Development Mailing List (not for usage questions)
> >Unsubscribe:
> OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> >http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >
> >__________________________________________________________________________
> >OpenStack Development Mailing List (not for usage questions)
> >Unsubscribe:
> OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> >http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> __________________________________________________________________________
> OpenStack Development Mailing List (not for usage questions)
> Unsubscribe: OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>



-- 
Stephen Balukoff
Principal Technologist
Blue Box, An IBM Company
www.blueboxcloud.com
sbalukoff at blueboxcloud.com
206-607-0660 x807
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20160118/d28e67d0/attachment.html>