Add annotation to skip ingress rule

controllers/nginx/utils.go

@@ -26,6 +26,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	apierrs "k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/apis/extensions"
 	"k8s.io/kubernetes/pkg/client/cache"
 	"k8s.io/kubernetes/pkg/client/unversioned"
 	"k8s.io/kubernetes/pkg/util/wait"
@@ -246,3 +247,29 @@ func waitForPodCondition(kubeClient *unversioned.Client, ns, podName string, con
 		return false, nil
 	})
 }
+
+// ingAnnotations represents Ingress annotations.
+type ingAnnotations map[string]string
+
+const (
+	// ingressClassKey picks a specific "class" for the Ingress. The controller
+	// only processes Ingresses with this annotation either unset, or set
+	// to either nginxIngressClass or the empty string.
+	ingressClassKey   = "kubernetes.io/ingress.class"
+	nginxIngressClass = "nginx"
+)
+
+func (ing ingAnnotations) ingressClass() string {
+	val, ok := ing[ingressClassKey]
+	if !ok {
+		return ""
+	}
+	return val
+}
+
+// isNGINXIngress returns true if the given Ingress either doesn't specify the
+// ingress.class annotation, or it's set to "nginx".
+func isNGINXIngress(ing *extensions.Ingress) bool {
+	class := ingAnnotations(ing.ObjectMeta.Annotations).ingressClass()
+	return class == "" || class == nginxIngressClass
+}