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# IDOL Site Admin Architecture

IDOL Site Admin uses the following components to gather information about the IDOL services that it controls. You can view this information in the IDOL Site Admin web application user interface.

## Coordinator Server

The Coordinator server is the central point from which you can view the logs and monitor the status of your components, and manage any component. The Coordinator server connects to, and collects status information from, all available Controller servers.

For more information about how to configure Coordinator, refer to the Coordinator Reference.

## Controller Server

The Controller server performs the direct monitoring of IDOL services, and communicates with the Coordinator server. Each host that runs IDOL system components must contain a Controller server.

For more information about how to configure Controller, refer to the Controller Reference.

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