Using kubernetes configuration.konghq.com with k8s.nginx.org

Question

Pulumi · Accepted Answer

When you want to use `konghq.com` configuration with `k8s.nginx.org` within a Kubernetes cluster, you're typically looking to set up Kong as your API gateway and Nginx as your ingress controller. The Kong API gateway will manage your APIs, while Nginx Ingress Controller will manage external access to the services in your Kubernetes cluster.

In Pulumi, you can define this setup using Kubernetes resources such as ConfigMaps, Ingress resources, and possibly CustomResourceDefinitions (CRDs), depending on the specific features and configuration you need from Kong and Nginx. You will also need to ensure that the Nginx Ingress Controller and the Kong Gateway are installed on your Kubernetes cluster.

For simplicity's sake, let's assume that you already have the Kong Gateway and Nginx Ingress Controller installed. Below is a program that shows how you might configure a simple Nginx Ingress resource to work together with Kong within a Kubernetes cluster using Pulumi with TypeScript.

This program does the following:
- Defines a Kubernetes `ConfigMap` for Kong configuration.
- Defines a Kubernetes `ConfigMap` for Nginx configuration.
- Sets up an Ingress resource with annotations that tell the ingress controller to use Nginx.

Note: If you require Kong's custom resource definitions (e.g. KongPlugin, KongConsumer), you would also need to ensure that those CRDs are applied to the cluster, and you would represent those CRDs using Pulumi's `CustomResource` class. This program doesn't cover the application of Kong CRDs as it focuses on configuring Nginx to work with an existing Kong installation.

```typescript
import * as k8s from "@pulumi/kubernetes";

// Create a ConfigMap for the Kong configuration
const kongConfigMap = new k8s.core.v1.ConfigMap("kong-config", {
    metadata: { name: "kong-config" },
    data: { 
        // ... include necessary Kong configuration options here ...
    },
});

// Create a ConfigMap for the Nginx configuration - if required
const nginxConfigMap = new k8s.core.v1.ConfigMap("nginx-config", {
    metadata: { name: "nginx-config" },
    data: { 
        // ... include necessary Nginx configuration options here ...
    },
});

// Define an Ingress resource that uses the Nginx ingress controller
// and has Kong related configurations via annotations.
const myAppIngress = new k8s.networking.v1.Ingress("myapp-ingress", {
    metadata: {
        name: "myapp-ingress",
        annotations: {
            // These annotations can direct traffic to Kong, specify plugins, etc.
            "kubernetes.io/ingress.class": "nginx",

// ... include any other Kong related annotations ...

// Ensure to adjust these values based on your actual Kong and Nginx setup.
        }
    },
    spec: {
        rules: [{
            http: {
                paths: [{
                    path: "/myapp",
                    pathType: "Prefix",
                    backend: {
                        service: {
                            name: "myapp-service",
                            port: {
                                number: 80,
                            },
                        },
                    },
                }],
            },
        }],
        // If you are using TLS, you would include that configuration here.
    },
});

// Export the Ingress hostnames, if necessary.
export const ingressHostname = myAppIngress.status.loadBalancer.ingress[0].hostname;
```

In this program:
- `ConfigMaps` are standard Kubernetes resources used to store configuration data in key-value pairs, which can then be consumed by other Kubernetes resources like Pods.
- `Ingress` is a Kubernetes resource that manages external access to the services within a cluster, typically HTTP/HTTPS traffic. Pulumi allows you to define ingress rules which the Ingress Controller, in this case, Nginx, would use to route traffic to your application services.
- Annotations in the Ingress resource are used to provide additional configuration parameters to Nginx or, in this case, inform Nginx to interface with Kong.

Remember, this example assumes that the equivalent Nginx and Kong components (e.g., in a Helm chart or as pre-installed resources) are already available on your cluster. The actual setup for these systems can be complex and would require a deeper dive into both Kong's and Nginx's documentation, as well as their Pulumi components or Helm charts.

Lastly, to apply this Pulumi program to your Kubernetes cluster, you will need to have Pulumi installed and configured for use with your Kubernetes cluster. Once that is set up, you can place this code in a `.ts` file and use `pulumi up` to deploy these resources to your cluster.