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.
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 <!--NeedCopy-->
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
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 a 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.