Deploy the tailscale-subnet-router helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Tailscale subnet router Helm chart on a Digital Ocean Kubernetes cluster using Pulumi, you will first need to create a Kubernetes cluster in Digital Ocean. Once the cluster is up and running, you'll utilize Helm to deploy the Tailscale subnet router onto it. Below, I'll walk you through the steps with a detailed explanation and then provide you with the TypeScript program to accomplish this.

1. **DigitalOcean KubernetesCluster** resource is used to create a managed Kubernetes cluster on Digital Ocean. You'll need to specify the region, version, and node pool configuration. This sets up the infrastructure where your Tailscale subnet router will be deployed.
   
2. **Helm Chart** resource is used to deploy applications on Kubernetes using Helm charts. We'll utilize this resource to deploy the Tailscale subnet router Helm chart. You'll need to specify the Helm chart details such as name, version (if required), and any custom values you may wish to apply.

Here is the TypeScript program that achieves this:

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

// Step 1: Create a new DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    // Specify the region for the cluster
    region: digitalocean.Regions.NYC1,
    // Define the Kubernetes version
    version: 'latest',  // Use the latest available version
    // Define the node pool where the workloads will be scheduled
    nodePool: {
        // Unique name for the node pool
        name: 'default-pool',
        // Droplet size for the nodes in the pool
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        // Number of nodes in the pool
        nodeCount: 2,
    },
});

// Step 2: Use the DigitalOcean Kubernetes cluster with the Pulumi Kubernetes provider
const k8sProvider = new kubernetes.Provider('k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Install the Tailscale Subnet Router helm chart
const tailscaleChart = new kubernetes.helm.v3.Chart('tailscale-subnet-router', {
    // Define the chart repository and name
    chart: 'tailscale',
    // Specify the namespace to install the chart into
    namespace: 'default',
    // Specify any additional values needed by the chart
    values: {
        // This should be filled with any required values for the Tailscale chart
    },
    // Reference the previously created DigitalOcean Kubernetes cluster's provider
    fetchOpts: {
        repo: 'https://helm.tailscale.com',
    },
}, { provider: k8sProvider });

// Export the K8s cluster name and the Kubeconfig to access the cluster
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const clusterName = cluster.name;
```

This program begins by importing the required modules. We then create a new Kubernetes cluster on Digital Ocean with a specified region, Kubernetes version, and a node pool configuration. After the cluster is up and running, we create a new instance of the Pulumi Kubernetes provider, passing the generated kubeconfig of our Digital Ocean cluster. Then we deploy the Tailscale subnet router Helm chart, specifying the chart details and namespace into which it will be deployed.

After applying this Pulumi program with `pulumi up`, you'll have a Kubernetes cluster running on Digital Ocean with the Tailscale subnet router Helm chart installed. The exports at the end of the file provide you with the necessary details to access your Kubernetes cluster.