Remove retries to ExternalName (#4584)

build/cover.sh

@@ -28,7 +28,7 @@ if [ -z "${PKG}" ]; then
 fi
 
 export CGO_ENABLED=1
-export GODEBUG=netdns=go+2
+export GODEBUG=netdns=cgo+2
 # use vendor directory instead of go modules https://github.com/golang/go/wiki/Modules
 export GO111MODULE=off
 

build/test.sh

@@ -30,7 +30,7 @@ fi
 
 # enabled to use host dns resolver
 export CGO_ENABLED=1
-export GODEBUG=netdns=go+2
+export GODEBUG=netdns=cgo+2
 # use vendor directory instead of go modules https://github.com/golang/go/wiki/Modules
 export GO111MODULE=off
 

internal/ingress/controller/endpoints.go

@@ -21,9 +21,7 @@ import (
 	"net"
 	"reflect"
 	"strconv"
-	"time"
 
-	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/klog"
 
 	corev1 "k8s.io/api/core/v1"
@@ -60,26 +58,9 @@ func getEndpoints(s *corev1.Service, port *corev1.ServicePort, proto corev1.Prot
 
 		// if the externalName is not an IP address we need to validate is a valid FQDN
 		if net.ParseIP(s.Spec.ExternalName) == nil {
-			defaultRetry := wait.Backoff{
-				Steps:    2,
-				Duration: 1 * time.Second,
-				Factor:   1.5,
-				Jitter:   0.2,
-			}
-
-			var lastErr error
-			err := wait.ExponentialBackoff(defaultRetry, func() (bool, error) {
-				_, err := net.LookupHost(s.Spec.ExternalName)
-				if err == nil {
-					return true, nil
-				}
-
-				lastErr = err
-				return false, nil
-			})
-
+			_, err := net.LookupHost(s.Spec.ExternalName)
 			if err != nil {
-				klog.Errorf("Error resolving host %q: %v", s.Spec.ExternalName, lastErr)
+				klog.Errorf("Error resolving host %q: %v", s.Spec.ExternalName, err)
 				return upsServers
 			}
 		}

internal/ingress/controller/endpoints_test.go

@@ -83,11 +83,11 @@ func TestGetEndpoints(t *testing.T) {
 			&corev1.Service{
 				Spec: corev1.ServiceSpec{
 					Type:         corev1.ServiceTypeExternalName,
-					ExternalName: "www.10.0.0.1.xip.io",
+					ExternalName: "www.google.com",
 					Ports: []corev1.ServicePort{
 						{
 							Name:       "default",
-							TargetPort: intstr.FromInt(80),
+							TargetPort: intstr.FromInt(443),
 						},
 					},
 				},
@@ -102,13 +102,13 @@ func TestGetEndpoints(t *testing.T) {
 			},
 			[]ingress.Endpoint{
 				{
-					Address: "www.10.0.0.1.xip.io",
-					Port:    "80",
+					Address: "www.google.com",
+					Port:    "443",
 				},
 			},
 		},
 		{
-			"a service type ServiceTypeExternalName with an invalid ExternalName value should return one endpoint",
+			"a service type ServiceTypeExternalName with an invalid ExternalName value should no return endpoints",
 			&corev1.Service{
 				Spec: corev1.ServiceSpec{
 					Type:         corev1.ServiceTypeExternalName,