[Openstack] Strange: lost physical connectivity to compute hosts when using native (ryu) openflow interface

Kevin Benton kevin at benton.pub
Fri Apr 28 18:03:46 UTC 2017


Ok, that's likely not the issue then. I assume the way you access each host
is via an IP assigned to an OVS bridge or an interface that somehow depends
on OVS?

On Apr 28, 2017 12:04, "Gustavo Randich" <gustavo.randich at gmail.com> wrote:

> Hi Kevin, we are using the default listen address of loopback interface:
>
> # grep -r of_listen_address /etc/neutron
> /etc/neutron/plugins/ml2/openvswitch_agent.ini:#of_listen_address =
> 127.0.0.1
>
>
>         tcp/127.0.0.1:6640 -> ovsdb-server /etc/openvswitch/conf.db
> -vconsole:emer -vsyslog:err -vfile:info --remote=punix:/var/run/openvswitch/db.sock
> --private-key=db:Open_vSwitch,SSL,private_key
> --certificate=db:Open_vSwitch,SSL,certificate --bootstrap-ca-cert=db:Open_vSwitch,SSL,ca_cert
> --no-chdir --log-file=/var/log/openvswitch/ovsdb-server.log
> --pidfile=/var/run/openvswitch/ovsdb-server.pid --detach --monitor
>
> Thanks
>
>
>
>
> On Fri, Apr 28, 2017 at 5:00 AM, Kevin Benton <kevin at benton.pub> wrote:
>
>> Are you using an of_listen_address value of an interface being brought
>> down?
>>
>> On Apr 25, 2017 17:34, "Gustavo Randich" <gustavo.randich at gmail.com>
>> wrote:
>>
>>> (using Mitaka / Ubuntu 16 / Neutron DVR / OVS / VXLAN / l2_population)
>>>
>>> This sounds very strange (to me): recently, after a switch outage, we
>>> lost connectivity to all our Mitaka hosts. We had to enter via iLO host by
>>> host and restart networking service to regain access. Then restart
>>> neutron-openvswitch-agent to regain access to VMs.
>>>
>>> At first glance we thought it was a problem with the NIC linux driver of
>>> the hosts not detecting link state correctly.
>>>
>>> Then we reproduced the issue simply bringing down physical interfaces
>>> for around 5 minutes, then up again. Same issue.
>>>
>>> And then.... we found that if instead of using native (ryu) OpenFlow
>>> interface in Neutron Openvswitch we used ovs-ofctl, the problem disappears.
>>>
>>> Any clue?
>>>
>>> Thanks in advance.
>>>
>>>
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>
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