Deploy the zookeeper-3Nodes helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `zookeeper-3Nodes` Helm chart on Digital Ocean Kubernetes Service using Pulumi, we'll need to perform a few steps:

1. Create a new Kubernetes Cluster in Digital Ocean.
2. Deploy the Helm chart for Zookeeper onto the cluster.

Let's break down the steps involved.

### Step 1: Create a Digital Ocean Kubernetes Cluster

Firstly, we'll create a Kubernetes cluster using the `digitalocean.KubernetesCluster` resource. This will set up a cluster in your specified region with the node pool configuration that you need, such as the number of nodes and the size (the machine type) for each node.

Here's how you do it:

- Import the required Pulumi and Digital Ocean packages.
- Create a Kubernetes cluster.
- Define the node pool with the desired size and number of nodes.

### Step 2: Deploy the Helm Chart

After the cluster is up and running, we can deploy the Zookeeper Helm chart using the `kubernetes.helm.v3.Chart` class from Pulumi's Kubernetes provider. This will pull the chart from the specified Helm chart repository and deploy the resources it describes.

Here's what's needed:

- Import the Pulumi Kubernetes package.
- Wait for the cluster to be ready.
- Use a `Chart` resource to deploy Zookeeper, specifying the chart name and repository.

Now, I'll provide you with the full Pulumi program written in TypeScript to perform these actions.

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

// Step 1: Create a Digital Ocean Kubernetes Cluster
// Define the configuration for the Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Specify your region
    version: "1.21.5-do.0", // Use the version that is available in your region
    nodePool: {
        name: "default-pool",
        size: "s-2vcpu-2gb",
        nodeCount: 3, // Number of nodes, for zookeeper-3Nodes as per the request
    },
});

// Export the kubeconfig and cluster ID
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const clusterId = cluster.id;

// Step 2: Deploy the Helm Chart 'zookeeper-3Nodes' on the cluster
const zookeeperChart = new k8s.helm.v3.Chart("zookeeper-chart", {
    chart: "zookeeper",
    version: "0.1.0", // Replace with the version of the chart you wish to deploy
    // The repository option specifies the Helm chart repository.
    repositoryOpts: {
        repo: "https://charts.helm.sh/stable",
    },
    // Use the generated kubeconfig
    fetchOpts: { kubeconfig },
    // Specify the number of replicas
    values: {
        replicaCount: 3,
    },
}, { provider: new k8s.Provider("do-k8s", { kubeconfig })});

// Export any necessary stack outputs
export const zookeeperEndpoint = zookeeperChart.getResourceProperty("v1/Service", "zookeeper-chart-zookeeper", "status");
```

### How to Use the Provided Code

You would need to follow the steps below:

1. Save the code to a file, for example `index.ts`.
2. Ensure you've Pulumi installed and configured with your Digital Ocean access token.
3. Run `pulumi up` to preview and deploy the changes.

The `kubeconfig` exported will allow you to interact with your Kubernetes cluster using `kubectl` or any Kubernetes-aware tool. The `zookeeperEndpoint` variable is set to export the endpoint of your Zookeeper deployment, which you can use to connect to your Zookeeper cluster.

### Next Steps

As a novice, after deploying the stack, you might want to:

- Check the status of the resources via the Pulumi Console or CLI.
- Investigate the resources created in the Digital Ocean dashboard.
- Learn more about Helm charts and Kubernetes deployments.

Remember, Helm charts can have configuration values you can set to customize your deployment, so you might need to fine-tune the `values` object in the Helm chart deployment to suit the specifics of the `zookeeper-3Nodes` chart.