lab 11.2 ingress balancing and not routing based on host header

dsfraser · June 23

I've got an issue where after i've setup lab 11.2 ingress with two nginx pods and the corresponding ingress controllers and ingress rules etc. despite curling to load-balancer IP using the host header, they traffic is always balanced between the two, the host header seems to be ignored.

kubectl get pods NAME READY STATUS RESTARTS AGE myingress-ingress-nginx-controller-2jwkw 2/2 Running 281 (3d23h ago) 5d myingress-ingress-nginx-controller-bjbh9 2/2 Running 0 3d23h nfs-subdir-external-provisioner-6b958d8dd5-fqt4z 1/1 Running 16 (3d23h ago) 68d web-one-6bd47f96d7-5przs 1/1 Running 0 5d2h web-two-6bd47f96d7-4bchp 1/1 Running 1 (3d23h ago) 5d2h

kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 84d myingress-ingress-nginx-controller LoadBalancer 10.100.109.123 <pending> 80:31751/TCP,443:31047/TCP 10d myingress-ingress-nginx-controller-admission ClusterIP 10.97.128.57 <none> 443/TCP 10d web-one ClusterIP 10.102.13.165 <none> 80/TCP 72m web-two ClusterIP 10.104.211.198 <none> 80/TCP 71

kubectl get ingress -o yaml
apiVersion: v1
items:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/service-upstream: "true"
creationTimestamp: "2025-06-18T20:01:34Z"
generation: 2
name: ingress-test
namespace: default
resourceVersion: "5609621"
uid: d48f43a7-097b-41cb-ba4d-742f880649bc
spec:
ingressClassName: nginx
rules:
- host: www.internal.com
  http:
  paths:
  - backend:
    service:
    name: web-two
    port:
    number: 80
    path: /
    pathType: ImplementationSpecific
- host: www.external.com
  http:
  paths:
  - backend:
    service:
    name: web-one
    port:
    number: 80
    path: /
    pathType: ImplementationSpecific
    status:
    loadBalancer: {}
    kind: List
    metadata:
    resourceVersion: ""

chrispokorni · June 24

Hi @dsfraser,

Are the two applications web-one and web-two distinct? Do they return different content when accessed individually, and you can tell for sure which application was accessed based on its returned response?

Regards,
-Chris

dsfraser · June 24

Thanks for the reply chris, they are both nginx web servers and as per the instructions I have adjusted the index.html file to state either EXTERNAL or INTERNAL, but what happens is if I curl to external for example I get both INTERNAL And EXTERNAL output, it's like it's ignoring the host header and just balancing.

root@master1:~# curl -H "Host: www.external.com" http://10.100.109.123
<!DOCTYPE html>

Welcome to INTERNAL!

root@master1:~# curl -H "Host: www.external.com" http://10.100.109.123
<!DOCTYPE html>

Welcome to EXTERNAL!

-Sam Fraser

chrispokorni · June 28

Hi @dsfraser,

Please provide the outputs for the following commands, using the code formatting for readability:

kubectl get pod,svc,ep -o wide
kubectl get ingress
kubectl describe ingress ingress-test

Regards,
-Chris

lab 11.2 ingress balancing and not routing based on host header

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