openstack trove fix issue

I have 2 servers, 1 Control, 1 Compute, the Volume is in Compute, I use iscsi to share it with the control, when I create Trove, nova-conductor reports an error, if the server's hard disk, memory, and CPU are sufficient, it will report an error,


build_instances: No valid host was found.
Traceback (most recent call last):

File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 241, in inner
return func(*args, **kwargs)

File "/usr/lib/python3.6/site-packages/nova/scheduler/manager.py", line 209, in select_destinations
raise exception.NoValidHost(reason="")

nova.exception.NoValidHost: No valid host was found.
: nova.exception_Remote.NoValidHost_Remote: No valid host was found.


I want to create Trove and Compute instance without error.