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Hi Bill,

Generally speaking, you'd only create a endpoints for any separate instances running the nova-api services. Many deployments run multiple of these (for fault tolerance and redundancy) behind a load balancer (such as an F5 or HAproxy) and define only a single endpoint at the load balancer's relevant IP address/hostname.

The current run of OpenStack clients are not very intelligent, and generally only look for the first publicURL endpoint they can find to interact with the service at hand, so I'd generally recommend this setup with the Essex release.