Deploy the postgres-with-operator helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart to a Kubernetes cluster in DigitalOcean involves several steps:

1. Setting up a DigitalOcean Kubernetes cluster using Pulumi's DigitalOcean provider.
2. Installing the Helm chart onto the cluster using Pulumi's Kubernetes provider.

Here's a detailed walkthrough:

### Step 1: Define the DigitalOcean Kubernetes Cluster

First, we need to create a Kubernetes cluster in DigitalOcean. To do this with Pulumi, you'll use the `digitalocean.KubernetesCluster` resource. You will define the cluster's name, region, version, node pool, etc.

### Step 2: Install the Helm Chart

After the DigitalOcean Kubernetes cluster is provisioned, we can deploy the `postgres-with-operator` Helm chart. Pulumi's `kubernetes.helm.v3.Chart` resource will help us deploy the chart onto our cluster.

### Step 3: Export the Necessary Information

Finally, it’s good practice to export any endpoints, such as the Kubernetes cluster endpoint, or other relevant data, like the Kubernetes configuration file, which could be used to connect to the cluster using `kubectl`.

Let's put it all together in a Pulumi TypeScript program:

```typescript
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", {
    region: "nyc3", // Example region, change based on your needs
    version: "1.20.2-do.0", // Specify a valid version
    nodePool: {
        size: "s-2vcpu-2gb", // Example size, change based on your needs
        name: "default",
        nodeCount: 3, // Set the number of nodes
    },
});

// Step 2: Use the Pulumi Kubernetes provider to deploy Helm chart
const postgresWithOperatorChart = new kubernetes.helm.v3.Chart("postgres-operator", {
    chart: "postgres-operator",
    version: "1.0.0", // Specify the chart version you want to deploy
    fetchOpts: {
        repo: "https://charts.your-repo.com/", // Replace with the Helm chart repository URL
    },
}, { provider: new kubernetes.Provider("k8s-provider", { kubeconfig: cluster.kubeConfigs[0].rawConfig }) });

// Step 3: Export the cluster endpoint and kubeconfig
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const clusterEndpoint = cluster.endpoint;

```

Explanation:
- We import the necessary Pulumi libraries for DigitalOcean and Kubernetes.
- We create a new DigitalOcean Kubernetes cluster with `digitalocean.KubernetesCluster`. You'll need to specify your region, Kubernetes version, and node pool settings.
- We create a Kubernetes provider (`kubernetes.Provider`) that uses the `kubeconfig` we have from the cluster we created in the previous step.
- We deploy the Helm chart using `kubernetes.helm.v3.Chart`. You'll need to specify the chart's name and version and provide the repository URL where the Helm Chart is located.
- We export the `kubeconfig` and the `cluster.endpoint` for future use, such as connecting to the cluster via `kubectl` or integrating with CI/CD pipelines.

Please make sure that the `chart` string points to the correct Helm chart name for deploying Postgres with an operator, and that the `version` matches the chart version you intend to use. The repository URL should also be updated to point to the actual Helm repository that hosts your desired chart.

Remember to install the Pulumi CLI, configure it with your DigitalOcean access token and have Node.js with NPM in your development environment. Execute `pulumi up` within your project directory to create these resources in your DigitalOcean account.