I'm trying to deploy a laravel application in kubernetes at Google Cloud Platform.

I followed couple of tutorials and was successful trying them locally on a docker VM.

https://learnk8s.io/blog/kubernetes-deploy-laravel-the-easy-way

https://blog.cloud66.com/deploying-your-laravel-php-applications-with-cloud-66/

But when tried to deploy in kubernetes using an ingress to assign a domain name to the application. I keep getting the 502 bad gateway page.

I'm using a nginx ingress controller with image k8s.gcr.io/nginx-ingress-controller:0.8.3 and my ingress is as following

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  tls:
  - hosts:
    - domainname.com
    secretName: sslcertificate
  rules:
  - host: domain.com
    http:
      paths:
      - backend:
          serviceName: service
          servicePort: 80
        path: /

this is my application service

apiVersion: v1
kind: Service
metadata:
  name: service
  labels:
    name: demo
    version: v1
spec:
  ports:
    - port: 80
      targetPort: 8080
      protocol: TCP
  selector:
    name: demo
  type: NodePort

this is my ingress controller

apiVersion: v1
kind: Service
metadata:
  name: default-http-backend
  labels:
    k8s-app: default-http-backend
spec:
  ports:
  - port: 80
    targetPort: 8080
    protocol: TCP
    name: http
  selector:
    k8s-app: default-http-backend
---
apiVersion: v1
kind: ReplicationController
metadata:
  name: default-http-backend
spec:
  replicas: 1
  selector:
    k8s-app: default-http-backend
  template:
    metadata:
      labels:
        k8s-app: default-http-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        # Any image is permissable as long as:
        # 1. It serves a 404 page at /
        # 2. It serves 200 on a /healthz endpoint
        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
---
apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx-ingress-controller
  labels:
    k8s-app: nginx-ingress-lb
spec:
  replicas: 1
  selector:
    k8s-app: nginx-ingress-lb
  template:
    metadata:
      labels:
        k8s-app: nginx-ingress-lb
        name: nginx-ingress-lb
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - image: gcr.io/google_containers/nginx-ingress-controller:0.8.3
        name: nginx-ingress-lb
        imagePullPolicy: Always
        readinessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
        livenessProbe:
          httpGet:
            path: /healthz
            port: 10254
            scheme: HTTP
          initialDelaySeconds: 10
          timeoutSeconds: 1
        # use downward API
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
            fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
        ports:
        - containerPort: 80
          hostPort: 80
        - containerPort: 443
          hostPort: 443
        # we expose 18080 to access nginx stats in url /nginx-status
        # this is optional
        - containerPort: 18080
          hostPort: 18080
        args:
        - /nginx-ingress-controller
        - --default-backend-service=$(POD_NAMESPACE)/default-http-backend

and here is my laravel application deployment

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: demo-rc
  labels:
    name: demo
    version: v1
spec:
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        name: demo
        version: v1
    spec:
      containers:
      - image: gcr.io/projectname/laravelapp:vx
        name: app-pod
        ports:
        - containerPort: 8080

I tried to add the domain entry to the hosts file but with no luck !! is there a specific configurations I have to add to the configmap.yaml file for the nginx ingress controller?