Support operator watch specify namespace (#180)

Author: drivebyer

main.go

@@ -61,6 +61,8 @@ func main() {
 	var metricsAddr string
 	var enableLeaderElection bool
 	var probeAddr string
+	var watchNamespace string
+	flag.StringVar(&watchNamespace, "watch-namespace", os.Getenv("WATCH_NAMESPACE"), "The namespace to watch, if not specified, all namespaces will be watched")
 	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8383", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
@@ -81,6 +83,7 @@ func main() {
 		HealthProbeBindAddress: probeAddr,
 		LeaderElection:         enableLeaderElection,
 		LeaderElectionID:       "2516c052.apache.org",
+		Namespace:              watchNamespace,
 	})
 	if err != nil {
 		setupLog.Error(err, "unable to start manager")