Comment 3 for bug 719004

i have similiar

(nova.root): TRACE: Traceback (most recent call last):
(nova.root): TRACE: File "/usr/bin/nova-network", line 44, in <module>
(nova.root): TRACE: service.serve()
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/service.py", line 231, in serve
(nova.root): TRACE: x.start()
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/service.py", line 81, in start
(nova.root): TRACE: self.manager.init_host()
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/network/manager.py", line 467, in init_host
(nova.root): TRACE: super(VlanManager, self).init_host()
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/network/manager.py", line 125, in init_host
(nova.root): TRACE: self._on_set_network_host(ctxt, network['id'])
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/network/manager.py", line 568, in _on_set_network_host
(nova.root): TRACE: network_ref)
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/network/linux_net.py", line 169, in ensure_vlan_bridge
(nova.root): TRACE: interface = ensure_vlan(vlan_num)
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/network/linux_net.py", line 178, in ensure_vlan
(nova.root): TRACE: _execute("sudo vconfig set_name_type VLAN_PLUS_VID_NO_PAD")
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/network/linux_net.py", line 327, in _execute
(nova.root): TRACE: return utils.execute(cmd, *args, **kwargs)
(nova.root): TRACE: File "/usr/lib/pymodules/python2.6/nova/utils.py", line 147, in execute
(nova.root): TRACE: cmd=cmd)
(nova.root): TRACE: ProcessExecutionError: Unexpected error while running command.
(nova.root): TRACE: Command: sudo vconfig set_name_type VLAN_PLUS_VID_NO_PAD
(nova.root): TRACE: Exit code: 1
(nova.root): TRACE: Stdout: ''
(nova.root): TRACE: Stderr: 'sudo: no tty present and no askpass program specified\n'