feat(options): allow disabling GoBGP grpc port

Author: aauren

docs/user-guide.md

@@ -86,7 +86,7 @@ Usage of kube-router:
       --enable-pod-egress                             SNAT traffic from Pods to destinations outside the cluster. (default true)
       --enable-pprof                                  Enables pprof for debugging performance and memory leak issues.
       --excluded-cidrs strings                        Excluded CIDRs are used to exclude IPVS rules from deletion.
-      --gobgp-admin-port uint16                       Port to connect to GoBGP for administrative purposes. (default 50051)
+      --gobgp-admin-port uint16                       Port to connect to GoBGP for administrative purposes. Setting this to 0 will disable the GoBGP gRPC server. (default 50051)
       --hairpin-mode                                  Add iptables rules for every Service Endpoint to support hairpin traffic.
       --health-port uint16                            Health check port, 0 = Disabled (default 20244)
   -h, --help                                          Print usage information.

pkg/controllers/routing/network_routes_controller.go

@@ -1015,7 +1015,7 @@ func (nrc *NetworkRoutingController) startBgpServer(grpcServer bool) error {
 		}
 	}
 
-	if grpcServer {
+	if grpcServer && nrc.goBGPAdminPort != 0 {
 		nrc.bgpServer = gobgp.NewBgpServer(
 			gobgp.GrpcListenAddress(net.JoinHostPort(nrc.krNode.GetPrimaryNodeIP().String(),
 				strconv.FormatUint(uint64(nrc.goBGPAdminPort), 10)) + "," +

pkg/options/options.go

@@ -167,7 +167,7 @@ func (s *KubeRouterConfig) AddFlags(fs *pflag.FlagSet) {
 	fs.BoolVar(&s.GlobalHairpinMode, "hairpin-mode", false,
 		"Add iptables rules for every Service Endpoint to support hairpin traffic.")
 	fs.Uint16Var(&s.GoBGPAdminPort, "gobgp-admin-port", defaultGoBGPAdminPort,
-		"Port to connect to GoBGP for administrative purposes.")
+		"Port to connect to GoBGP for administrative purposes. Setting this to 0 will disable the GoBGP gRPC server.")
 	fs.Uint16Var(&s.HealthPort, "health-port", defaultHealthCheckPort, "Health check port, 0 = Disabled")
 	fs.BoolVarP(&s.HelpRequested, "help", "h", false,
 		"Print usage information.")