Hello,
I have two Openstack nodes (controller & Compute and a Compute). VM's are 
getting launched fine on the node that also acts as the controller. But, the 
VM's that are scheduled on the compute node seems to go to error state. I am 
running Icehouse version and my ML2 type driver is VXLAN. I used devstack for 
my installation. If I use non-tunnel mode and change it to VLAN, I don't see 
this error and VM's are launched fine in compute nodes as well.
My nova.conf in compute does have the following: 

neutron_url = http://192.28.10.149:9696

neutron_admin_auth_url = http://192.28.10.149:35357/v2.0
Ofcourse, the above IP addresses of controller are reachable from compute.
This is what I have in my ml2_conf.ini in my controller. 

[ml2] 

tenant_network_types = vxlan
type_drivers = vxlan
mechanism_drivers = openvswitch
I assume this file on compute is not needed.
The error I see on Nova screen is : 
2014-04-06 10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d -8e77-24a45dc7f652] File 
"/opt/stack/python-neutronclient/neutronclient/v2_0/c lient.py", line 1315, in 
_pagination 2014-04-06 10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d-8e77-24a45dc7f652] res = self.get(path, params=params) 
2014-04-06 10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d-8e77-24a45dc7f652] File 
"/opt/stack/python-neutronclient/neutronclient/v2_0/client.py", line 1288, in 
get 2014-04-06 10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d-8e77-24a45dc7f652] headers=headers, params=params) 
2014-04-06 10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d-8e77-24a45dc7f652] File 
"/opt/stack/python-neutronclient/neutronclient/v2_0/client.py", line 1280, in 
retry_request 2014-04-06 10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d-8e77-24a45dc7f652] raise
 exceptions.ConnectionFailed(reason=_("Maximum attempts reached")) 2014-04-06 
10:49:45.906 TRACE nova.compute.manager [instance: 
efede8e5-6bdb-4c2d-8e77-24a45dc7f652] ConnectionFailed: Connection to neutron 
failed: Maximum attempts reached 2014-04-06 10:49:45.906 TRACE 
nova.compute.manager [instance: efede8e5-6bdb-4c2d-8e77-24a45dc7f652]
Pls let me know if you need more information.
My localrc on Controller is (relevant ones that i thought):
enable_service q-l3
enable_service quantum
Q_PLUGIN=ml2
Q_ML2_PLUGIN_MECHANISM_DRIVERS=openvswitch
Q_ML2_TENANT_NETWORK_TYPE=vxlan
Q_ML2_PLUGIN_TYPE_DRIVERS=vxlan
Q_PLUGIN_EXTRA_CONF_PATH=/home/user1/ML2/devstack
ENABLE_TENANT_VLANS=False
PHYSICAL_NETWORK=physnet2
OVS_PHYSICAL_BRIDGE=br-eth3
ENABLE_TENANT_TUNNELS=True

localrc on compute is:
Q_PLUGIN=ml2
Q_ML2_TENANT_NETWORK_TYPE=vxlan
ENABLE_TENANT_TUNNELS=True
Thanks, 

Paddu
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