example

example

This is an example application that has multiple controllers/control loops. It watches a custom resource named Foo and prints the object.

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: foos.example.com
spec:
  group: example.com
  version: v1
  names:
    kind: Foo
    plural: foos
  scope: Namespaced

The example application includes two controllers, "foo" and "bar". Each print changes to the Foo objects and run in parallel.

Each Foo object looks something like this:

apiVersion: example.com/v1
kind: Foo
metadata:
  name: example
spec:
  foo: "foo"
  bar: "bar"

The example application uses the controllerutil package to create and manage controllers and informers.

	m := controllerutil.NewControllerManager("foo-controller", client)

	// Register the foo controller.
	m.Register("foo", func(ctx *controller.Context) controller.Interface {
		return foo.New(
			"foo",
			ctx.Client,
			fooclient,
			ctx.SharedInformers.InformerFor(
				&examplev1.Foo{},
				func() cache.SharedIndexInformer {
					return fooinformers.NewFooInformer(
						fooclient,
						*namespace,
						*defaultResync,
						cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
					)
				},
			),
			ctx.Recorder,
			ctx.Logger,
		)
	})

Building

Build by running in the current directory.

go build