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hi, all:
      i use FlatManger network mode , nova.conf :

      network_manager=nova.network.manager.FlatManager
      libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtBridgeDriver
      libvirt_vif_type=bridge

linuxnet_interface_driver=nova.network.linux_net.LinuxBridgeInterfaceDriver

     when i boot a vm , compute.log error :

     2012-07-25 18:29:20 ERROR nova.rpc.amqp
[req-f9962f9b-5889-48dd-9e51-7d60bb796313 18ed1f0eab03457cbc158cfe9dccc623
f5f58db68be24fc9a794ffe2c2081a77] Exception during message handling
2012-07-25 18:29:20 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/rpc/amqp.py", line 253, in
_process_data
2012-07-25 18:29:20 TRACE nova.rpc.amqp     rval = node_func(context=ctxt,
**node_args)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/exception.py", line 114, in wrapped
2012-07-25 18:29:20 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 183, in
decorated_function
2012-07-25 18:29:20 TRACE nova.rpc.amqp     sys.exc_info())
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-07-25 18:29:20 TRACE nova.rpc.amqp     self.gen.next()
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 177, in
decorated_function
2012-07-25 18:29:20 TRACE nova.rpc.amqp     return function(self, context,
instance_uuid, *args, **kwargs)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 657, in
run_instance
2012-07-25 18:29:20 TRACE nova.rpc.amqp     do_run_instance()
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/utils.py", line 946, in inner
2012-07-25 18:29:20 TRACE nova.rpc.amqp     retval = f(*args, **kwargs)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 656, in
do_run_instance
2012-07-25 18:29:20 TRACE nova.rpc.amqp     self._run_instance(context,
instance_uuid, **kwargs)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 457, in
_run_instance
2012-07-25 18:29:20 TRACE nova.rpc.amqp
self._set_instance_error_state(context, instance_uuid)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-07-25 18:29:20 TRACE nova.rpc.amqp     self.gen.next()
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 438, in
_run_instance
2012-07-25 18:29:20 TRACE nova.rpc.amqp
self._deallocate_network(context, instance)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-07-25 18:29:20 TRACE nova.rpc.amqp     self.gen.next()
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 435, in
_run_instance
2012-07-25 18:29:20 TRACE nova.rpc.amqp     injected_files, admin_password)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 598, in
_spawn
2012-07-25 18:29:20 TRACE nova.rpc.amqp
self._legacy_nw_info(network_info), block_device_info)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/exception.py", line 114, in wrapped
2012-07-25 18:29:20 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/virt/libvirt/connection.py", line
930, in spawn
2012-07-25 18:29:20 TRACE nova.rpc.amqp     self._create_new_domain(xml)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib/python2.6/site-packages/nova/virt/libvirt/connection.py", line
1597, in _create_new_domain
2012-07-25 18:29:20 TRACE nova.rpc.amqp
domain.createWithFlags(launch_flags)
2012-07-25 18:29:20 TRACE nova.rpc.amqp   File
"/usr/lib64/python2.6/site-packages/libvirt.py", line 650, in
createWithFlags
2012-07-25 18:29:20 TRACE nova.rpc.amqp     if ret == -1: raise
libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2012-07-25 18:29:20 TRACE nova.rpc.amqp libvirtError: Network filter not
found: Could not find filter 'nova-instance-instance-00000026-fa163e429b72'
2012-07-25 18:29:20 TRACE nova.rpc.amqp


help me ?
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