Watch Namespace (#454)

main.go

@@ -35,6 +35,8 @@ import (
 )
 
 var (
+	watchNamespace string
+
 	scheme   = runtime.NewScheme()
 	setupLog = ctrl.Log.WithName("setup")
 )
@@ -55,9 +57,20 @@ func main() {
 	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
 		"Enable leader election for controller manager. "+
 			"Enabling this will ensure there is only one active controller manager.")
+	flag.StringVar(
+		&watchNamespace,
+		"namespace",
+		"",
+		"Namespace that the controller watches to reconcile cluster-api objects. If unspecified, the controller watches for cluster-api objects across all namespaces.",
+	)
 	flag.Parse()
 
 	ctrl.SetLogger(zap.New(zap.UseDevMode(true)))
+
+	if watchNamespace != "" {
+		setupLog.Info("Watching cluster-api objects only in namespace for reconciliation", "namespace", watchNamespace)
+	}
+
 	syncPeriod := 15 * time.Second
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
 		Scheme:             scheme,
@@ -66,6 +79,7 @@ func main() {
 		LeaderElection:     enableLeaderElection,
 		LeaderElectionID:   "effcf9b8.cluster.x-k8s.io",
 		SyncPeriod:         &syncPeriod,
+		Namespace:          watchNamespace,
 	})
 	if err != nil {
 		setupLog.Error(err, "unable to start manager")