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A NuoDB domain is created when the first NuoDB host is provisioned. The domain can be scaled out by provisioning or adding additional hosts, scaled in by removing hosts.
For each host that will be added to the domain, perform the following steps:
nuoadmin.conffile which enable the host to securely peer into the domain.
nuoadmin.conf, see Configuring Admin Processes. For more information about peering, see About Admin Processes and Peering and Extending the Database Across a Second Host (Scaling Out).
For additional conceptual information about the domain, see About Domains.