Deploy the tailscale-subnet-router helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy the Tailscale Subnet Router Helm chart on a Rancher-managed Kubernetes cluster using Pulumi, you need to perform several steps including setting up Rancher, configuring a Kubernetes cluster, and deploying the Helm chart via Pulumi. Below, we will go through the process step by step.

### 1. Set up the Rancher Kubernetes Cluster

Before you can deploy a Helm chart with Pulumi, you first need a Kubernetes cluster managed by Rancher. This can be accomplished by creating a `rancher2.Cluster` resource.

### 2. Configure Pulumi to Use the Rancher Kubernetes Cluster

After creating the cluster, you must configure Pulumi to use the `kubeconfig` associated with the Rancher cluster. You can wire this through Pulumi's configuration system or use environmental variables.

### 3. Deploy the Tailscale Subnet Router Helm Chart

You can deploy the Tailscale Subnet Router using Pulumi's Helm support. You'll need to use the `helm.v3.Chart` resource and specify the correct chart values.

### 4. Program Example

```typescript
import * as rancher2 from "@pulumi/rancher2";
import * as k8s from "@pulumi/kubernetes";
import * as pulumi from "@pulumi/pulumi";

const config = new pulumi.Config();
const rancherCluster = config.require("rancherCluster");

// Step 1: Fetch the kubeconfig from the Rancher Cluster
const cluster = rancher2.getCluster({
    name: rancherCluster,
});

// Parsing `cluster.kubeConfig` and configuring the provider
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: cluster.kubeConfig,
});

// Step 2: Deploy the Tailscale Subnet Router Helm chart
const subnetRouterChart = new k8s.helm.v3.Chart("tailscale-subnet-router", {
    chart: "tailscale-subnet-router",
    // You would replace `repoUrl` with the actual Helm repository URL
    fetchOpts: {
        repo: "https://helm.repo.url",
    },
    // Specify necessary values for the Helm chart here
    values: {
        // Configuration values for Tailscale subnet router
    },
}, { provider: k8sProvider });

// Export the resources created
export const subnetRouterChartName = subnetRouterChart.metadata.name;
```

Let's break down what each step in the program does:

- Imports required Pulumi packages for Rancher, Kubernetes, and tapping into the Pulumi configuration system.
- Fetches the kubeconfig from the existing Rancher2-managed Kubernetes cluster.
- Parses the kubeconfig to prepare the Kubernetes provider for Pulumi.
- Deploys the Tailscale Subnet Router Helm chart using the Helm package in Pulumi and points to the existing Helm repository where the chart is hosted.
- Sets up helm chart values according to Tailscale's specific configuration requirements (unspecified in this code since they're unique to your setup).
- Exports the Helm chart name, which allows you to observe the output after deployment.

Remember to replace `"https://helm.repo.url"` with the actual URL of the Helm repository where the Tailscale chart is located. Moreover, you should configure the `values` property with the necessary options required for the Tailscale Subnet Router, like the authentication key or any network configurations.

To run the above Pulumi program, you would need to have Pulumi installed and set up alongside a Rancher2 Kubernetes cluster. Once these prerequisites are in place, you can run the following command to deploy the Helm chart:

```bash
pulumi up
```

This command will prompt you with a preview of what will be deployed. If it looks good, confirm the prompt to proceed with the deployment.