# Prepares the machine for serving a control plane
	kubeadm join phase control-plane-prepare all
`)

// NewControlPlanePreparePhase creates a kubeadm workflow phase that implements the preparation of the node to serve a control plane
func NewControlPlanePreparePhase() workflow.Phase {
	return workflow.Phase{
		Name:    "control-plane-prepare",
		Short:   "Prepare the machine for serving a control plane",
		Example: controlPlanePrepareExample,

                                        <la:errors property="doc.url"/>
                                        <la:text styleId="doc.url"
                                                 property="doc.url" styleClass="form-control"
                                                 required="required" data-validation="required"/>
                                    </div>
                                </div>

                                    <div class="col-sm-9">
                                        <la:errors property="name"/>
                                        <la:text styleId="name" property="name" styleClass="form-control"/>
                                    </div>
                                </div>
                                <div class="form-group row">

    val headers =
      Headers.headersOf(
        "cache-control",
        "no-store",
        "Cache-Control",
        "no-cache",
      )
    val headerMap = headers.toMultimap()
    assertThat(headerMap["cache-control"]!!.size).isEqualTo(2)
    assertThat(headerMap["Cache-Control"]!!.size).isEqualTo(2)
  }

                                        <la:errors property="appValue"/>
                                        <la:textarea styleId="appValue" property="appValue"
                                                     styleClass="form-control"/>
                                    </div>
                                </div>
                                <div class="form-group row">

input (control and non-control) is dead, all the outputs (control and
non-control) are dead as well. For `tf_executor.Merge`, the output is dead only
when either an input control token is dead or all of the regular inputs are
dead. For `tf_executor.ControlTrigger`, a live control output is always produced
even when some control inputs are dead.

### `tf_executor.graph` Operation

    tf_executor.graph {
      %control = tf_executor.island {
        "tf.StatefulPartitionedCall"(%arg0) <{config = "", config_proto = "", executor_type = "", f = @partitioned}> : (tensor<*x!tf_type.resource>) -> ()
        tf_executor.yield
      }
      tf_executor.fetch %control : !tf_executor.control
    }
    return
  }

)

// NewWaitControlPlanePhase is a hidden phase that runs after the control-plane and etcd phases
func NewWaitControlPlanePhase() workflow.Phase {
	phase := workflow.Phase{
		Name: "wait-control-plane",
		// TODO: remove this EXPERIMENTAL prefix once WaitForAllControlPlaneComponents goes GA:
		// https://github.com/kubernetes/kubeadm/issues/2907
		Short: "EXPERIMENTAL: Wait for the control plane to start",
		Run:   runWaitControlPlanePhase,
	}

  # (This is the usual way to get the control plane version with an out-of-cluster control plane.)
  istioctl x version --xds-address istio.cloudprovider.example.com:15012

  # Retrieve version information via Kubernetes config, using token security
  # (This is the usual way to get the control plane version with an in-cluster control plane.)
  istioctl x version

	control := NewStatefulPodControl(fakeClient, nil, claimLister, recorder)
	fakeClient.AddReactor("*", "*", func(action core.Action) (bool, runtime.Object, error) {
		t.Error("no-op update should not make any client invocation")
		return true, nil, apierrors.NewInternalError(errors.New("if we are here we have a problem"))
	})
	if err := control.UpdateStatefulPod(ctx, set, pod); err != nil {