blue-green

Hello World HTTPRoute Example

This example demonstrates how to use an HTTPRoute to expose simple "hello world" applications through the HAProxy Kubernetes Gateway, using both prefix and exact path matching.

What is being deployed

This example deploys the following resources:

• A GatewayClass named haproxy that defines a class of Gateways that can be provisioned by the HAProxy Kubernetes Gateway.
• A Gateway named hug-gateway that requests a listener on port 31080 for HTTP traffic.
• An HTTPRoute that directs traffic for blue-green.haproxy.local to two different services with weights:
  • 90% of the traffic is sent to the blue service.
  • 10% of the traffic is sent to the green service.
• Two Deployments and Services for the echo applications:
  • blue: A simple echo server representing the "blue" version.
  • green: Another simple echo server representing the "green" version.

How to deploy

kubectl apply -f .

How to check if the result is correct

POD

$ cat /usr/local/hug/maps/hug_default_hug-gateway_http/path_prefix.map
blue-green.haproxy.local/ {"a":"wr","l":"hug_default_blue_8888__:90,hug_default_green_8888__:10"}

curl

Use curl to send a request to the services through the Gateway.

GW_IP=$(kubectl get gateway hug-gateway -n default -o jsonpath='{.status.addresses[0].value}')
curl http://$GW_IP:31080/hostname -H "Host: blue-green.haproxy.local"

You should see a response from the services, confirming that the traffic was routed correctly (one of two services).

blue-77f7ddfc87-cmr94
green-665cfb454f-qs68k

script

$ sh test.sh
90 blue
10 green

Note that due to randomness, 9/1 ratio might slightly differ