What is the process or dependencies by which OVN determines a logical
routers interface(s) to be in a "ACTIVE" or "DOWN" state and notify
Neutron of that status upstream? I read
https://docs.openstack.org/networking-ovn/ocata/design/ovn_worker.html
document, but it seems to refer to virtual machines that are
created/destroyed and I am unsure if the same applies to logical
routers. I have seen now on several occasions where OVN will report a
network port as down for no reason then up then back down similar to a
traditional network link flap, but ultimately the port remains in a down
state (example below) and can find now way to bring the port online.
In troubleshooting this issue I can find/see no obvious errors in the
logs for OVS, OVN, or Neutron, and this does not occur with instance
ports, all of the patch ports on the compute node appear to be in place,
and the integration bridge (br-int) is up and running (two instances on
the same subnet are able to communicate). This is on Ocata release,
CentOS 7, OVS/OVN 2.6.1 from package not source.
cat /var/log/neutron/server.log | grep "networking_ovn.ml2.mech_driver"
| awk '{ print $1=$2=""; print $0}'
5393 INFO networking_ovn.ml2.mech_driver
[req-d4aa53c5-b78e-4360-9c9e-194f76cdb15c - - - - -] Starting
OVNMechanismDriver
5416 INFO networking_ovn.ml2.mech_driver [-] OVN reports status up for
port: 90b16a19-11d9-4844-8fbe-2340367f18d5
5416 INFO networking_ovn.ml2.mech_driver
[req-347dbab3-4326-4a0d-b77c-eccc5532bee1 - - - - -] OVN reports status
down for port: 90b16a19-11d9-4844-8fbe-2340367f18d5
5416 INFO networking_ovn.ml2.mech_driver
[req-347dbab3-4326-4a0d-b77c-eccc5532bee1 - - - - -] OVN reports status
up for port: 90b16a19-11d9-4844-8fbe-2340367f18d5
5416 INFO networking_ovn.ml2.mech_driver
[req-347dbab3-4326-4a0d-b77c-eccc5532bee1 - - - - -] OVN reports status
down for port: 90b16a19-11d9-4844-8fbe-2340367f18d55
openstack port list
+--------------------------------------+------+-------------------+----------------------------------------------------------------------------+--------+
| ID | Name | MAC Address |
Fixed IP
Addresses | Status |
+--------------------------------------+------+-------------------+----------------------------------------------------------------------------+--------+
| 90b16a19-11d9-4844-8fbe-2340367f18d5 | | fa:16:3e:b6:bd:29 |
ip_address='172.18.0.1',
subnet_id='8bfc9808-ba56-49ce-b308-ed6d7f1c6701' | DOWN |
+--------------------------------------+------+-------------------+----------------------------------------------------------------------------+--------+
openstack router list
+--------------------------------------+-------------------+--------+-------+-------------+-------+----------------------------------+
| ID | Name | Status |
State | Distributed | HA | Project |
+--------------------------------------+-------------------+--------+-------+-------------+-------+----------------------------------+
| e2b7766b-2121-4874-babe-080f6ef8ad84 | router-internal-1 | ACTIVE |
UP | False | False | 6cde3f9359c84acdb6ae916d438045bf |
+--------------------------------------+-------------------+--------+-------+-------------+-------+----------------------------------+
Cheers,
-C
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