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

Question

Pulumi · Accepted Answer

To deploy the ZooKeeper Helm chart on a DigitalOcean Kubernetes cluster using Pulumi, you'll follow these steps:

1. Create a new DigitalOcean Kubernetes cluster or use an existing one.
2. Deploy the ZooKeeper Helm chart to the cluster.

We'll construct a Pulumi program in TypeScript that executes these steps. We'll utilize two main resources for this: `digitalocean.KubernetesCluster` to create the Kubernetes cluster and `kubernetes.helm.sh/v3.Chart` to deploy the ZooKeeper Helm chart onto the cluster.

The `digitalocean.KubernetesCluster` resource will set up a new Kubernetes cluster on DigitalOcean Cloud, specifying the region, version, and node configuration that you want to use.

The `kubernetes.helm.sh/v3.Chart` resource is a Pulumi component that represents a Helm chart within a Pulumi program. It enables you to deploy packaged applications (depicted as Helm charts) into a Kubernetes cluster. A Helm chart is a collection of pre-configured Kubernetes resources that are deployed as a single unit. In this case, we will deploy the ZooKeeper Helm chart.

Below is a comprehensive program that creates a new DigitalOcean Kubernetes cluster and deploys the ZooKeeper Helm chart onto it. Before running the following program, make sure to install the necessary Pulumi providers and set up your DigitalOcean access token for Pulumi to use. You'll also need to have `kubectl` and Helm CLI tools installed to interact with the cluster.

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

// Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "latest",
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb",
        nodeCount: 2, // Specify the number of nodes.
    },
});

// Obtain the Kubeconfig from the DigitalOcean Kubernetes cluster
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a Kubernetes provider instance using the obtained kubeconfig
const k8sProvider = new k8s.Provider("do-k8s", {
    kubeconfig: kubeconfig,
});

// Define the repository where the ZooKeeper Helm chart is located
const zookeeperRepo = "https://charts.bitnami.com/bitnami";

// Deploy ZooKeeper Helm chart into the DigitalOcean Kubernetes cluster using the Helm Chart resource
const zookeeperChart = new k8s.helm.sh.v3.Chart("zookeeper", {
    chart: "zookeeper",
    version: "7.1.0", // Specify the version of the ZooKeeper Helm chart
    fetchOpts: {
        repo: zookeeperRepo,
    },
}, { provider: k8sProvider });

// Export the Kubeconfig and the ZooKeeper service endpoint
export const kubeconfigRaw = kubeconfig;
export const zookeeperEndpoint = pulumi.interpolate`http://${zookeeperChart.getResourceProperty("v1/Service", "zookeeper", "status").loadBalancer.ingress[0].ip}`;
```

In this program:

- We define a DigitalOcean Kubernetes cluster named `do-cluster`. This cluster is configured with one node pool consisting of two nodes of size `s-1vcpu-2gb`.
- We retrieve the raw kubeconfig for the cluster. This kubeconfig is utilized to communicate with the Kubernetes cluster using `kubectl`.
- We create an instance of the Kubernetes provider using the kubeconfig. This provider is responsible for provisioning resources in our Kubernetes cluster.
- We define a Helm chart resource called `zookeeper` and specify the version of the chart to use. We also pass the Kubernetes provider we created to this resource so that it knows how to communicate with the specific cluster.
- The `zookeeperRepo` is defined with the URL of the Bitnami chart repository, which hosts the ZooKeeper Helm chart.

After executing this code with Pulumi (`pulumi up`), you will have a Kubernetes cluster on DigitalOcean with the ZooKeeper Helm chart deployed. You can access the cluster with `kubectl` using the exported kubeconfig, and the ZooKeeper service will be accessible at the emitted load balancer IP address.

Remember to replace the region, node sizes, and the Helm chart version to fit your specific use case, as these values might change over time or depending on your requirements.