ports:
        - containerPort: 80
        - containerPort: 443
        # we expose 8080 to access nginx stats in url /nginx-status
        # this is optional
        - containerPort: 8080
        volumeMounts:
        - mountPath: /etc/nginx-ssl/dhparam
          name: dhparam-secret
        args:
        - /nginx-ingress-controller
        - --default-backend-service=ingress-controller/default-http-backend

apiVersion: v1
kind: Service
metadata:
  name: nginx-controller
  namespace: ingress-controller
  labels:
    k8s-app: nginx-ingress-lb
spec:
  selector:
    k8s-app: nginx-ingress-lb
  ports:
  - name: http
    port: 80
    targetPort: 80
    nodePort: 80
    protocol: TCP
  - name: https
    port: 443
    targetPort: 443
    nodePort: 443
    protocol: TCP
  type: NodePort

upstream kube-preview-app {
  server preview.apps.svc.kubernetes.local:8081;
}

server {
  server_name preview.amplifr.com;
...
  location / {
...
    proxy_pass http://kube-preview-app;
  }
}