Creating controller service for flow definitions

As you are building your data flow in your NiFi development environment, follow these steps to create a controller service:

Select your process group and click Configure from either the Operate Palette or the process group context menu of the NiFi UI.
The Process Group Configuration dialog is displayed.
Select the Controller Services tab.
Click the (+) button to add a new controller service.
The Add Controller Service dialog is displayed.
Select the required controller service and click Add.
Click the (Configure) icon in the right column and set the necessary options.
Click Apply to save the changes.
Click the (Flash) button to enable the controller service.

important
You must define the controller services for your data flow in the configuration of the process group where they will be used. This ensures that the controller services are included in the process group flow definition.