Before you begin

Follow the Get started guide to install Gloo Gateway, set up a gateway resource, and deploy the httpbin sample app.

Deploy the Helloworld sample app

To demonstrate weighted routing for multiple apps, deploy 3 versions of the Helloworld sample app.

  1. Create the helloworld namespace.

      kubectl create namespace helloworld

  2. Deploy the Hellworld sample apps.

      kubectl -n helloworld apply -f https://raw.githubusercontent.com/solo-io/gloo-edge-use-cases/main/docs/sample-apps/helloworld.yaml

    Example output:

      service/helloworld-v1 created
service/helloworld-v2 created
service/helloworld-v3 created
deployment.apps/helloworld-v1 created
deployment.apps/helloworld-v2 created
deployment.apps/helloworld-v3 created

  3. Verify that the Helloworld pods are up and running.

      kubectl -n default get pods -n helloworld

    Example output:

      NAME                             READY   STATUS    RESTARTS   AGE
helloworld-v1-5c457458f-rfkc7    3/3     Running   0          30s
helloworld-v2-6594c54f6b-8dvjp   3/3     Running   0          29s
helloworld-v3-8576f76d87-czdll   3/3     Running   0          29s

Set up weighted routing

  1. Create an HTTPRoute resource for the traffic.split.example domain that routes 10% of the traffic to helloworld-v1, 10% to helloworld-v2, and 80% to helloworld-v3.

      kubectl apply -f- <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: traffic-split
  namespace: helloworld
spec:
  parentRefs:
  - name: http
    namespace: gloo-system
  hostnames:
  - traffic.split.example
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /
    backendRefs:
    - name: helloworld-v1
      port: 5000
      weight: 10
    - name: helloworld-v2
      port: 5000
      weight: 10
    - name: helloworld-v3
      port: 5000
      weight: 80
EOF
    SettingDescription
    spec.parentRefs.nameThe name and namespace of the gateway resource that serves the route. In this example, you use the gateway that you installed as part of the Get started guide.
    spec.hostnamesThe hostname for which you want to apply traffic splitting.
    spec.rules.matches.pathThe path prefix to match on. In this example, / is used.
    spec.rules.backendRefsA list of services you want to forward traffic to. Use the weight option to define the amount of traffic that you want to forward to each service.

  2. Verify that the HTTPRoute is applied successfully.

      kubectl get httproute/traffic-split -n helloworld -o yaml

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

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

  4. Send a few requests to the /hello path. Verify that you see responses from all 3 Helloworld apps, and that most responses are returned from helloworld-v3.

      curl -vik http://$INGRESS_GW_ADDRESS:8080/hello -H "host: traffic.split.example:8080"
  
      curl -vik localhost:8080/hello -H "host: traffic.split.example"

    Example output:

      * Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< server: envoy
server: envoy
< date: Mon, 20 Nov 2023 18:04:30 GMT
date: Mon, 20 Nov 2023 18:04:30 GMT
< content-type: text/html; charset=utf-8
content-type: text/html; charset=utf-8
< content-length: 60
content-length: 60
< x-envoy-upstream-service-time: 178
x-envoy-upstream-service-time: 178

< 
Hello version: v3, instance: helloworld-v3-8576f76d87-hhn4r

Cleanup

You can optionally remove the resources that you created as part of this guide.

  1. Remove the HTTP route resource.

      kubectl delete httproute traffic-split -n helloworld

  2. Remove the Helloworld apps.

      kubectl delete -n helloworld -f https://raw.githubusercontent.com/solo-io/gloo-edge-use-cases/main/docs/sample-apps/helloworld.yaml