Knative service with Kong gateway and path based routing

Question

Let's say we have many microservices running on k8s with deployments, services and ingresses accessible with kong ingress gateway on api.localhost.

Each microservice run on specific path, e.g.

• api.localhost/foo for foo microservice
• api.localhost/bar for bar microservice

How to achieve this with Knative with Kong network layer? Something like this doesn't work:

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: foo-api  
  labels:
    networking.knative.dev/visibility: cluster-local
spec:
  template:    
    spec:
      containers:
        - image: foo-image
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:    
    kubernetes.io/ingress.class: kong
    konghq.com/strip-path: "true"
    ingress.kubernetes.io/service-upstream: "true"
  name: foo  
spec:
  rules:
    - host: api.localhost
      http:
        paths:
          - backend:
              service:
                name: foo-api
                port:
                  number: 80
            path: /foo
            pathType: ImplementationSpecific

https://github.com/Kong/kubernetes-ingress-controller/issues/584 https://knative.dev/docs/serving/samples/knative-routing-go/

Answer 1

I found this solution

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: knative-service-test
  namespace: default
spec:
  template:
    spec:
      containers:
        - image: ealen/echo-server:latest
---
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: request-transformer-example
  namespace: kong
plugin: request-transformer
config:
  replace:
    headers:
      - 'host:knative-service-test.default.example.com'
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: demo
  namespace: kong
  annotations:
    kubernetes.io/ingress.class: kong
    konghq.com/plugins: request-transformer-example
spec:
  rules:
  - http:
      paths:
      - path: /temp
        pathType: Prefix
        backend:
          service: 
            name: kong-proxy
            port: 80

https://github.com/Kong/kubernetes-ingress-controller/issues/706

But I need the correct host header in my service in a matter of multi-tenancy.