Deploy the thanos-traefik helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Thanos-Traefik Helm chart on DigitalOcean's Kubernetes Service using Pulumi, you will be using two main components:

1. **DigitalOcean Kubernetes (DOKS) Cluster**: This is where your applications will run. You'll use Pulumi's `digitalocean.KubernetesCluster` resource to create and manage this cluster. The DOKS cluster will provide you with a set of nodes (which are DigitalOcean Droplets) that are configured to work together to run containerized applications.

2. **Helm Chart**: Helm is a package manager for Kubernetes that allows you to define, install, and upgrade complex Kubernetes applications. Thanos and Traefik are commonly used tools in Kubernetes ecosystems—Thanos for metrics aggregation and Traefik as an ingress controller. You will use Pulumi's `kubernetes.helm.sh/v3.Chart` resource to deploy the combined Thanos-Traefik Helm chart to your Kubernetes cluster.

Here's a Pulumi program in TypeScript that demonstrates how to perform these tasks:

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

// Step 1: Create a new DigitalOcean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("thanos-traefik-cluster", {
    // Ensure the region supports Kubernetes.
    region: digitalocean.Regions.NYC3,
    // Define the size of the Droplets for your worker nodes.
    // Check the DigitalOcean documentation for different Droplet sizes.
    nodePool: {
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        name: "thanos-traefik-node-pool",
        nodeCount: 2, // Specify the number of worker nodes for the cluster
    },
    // Select the version of Kubernetes you want to install on your cluster.
    // Use the most recent version compatible with the Thanos-Traefik Helm chart.
    version: "1.23.5-do.0",
});

// Step 2: Deploy the Thanos-Traefik Helm chart on the cluster
// You must first configure your Pulumi program to use the correct Kubernetes provider.
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Now, using the Kubernetes provider, you can deploy your Helm chart.
const thanosTraefikHelmChart = new kubernetes.helm.v3.Chart("thanos-traefik", {
    // The name of the chart. Replace "thanos-traefik" with the actual chart name if it's different.
    chart: "thanos-traefik",
    // Specify the Helm repository URL if it's not a stable chart.
    fetchOpts: {
        repo: "https://helm-repo/thanos-traefik", // replace with actual Helm repo URL
    },
    // Optional: specify the version of the chart.
    version: "1.0.0",
    // Optional: specify values for the Helm chart.
    values: {
        // Values required by the Thanos-Traefik chart.
        // This typically includes configurations such as resource requests/limits.
        // Provide them as per the chart's requirements.
    },
}, { provider: k8sProvider });

// Export the public IP of the Traefik ingress to access it from the Internet
export const ingressIp = thanosTraefikHelmChart.getResourceProperty(
    "v1/Service", "thanos-traefik", "status",
).apply(status => status.loadBalancer.ingress[0].ip);

// Also, export the cluster's kubeconfig for administrative operations
export const kubeConfig = cluster.kubeConfigs[0].rawConfig;
```

### Explaining the Program:

- Imports: We import the necessary Pulumi packages for DigitalOcean and Kubernetes.

- Cluster Creation: We begin by creating a new DigitalOcean Kubernetes cluster using `digitalocean.KubernetesCluster`. Here, we specify the region, the size, and number of nodes for the node pool, and the Kubernetes version.

- Kubernetes Provider: We define a Pulumi Kubernetes provider to interact with the newly created DOKS using its `kubeconfig`.

- Helm Chart Deployment: Using `kubernetes.helm.v3.Chart`, we deploy our Thanos-Traefik Helm chart, providing the chart name, and repository along with any custom values needed by the chart.

- Exports: The program exports the public IP address for Traefik (allowing you to visit your applications) and the raw kubeconfig that you can use with `kubectl` for manual administrative operations.

Please ensure that you have the Pulumi CLI installed, are authenticated against DigitalOcean via Pulumi, and have set up your Pulumi stack before running this program.

This program should be saved as `index.ts` in a Pulumi project. After initializing a Pulumi project, you can run the program with the following commands:
```sh
pulumi up      # to preview and deploy changes
pulumi stack output ingressIp # to see the exposed IP address after deployment
```

Lastly, please replace `"https://helm-repo/thanos-traefik"` with the actual URL of the Helm repository and adjust the chart values according to the requirements of Thanos and Traefik Helm chart.