Cannot access file inside Kubernetes cluster that has load balancer externally - kubernetes

Question

I have the cluster setup below in AKS
apiVersion: apps/v1
kind: Deployment
metadata:
name: hpa-example
spec:
replicas: 3
selector:
matchLabels:
app: hpa-example
template:
metadata:
labels:
app: hpa-example
spec:
containers:
- name: hpa-example
image: gcr.io/google_containers/hpa-example
ports:
- name: http-port
containerPort: 80
resources:
requests:
cpu: 200m
---
apiVersion: v1
kind: Service
metadata:
name: hpa-example
spec:
ports:
- port: 31001
nodePort: 31001
targetPort: http-port
protocol: TCP
selector:
app: hpa-example
type: NodePort
---
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
name: hpa-example-autoscaler
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: hpa-example
minReplicas: 1
maxReplicas: 10
targetCPUUtilizationPercentage: 50
The idea of this is to check AutoScaling
I need to have this available externally so I added
apiVersion: v1
kind: Service
metadata:
name: load-balancer-autoscaler
spec:
selector:
app: hpa-example
ports:
- port: 31001
targetPort: 31001
type: LoadBalancer
This now gives me an external IP however, I cannot connect to it in Postman or via a browser
What have I missed?
I have tried to change the ports between 80 and 31001 but that makes no difference

Answer 1

As posted by user #David Maze:
What's the exact URL you're trying to connect to? What error do you get? (On the load-balancer-autoscaler service, the targetPort needs to match the name or number of a ports: in the pod, or you could just change the hpa-example service to type: LoadBalancer.)
I reproduced your scenario and found out issue in your configuration that could deny your ability to connect to this Deployment.
From the perspective of Deployment and Service of type NodePort everything seems to work okay.
If it comes to the Service of type LoadBalancer on the other hand:
apiVersion: v1
kind: Service
metadata:
name: load-balancer-autoscaler
spec:
selector:
app: hpa-example
ports:
- port: 31001
targetPort: 31001 # <--- CULPRIT
type: LoadBalancer
This definition will send your traffic directly to the pods on port 31001 and it should send it to the port 80 (this is the port your app is responding on). You can change it either by:
targetPort: 80
targetPort: http-port
You could also change the Service of the NodePort (hpa-example) to LoadBalancer as pointed by user #David Maze!
After changing this definition you will be able to run:
$ kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
load-balancer-autoscaler LoadBalancer 10.4.32.146 AA.BB.CC.DD 31001:31497/TCP 9m41s
curl AA.BB.CC.DD:31001 and get the reply of OK!
I encourage you to look on the additional resources regarding Kubernetes services:
Docs.microsoft.com: AKS: Network: Services
Stackoverflow.com: Questions: Difference between nodePort and LoadBalancer service types
Kubernetes.io: Docs: Concepts: Service