Deploy the postgres-2-s3 helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Kubernetes using Pulumi, you can use the `Chart` resource from the `@pulumi/kubernetes` package. This allows you to deploy Helm charts as if you were using the Helm CLI. The `Chart` resource can be set with various properties such as `chart`, `version`, `repo`, and `values`, which correspond to the usual Helm parameters.

In this example, I'm assuming you want to deploy a `postgres-2-s3` Helm chart. The name suggests this chart might deploy a PostgreSQL database with S3 integration. Since the exact chart isn't listed in the official Helm repository, you may need to provide the specific `repo` URL where the chart is hosted, along with any configurations the chart expects in the `values` object.

The following program demonstrates how you could deploy such a Helm chart on a Kubernetes cluster using Pulumi with TypeScript:

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

const namespace = "default"; // Or any other namespace where you want to deploy the chart
const postgres2S3Chart = new k8s.helm.v3.Chart("postgres-2-s3", {
    namespace: namespace,
    chart: "postgres-2-s3", // Replace with the actual chart name if different
    version: "1.0.0", // Use the specific version of the chart you want to deploy
    repo: "https://charts.example.com/", // Replace with actual Helm repository URL
    values: {
        // Customize these values based on the configurations provided by the chart
        postgres: {
            user: "admin",
            password: "password", // Be sure to use secrets for sensitive information in production
        },
        s3: {
            bucket: "my-s3-bucket-name",
            // Add additional S3 related configurations here
        },
        // Add any other necessary values the chart requires
    },
});

export const chartName = postgres2S3Chart.metadata.name;
```

Let's break down the code:

- We import the `@pulumi/kubernetes` package, which provides us with the classes and functions necessary to interact with Kubernetes resources.

- We define a `namespace` variable (in this case, `default`), which is the namespace where our Helm chart will be deployed in the cluster. The namespace should already exist in the Kubernetes cluster, or you can create it separately with Pulumi if needed.

- We then create a new `Chart` resource with the name "postgres-2-s3". The `chart` property should match the name of the Helm chart you want to deploy. The `version` property is where you specify the version of the Helm chart. The `repo` property is the URL of the Helm repository hosting your chart.

- The `values` property is an object that contains the configuration options provided by the Helm chart. You can set all the necessary parameters here, such as usernames, passwords, and S3 bucket names.

- Finally, we export the name of the chart as a Pulumi stack output, which can be helpful for debugging or referencing the deployed chart within Pulumi.

To run this program:

1. Make sure you have Pulumi installed on your machine.
2. Ensure you have a Kubernetes cluster and your `kubeconfig` is properly set up.
3. Create a new Pulumi TypeScript project or navigate to an existing one.
4. Place the above code in your project's `index.ts` file.
5. Install the necessary npm package by running `npm install @pulumi/kubernetes`.
6. Run `pulumi up` to execute the program and deploy the chart to your cluster.

Please replace the placeholders (like `https://charts.example.com/`, `postgres-2-s3`, and the configurations inside the `values` object) with the actual values appropriate for your Helm chart. If you're handling sensitive data, use Pulumi's secrets management to keep things like passwords secure.