Kubernetes Ingress Route One Host

Question

In my Azure AKS cluster I was defined namespace dev with some services.My idea is connect to them from React static app under SSL.For this reason I maded Ingress controller with certificate manager. The controller was work properly but with one unexpected bug.I use my own domain with DNS Zone and records.The idea is when I go to qa.mysite.com , ingress must go to payment-svc "/api/health" and if /web go to web-svc "/".The problem is that when I use path Prefix with "/" the controller does not route to any related service.The route only happens when I use deafult prefix "/".The error is Not Found for Nginx or browser not found

    apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-portals
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt
spec:
  tls:
    - hosts:
      - qa.mysite.com # update IP address here
      secretName: app-web-cert
  rules:
  - host: qa.mysite.com # update IP address here
    http:
      paths:
      - path: /web  # I tried with a lot of services and prefixes but same result
        pathType: Prefix
        backend:
          service:
            name: webapp1-svc # After I tried with the same service payment-servive but not work on qa.mysite.com/web/api/health
            port: 
              number: 80
      - path: /  # The route works only here qa.mysite.com/api/health
        pathType: Prefix
        backend:
          service:
            name: payment-service
            port: 
              number: 80

• qa.mysite.com/api/healt works in this service I have endpoint /api/health

• qa.mysite.com/web or anything else /health qa.mysite.com/web/api/health .... did not

Answer 1

The path specified in the ingress is passed to the service in its entirety. So, your webapp1-svc should support endpoints starting /web. However, most likely you do not.

So, alternative is to rewrite the url when sending requests to webapp1-svc. Thus you have one ingress definition which sends requests to payment-service (and does not rewrite URLs).

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-portals-payments
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt
spec:
  tls:
    - hosts:
      - qa.mysite.com
      secretName: app-web-cert
  rules:
  - host: qa.mysite.com
    http:
      paths:
      - path: /  
        pathType: Prefix
        backend:
          service:
            name: payment-service
            port: 
              number: 80

And a second one which rewrites URLs to webapp1-svc. It will remove the preceding /web when sending requests to webapp1-svc.

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-portals-web
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /$2
    nginx.ingress.kubernetes.io/use-regex: "true"
    cert-manager.io/cluster-issuer: letsencrypt
spec:
  tls:
    - hosts:
      - qa.mysite.com 
      secretName: app-web-cert
  rules:
  - host: qa.mysite.com 
    http:
      paths:
      - path: /web(/|$)(.*)
        pathType: Prefix
        backend:
          service:
            name: webapp1-svc 
            port: 
              number: 80