GKE ingress not routing based on host in the url

Question

I created the following ingress for my service on GKE (it's part of a helm chart with variables)

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: TestIngress
  annotations:
    kubernetes.io/ingress.class: "gce"
    kubernetes.io/ingress.global-static-ip-name: {{ $ingressExternalStaticIpName }}
spec:
  rules:
  - host: "web.frontend.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: {{ $webServiceName }}
            port:
              number: 80
  - host: "grpc.frontend.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: {{ $grpcServiceName }}
            port:
              number: 80
  defaultBackend:
    service:
      name: {{ $grpcServiceName }}
      port:
        number: 80

I modified the /etc/hosts to make web.frontend.com point to the static ip. then I ran

curl web.frontend.com

I realize the grpc service was responding to my request. I read this doc https://kubernetes.io/docs/concepts/services-networking/ingress/ and it saids it routes based on the Host header?? that sounds a bit weird since I assumed host meant the url. so I tried

curl -H "Host:web.frontend.com:80" web.frontend.com

and still got response from grpc server

How exactly does ingress host work, or am I doing something wrong?

Answer 1

Tried it the next day and it's working. The issue might be due to google caching