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# Discover Hosts Page

Coordinator uses Simple Service Discovery Protocol (SSDP) to locate Controller servers that are not part of a cluster, or group of services, in IDOL Site Admin. You can use the Discover Hosts page to add unregistered Controller servers to a cluster. This enables you to monitor and manage services on the same host as the Controller through the IDOL Site Admin interface.

To add a Controller to a cluster

- Click the green arrow to move an unregistered Controller from the Discovered Controllers panel to the Cluster panel, or drag the Controller across.

  Alternatively, you can manually specify the details for the Controller that you want to add, then click Add.

To remove a Controller from a cluster

- Click the red arrow to move a registered Controller server from the Cluster panel to the Discovered Controllers panel, or drag the Controller across.

After you add a Controller server to a cluster, you can click Services to register the individual services that run on the host that the Controller server monitors. See Discover Services for more information.

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