<br><br><div class="gmail_quote">On Thu, Nov 29, 2012 at 12:11 PM, John Gruber <span dir="ltr"><<a href="mailto:john.t.gruber@gmail.com" target="_blank">john.t.gruber@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Looking for advice... <div><br></div><div>I am working with Quantum as an IPAM solution and preparing for the basic methods needed to get L3 addressing on the appropriate subnets for an LBaaS device cluster. </div><div><br>
</div><div>Because every L3 address object inside a L2 failover domain will require the same MAC address, I can't just create separate ports for each L3 object as the MAC address can only be 'in-use' on one port at a time for Quantum. This makes sense, but leads me to a problem. There is neither 1) a way to specify the number of fixed IP addresses you want allocated when you create a port nor 2) a way to update a port telling Quantum to allocate an additional fixed IPs to that port. </div>
<div><br></div><div>So I am left with tracking all the ports for a network, mapping them to subnets, doing IP address math to understand the start and end of the allocation pool, then trying to 'guess', with possibly repeated update calls to the port, what new set of fixed IPs I can put together, letting exceptions occur to tell me if I need to try again. This is a bad plan. I have not done this yet, but will if I have to. Basically reproducing a lot of Quantum IPAM business logic outside of Quantum. </div>
<div><br></div><div>Is this why it was suggested just to access the DB directly?</div><div><br></div><div>I'm really hoping that I'm wrong and there is a way in the Quantum API that I missed to simply get additional fixed IPs allocated for a port on the same subnet. Seems like an obvious requirement even for VM hosts with aliased IP addresses on the same quantum port, so I had assumed it was would be in the API syntax.</div>
<div><br></div><div>I see bugs for multiple floating IPs:</div><div><br></div><div><a href="https://bugs.launchpad.net/quantum/+bug/1057844" target="_blank">https://bugs.launchpad.net/quantum/+bug/1057844</a><br></div><div>
<br></div><div>
and advice on adding multiple fixed IPs on different subnets:</div><div><br></div><div><a href="https://lists.launchpad.net/openstack/msg17634.html" target="_blank">https://lists.launchpad.net/openstack/msg17634.html</a><br>
</div><div><br>
</div><div>But I am missing how to create multiple fixed_ips on the same subnet for the same port. Preferably calls to update a port and have Quantum allocate additional fixed_ips without the client having to already know which IPs it can have.<br>
</div></blockquote><div><br></div><div>From what I'm reading, it would be exactly like the example you linked to above, but specify the same subnet-id twice if you want both of the fixed IPs to be from the same subnet. </div>
<div><br></div><div><div>nicira@com-dev:~/devstack$ quantum subnet-list -c id -c network_id</div><div>+--------------------------------------+--------------------------------------+</div><div>| id | network_id |</div>
<div>+--------------------------------------+--------------------------------------+</div><div>| 2ff33f9d-0468-4d60-97c3-3a41e1ae1d25 | a1d4ed77-122a-42d6-97eb-0e8394005374 |</div><div>+--------------------------------------+--------------------------------------+</div>
</div><div><br></div><div><br></div><div><div>nicira@com-dev:~/devstack$ quantum port-create --fixed-ip subnet_id=2ff33f9d-0468-4d60-97c3-3a41e1ae1d25 --fixed-ip subnet_id=2ff33f9d-0468-4d60-97c3-3a41e1ae1d25 a1d4ed77-122a-42d6-97eb-0e8394005374</div>
<div>Created a new port:</div><div>+----------------+---------------------------------------------------------------------------------+</div><div>| Field | Value |</div>
<div>+----------------+---------------------------------------------------------------------------------+</div><div>| admin_state_up | True |</div>
<div>| device_id | |</div><div>| device_owner | |</div>
<div>| fixed_ips | {"subnet_id": "2ff33f9d-0468-4d60-97c3-3a41e1ae1d25", "ip_address": "10.1.0.7"} |</div><div>| | {"subnet_id": "2ff33f9d-0468-4d60-97c3-3a41e1ae1d25", "ip_address": "10.1.0.8"} |</div>
<div>| id | 20ae47bc-8708-4c65-b761-67d4c8672964 |</div><div>| mac_address | fa:16:3e:c2:82:74 |</div>
<div>| name | |</div><div>| network_id | a1d4ed77-122a-42d6-97eb-0e8394005374 |</div>
<div>| status | ACTIVE |</div><div>| tenant_id | 80a03bf4d7a04839a2ff149357733260 |</div>
<div>+----------------+---------------------------------------------------------------------------------+</div></div><div><br></div><div>Is this sufficient, or am I misunderstanding what you're asking?</div><div><br>
</div>
<div>Dan</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
</div><div><br></div><div>I even see recent messages where the libvirt driver only support 1 IP per vif right now:</div><div><br></div><div><a href="http://www.gossamer-threads.com/lists/openstack/dev/20264" target="_blank">http://www.gossamer-threads.com/lists/openstack/dev/20264</a><br>
</div><div><br></div><div>That doesn't help the LBaaS device.</div><div><br></div><div>I didn't find anything obvious showing how to allocate multiple fixed_ips on the same port on the same subnet. Forgetting HA even for a minute, won't we need to allocate a fixed_ip for each VIP on a Quantum managed subnet? We might be doing this a lot no?</div>
<div><br></div><div>Am I missing something obvious? </div><span class="HOEnZb"><font color="#888888"><div><br></div><div>John Gruber</div><div><br></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>Dan Wendlandt <div>Nicira, Inc: <a href="http://www.nicira.com" target="_blank">www.nicira.com</a><br><div>twitter: danwendlandt<br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~<br></div></div><br>