I've deployed few apps on Google Kubernetes Engine and exposed two controllers based on Flask Python, with Service which contains type: LoadBalancer.

apiVersion: v1
kind: Service
metadata:
  labels:
    app: my-app
  name: controller
  namespace: ns-app
spec:
  type: LoadBalancer
  ports:
  - name: "5001"
    port: 5001
    targetPort: 5001
  selector:
    app: my-app

When I send Http Request via Python/Postman/Curl sometimes the Controller response with 200 ok, But most of the time the request is being rejected immediately, without timeout or anything.

I had few speculation and thought that the load balancer reject the requests. Then I tried to use Ingress for expose the controller... using this tutorial

The example in the tutorial works like charm, but forcing it on my app is not working. I'd change the service type to NodePort

ingress.yaml:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: controller-ingress
  namespace: ns-app
spec:
  backend:
    serviceName: controller
    servicePort: 5001

service.yaml

apiVersion: v1
kind: Service
metadata:
  labels:
    app: my-app
  name: controller
  namespace: ns-app
spec:
  type: NodePort
  ports:
  - name: "5001"
    port: 5001
    targetPort: 5001
  selector:
    app: my-app

after waiting for ~15 minutes I entered to the Ingress external IP and I get default backend - 404.

Questions: 1. How can I solve it? 2. There is difference between LoadBalancer and NodePort+Ingress?

I need to expose my Flask Controller to have external IP in order to receive Http Requests.

Thank you