Deploy the application-migration helm chart on Kubernetes

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster using Pulumi involves using the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider. This resource allows you to install, update, and manage Helm charts.

Here's a program that will deploy an `application-migration` Helm chart to a Kubernetes cluster. The program assumes that you have a Kubernetes cluster already configured and that Pulumi has the necessary access to deploy resources to it. The Helm chart would be sourced from the default Helm chart repository, but you can specify a different repository by setting the `repo` argument if needed.

I'll explain the steps involved in the program:

1. Import the necessary Pulumi and Kubernetes libraries.
2. Instantiate the `Chart` resource with the Helm chart you wish to deploy. In this case, it's an `application-migration` chart.
3. Optionally set values for the Helm chart, for example, to customize the deployment.
4. (Not shown in the program) Run `pulumi up` to preview and deploy your changes.

Here's the TypeScript program to do this:

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

// Create a Helm Chart resource for the 'application-migration' chart.
// Replace 'my-namespace' with the namespace you want to deploy the chart into.
// If the chart requires custom values, specify them in the 'values' object.
const appMigrationChart = new k8s.helm.v3.Chart('application-migration', {
  chart: 'application-migration',
  // Uncomment and set the `repo` property to the URL of the repository
  // if your Helm chart is not in the default repository.
  // repo: 'https://charts.example.com/',
  namespace: 'my-namespace', // Ensure this namespace exists in your cluster
  // values: { /* Custom values for the chart */ },
}, { provider: k8sProvider }); // Ensure you have a provider configured if not using the default one

// The `appMigrationChart` now represents the Helm deployment of the application-migration chart.
// Pulumi will manage the lifecycle of the chart as defined in your code.

export const chartName = appMigrationChart.chart;
```

This program creates an instance of the 'application-migration' Helm chart and deploys it to the Kubernetes cluster in the namespace 'my-namespace'. Ensure that you replace `'my-namespace'` with the appropriate Kubernetes namespace where you want the chart to be deployed. Additionally, I've commented on the `values` property for adding custom values and the `repo` property for specifying a custom Helm chart repository. Uncomment and update these as necessary for your deployment.

To run this Pulumi program, save the code to a file named `index.ts` (or any other name you prefer), and then execute the following commands in the terminal:

```sh
pulumi stack init dev  # Creates a new stack named 'dev' (or use an existing one)
pulumi up              # Preview and deploy the changes
```

When you run `pulumi up`, Pulumi will perform a preview showing you what actions it will take to reach the desired state described by your program. After reviewing the changes, confirm the deployment to allow Pulumi to deploy the Helm chart to your Kubernetes cluster.