[Bug 1998781] Re: yoga: neutron-ovn-metadata-agent unable to communicate via ovn-relay

[Frode Nordahl]

While it does not appear to be the root of the issue reported, the bug
report has revealed a possible room for improvement in the relationship
between the real server and the relay server with regards to the
inactivity_probe configuration.

The inactivity_probe is normally adjusted on the backend server to avoid
situations where the backend server is too busy to service the
inactivity probe in a timely manner and as a consequence erroneously
drops the connection.

Having the inactivity_probe configuration out of sync between the real
server and the relay could possibly lead to more of these situations,
and it would increase complexity of configuration if we leave it to the
human operator to keep these things in sync. Perhaps we should teach the
backend server and relay to communicate this setting between each other?

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https://bugs.launchpad.net/bugs/1998781

Title:
  yoga: neutron-ovn-metadata-agent unable to communicate via ovn-relay

Status in Sunbeam Snap:
  New
Status in openvswitch package in Ubuntu:
  Confirmed

Bug description:
  For a Yoga base deployment (OVN: 22.03, OVS: 2.17.2) the neutron-ovn-
  metadata-agent continually reconnects to the ovn-central services via
  ovn-relay - the inactivity probe timeout is set to 60 seconds in OVN
  central and on the client side so I think the issue is that the ovn-
  relay is probing with a 5 second timeout and then resetting
  connections.

  ovn-relay log:

  2022-12-05T11:19:54.403Z|21688|reconnect|DBG|ssl:ovn-central-0.ovn-central-endpoints.openstack.svc.cluster.local:6642: idle 5003 ms, sending inactivity probe
  2022-12-05T11:19:54.403Z|21689|reconnect|DBG|ssl:ovn-central-0.ovn-central-endpoints.openstack.svc.cluster.local:6642: entering IDLE
  2022-12-05T11:19:54.403Z|21690|jsonrpc|DBG|ssl:ovn-central-0.ovn-central-endpoints.openstack.svc.cluster.local:6642: send request, method="echo", params=[], id="echo"

  by passing the ovn-relay and communicating directly with the SB db
  server worked around this issue.

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