[Openstack-operators] Mitaka to Newton networking issues

Neil Jerram neil at tigera.io
Mon Dec 5 15:54:33 UTC 2016

I have also recently been seeing 'Could not load <whatever>InterfaceDriver'
warnings from the DHCP agent, and haven't yet understood that - although
I'm pretty sure that my interface driver is being loaded really - or else
none of my networking function would work at all.

So it's possible that that part of your report is benign, and just a
misleading warning.  That said, I am still worried about it too, and would
like to understand it properly.

I'm not aware of seeing the other symptoms you mentioned.


On Mon, Dec 5, 2016 at 3:14 PM Grant Morley <grant at absolutedevops.io> wrote:

> Hi All,
> We have just upgraded from Mitaka to Newton. We are running OSA and we
> seem to have come across some weird networking issues since the upgrade.
> Basically network access to instances is very intermittent and seems to
> randomly stop working.
> We are running neutron in HA and it appears that both of the neutron nodes
> are now trying to be master and are both trying to bring up the gateway IP
> addresses which would be causing conflicts.
> We are also seeing a lot of the following in the "neutron-dhcp-agent" log
> files:
> 2016-12-05 14:42:24.837 2020 WARNING stevedore.named
> [req-1955d0a1-1453-4c65-a93a-54e8ea39b230 1ac995c0729142289f7237222f335806
> 3cc95dbe91c84e3e8ebbb9893ee54d20 - - -] Could not load
> neutron.agent.linux.interface.BridgeInterfaceDriver
> 2016-12-05 14:42:42.803 2020 INFO neutron.agent.dhcp.agent
> [req-fad7d2bb-9d3c-4192-868a-0164b382aecf 1ac995c0729142289f7237222f335806
> 3cc95dbe91c84e3e8ebbb9893ee54d20 - - -] Trigger reload_allocations for port
> admin_state_up=True, allowed_address_pairs=[], binding:host_id=,
> binding:profile=, binding:vif_details=, binding:vif_type=unbound,
> binding:vnic_type=normal, created_at=2016-12-05T14:42:42Z, description=,
> device_id=8752effa-2ff2-4ce1-be70-e9f2243612cb,
> device_owner=network:floatingip, extra_dhcp_opts=[],
> fixed_ips=[{u'subnet_id': u'4ca7db2d-544a-4a97-b5a4-3cbf2467a4b7',
> u'ip_address': u'XXX.XXX.XXX.XXX'}],
> id=b3cf223d-8e76-484a-a649-d8a7dd435124, mac_address=fa:16:3e:ff:0d:50,
> name=, network_id=af5db886-0178-4f8d-9189-f55f773b37fa,
> port_security_enabled=False, project_id=, revision_number=4,
> security_groups=[], status=N/A, tenant_id=, updated_at=2016-12-05T14:42:42Z
> I am a bit concerned about neutron not being able to load the Bridge
> interface driver.
> Has anyone else come across this at all or have any pointers? This was
> working fine in Mitaka it just seems since the upgrade to Newton, we have
> these issues.
> I am able to provide more logs if they are needed.
> Regards,
> --
> Grant Morley
> Cloud Lead
> Absolute DevOps Ltd
> Units H, J & K, Gateway 1000, Whittle Way, Stevenage, Herts, SG1 2FP
> www.absolutedevops.io grant at absolutedevops.io <grant at absolutedevops.i> 0845
> 874 0580
> _______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
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