Configuration overview

In this guide you walk through a basic route delegation example that demonstrates route delegation between a parent HTTPRoute resource and two child HTTPRoute resources that forward traffic to an httpbin sample app. The following image illustrates the resulting route delegation hierarchy:

  • The parent HTTPRoute resource delegates traffic as follows:
    • /anything/team1 delegates traffic to the child HTTPRoute resource child-team1 in namespace team1.
    • /anything/team2 delegates traffic to the child HTTPRoute resource child-team2 in namespace team2.
  • The child HTTPRoute resource child-team1 matches incoming traffic for the /anything/team1/foo prefix path and routes that traffic to the httpbin app in namespace team1.
  • The child HTTPRoute resource child-team2 matches incoming traffic for the /anything/team2/bar exact prefix path and routes that traffic to the httpbin app in namespace team2.

Before you begin

  1. Create the namespaces for team1 and team2.

      kubectl create namespace team1
kubectl create namespace team2

  2. Deploy the httpbin app into both namespaces.

      kubectl -n team1 apply -f https://raw.githubusercontent.com/solo-io/gloo-mesh-use-cases/main/policy-demo/httpbin.yaml
kubectl -n team2 apply -f https://raw.githubusercontent.com/solo-io/gloo-mesh-use-cases/main/policy-demo/httpbin.yaml

  3. Verify that the httpbin apps are up and running.

      kubectl get pods -n team1
kubectl get pods -n team2

    Example output:

      NAME                      READY   STATUS    RESTARTS   AGE
httpbin-f46cc8b9b-bzl9z   3/3     Running   0          7s
NAME                      READY   STATUS    RESTARTS   AGE
httpbin-f46cc8b9b-nhtmg   3/3     Running   0          6s

Setup

  1. Create the parent HTTPRoute resource that matches incoming traffic on the delegation.example domain. The HTTPRoute resource specifies two routes:

    • /anything/team1: The routing decision is delegated to a child HTTPRoute resource in the team1 namespace.
    • /anything/team2: The routing decision is delegated to a child HTTPRoute resource in the team2 namespace.
      kubectl apply -f- <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: parent
  namespace: gloo-system
spec:
  hostnames:
  - delegation.example
  parentRefs:
  - name: http
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /anything/team1
    backendRefs:
    - group: gateway.networking.k8s.io
      kind: HTTPRoute
      name: "*"
      namespace: team1
  - matches:
    - path:
        type: PathPrefix
        value: /anything/team2
    backendRefs:
    - group: gateway.networking.k8s.io
      kind: HTTPRoute
      name: "*"
      namespace: team2
EOF

  2. Create the child HTTPRoute resource for the team1 namespace that matches traffic on the /anything/team1/foo prefix and routes traffic to the httpbin app in the team1 namespace. The child HTTPRoute resource does not select a specific parent HTTPRoute resource. Because of that, the child HTTPRoute resource is automatically selected by all parent HTTPRoute resources that delegate traffic to this child.

      kubectl apply -f- <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: child-team1
  namespace: team1
spec:
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /anything/team1/foo
    backendRefs:
    - name: httpbin
      port: 8000
EOF

  3. Create the child HTTPRoute resource for the team2 namespace that matches traffic on the /anything/team2/bar exact prefix and routes traffic to the httpbin app in the team2 namespace. The child HTTPRoute resource specifies a specific parent HTTPRoute resource by using the spec.parentRefs field.

      kubectl apply -f- <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: child-team2
  namespace: team2
spec:
  parentRefs:
  - name: parent
    namespace: gloo-system
    group: gateway.networking.k8s.io
    kind: HTTPRoute
  rules:
  - matches:
    - path:
        type: Exact
        value: /anything/team2/bar
    backendRefs:
    - name: httpbin
      port: 8000
EOF

  4. Inspect the parent and child HTTPRoute resources.

      kubectl get httproute child-team1 -n team1
kubectl get httproute child-team2 -n team2
kubectl get httproute parent -n gloo-system

  5. Send a request to the delegation.example domain along the /anything/team1/foo path. Verify that you get back a 200 HTTP response code.

      curl -I http://$INGRESS_GW_ADDRESS:8080/anything/team1/foo -H "host: delegation.example:8080"
  
      curl -I localhost:8080/anything/team1/foo -H "host: delegation.example"

    Example output:

      HTTP/1.1 200 OK
access-control-allow-credentials: true
access-control-allow-origin: *
content-type: application/json; encoding=utf-8
date: Mon, 06 May 2024 15:59:32 GMT
x-envoy-upstream-service-time: 0
server: envoy
transfer-encoding: chunked

  6. Send another request to the delegation.example domain along the /anything/team1/bar path. Verify that you get back a 404 HTTP response code, because this route is not specified in the child HTTPRoute resource child-team1.

      curl -vik http://$INGRESS_GW_ADDRESS:8080/anything/team1/bar -H "host: delegation.example:8080"
  
      curl -vik localhost:8080/anything/team1/bar -H "host: delegation.example"

    Example output:

      HTTP/1.1 404 Not Found
date: Mon, 06 May 2024 16:01:48 GMT
server: envoy
transfer-encoding: chunked

  7. Send another request to the delegation.example domain. This time, you use the /anything/team2/bar path that is configured on the child-team2 HTTPRoute resource. Verify that you get back a 200 HTTP response code.

      curl -I http://$INGRESS_GW_ADDRESS:8080/anything/team2/bar -H "host: delegation.example:8080"
  
      curl -I localhost:8080/anything/team2/bar -H "host: delegation.example"

    Example output:

      HTTP/1.1 200 OK
access-control-allow-credentials: true
access-control-allow-origin: *
content-type: application/json; encoding=utf-8
date: Mon, 06 May 2024 15:59:32 GMT
x-envoy-upstream-service-time: 0
server: envoy
transfer-encoding: chunked

  8. Send another request along the /anything/team2/bar/test path. Because the child-team2 HTTPRoute resource matches traffic only on the anything/team2/bar exact path, this request fails and a 404 HTTP response code is returned.

      curl -I http://$INGRESS_GW_ADDRESS:8080/anything/team2/bar/test -H "host: delegation.example:8080"
  
      curl -I localhost:8080/anything/team2/bar/test -H "host: delegation.example"

    Example output:

      HTTP/1.1 404 Not Found
date: Mon, 06 May 2024 16:01:48 GMT
server: envoy
transfer-encoding: chunked

Cleanup

You can remove the resources that you created in this guide.

  kubectl delete httproute parent -n gloo-system
kubectl delete httproute child-team1 -n team1
kubectl delete httproute child-team2 -n team2
kubectl delete -n team1 -f https://raw.githubusercontent.com/solo-io/gloo-mesh-use-cases/main/policy-demo/httpbin.yaml
kubectl delete -n team2 -f https://raw.githubusercontent.com/solo-io/gloo-mesh-use-cases/main/policy-demo/httpbin.yaml
kubectl delete namespaces team1 team2