To add new hosts to your cluster, browse to the Hosts page and select +Add New Hosts, from the Actions menu. The Add Host Wizard provides a sequence of prompts similar to those in the Ambari Install Wizard. Follow the prompts, providing information simliar to that provided to define the first set of hosts in your cluster.
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To review the Ambari Install Wizard procedure, see Installing, Configuring, and Deploying the Cluster in the Ambari Installation Guide.