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No valid host was found.

When I create a instance of provider, the nova conductor logfile report the error as below: ( File "/usr/lib/python2.7/dist-packages/nova/scheduler/", line 104, in select_destinations dests = self.driver.select_destinations(ctxt, spec_obj)

File "/usr/lib/python2.7/dist-packages/nova/scheduler/", line 74, in select_destinations raise exception.NoValidHost(reason=reason)

NoValidHost: No valid host was found. There are not enough hosts available.)

I check with command : openstack compute service list, the result is ok as shown in example. but I found the table compute_nodes of database nova is empty, and I check the nova.conf many times, I can't find any erros. Thanks!