Deploy the helm-guestbook helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `helm-guestbook` Helm chart on Digital Ocean Kubernetes Service using Pulumi, we will follow these steps:

1. **Create a Kubernetes cluster in Digital Ocean**: We'll use the `digitalocean.KubernetesCluster` resource to provision a cluster. This step involves specifying the region, version, and node pool configuration.

2. **Deploy the Helm release**: After the Kubernetes cluster is up and running, we'll deploy the Helm release using the `kubernetes.helm.sh/v3.Chart` resource provided by Pulumi's Kubernetes provider.

Below is a Pulumi program written in TypeScript that accomplishes these steps. I'll explain each part as we go through it.

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

// Create a DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    region: 'nyc1', // Choose the region that is closest to you or your users.
    version: 'latest', // Specify the version or use 'latest'.
    nodePool: {
        name: 'default-pool',
        size: 's-2vcpu-2gb', // Choose the size that fits your needs and budget.
        nodeCount: 2, // Choose how many nodes you want in the node pool.
    },
});

// Create a Kubernetes provider instance using the kubeconfig from the DigitalOcean cluster.
const k8sProvider = new kubernetes.Provider('do-k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the `helm-guestbook` Helm chart on the DigitalOcean Kubernetes cluster.
const guestbookChart = new kubernetes.helm.v3.Chart('helm-guestbook', {
    chart: 'guestbook',
    version: '0.2.0', // Specify the version of the chart.
    fetchOpts: {
        repo: 'https://charts.example.com/', // Specify the repository where the chart can be found.
    },
}, { provider: k8sProvider });

// Export the Kubernetes cluster name and the guestbook chart status.
export const clusterName = cluster.name;
export const guestbookStatus = guestbookChart.status;
```

This program will do the following:
- Import the required Pulumi libraries for DigitalOcean and Kubernetes.
- Create a new Kubernetes cluster on DigitalOcean using reasonable defaults for the region, version, and node pool size.
- Retrieve the kubeconfig of the newly created cluster to interact with it.
- Create a new Helm chart deployment using the Kubernetes provider and specifying the chart name, version, and the repository.
- Export the cluster name and the status of the Helm deployment for easy access.

Once you have this program, make sure you have Pulumi and the DigitalOcean provider configured with the necessary tokens. You can then run `pulumi up` to deploy this infrastructure.

Remember to replace `'https://charts.example.com/'` with the actual repository URL where the `guestbook` chart is hosted.

After deploying the cluster and the application, you will be able to use `kubectl` to interact with your Kubernetes cluster and view the status of your application.