Deploy the weather-exporter helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `weather-exporter` Helm chart on a Digital Ocean Kubernetes Service (DOKS), you'll need two parts: provisioning the Kubernetes cluster on Digital Ocean and deploying the Helm chart to that cluster. Below, I will guide you through the entire process using Pulumi with TypeScript.

### Provisioning the Digital Ocean Kubernetes Cluster

First, you need to create a Kubernetes cluster on Digital Ocean. We will use the `digitalocean.KubernetesCluster` resource from the Pulumi Digital Ocean package to create a new DOKS cluster. You can customize the cluster configuration such as the region, version, node size, and number of nodes as needed.

### Deploying the Helm Chart

Once the cluster is provisioned, you can deploy the `weather-exporter` Helm chart to it. For this, you'll use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes package. You'll need to specify the chart details such as repository, chart name, and any custom values you want to set.

Here's a Pulumi program that puts this all together:

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

// Create a Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc3", // New York data center region
    version: "latest", // Specify the Kubernetes version or use "latest"
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb", // Node size (this is DigitalOcean's node naming convention)
        nodeCount: 2, // Number of nodes in the node pool
    },
});

// Export the kubeconfig to access the cluster
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Set up a provider to use the cluster kubeconfig
const k8sProvider = new k8s.Provider("do-k8s-provider", {
    kubeconfig: kubeconfig,
});

// Deploy the weather-exporter helm chart to the cluster
const weatherExporterChart = new k8s.helm.v3.Chart("weather-exporter-chart", {
    chart: "weather-exporter", // The name of the chart
    // This assumes 'weather-exporter' is publicly available in a Helm chart repository
    // If it's not, you'll need to set the `repo` field to point to the repository URL
    // and potentially specify a version with the `version` field if not using the latest version.
    values: {}, // Placeholder for any chart values to override.
}, { provider: k8sProvider }); // Ensures we use the provider that has access to our newly created cluster

// Running this program will provision a DigitalOcean Kubernetes cluster and deploy the weather-exporter chart to it.
```

### Understanding the Code

- We start by importing the necessary packages from Pulumi for Digital Ocean and Kubernetes.
- We create a Kubernetes cluster on Digital Ocean using `digitalocean.KubernetesCluster`.
- We configure the Digital Ocean provider with the kubeconfig from our cluster, which is required to deploy resources to it.
- We then deploy the `weather-exporter` Helm chart using `k8s.helm.v3.Chart`.

You will need an existing Pulumi account, have the Pulumi CLI installed, and configure it to use your Digital Ocean API token.

Run the following commands to deploy this Pulumi program:

```bash
# Login to Pulumi - this will require a web browser to log into the Pulumi service
pulumi login

# Create a new Pulumi stack for your project
# A 'stack' represents a single deployable instance of your project
pulumi stack init dev

# Install the necessary dependencies for our program
npm install @pulumi/pulumi @pulumi/digitalocean @pulumi/kubernetes

# Run pulumi up to preview and deploy changes
# This will show you a preview of what will be deployed and prompt you to confirm the deployment
pulumi up
```

Please replace placeholders, such as the name of the node pool or the specific version of Kubernetes you wish to use, as needed for your particular application needs.

After running `pulumi up`, the Digital Ocean Kubernetes cluster and `weather-exporter` Helm chart deployment will be provisioned in your Digital Ocean account.