Ingress cannot find the my app

[vahidazad]

Hi
I am new to Kubernetes.

my setup:

• nginx deployment as an app
• nginx service
• nginx ingress controller
• myapp ingress rule

deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80

nginx service

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
    - protocol: TCP
      port: 8080
      targetPort: 80

My app Ingress

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myapp-ingress
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: example.com
    http:
      paths:
      - path: /
        pathType: Exact
        backend:
          service:
            name: nginx-service
            port:
              number: 8080

Services:

k get svc
NAME                                 TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx-controller             LoadBalancer   10.106.160.11    <pending>     80:32189/TCP,443:31960/TCP   30h
ingress-nginx-controller-admission   ClusterIP      10.97.119.19     <none>        443/TCP                      30h
kubernetes                           ClusterIP      10.96.0.1        <none>        443/TCP                      2d21h
nginx-service                        ClusterIP      10.105.137.251   <none>        8080/TCP                     21m

ingress

k get ingress
NAME            CLASS    HOSTS         ADDRESS   PORTS   AGE
myapp-ingress   <none>   example.com             80      30m

Pods

k get pods
NAME                                        READY   STATUS    RESTARTS        AGE
ingress-nginx-controller-5c6fd54c59-t5k6f   1/1     Running   1 (8m32s ago)   30h
nginx-deployment-7f456874f4-6hhqh           1/1     Running   1 (6m54s ago)   2d7h

I configured "example.com" internally on my pc pointing to the worker node IP of my cluster.

ping example.com

Pinging example.com [192.168.0.8] with 32 bytes of data:
Reply from 192.168.0.8: bytes=32 time=4ms TTL=64
Reply from 192.168.0.8: bytes=32 time=3ms TTL=64
Reply from 192.168.0.8: bytes=32 time=4ms TTL=64

But I don't get any response when using the domain name in the URL. any help is appreciated.

However, I get a "Welcome to nginx!" when I use the NodePort directly: http://example.com:30000/

nginx-service NodePort 10.105.137.251 <none> 8080:30000/TCP 26m

[brianehlert]

From your service names I suspect you might be using the Kubernetes Community ingress controller which uses NGINX under the hood as the proxy. That project can be found here: https://github.com/kubernetes/ingress-nginx/ and is commonly also called "ingress-nginx"

This project is maintained by NGINX and is contained in the repository here.
I mention that because annotations are unique to projects.

[vahidazad]

Hi
I found my issue and fixed it. The issue was in the reverse proxy configuration where I missed passing the hostname to the ingress controller in Kubernetes.
I am using an Nginx reverse proxy in front of my Kubernetes cluster.
The traffic was forwarded to the ingress controller in Kubernetes, but the host header was missing, so the ingress controller could not match the hostname that was configured in the ingress yaml file.

I add the following line after the proxy_path: proxy_set_header Host $host;
and everything works fine now.