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# Add a KeyView Service

To use the KeyView processors you must configure a controller service for KeyView. The controller service stores configuration details for KeyView so that you only need to configure KeyView once, rather than for every KeyView processor.

To create the KeyView controller service

1. Click a blank area of the canvas, to de-select all of the components on the canvas.

2. In the Operate Palette, click Configuration .

   The NiFi Flow Configuration dialog box opens.

3. Click the Controller Services tab.

4. Click Create a new controller service .

   The Add Controller Service dialog box opens.

5. In the Source list, click idol.nifi.

6. In the list, click KeyViewFilterServiceImpl, and click ADD.

   The new service is added.

7. At the end of the row for the controller service, Configure .

   The Configure Controller Service dialog box opens.

8. Click the Properties tab.

   NiFi shows the list of properties for the KeyView service. The KeyView directory property sets the path to the directory that contains the KeyView filters. By default, this is set to the value of the `KEYVIEW_DIRECTORY` environment variable. You can either make sure that this variable has been set on your system, or edit the value and specify the path to your KeyView filters.

9. Click Apply.

   You are returned to the NiFi Flow Configuration dialog box.

10. Enable the service. At the end of the row for the controller service, click Enable .

    The Enable Controller Service dialog box opens.

11. Click ENABLE and then click CLOSE.
12. Close the NiFi Flow Configuration dialog box.

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