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  • Expose an external application
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  • Prerequisites
    • Install Kong
    • Test connectivity to Kong
  • Create a Kubernetes Service
  • Test the Service
You are browsing documentation for an outdated version. See the latest documentation here.

Expose an external application

Learn to expose a service located outside the Kubernetes cluster using an Ingress.

Before you begin ensure that you have Installed Kong Ingress Controller in your Kubernetes cluster and are able to connect to Kong.

Prerequisites

Install Kong

You can install Kong in your Kubernetes cluster using Helm.

  1. Add the Kong Helm charts:

     helm repo add kong https://charts.konghq.com
     helm repo update
    
  2. Install Kong Ingress Controller and Kong Gateway with Helm:

     helm install kong kong/ingress -n kong --create-namespace
    

Test connectivity to Kong

Kubernetes exposes the proxy through a Kubernetes service. Run the following commands to store the load balancer IP address in a variable named PROXY_IP:

  1. Populate $PROXY_IP for future commands:

     HOST=$(kubectl get svc --namespace kong kong-gateway-proxy -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
     PORT=$(kubectl get svc --namespace kong kong-gateway-proxy -o jsonpath='{.spec.ports[0].port}')
     export PROXY_IP=${HOST}:${PORT}
     echo $PROXY_IP   
    
  2. Ensure that you can call the proxy IP:

     curl -i $PROXY_IP
    

    The results should look like this:

     HTTP/1.1 404 Not Found
     Content-Type: application/json; charset=utf-8
     Connection: keep-alive
     Content-Length: 48
     X-Kong-Response-Latency: 0
     Server: kong/3.0.0
      
     {"message":"no Route matched with those values"}
    

    If you are not able to connect to Kong, read the deployment guide.

Create a Kubernetes Service

  1. Deploy a Kubernetes Service type=ExternalName using the hostname of the application you want to expose.

     echo "
     kind: Service
     apiVersion: v1
     metadata:
       name: proxy-to-httpbin
     spec:
       ports:
       - protocol: TCP
         port: 80
       type: ExternalName
       externalName: httpbin.org
     " | kubectl apply -f -
    

    The results should look like this:

     service/proxy-to-httpbin created
    
  2. Create an Ingress to expose the service at the path /httpbin

    Ingress
    Gateway APIs
    echo "
    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
      name: proxy-from-k8s-to-httpbin
      annotations:
        konghq.com/strip-path: 'true'
    spec:
      ingressClassName: kong
      rules:
      - host: kong.example
        http:
          paths:
          - path: /httpbin
            pathType: ImplementationSpecific
            backend:
              service:
                name: proxy-to-httpbin
                port:
                  number: 80
    " | kubectl apply -f -
    echo "
    apiVersion: gateway.networking.k8s.io/v1beta1
    kind: HTTPRoute
    metadata:
      name: proxy-from-k8s-to-httpbin
      annotations:
        konghq.com/strip-path: 'true'
    spec:
      parentRefs:
      - name: kong
      hostnames:
      - 'kong.example'
      rules:
      - matches:
        - path:
            type: PathPrefix
            value: /httpbin
        backendRefs:
        - name: proxy-to-httpbin
          kind: Service
          port: 80
    " | kubectl apply -f -

    The results should look like this:

    ingress
    Gateway APIs
    ingress.networking.k8s.io/proxy-from-k8s-to-httpbin created
    httproute.gateway.networking.k8s.io/proxy-from-k8s-to-httpbin created

Test the Service

curl -i -H 'Host:kong.example' $PROXY_IP/httpbin/anything

The results should look like this:

HTTP/1.1 200 OK
Date: Thu, 15 Dec 2022 21:31:47 GMT
Content-Type: application/json
Content-Length: 341
Connection: keep-alive
Server: gunicorn/19.9.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
X-Kong-Upstream-Latency: 2
X-Kong-Proxy-Latency: 1
Via: kong/3.1.1

{
  "args": {},
  "data": "",
  "files": {},
  "form": {},
  "headers": {
    "Accept": "*/*",
    "Host": "httpbin.org",
    "User-Agent": "curl/7.86.0",
    "X-Amzn-Trace-Id": "Root=1-639b9243-7cdb670008b8189a5948d619"
  },
  "json": null,
  "method": "GET",
  "origin": "136.25.153.9",
  "url": "http://httpbin.org/anything"
}
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