Using kubernetes traefik.io with networking.cfargotunnel.com

Question

Pulumi · Accepted Answer

To use Traefik with Cloudflare's Argo Tunnel on a Kubernetes cluster, you need to:

1. Set up a Kubernetes cluster. (This step is out of the scope of our discussion here, as I'll focus on the configuration of Traefik and Argo Tunnel assuming you already have a cluster running).

2. Deploy Traefik as your Ingress controller within the cluster. Traefik acts as a router and entry point to your Kubernetes services, routing incoming HTTP(S) traffic to the correct services.

3. Configure Cloudflare Argo Tunnel to create a secure connection between your Kubernetes cluster and Cloudflare's edge network. This will enable you to expose your services securely without having to open a public IP in your firewall.

Now, let's design a Pulumi program that configures Traefik as an Ingress controller to use Cloudflare Argo Tunnel within a Kubernetes cluster using TypeScript.

Firstly, you need to install the necessary Pulumi package dependencies:
- Pulumi Kubernetes provider (`@pulumi/kubernetes`) to manage Kubernetes resources.
- Pulumi Cloudflare provider (`@pulumi/cloudflare`) to manage Cloudflare resources such as Argo Tunnel.

Here is the Pulumi program that outlines the necessary steps:

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

// Basic settings: adjust the values for namespace and Cloudflare details according to your setup.
const namespace = 'traefik'; // Namespace where Traefik is deployed
const cloudflareAccountId = 'your-cloudflare-account-id'; // Replace with your Cloudflare account ID
const cloudflareZoneId = 'your-cloudflare-zone-id'; // Replace with your Cloudflare zone ID
const tunnelName = 'my-argo-tunnel'; // Give your Cloudflare Argo Tunnel a name

// Step 1: Deploy Traefik as an Ingress controller
// You can customize Traefik's Helm Chart values here according to your preferences.
const traefikChart = new k8s.helm.v3.Chart('traefik', {
  chart: 'traefik',
  version: '9.18.2', // Specify the version of Traefik Helm chart you wish to use
  fetchOpts: {repo: 'https://helm.traefik.io/traefik'},
  namespace: namespace,
  values: {
    // Additional Traefik configuration here
  },
});

// Step 2: Configure the Cloudflare Argo Tunnel.
// This requires having cloudflared installed in your Kubernetes cluster.
// You could use a Kubernetes Job to execute the necessary cloudflared commands, or handle setup outside of Pulumi.
const argoTunnel = new cloudflare.Tunnel('argo-tunnel', {
  name: tunnelName,
  accountId: cloudflareAccountId,
  secret: pulumi.secret('your-cloudflare-argo-tunnel-secret'), // Replace with your Cloudflare Argo Tunnel secret
});

// In order to direct traffic through the Argo Tunnel, DNS records must be created.
const dnsRecord = new cloudflare.Record('dns-record', {
  name: 'your-service', // Replace with the subdomain you want to use
  value: argoTunnel.id, // This associates the DNS record with the Argo Tunnel
  type: 'CNAME',
  zoneId: cloudflareZoneId,
  ttl: 1,
});

// Export relevant values, such as the publicly accessible URL
export const publicUrl = pulumi.interpolate`https://${dnsRecord.name}`;

```

This program sets up Traefik and prepares the integration of Cloudflare Argo Tunnel. Note the following:
- We use the Pulumi Kubernetes provider to deploy Traefik using the official Helm chart. You can customize the values to fit your configuration needs.
- We define a Cloudflare Argo Tunnel resource, which establishes the secure tunnel from your cluster to Cloudflare.
- We create a DNS record that points to the Argo Tunnel, effectively exposing your selected service through Cloudflare.

To fill in this template, you will need to replace placeholders (like `'your-cloudflare-account-id'`) with actual values from your Cloudflare account and desired configuration.

Remember, to apply this configuration, you'll need both `kubectl` and `pulumi` CLI tools installed and configured. Run `pulumi up` to create or update your cloud resources according to this program.