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
elk-cluster
********
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, SWITZERLAND
+41 21 732 03 79
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