Adding support for Traefik to respect the K8s ingress class annotation (#1182)

provider/kubernetes.go

@@ -116,6 +116,12 @@ func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configur
 		map[string]*types.Frontend{},
 	}
 	for _, i := range ingresses {
+		ingressClass := i.Annotations["kubernetes.io/ingress.class"]
+
+		if !shouldProcessIngress(ingressClass) {
+			continue
+		}
+
 		for _, r := range i.Spec.Rules {
 			if r.HTTP == nil {
 				log.Warnf("Error in ingress: HTTP is nil")
@@ -281,6 +287,15 @@ func equalPorts(servicePort v1.ServicePort, ingressPort intstr.IntOrString) bool
 	return false
 }
 
+func shouldProcessIngress(ingressClass string) bool {
+	switch ingressClass {
+	case "", "traefik":
+		return true
+	default:
+		return false
+	}
+}
+
 func (provider *Kubernetes) getPassHostHeader() bool {
 	if provider.DisablePassHostHeaders {
 		return false

provider/kubernetes_test.go

@@ -1492,6 +1492,7 @@ func TestIngressAnnotations(t *testing.T) {
 			ObjectMeta: v1.ObjectMeta{
 				Namespace: "testing",
 				Annotations: map[string]string{
+					"kubernetes.io/ingress.class":     "traefik",
 					"traefik.frontend.passHostHeader": "true",
 				},
 			},
@@ -1516,6 +1517,34 @@ func TestIngressAnnotations(t *testing.T) {
 				},
 			},
 		},
+		{
+			ObjectMeta: v1.ObjectMeta{
+				Namespace: "testing",
+				Annotations: map[string]string{
+					"kubernetes.io/ingress.class": "somethingOtherThanTraefik",
+				},
+			},
+			Spec: v1beta1.IngressSpec{
+				Rules: []v1beta1.IngressRule{
+					{
+						Host: "herp",
+						IngressRuleValue: v1beta1.IngressRuleValue{
+							HTTP: &v1beta1.HTTPIngressRuleValue{
+								Paths: []v1beta1.HTTPIngressPath{
+									{
+										Path: "/derp",
+										Backend: v1beta1.IngressBackend{
+											ServiceName: "service2",
+											ServicePort: intstr.FromInt(80),
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
 	}
 	services := []*v1.Service{
 		{