nginx ingress controller don't reach backend service?

Question

I am currently trying to expose an kubernetes service via an ingress controller, but I cannot seem to so? Who some odd reason does the host/path never resolve to the clusterIp and port that I want to use, eventhough this should have been resolved via my ingress controller and the ressource?...

apiVersion: v1
kind: Service
metadata:
  name: hello-kubernetes
spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: hello-kubernetes
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-kubernetes
spec:
  replicas: 3
  selector:
    matchLabels:
      app: hello-kubernetes
  template:
    metadata:
      labels:
        app: hello-kubernetes
    spec:
      containers:
      - name: hello-kubernetes
        image: paulbouwer/hello-kubernetes:1.5
        ports:
        - containerPort: 8080
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-ingress-controller-conf
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-ingress-controller
  namespace: default
spec:
  replicas: 1
  revisionHistoryLimit: 3
  template:
    metadata:
      labels:
        app: nginx-ingress-lb
    spec:
      terminationGracePeriodSeconds: 60
      serviceAccount: nginx
      containers:
        - name: nginx-ingress-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.9.0
          imagePullPolicy: Always
          readinessProbe:
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
          livenessProbe:
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            timeoutSeconds: 5
          args:
            - /nginx-ingress-controller
            - --default-backend-service=$(POD_NAMESPACE)/default-backend-service
            - --configmap=$(POD_NAMESPACE)/nginx-ingress-controller-conf
            - --v=2
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
          - name: http 
            containerPort: 80
          - name: https
            containerPort: 443
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-ingress
spec:
  type: NodePort
  ports:
    - port: 80
      targetPort: 80
      name: http
    - port: 443
      targetPort: 443
      name: https 
  selector:
    app: nginx-ingress
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nginx
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: nginx-role
rules:
- apiGroups:
  - ""
  resources:
  - configmaps
  - endpoints
  - nodes
  - pods
  - secrets
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - services
  verbs:
  - get
  - list
  - update
  - watch
- apiGroups:
  - extensions
  resources:
  - ingresses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - extensions
  resources:
  - ingresses/status
  verbs:
  - update
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: nginx-role
  namespace: default
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: nginx-role
subjects:
- kind: ServiceAccount
  name: nginx
  namespace: default
---
#Ingress ressource
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-hello
spec:
  rules:
  - host: dev.hello.com
    http:
      paths: 
      - backend:
          serviceName: hello-kubernetes
          servicePort: 80
---
##Default backend
apiVersion: v1
kind: Service
metadata:
  name: default-backend-service
  labels:
    app: default-backend
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: default-backend
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: default-backend
  labels:
    app: default-http-backend
spec:
  selector:
    matchLabels:
      app: default-backend  
  serviceName: default-backend-service
  replicas: 2
  template:
    metadata:
      labels:
        app: default-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-backend
        image: gcr.io/google_containers/defaultbackend:1.0
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 10m
            memory: 20Mi
          requests:
            cpu: 10m
            memory: 20Mi
---

I tried to make an MVP - but for some reason I can't resolve the path dev.hello.com I want to use that to tell the ingress which service I want to connect to... but for some reason this never resolves to an ip address - it does not seem to hit anything?

Why? Is this incorrectly setup?

Answer 1

The service for hello-kubernetes should not be of type LoadBalancer because you want the ingress to work as Loadbalancer. So change the service of hello-kubernetes to type ClusterIP .

apiVersion: v1
kind: Service
metadata:
  name: hello-kubernetes
spec:
  type: ClusterIP
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: hello-kubernetes

Answer 2

It's hard to understand what you exactly wants. You should be more precise what you exactly wants.

1. Ingress with ClusterIP.

Like Arghya Sadhu wrote, as you are using Ingress you don't need to specify LoadBalancer .

2. Ingress with NodePort

Keep in mind that you can also use NodePort with Ingress . Good explenation and example can be found here .

3. Ingress YAML As per official Kubernetes Docs minimal Ingress resources looks like:

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: test-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - http:
      paths:
      - path: /testpath
        backend:
          serviceName: test
          servicePort: 80

In your Ingress I couldn't find spec.rules.http.paths.path .

4. IP of LoadBalancer

Also very important is where are you have your cluster. If you are using On-Prem like GKE, AWS, AZURE, etc. your LoadBalancer will automatically get externalIP which allow you to connect to your cluster from outside. However, if you are using local machine you will need to use MetalLB .

In addition, please take a look at kubernetes docs about Connect a Front End to a Back End Using a Service .

Also please check this tutorial , it might help you.