[Openstack] Neutron hostname fqdn

Aviolat Romain Romain.Aviolat at nagra.com
Wed Feb 18 14:53:00 UTC 2015

Thanks Gustavo it works as expected, you made my day.

I was looking for this variable but I couldn't find it in the documentation and/or the config file.

Thanks again.


-----Original Message-----
From: gustavo panizzo (gfa) [mailto:gfa at zumbi.com.ar] 
Sent: mercredi 18 février 2015 14:05
To: Aviolat Romain; openstack at lists.openstack.org
Cc: Frank Laforsch (f.laforsch at arista.com)
Subject: Re: [Openstack] Neutron hostname fqdn

you can set the value host=fqdn in neutron.conf as you do with nova

On February 18, 2015 6:53:15 PM GMT+08:00, Aviolat Romain <Romain.Aviolat at nagra.com> wrote:
>Dear openstack community,
>I have an openstack setup composed of Arista switches for the network 
>part. I'm using the ml2 driver to do the vlan provisioning on the 
>switches and openvswitch for the provisioning on the compute-nodes.
>The switches are using LADV (LLDP) to discover where each compute nodes 
>are connected (which switch port). The ladvd agent on the compute-nodes 
>is always broadcasting the full qualified domain name (fqdn) of the 
>nodes, there is no option to broadcast only the machine names.
>The communication between neutron and the switches is working great:
>(on the Arista switches)
>#show openstack vm
>Region: regionOne
>   Tenant Name: test
>   Tenant Id: b747adc6dfdb41eba0af96e63b23be5f
>     VM Name   VM Id                                  Host Network Name
>--------- --------------------------------------
>     test   ae301701-aaf7-45f6-ad0c-19720b189a44   cloudcompute2 
>The problem is that nova is not sending the FQDN of the compute-node, 
>so the switch is not able to match on which compute-node port it should 
>create the VLAN.
>(on the Arista switches)
>#show network physical-topology hosts
>Unique Id            Hostname
>-------------------- ------------------------------
>0cc4.7a45.f600       cloudcompute0.domain.com
>0cc4.7a43.8e7c       cloudcompute1.domain.com
>0cc4.7a0b.2446       cloudcompute2.domain.com
>my workaround was to set the nova "host" variable, on each 
>compute-node, to the FQDN (host=cloudcomputeX.domain.com). The switches 
>were now matching the compute-nodes lldp information and created the 
>VLANs accordingly. But... Then openvswitch was unable to provision the 
>compute-nodes because it seems that neutron is still using the short 
>machine name instead of the FQDN.
>neutron agent-list
>| id                                   | agent_type         | host     
>       | alive | admin_state_up | binary                    |
>| 9c3327c0-c94c-4165-852d-e51d706f0ab7 | Open vSwitch agent
>|cloudcompute0    | :-)   | True           | neutron-openvswitch-agent
>So I don't know if it's possible to force neutron to use a certain 
>hostname like I did for nova. I forgot to say that I'm using rabbitmq 
>as messaging system. I saw that ZeroMQ for example has that kind of
>option:  rpc_zmq_host=[hostname]
>Thanks for your help
>Romain Aviolat
>Senior System Administrator - R&D and ops Infrastructure Kudelski 
>Security - Kudelski Group rte de Genève 22-24, 1033 Cheseaux, 
>+41 21 732 03 79
>Mailing list:
>Post to     : openstack at lists.openstack.org
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