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Hi,
sorry if this is not the right place to post this; if it is not, please tell me in which forum I can post.

I'm experiencing an error while installing the open vSwitch plugin agent on the compute node (a host running only the nova-compute service).

I'm following the official guide:

http://docs.openstack.org/trunk/openstack-network/admin/content/install_fedora.html

I haven't got any problem during the quantum-server installation and configuration on the cloud controller, and there the quantum-server daemon runs correctly as I verified in its logfile.

When trying to create the br-int with the command reported here: http://docs.openstack.org/trunk/openstack-network/admin/content/fedora_q_agent.html (ovs-vsctl add-br br-int) I get this error message:

2013-05-22T14:19:06Z|00002|reconnect|WARN|unix:/var/run/openvswitch/db.sock: connection attempt failed (No such file or directory)
ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)

it seems something related to the missing openvswitch services running. Then I tried to start them:

service quantum-openvswitch-agent start

but the result is even worst:

Stderr: 'sudo: no tty present and no askpass program specified\n'
2013-05-22 16:19:02    ERROR [quantum.agent.linux.ovs_lib] Unable to execute ['ovs-ofctl', 'del-flows', 'br-int']. Exception: 
Command: ['sudo', 'ovs-ofctl', 'del-flows', 'br-int']
Exit code: 1
Stdout: ''
Stderr: 'sudo: no tty present and no askpass program specified\n'
2013-05-22 16:19:02    ERROR [quantum.agent.linux.ovs_lib] Unable to execute ['ovs-ofctl', 'add-flow', 'br-int', 'hard_timeout=0,idle_timeout=0,priority=1,actions=normal']. Exception: 
Command: ['sudo', 'ovs-ofctl', 'add-flow', 'br-int', 'hard_timeout=0,idle_timeout=0,priority=1,actions=normal']
Exit code: 1
Stdout: ''
Stderr: 'sudo: no tty present and no askpass program specified\n'
2013-05-22 16:19:02 CRITICAL [quantum] [Errno 19] No such device

Of course I verified that the commands sudo and ovs-ofctl are there. 

Any idea ?

thanks,

 Alvise
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