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metadata_host and metadata_listen

We have both parameters in nova.conf (metadata_host and metadata_listen). As per documentation, I dont see any difference between both. But still "metadata_listen" is set to metadata API server and metadata_listen is set to Similar observation for metadata_listen_port and metadata_port.

what do we need to set for above 4 parameters in nova.conf in Controller node and Compute node? I am running metadata server in controller node. When I launch an instance, I am getting error like "Could not retrieve public key from instance metadata" in the console log of the instance. Password authentication works. Can someone throw some light on this?

Thanks, Mani