Open Stack

when I use "sg libvirtd /data/stack/nova/bin/nova-compute &"

it show:

stack at n-cpu-1:~/nova$ 2012-03-05 13:47:56 CRITICAL nova [-] Unknown
connection type "None"
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE: File "/data/stack/nova/bin/nova-compute", line 47, in
<module>
(nova): TRACE: server = service.Service.create(binary='nova-compute')
(nova): TRACE: File "/data/stack/nova/nova/service.py", line 241, in create
(nova): TRACE: report_interval, periodic_interval)
(nova): TRACE: File "/data/stack/nova/nova/service.py", line 150, in
__init__
(nova): TRACE: self.manager = manager_class(host=self.host, *args, **kwargs)
(nova): TRACE: File "/data/stack/nova/nova/compute/manager.py", line 198,
in __init__
(nova): TRACE: utils.import_object(compute_driver),
(nova): TRACE: File "/data/stack/nova/nova/utils.py", line 87, in
import_object
(nova): TRACE: return cls()
(nova): TRACE: File "/data/stack/nova/nova/virt/connection.py", line 82, in
get_connection
(nova): TRACE: raise Exception('Unknown connection type "%s"' % t)
(nova): TRACE: Exception: Unknown connection type "None"
(nova): TRACE:


how can fix it?

-- 
非淡薄无以明志，非宁静无以致远
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