fixes jaegertracing#1568

if spec.IngressClassName is not specified in CRD, then this will query kubernetes API for getting list of IngressClasses and look for if any default IngressClass is available, if present the it attach that IngressClass to networkingv1.IngressSpec of jaegerIngress and if not available then it check for nginx ingress controller and attach that and if nothing is avalable then it do nothing.

Signed-off-by: Gaurav Singh <gauravsinghbr@hotmail.com>

config/rbac/role.yaml

@@ -221,6 +221,7 @@ rules:
 - apiGroups:
   - networking.k8s.io
   resources:
+  - ingressclasses
   - ingresses
   verbs:
   - create

controllers/jaegertracing/jaeger_controller.go

@@ -48,7 +48,7 @@ func NewReconciler(client client.Client, clientReader client.Reader, scheme *run
 // +kubebuilder:rbac:groups=apps,resources=deployments;daemonsets;replicasets;statefulsets,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=extensions,resources=ingresses,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=autoscaling,resources=horizontalpodautoscalers,verbs=get;list;watch;create;update;patch;delete
-// +kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses,verbs=get;list;watch;create;update;patch;delete
+// +kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses;ingressclasses,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=route.openshift.io,resources=routes,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=console.openshift.io,resources=consolelinks,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=batch,resources=jobs;cronjobs,verbs=get;list;watch;create;update;patch;delete

pkg/ingress/query.go

@@ -1,10 +1,12 @@
 package ingress
 
 import (
+	"context"
 	"fmt"
-
 	networkingv1 "k8s.io/api/networking/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
 
 	v1 "github.com/jaegertracing/jaeger-operator/apis/v1"
 	"github.com/jaegertracing/jaeger-operator/pkg/service"
@@ -52,6 +54,38 @@ func (i *QueryIngress) Get() *networkingv1.Ingress {
 
 	if i.jaeger.Spec.Ingress.IngressClassName != nil {
 		spec.IngressClassName = i.jaeger.Spec.Ingress.IngressClassName
+	} else {
+		class := ""
+		nginxIngressAvailable := false
+		config, err := rest.InClusterConfig()
+		if err == nil {
+			clientSet, err := kubernetes.NewForConfig(config)
+			if err == nil {
+				ingressList, err := clientSet.NetworkingV1().IngressClasses().List(context.Background(), metav1.ListOptions{})
+				if err == nil {
+					for _, ingress := range ingressList.Items {
+						if ingress.Name == "nginx" {
+							nginxIngressAvailable = true
+						}
+						for k, v := range ingress.Annotations {
+							if k == "ingressclass.kubernetes.io/is-default-class" {
+								if v == "true" {
+									class = ingress.Name
+									break
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+
+		if len(class) > 0 {
+			spec.IngressClassName = &class
+		} else if nginxIngressAvailable {
+			class = "nginx"
+			spec.IngressClassName = &class
+		}
 	}
 
 	return &networkingv1.Ingress{