CODEWITHSUNDEEP
pythonflaskkuberneteskubernetes-ingress
EoinHanan
EoinHanan

Reputation: 77

How to get flask app accessible through ingress without setting rewrite-target

I have a Kubernetes cluster that is making use of an Ingress to forward on traffic to a frontend React app and a backend Flask app. My problem is that the React app only works if rewrite-target annotation is not set and the flask app only works if it is.

How can I get my flask app accessible without setting this value (commented out in below yaml).

Here is the Ingress controller:

metadata:
  name: thesis-ingress
  namespace: thesis
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/add-base-url: "true"
#    nginx.ingress.kubernetes.io/rewrite-target: /$1
    nginx.ingress.kubernetes.io/service-upstream: "true"
spec:
  tls:
    - hosts:
        - thesis
      secretName: ingress-tls
  rules:
    - host: thesis.info
      http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service:
              name: frontend
              port:
                number: 3000
        - path: /backend
          pathType: Prefix
          backend:
            service:
              name: backend
              port:
                number: 5000

Upvotes: 0

Views: 798

Answers (1)

mdaniel
mdaniel

Reputation: 33231

Your question didn't specify, but I'm guessing your capture group was to rewrite /backend/(.+) to /$1; on that assumption:

Be aware that annotations are per-Ingress, but all Ingress resources are unioned across the cluster to comprise the whole of the configuration. Thus, if you need one rewrite and one without, just create two Ingress resources

metadata:
  name: thesis-frontend
  namespace: thesis
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/add-base-url: "true"
    nginx.ingress.kubernetes.io/service-upstream: "true"
spec:
  tls:
    - hosts:
        - thesis
      secretName: ingress-tls
  rules:
    - host: thesis.info
      http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service:
              name: frontend
              port:
                number: 3000
---
metadata:
  name: thesis-backend
  namespace: thesis
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/add-base-url: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /$1
    nginx.ingress.kubernetes.io/service-upstream: "true"
spec:
  tls:
    - hosts:
        - thesis
      secretName: ingress-tls
  rules:
    - host: thesis.info
        - path: /backend/(.+)
          backend:
            service:
              name: backend
              port:
                number: 5000

Upvotes: 1

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