For example, say I want to find out which tap port on my VM is connected to an openvswitch bridge. I would have to look up the VM in nova and find the corresponding IP assigned to it.
[root@centos-6-5-openstack ~(keystone_admin)]# nova list
+--------------------------------------+------+--------+------------+-------------+---------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+------+--------+------------+-------------+---------------------+
| 8b3ecae9-7b59-4b6f-a0a0-bbd5ab5aa629 | aa | ACTIVE | - | Running | net1=192.168.251.10 |
| a679f6f9-bd7d-4e31-95a6-9776c44f0a4a | bb | ACTIVE | - | Running | net1=192.168.251.12 |
Then I would list the ports in neutron.
[root@centos-6-5-openstack ~(keystone_admin)]# neutron port-list
+--------------------------------------+-------------+-------------------+---------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+-------------+-------------------+---------------------------------------------------------------------------------------+
| 014d6bba-7ab9-4028-9cd9-dbe27bd51b83 | | fa:16:3e:1b:19:7d | {"subnet_id": "8942189b-8fbf-44e9-adbb-d62dd0d27015", "ip_address": "192.168.250.10"} |
| 1d3246d7-adb1-4b18-a911-b36562c278e0 | | fa:16:3e:bd:e9:69 | {"subnet_id": "0147052f-2a0b-4a5b-9930-1d4e258e0c1a", "ip_address": "192.168.251.10"} |
| 40b988aa-c016-4e85-b9cf-beeb4332ab04 | | fa:16:3e:e1:7e:57 | {"subnet_id": "0147052f-2a0b-4a5b-9930-1d4e258e0c1a", "ip_address": "192.168.251.12"} |
| cb867d96-a4ed-449d-a35a-f3670a14e710 | | fa:16:3e:ce:a5:7e | {"subnet_id": "0147052f-2a0b-4a5b-9930-1d4e258e0c1a", "ip_address": "192.168.251.11"} |
| d267267b-5630-43df-8a07-05793fd831d0 | | fa:16:3e:61:84:91 | {"subnet_id": "8942189b-8fbf-44e9-adbb-d62dd0d27015", "ip_address": "192.168.250.11"} |
| f434c257-5bbf-42a6-9136-072d1104fa19 | | fa:16:3e:24:18:08 | {"subnet_id": "0147052f-2a0b-4a5b-9930-1d4e258e0c1a", "ip_address": "192.168.251.1"} |
+--------------------------------------+-------------+-------------------+---------------------------------------------------------------------------------------+
Next I would need to look at the mac address and do a lookup in ip address
After coming through the list I can then verify the tap address with ip address show tapxxxx
[root@centos-6-5-openstack ~(keystone_admin)]# ip a show tap40b988aa-c0
30: tap40b988aa-c0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
link/ether fe:16:3e:e1:7e:57 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc16:3eff:fee1:7e57/64 scope link
valid_lft forever preferred_lft forever
And now I can do something useful like see which bridge the tap interface belongs to and verify the mac in the mac table.
[root@centos-6-5-openstack ~(keystone_admin)]# brctl show
bridge name bridge id STP enabled interfaces
qbr1d3246d7-ad 8000.4a04d0b90d18 no qvb1d3246d7-ad
tap1d3246d7-ad
qbr40b988aa-c0 8000.de752effa37c no qvb40b988aa-c0
tap40b988aa-c0
qbr7316a274-16 8000.8671bda4d699 no qvb7316a274-16
tap7316a274-16
qbrd06fccba-ad 8000.4613c3848432 no qvbd06fccba-ad
tapd06fccba-ad
[root@centos-6-5-openstack ~(keystone_admin)]# brctl showmacs qbr40b988aa-c0
port no mac addr is local? ageing timer
1 de:75:2e:ff:a3:7c yes 0.00
2 fe:16:3e:e1:7e:57 yes 0.00
or look at the openvswitch table and find out which bridge it belongs to
[root@centos-6-5-openstack ~(keystone_admin)]# ovs-vsctl list-ifaces br-int
int-br-ex
qr-87202226-14
qr-ba3e1c3b-49
qr-f2b01b2b-ad
qr-f434c257-5b
qvo1d3246d7-ad
qvo40b988aa-c0
qvo7316a274-16
qvod06fccba-ad
tapafe229a7-2e
tapca265ec6-29
tapcb867d96-a4
tape4751034-2c
This looks like a to do scripting project to get this information.
Here I could create a table that would give me:
Nova ID
VM name
VM IP
VM Mac address
Neutron ID
tap interface
bridge mac table
openvswitch bridge
