Static

Route requests to services that listen for incoming traffic on a fixed IP address and port or hostname and port combination by using static Upstreams.

You simply add the list of static hosts or DNS names to your Upstream resource and then reference the Upstream in your HTTPRoute resource. Unlike Upstreams that are dynamically created by using the discovery feature in K8sGateway, static Upstream resources must be created manually by the user.

Before you begin

1. Follow the Get started guide to install K8sGateway, set up a gateway resource, and deploy the httpbin sample app.

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

   Cloud Provider LoadBalancerPort-forward for local testing

   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

Set up a static Upstream

1. Create a static Upstream resource that routes requests to the JSON testing API.

   kubectl apply -f- <<EOF 
   apiVersion: gloo.solo.io/v1
   kind: Upstream
   metadata:
     name: json-upstream
   spec:
     static:
       hosts:
         - addr: jsonplaceholder.typicode.com
           port: 80
   EOF

2. Create a RouteOption resource that rewrites the hostname to the jsonplaceholder.typicode.com.

   kubectl apply -f- <<EOF
   apiVersion: gateway.solo.io/v1
   kind: RouteOption
   metadata:
     name: rewrite
     namespace: default
   spec:
     options:
       hostRewrite: 'jsonplaceholder.typicode.com'
   EOF

3. Create an HTTPRoute resource that routes traffic on the static.example domain to your Upstream resource. To ensure that your request can be forwarded to the JSON testing API, you must also reference the RouteOption resource that rewrites hostnames to jsonplaceholder.typicode.com.

   ⚠️

   Do not specify a port in the spec.backendRefs.port field when referencing your Upstream. The port is defined in your Upstream resource and ignored if set on the HTTPRoute resource.

   kubectl apply -f- <<EOF
   apiVersion: gateway.networking.k8s.io/v1beta1
   kind: HTTPRoute
   metadata:
     name: static-upstream
     namespace: default
   spec:
     parentRefs:
     - name: http
       namespace: gloo-system
     hostnames:
       - static.example
     rules:
       - backendRefs:
         - name: json-upstream
           kind: Upstream
           group: gloo.solo.io
         filters:
         - type: ExtensionRef
           extensionRef:
             group: gateway.solo.io
             kind: RouteOption
             name: rewrite
   EOF

4. Send a request to your Upstream and verify that you get back a 200 HTTP response code and a list of posts.

   Cloud Provider LoadBalancerPort-forward for local testing

   curl -vik http://$INGRESS_GW_ADDRESS:8080/posts -H "host: static.example:8080" 

   curl -vik localhost:8080/posts -H "host: static.example:8080" 

   Example output:

    < 
    [
      {  
        "userId": 1,
        "id": 1,
        "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
        "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
      },
      {
        "userId": 1,
        "id": 2,
        "title": "qui est esse",
        "body": "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla"
      },
      {
        "userId": 1,
        "id": 3,
        "title": "ea molestias quasi exercitationem repellat qui ipsa sit aut",
        "body": "et iusto sed quo iure\nvoluptatem occaecati omnis eligendi aut ad\nvoluptatem doloribus vel accusantium quis pariatur\nmolestiae porro eius odio et labore et velit aut"
      },
      {
        "userId": 1,
        "id": 4,
        "title": "eum et est occaecati",
        "body": "ullam et saepe reiciendis voluptatem adipisci\nsit amet autem assumenda provident rerum culpa\nquis hic commodi nesciunt rem tenetur doloremque ipsam iure\nquis sunt voluptatem rerum illo velit"
      },
   ...

Cleanup

kubectl delete httproute static-upstream
kubectl delete routeoption rewrite
kubectl delete upstream json-upstream