Enablg GoBGP logging from kube-router

Fixes #363

Documentation/README.md

@@ -108,6 +108,7 @@ Usage of kube-router:
       --cluster-asn uint                 ASN number under which cluster nodes will run iBGP.
       --cluster-cidr string              CIDR range of pods in the cluster. It is used to identify traffic originating from and destinated to pods.
       --config-sync-period duration      The delay between apiserver configuration synchronizations (e.g. '5s', '1m').  Must be greater than 0. (default 1m0s)
+      --enable-gobgp-logging             Set --enable-gobgp-logging=true to print GoBGP logs
       --enable-ibgp                      Enables peering with nodes with the same ASN, if disabled will only peer with external BGP peers (default true)
       --enable-overlay                   When enable-overlay set to true, IP-in-IP tunneling is used for pod-to-pod networking across nodes in different subnets. When set to false no tunneling is used and routing infrastrcture is expected to route traffic for pod-to-pod networking across nodes in different subnets (default true)
       --enable-pod-egress                SNAT traffic from Pods to destinations outside the cluster. (default true)

app/options/options.go

@@ -17,6 +17,7 @@ type KubeRouterConfig struct {
 	ClusterCIDR             string
 	ConfigSyncPeriod        time.Duration
 	EnableiBGP              bool
+	EnableGoBGPLogging      bool
 	EnableOverlay           bool
 	EnablePodEgress         bool
 	EnablePprof             bool
@@ -126,4 +127,5 @@ func (s *KubeRouterConfig) AddFlags(fs *pflag.FlagSet) {
 	// 	"Password that cluster-node BGP servers will use to authenticate one another when \"--nodes-full-mesh\" is set.")
 	fs.StringVarP(&s.VLevel, "v", "v", "0", "log level for V logs")
 	fs.Uint16Var(&s.HealthPort, "health-port", 20244, "Health check port, 0 = Disabled")
+	fs.BoolVar(&s.EnableGoBGPLogging, "enable-gobgp-logging", s.EnableGoBGPLogging, "Set --enable-gobgp-logging=true to print GoBGP logs")
 }

app/server.go

@@ -13,6 +13,7 @@ import (
 	"github.com/cloudnativelabs/kube-router/app/options"
 	"github.com/golang/glog"
 
+	log "github.com/sirupsen/logrus"
 	"k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
@@ -134,6 +135,14 @@ func (kr *KubeRouter) Run() error {
 	}
 
 	if kr.Config.RunRouter {
+
+		// enable GoBGP debug log
+		if kr.Config.EnableGoBGPLogging {
+			log.SetLevel(log.DebugLevel)
+		} else {
+			log.SetLevel(log.WarnLevel)
+		}
+
 		nrc, err := controllers.NewNetworkRoutingController(kr.Client, kr.Config, nodeInformer, svcInformer, epInformer)
 		if err != nil {
 			return errors.New("Failed to create network routing controller: " + err.Error())