[Openstack-operators] Mitaka to Newton networking issues

Kevin Benton kevin at benton.pub
Tue Dec 6 10:14:10 UTC 2016

Yes, that is a misleading warning. What is happening is that it's trying to
load the interface driver as an alias first, which results in a stevedore
warning that you see and then it falls back to loading it by the class
path, which is what you have configured. We will need to see if there is a
way we can suppress that warning somehow when we make the call to load by
an alias and it fails.

If you switch your interface to just 'linuxbridge', that should get rid of
the warning.

For both L3 HA nodes becoming master, we need a little more info to figure
out the root cause. Can you try switching into the router namespace on one
of the L3 HA nodes and see if you can ping the other router instance across
the L3 HA network for that router?

On Mon, Dec 5, 2016 at 7:54 AM, Neil Jerram <neil at tigera.io> wrote:

> 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.
>      Neil
> 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
>> <http://www.absolutedevops.io/>www.absolutedevops.io
>> <grant at absolutedevops.i>grant at absolutedevops.io 0845 874 0580
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