Deploy the variant-cron helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `variant-cron` Helm chart on Digital Ocean Kubernetes Service (DOKS), you'll need to follow a few steps. I'll guide you through setting up the necessary infrastructure using Pulumi and TypeScript.

### What You'll Do:
1. **Set Up a DOKS Cluster**: First, you will create a Kubernetes cluster on DigitalOcean Cloud Services. This provides the environment where your Helm chart will be deployed.
2. **Install the Helm Chart**: Once the cluster is ready, you'll deploy the `variant-cron` Helm chart to the cluster. Helm charts are packages of pre-configured Kubernetes resources.

### Prerequisites:
Make sure you have the following before you start:
- Pulumi CLI installed and configured for TypeScript.
- Access to your DigitalOcean account with the necessary permissions to create resources.
- helm CLI tool installed (though Pulumi abstracts its usage, it's good practice to have it).

### Step 1: Define Your Pulumi Program
First, you'll establish your Pulumi program. This will include setting up the DigitalOcean Kubernetes Cluster and then deploying the `variant-cron` Helm chart to it.

The `digitalocean.KubernetesCluster` resource will be used to create your Kubernetes cluster. After the cluster is provisioned, you'll use the `kubernetes.helm.v3.Chart` resource to deploy the Helm chart.

Here is the TypeScript program you'll execute to deploy your infrastructure:

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

// Step 1: Create a DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    // You can choose the region that is closest to you.
    region: 'nyc3',
    // Select the version of Kubernetes to use.
    version: 'latest',
    // Define the node pool for the Kubernetes cluster.
    nodePool: {
        name: 'default',
        size: 's-2vcpu-2gb',
        nodeCount: 2,
        // Optionally, you can tag your nodes for organizational purposes.
        // tags: ['your', 'optional', 'tags'],
    },
});

// Step 2: Deploy the 'variant-cron' Helm chart to the cluster.
// First, obtain the provider configuration from the DigitalOcean cluster resource.
const k8sProvider = new kubernetes.Provider('k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Now, use the Helm Chart resource to deploy 'variant-cron'.
const helmChart = new kubernetes.helm.v3.Chart('variant-cron-chart', {
    chart: 'variant-cron',
    // Specify the repository containing the 'variant-cron' Helm chart.
    // If the Helm chart is part of the official Helm repository, you may omit the `repo` attribute.
    // Otherwise, provide the full URL to the chart repository.
    // Example: repo: 'https://charts.example.com/',
    version: '1.0.0', // The version of the Helm chart you want to deploy.
    namespace: 'default', // The Kubernetes namespace to deploy into. You might need to create it if it's not `default`.
}, { provider: k8sProvider });

// Export the DigitalOcean Kubernetes cluster endpoint to access it externally.
export const clusterEndpoint = cluster.endpoint;

// Export the Kubernetes cluster name, useful for managing the cluster with 'kubectl'.
export const clusterName = cluster.name;
```

### Understanding What This Program Does:
- It creates a DigitalOcean Kubernetes cluster (`KubernetesCluster`) in the specified region with the mentioned configuration, including the size and count of nodes.
- It provisions a Kubernetes provider using the created cluster's kubeconfig. This allows Pulumi to communicate with the new cluster.
- It uses the `Chart` resource to deploy the `variant-cron` Helm chart, which must be hosted on a Helm chart repository. If needed, you can specify additional values and configurations for the Helm chart not covered in this example.

### After Deployment:
After you've run this Pulumi program, your Digital Ocean Kubernetes Service cluster will be running, and it will have the `variant-cron` Helm chart deployed. You can manage further operations on this infrastructure using Pulumi updates or `kubectl` commands against the cluster.