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Hi all,

i've a controller which is running all service and a secondary controller which is un multi_host so it's running compute network and api-metadata. From the dashboard i can successfully create snapshots of instances running on the controller but when i try to create a snapshot of an instance on a compute node i get in its logs:

==> /var/log/nova/nova-compute.log <==
2012-08-23 19:08:14 ERROR nova.rpc.amqp [req-66389a04-b071-4641-949b-3df04da85d08 a63f5293c5454a979bddff1415a216f6 e8c3367ff91d44b1ab1b14eb63f48bf7] Exception during message handling
2012-08-23 19:08:14 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 253, in _process_data
2012-08-23 19:08:14 TRACE nova.rpc.amqp     rval = node_func(context=ctxt, **node_args)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped
2012-08-23 19:08:14 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 183, in decorated_function
2012-08-23 19:08:14 TRACE nova.rpc.amqp     sys.exc_info())
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-08-23 19:08:14 TRACE nova.rpc.amqp     self.gen.next()
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 177, in decorated_function
2012-08-23 19:08:14 TRACE nova.rpc.amqp     return function(self, context, instance_uuid, *args, **kwargs)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 952, in snapshot_instance
2012-08-23 19:08:14 TRACE nova.rpc.amqp     self.driver.snapshot(context, instance_ref, image_id)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped
2012-08-23 19:08:14 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 714, in snapshot
2012-08-23 19:08:14 TRACE nova.rpc.amqp     image_file)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/image/glance.py", line 306, in update
2012-08-23 19:08:14 TRACE nova.rpc.amqp     _reraise_translated_image_exception(image_id)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/image/glance.py", line 304, in update
2012-08-23 19:08:14 TRACE nova.rpc.amqp     image_meta = client.update_image(image_id, image_meta, data)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/glance/client.py", line 195, in update_image
2012-08-23 19:08:14 TRACE nova.rpc.amqp     res = self.do_request("PUT", "/images/%s" % image_id, body, headers)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/glance/common/client.py", line 58, in wrapped
2012-08-23 19:08:14 TRACE nova.rpc.amqp     return func(self, *args, **kwargs)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/glance/common/client.py", line 420, in do_request
2012-08-23 19:08:14 TRACE nova.rpc.amqp     headers=headers)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/glance/common/client.py", line 75, in wrapped
2012-08-23 19:08:14 TRACE nova.rpc.amqp     return func(self, method, url, body, headers)
2012-08-23 19:08:14 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/glance/common/client.py", line 547, in _do_request
2012-08-23 19:08:14 TRACE nova.rpc.amqp     raise exception.Invalid(res.read())
2012-08-23 19:08:14 TRACE nova.rpc.amqp Invalid: Data supplied was not valid.
2012-08-23 19:08:14 TRACE nova.rpc.amqp Details: 400 Bad Request
2012-08-23 19:08:14 TRACE nova.rpc.amqp 
2012-08-23 19:08:14 TRACE nova.rpc.amqp The server could not comply with the request since it is either malformed or otherwise incorrect.
2012-08-23 19:08:14 TRACE nova.rpc.amqp 
2012-08-23 19:08:14 TRACE nova.rpc.amqp  Failed to update image metadata. Got error: Data supplied was not valid. Details: 400 Bad Request  The server could not comply with the request since it is either malformed or otherwise incorrect.   Failed to update image metadata. Got error: Data supplied was not valid. Details: Invalid container format 'None' for image.    
2012-08-23 19:08:14 TRACE nova.rpc.amqp

any idea?
Using nova create-image works but it creates a new image, not a snapshot (as the dashboard shows)

Best Regards

Alessandro