Proxy the httpbin service with Ingress

This document explains how apisix-ingress-controller guides Apache APISIX routes traffic to httpbin service correctly by the Kubernetes Ingress.

Prerequisites

• Prepare an available Kubernetes cluster in your workstation, we recommend you to use Minikube.
• Install Apache APISIX in Kubernetes by Helm Chart.
• Install apisix-ingress-controller.

Deploy httpbin service

We use kennethreitz/httpbin as the service image, See its overview page for details.

Now, try to deploy it to your Kubernetes cluster:

kubectl run httpbin --image kennethreitz/httpbin --port 80
kubectl expose pod httpbin --port 80

Resource Delivery

Here we create an Ingress resource.

# httpbin-ingress.yaml
# Note use apiVersion is networking.k8s.io/v1, so please make sure your
# Kubernetes cluster version is v1.19.0 or higher.
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: httpserver-ingress
spec:
  # apisix-ingress-controller is only interested in Ingress
  # resources with the matched ingressClass name, in our case,
  # it's apisix.
  ingressClassName: apisix
  rules:
  - host: local.httpbin.org
    http:
      paths:
      - backend:
          service:
            name: httpbin
            port:
              number: 80
        path: /
        pathType: Prefix

# Use ingress.networking.k8s.io/v1beta1 if your Kubernetes cluster
# version is older than v1.19.0.
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: httpserver-ingress
  # Note for ingress.networking.k8s.io/v1beta1,
  # you have to carry annotation kubernetes.io/ingress.class,
  # and its value must be matched with the one configured in
  # apisix-ingress-controller, in our case, it's apisix.
  annotations:
    kubernetes.io/ingress.class: apisix
spec:
  rules:
    - host: local.httpbin.org
      http:
        paths:
          - backend:
              serviceName: httpbin
              servicePort: 80
            path: /
            pathType: Prefix

The YAML snippet shows a simple Ingress configuration, which tells Apache APISIX to route all requests with Host local.httpbin.org to the httpbin service. Now try to create it.

kubectl apply -f httpbin-ingress.yaml

Test

Run curl call in one of Apache APISIX Pods to check whether the resource was delivered to it. Note you should replace the value of --default-apisix-cluster-admin-key to the real admin_key value in your Apache APISIX cluster.

kubectl exec -it -n ${namespace of Apache APISIX} ${Pod name of Apache APISIX} -- curl http://127.0.0.1:9180/apisix/admin/routes -H 'X-API-Key: edd1c9f034335f136f87ad84b625c8f1'

And request to Apache APISIX to verify the route.

kubectl exec -it -n ${namespace of Apache APISIX} ${Pod name of Apache APISIX} -- curl http://127.0.0.1:9080/headers -H 'Host: local.httpbin.org'

In case of success, you'll see a JSON string which contains all requests headers carried by curl like:

{
  "headers": {
    "Accept": "*/*",
    "Host": "httpbin.org",
    "User-Agent": "curl/7.64.1",
    "X-Amzn-Trace-Id": "Root=1-5ffc3273-2928e0844e19c9810d1bbd8a"
  }
}