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Traffic splitting

Traffic splitting

Set up weight-based routing between multiple apps.

Before you begin

Follow the Get started guide to install K8sGateway, 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
    Setting Description
    spec.parentRefs.name The 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.hostnames The hostname for which you want to apply traffic splitting.
    spec.rules.matches.path The path prefix to match on. In this example, / is used.
    spec.rules.backendRefs A 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 remove the resources that you created in 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