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example of mapping ovs interfaces of tenant vm to neutron port, subnet, tenant id

Flavio Fernandes <ffernand@...>
 

Hi folks,

I was asked for an example dump of an openstack config on ovsdb netvirt and how one can piece mail the ovs ports
to the overlay network that goes with it.

For that, I ‘devstacked' 3 nodes using my one trick pony github [1] repo. ;)

Then, I created 2 tenants with 2 internal subnets and put 2 vms in each with floating ips.

The output of operational tree using my handy tool [3] looked like this [4] ([5] with flows).

The output from neutron’s rest interface gave me this [6].

Pulling the string for a tenant port in openstack compute node 192.168.50.22 —as an example-- you can see that:

* lines 14, 15, 30, 31, 37 and 40 from [4] represent the tunnel ports that interconnect the openstack nodes

* line 42 from [4] is:  of:6   tapbd8efa88-36   mac:fa:16:3e:fb:d9:bf   ifaceId:bd8efa88-3665-409a-a7fa-47663a9089b2.
 So, the tenant vm that owns that port is in compute node 192.168.50.22. 

  br-int in that node is aka openflow:191757013640004 (charlie)

  If you search for ‘47663a9089b2’ in [6], you will find it belongs to neutron port that has address 10.20.0.3 and
  belongs to subnet id 8daa2590-67d9-45c1-b956-f820aa5dba43. That is on line 691 of [6].

  Furthermore you can see that it belongs to tenant 33d676feac934d98a809eadfd8e5e985, mentioned in line 702.
 
* with that, you can connect the dots and find all neutron ports that belong to a certain subnet / tenant, as well as the bridge
  and openstack nodes they are located.

These where the curl commands that dumped me the crud tables in neutron northbound [7]. I’m pretty sure that can be obtained
via mdsal’s restconf too, but I am not too familiar with that yet.

Hope this helps. :)

— flavio









===

$ ./showOvsdbMdsal.py -f
aliasMap:

  alpha      -> openflow:50647211443526

  bravo      -> openflow:8796758886516

  charlie    -> openflow:191757013640004

  delta      -> openflow:8796757453186

  echo       -> openflow:68498488746567

  foxtrot    -> openflow:8796764052230

 

ovsdbNode:192.168.50.20:47988 mgr:192.168.50.1:6640 version:2.3.2

  alpha:br-int

    of:1 tap165bbfcf-50 mac:fa:16:3e:43:d0:5f ifaceId:165bbfcf-50ec-4e33-b978-5e2310097403

    of:2 patch-ext

    of:3 vxlan-192.168.50.21

    of:4 vxlan-192.168.50.22

    of:5 tap207df591-ca mac:fa:16:3e:97:c3:a5 ifaceId:207df591-ca7f-4da3-b156-5af408b14ac7

    of:6 tapce6a55b8-6f mac:fa:16:3e:bd:aa:21 ifaceId:ce6a55b8-6f6b-419a-814c-7075f22d0fe3

    of:7 tap79cb76bd-d9 mac:fa:16:3e:b3:52:57 ifaceId:79cb76bd-d959-44bf-b203-1af6f55def8d

    of:8 tap412bb62b-48 mac:fa:16:3e:8a:5c:3b ifaceId:412bb62b-48ba-454e-b370-207fd550f12b

    of:9 tap5f960323-fc mac:fa:16:3e:b8:26:17 ifaceId:5f960323-fcaa-4b6a-aea7-f25c579fa909

    of:10 tape713da3b-5e mac:fa:16:3e:83:11:af ifaceId:e713da3b-5e04-4496-b5a4-14aa8ebcd5f9

  bravo:br-ex

    of:1 eth2

    of:2 patch-int

ovsdbNode:192.168.50.21:51445 mgr:192.168.50.1:6640 version:2.3.2

  delta:br-ex

    of:1 eth2

    of:2 patch-int

  echo:br-int

    of:1 vxlan-192.168.50.20

    of:2 vxlan-192.168.50.22

    of:3 tap055b988d-4e mac:fa:16:3e:50:48:1c ifaceId:055b988d-4e4c-48f9-a479-50b725c10655

    of:4 patch-ext

    of:5 tap70290b63-bc mac:fa:16:3e:18:1c:64 ifaceId:70290b63-bc50-4191-bf00-55f1b9794ef8

ovsdbNode:192.168.50.22:52843 mgr:192.168.50.1:6640 version:2.3.2

  charlie:br-int

    of:1 vxlan-192.168.50.20

    of:2 tapbce1a32b-3b mac:fa:16:3e:92:06:83 ifaceId:bce1a32b-3b4b-4ba1-a05b-b157989abccb

    of:3 patch-ext

    of:4 vxlan-192.168.50.21

    of:5 tap2c38c301-52 mac:fa:16:3e:2c:6b:e0 ifaceId:2c38c301-526a-49b0-b4d6-5c74cb7e5c22

    of:6 tapbd8efa88-36 mac:fa:16:3e:fb:d9:bf ifaceId:bd8efa88-3665-409a-a7fa-47663a9089b2

  foxtrot:br-ex

    of:1 eth2

    of:2 patch-int

 

ofLinks (discover via lldp):

  charlie:1 <-> alpha:4

  charlie:3 <-> foxtrot:2

  charlie:4 <-> echo:2

  alpha:2 <-> bravo:2

  alpha:3 <-> echo:1

  echo:4 <-> delta:2

  delta:1 -> bravo:1

  bravo:1 <-> foxtrot:1



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