Kubernetes Nginx Ingress not finding service endpoint

Question

I\'m having some trouble getting the Nginx ingress controller working in my Kubernetes cluster. I have created the nginx-ingress deployments, services, roles, etc., according to

Answer 1

Another situation when it may happen is when ingress class of the ingress controller does not match ingress class in the ingress resource manifest used for your services.

Nginx installation command, short example:

  helm install stable/nginx-ingress \
  --name ${INGRESS_RELEASE_NAME} \
  --namespace ${K8S_NAMESPACE} \
  --set controller.scope.enabled=true \
  --set controller.scope.namespace=${K8S_NAMESPACE} \
  --set controller.ingressClass=${NGINX_INGRESS_CLASS}

ingress resource spec. , excerpt:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  labels:
  annotations:
    # folowing line is not valid for K8s or Helm, 
    # but reflects the values must be the same
    kubernetes.io/ingress.class: ${NGINX_INGRESS_CLASS}

Answer 2

I discovered what I was doing wrong. In my application definition I was using name as my selector

  selector:
    matchLabels:
      name: hello-world
  template:
    metadata:
      labels:
        name: hello-world

Whereas in my service I was using app

  selector:
    app: hello-world

After updating my service to use app, it worked

  selector:
    matchLabels:
      app: hello-world
  template:
    metadata:
      labels:
        app: hello-world