Deploy the servicemesh-k8ssandra-resource helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `servicemesh-k8ssandra-resource` helm chart on the DigitalOcean Kubernetes Service using Pulumi, you'll need to follow these steps:

1. **Setting up DigitalOcean Kubernetes Cluster**:
   - First, you need to create a Kubernetes cluster in DigitalOcean where your helm chart will be deployed. This is done by using the `digitalocean.KubernetesCluster` resource.
   
2. **Deploying Helm Chart**:
   - Once the Kubernetes cluster is ready, you will use the `kubernetes.helm.v3.Chart` resource to deploy the `servicemesh-k8ssandra-resource` helm chart onto the cluster. This Pulumi resource manages the Helm chart's deployment just as `helm` CLI does but through Pulumi's infrastructure as code approach.

Here is a step-by-step TypeScript program that accomplishes this:

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

// Generate a strong password for the Kubernetes cluster, you may also define it explicitly.
const password = new random.RandomPassword("password", {
    length: 16,
    special: true,
}).result;

// Create a DigitalOcean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: digitalocean.Regions.NYC1, // Choose the region that is closest to you or your users
    version: "1.21.5-do.0", // Use the version that suits your needs
    nodePool: {
        name: "default",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB, // Choose the size that fits your expected workload
        nodeCount: 1, // Start with 1 node, can be scaled as needed
    },
});

// Get the kubeconfig from the created DigitalOcean Kubernetes Cluster
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a provider for the above Kubernetes cluster
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Define the servicemesh-k8ssandra-resource Helm chart and its release.
const chartName = "servicemesh-k8ssandra-resource";
const servicemeshChart = new k8s.helm.v3.Chart(chartName, {
    chart: chartName,
    version: "0.1.0", // Specify the exact chart version you want to deploy
    // Values for the Helm chart are set according to your needs.
    values: {
        service: {
            type: "ClusterIP",
        },
        // Add any other required values here
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the Helm chart status
export const kubeconfigOutput = pulumi.secret(kubeconfig);
export const isHelmChartDeployed = servicemeshChart.status;

// Access the cluster using kubectl or any other K8s management tool with the exported `kubeconfig`.
```

**Explanation:**

- We first import the necessary Pulumi packages for interacting with DigitalOcean, Kubernetes resources, and generating random passwords.
- A DigitalOcean Kubernetes cluster is created via `digitalocean.KubernetesCluster`, provisioning it in the region `NYC1` with the Kubernetes version `1.21.5-do.0`, inside which the helm chart will be deployed.
- We retrieve the `kubeconfig` of the created Kubernetes cluster which is needed to communicate with the cluster.
- A Pulumi Kubernetes provider `k8s.Provider` is instantiated to use the `kubeconfig`, enabling Pulumi to deploy resources onto that cluster.
- We define the helm chart deployment using the `k8s.helm.v3.Chart` class, providing it the `chartName`, the chart `version`, and custom `values` that might be necessary for the chart deployment, all in the context of the created Kubernetes provider.
- Finally, we export the computed Kubernetes `kubeconfig` and the helm chart deployment status for use outside of Pulumi.

**Next Steps:**

- Install Pulumi and set up your Pulumi account.
- Install Node.js and the Yarn package manager.
- Set up `doctl`, the DigitalOcean command-line tool, and authenticate it with your DigitalOcean account.
- Create a new Pulumi TypeScript project and add the above code in the `index.ts` file.
- Run `pulumi up` to execute the Pulumi code and deploy the Kubernetes cluster and helm chart.
- Use the exported kubeconfig to interact with your cluster via kubectl or any Kubernetes management tools.