Documentation
Traffic management
Request matching
Host

Host

Expose a route on multiple hosts.

For more information, see the Kubernetes Gateway API documentation.

Before you begin

  1. Follow the Get started guide to install kgateway.

  2. Follow the Sample app guide to create a gateway proxy with an HTTP listener and deploy the httpbin sample app.

  3. Get the external address of the gateway and save it in an environment variable. 

    export INGRESS_GW_ADDRESS=$(kubectl get svc -n kgateway-system http -o jsonpath="{.status.loadBalancer.ingress[0]['hostname','ip']}")
echo $INGRESS_GW_ADDRESS  
    kubectl port-forward deployment/http -n kgateway-system 8080:8080

Set up host matching

  1. Create an HTTPRoute that is exposed on two domains, host1.example and host2.example.

    kubectl apply -f- <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: httpbin-match
  namespace: httpbin
spec:
  parentRefs:
    - name: http
      namespace: kgateway-system
  hostnames:
    - host1.example
    - host2.example
  rules:
    - backendRefs:
        - name: httpbin
          port: 8000
EOF

  2. Send a request to the /status/200 path of the httpbin app on the host1.example domain. Verify that you get back a 200 HTTP response code.

    curl -vi http://$INGRESS_GW_ADDRESS:8080/status/200 -H "host: host1.example:8080"
    curl -vi localhost:8080/status/200 -H "host: host1.example"

    Example output:

    * Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< access-control-allow-credentials: true
access-control-allow-credentials: true
< access-control-allow-origin: *
access-control-allow-origin: *
< content-length: 0
content-length: 0
< x-envoy-upstream-service-time: 1
x-envoy-upstream-service-time: 1
< server: envoy
server: envoy

  3. Send another request to the httpbin app. This time, you send it along the host2.example domain. Verify that the request succeeds and that you also get back a 200 HTTP response code. 

    curl -vi http://$INGRESS_GW_ADDRESS:8080/status/200 -H "host: host2.example:8080"
    curl -vi localhost:8080/status/200 -H "host: host2.example"

    Example output:

    * Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< access-control-allow-credentials: true
access-control-allow-credentials: true
< access-control-allow-origin: *
access-control-allow-origin: *
< content-length: 0
content-length: 0
< x-envoy-upstream-service-time: 1
x-envoy-upstream-service-time: 1
< server: envoy
server: envoy

Cleanup

You can remove the resources that you created in this guide. 
kubectl delete httproute httpbin-match -n httpbin
HeaderHTTP method