Traffic splitting

Before you begin link

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 link

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 link

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/v1beta1
   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].ip}')
   echo $INGRESS_GW_ADDRESS  
     

     export INGRESS_GW_ADDRESS=$(kubectl get svc -n gloo-system gloo-proxy-http -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')
   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 link

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