Kubernetes host ingress with nested subdomains (GCP) - dns

Question

I am trying to setup a K8s deployment where ingress's controllers can define a service as a subdomain. i.e. app1 can define itself to get traffic from app1.sub.domain.io in its ingress config.
I have a DNS A Record *.sub.domain.io that points to a Load Balancer. That load balancer is pointing to the cluster's instance group.
So if I am right all traffic that goes to anything at sub.domain.io will land inside the cluster and just need to route said traffic.
Below are the k8 configs, which has a pod, a service and an ingress. The pods are healthy and working, I believe the service isn't required but will want other pods to talk to it via internal DNS so it's added.
The ingress rules have a host app1.sub.domain.io, so in theory, curl'ing app1.sub.domain.io should follow:
DNS -> Load Balancer -> Cluster -> Ingress Controller -> Pod
At the moment when I try to hit app1.sub.domain.io it just hangs. I have tried not having service, making external-name service and doesn't work.
I don't want to go down the route of using the loadBalancer ingress as that makes a new external IP that needs to be applied to DNS records manually, or with a nasty bash script that waits for services external IP and runs GCP command, and we don't want to do this for each service.
Ref links:https://kubernetes.io/docs/concepts/services-networking/ingress/#name-based-virtual-hosting
Deployment
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: app1
namespace: default
labels:
app: app1
spec:
replicas: 3
selector:
matchLabels:
app: app1
template:
metadata:
labels:
app: app1
spec:
containers:
- image: xxxx:latest
name: app1
ports:
- containerPort: 80
env:
- name: NODE_ENV
value: production
Service
---
kind: Service
apiVersion: v1
metadata:
name: app1
labels:
app: app1
spec:
ports:
- port: 80
targetPort: 80
selector:
app: app1
type: ClusterIP
Ingress
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: app1-ingress
labels:
app: app1
spec:
rules:
- host: app1.sub.domain.io
http:
paths:
- backend:
serviceName: app1
servicePort: 80
Once everything is deployed if you query
kubectl get pods,services,ingresses -l app=app1
NAME READY STATUS RESTARTS AGE
po/app1-6d4b9d8c5-4gcz5 1/1 Running 0 20m
po/app1-6d4b9d8c5-m4kwq 1/1 Running 0 20m
po/app1-6d4b9d8c5-rpm9l 1/1 Running 0 20m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/app1 ClusterIP x.x.x.x <none> 80/TCP 20m
NAME HOSTS ADDRESS PORTS AGE
ing/app1-ingress app1.sub.domain.io 80 20m
----------------------------------- Update -----------------------------------
Currently doing this, not ideal. Have global static IP that's assigned to a DNS record.
---
kind: Service
apiVersion: v1
metadata:
name: app1
labels:
app: app1
spec:
type: NodePort
selector:
app: app1
ports:
- port: 80
targetPort: 80
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: app1-ingress
annotations:
kubernetes.io/ingress.global-static-ip-name: app1-static-ip
labels:
app: app1-static-ip
spec:
backend:
serviceName: app1
servicePort: 80

Answer 1

*.sub.domain.io should point to the IP of the Ingress.
You can use a static IP for the Ingress by following the instructions in the tutorial here: https://cloud.google.com/kubernetes-engine/docs/tutorials/http-balancer#step_5_optional_configuring_a_static_ip_address

Answer 2

Try adding path to your Ingress:
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: app1-ingress
labels:
app: app1
spec:
rules:
- host: app1.sub.domain.io
http:
paths:
- backend:
serviceName: app1
servicePort: 80
path: /
If that doesn't work, please post the output of describe service and describe ingress.
Do you have an Ingress Controller?
Traffic should go LB-> Ingress Controller-> Ingress-> Service ClusterIP-> Pods