guide/blueprints/example_yaml/entity-config-catalog.yaml

brooklyn.catalog:
  items:
  - id: entity-config-example
    itemType: entity
    name: Entity Config Example
    item:
      type: org.apache.brooklyn.entity.software.base.VanillaSoftwareProcess
      brooklyn.parameters:
      - name: custom.message
        type: string
        description: Message to be displayed
        default: Hello
      brooklyn.config:
        shell.env:
          MESSAGE: $brooklyn:config("custom.message")
        launch.command: |
          echo "My example launch command: $MESSAGE"
        checkRunning.command: |
          echo "My example checkRunning command: $MESSAGE"