具有应用程序网关入口 controller 配置的 AKS

Question

I configured application gateway ingress controller for my Kube.netes cluster, but I can't access my pod container app named myapp running on port 8080/TCP.

I created a service that has the following configuration:

apiVersion: v1
kind: Service
metadata:
  name: myapp-service
spec:
  selector:
    app: myapp
  ports:
    - port: 8080
      name: myapp-api

and the ingress with the following configuration:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-resource
  annotations:
    kubernetes.io/ingress.class: azure/application-gateway
spec:
  rules:
  - http:
      paths:
      - backend:
          service:
            name: myapp-service
            port:
              number: 8080
        path: /
        pathType: Exact

but still every time I access the fronted IP of the application gateway, I get 502 Bad Gateway? Am I missing something?

Answer 1

Glad @ Razvan that you resolved the issue yourself. Posting your resolution as an answer to help other community members.

There can be many reasons for App Gateway 502 errors mainly if the backend health shows as unhealthy in Application Gateway.

That you resolved using the correct annotation which in turn returned the 404 Error . It is resolved by adding the following annotation to the ingress: appgw.ingress.kube.netes.io/health-probe-status-codes: "200 -399, 404 "

After adding the health probes , the backend service will become healthy .

There is a similar issue on Microsoft Q&A , where the 502 Bad Gateway error on Azure Applicate Gateway Ingress is solved by Ingress Annotations as well as the Probes Path correctly and also few reasons mentioned here which causes this error.