Nested components

Nesting a component within another component allows the nested component to create its configuration objects by referring to configuration objects or the context created by the parent component. The nested component can create one or more objects for each object created in the parent component. Nesting a component within another component does not indicate any relationship between the configuration objects created. Nesting is a way to facilitate the task of components to construct configuration objects within an existing context of the parent components.

Example:

components:

 -

  name: my-lbvserver-comp

  type: ns::lbvserver

   properties:

      name: $parameters.name + "-lb"

      servicetype: HTTP

      ipv46: $parameters.ip

      port: 80

      lbmethod: $parameters.lb-alg

      components:

        -

         name: my-svcg-comp

         type: ns::servicegroup

         properties:

            name: $parameters.name + "-svcgrp"

            servicetype: HTTP

         components:

            -

              name: lbvserver-svg-binding-comp

              type: ns::lbvserver\_servicegroup\_binding

              properties:

                name: $parent.parent.properties.name

                servicegroupname: $parent.properties.name

                  -

                    name: members-svcg-comp

                    type: ns::servicegroup\_servicegroupmember\_binding

                    repeat:

                      repeat-list: $parameters.svc-servers

                      repeat-item: srv

                    properties:

                      ip: $srv

                      port: str($parameters.svc-port)

                      servicegroupname: $parent.properties.name

In this example, multi-level nesting is used. The component my-lbvserver-comp has a child component called my-svcg-comp. And, the my-svcg-comp component has two child components within it. The my-svcg-comp component is used to create a service group configuration object on the NetScaler instance by providing values to the attributes of the built-in NITRO resource type “servicegroup.” The first child component of the my-svcg component, lbvserver-svg-binding-comp, is used to bind the service group created by its parent component to the load balancing virtual server (lbvserver) created by the parent’s parent component. The $parent notation, also called the parent reference, is used to refer to entities in the parent components. The second child component, members-svcg-comp, is used to bind the list of services to the service group created by the parent component. The binding is achieved by using the repeat construct of StyleBook to iterate over the list of services specified for the parameter svc-servers. For information on repeat constructs, see Repeat Construct.

You can also create the same configuration objects without using nesting of components. For more information and examples, see StyleBook to Create a Basic Load Balancing Configuration.

Nested components

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