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OpenStack provides a feature called scheduler hints that allow a user to inform the scheduler where they desire their instance to run. 

Policies available to use:

Code Block
openstack server create --image IMAGE_ID --flavor 1 --hint group=SERVER_GROUP_UUID server-1

openstack server create --image IMAGE_ID \
  --flavor 1 --hint different_host=INSTANCE_ID_1 \
  --hint different_host=INSTANCE_ID_2 MY_THIRD_INSTANCE

More documentation on how to use these filters is available upstream at: