Deploy the dotnet-app helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy a Helm chart on an OpenShift cluster using Pulumi, we will need to use the `kubernetes` package, which provides a comprehensive API for managing Kubernetes resources, including Helm charts through the `kubernetes.helm.v3.Chart` class.

Below, you'll find a step-by-step guide on how to create a Pulumi TypeScript program that deploys the `dotnet-app` Helm chart to an OpenShift cluster. OpenShift is essentially a Kubernetes distribution, so the Kubernetes package in Pulumi is suitable for this task.

Here are the steps that the program will carry out:
1. We will define an instance of `kubernetes.helm.v3.Chart`, which represents a Helm chart resource in a Kubernetes cluster.
2. The Helm chart's `chart` property will refer to the `dotnet-app` chart. You need to have access to the chart's repository or have it locally for Pulumi to deploy it.
3. We'll set the `namespace` to deploy the chart into a specific namespace in OpenShift if desired; otherwise, it will use the default namespace.

Before starting, ensure that you have the Pulumi CLI installed and you're logged into an OpenShift cluster with `kubectl` configured to point to the cluster. You'll also need to have Helm installed if you are going to use a chart from a local path or need to add private repositories. This Pulumi program assumes that `kubectl` is authenticated to an OpenShift cluster and that the Helm chart is accessible.

Here's the Pulumi program in TypeScript:

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

// Create an instance of the kubernetes.helm.v3.Chart class to deploy the dotnet-app Helm chart.
// Make sure that the repository where the dotnet-app chart is located is added to your Helm CLI.
// If the chart is in a public repository such as Helm Hub or your Helm has access to OpenShift's chart repository, specify it in the 'repo' property.

const dotnetAppChart = new kubernetes.helm.v3.Chart("dotnet-app", {
    // Replace with the actual chart name, if different.
    chart: "dotnet-app",

// Specify the chart version if needed. Omit this if you want to use the latest version.
    // version: "1.0.0",

// Specify values to customize the deployment, if necessary.
    // values: {},

// You should already have a namespace created in your OpenShift cluster or you can manage
    // namespaces using Pulumi Kubernetes provider as well.
    namespace: "default", // Set this to the namespace where you want to deploy your chart.

// If the chart is not in a public repository, you can specify fetch options such as 'repo' or 'path'.
    // For example, you might have a private repository or a local path where the chart lives.
    // fetchOpts: {
    //     repo: "http://example.com/custom-charts",
    // },
});

// Export the chart's name and namespace, it will provide outputs once the Pulumi program is deployed and can be used to reference the deployment.
export const chartName = dotnetAppChart.metadata.name;
export const chartNamespace = dotnetAppChart.metadata.namespace;
```

This program defines a new Helm chart resource using Pulumi's Kubernetes provider. Replace `"dotnet-app"` with the actual chart name if it is different or the chart is located in a different repository or a local path.

To deploy this chart to your OpenShift cluster, save the above TypeScript code in a file named `index.ts`. Ensure you have `@pulumi/kubernetes` package installed in your Node.js project:

```bash
npm install @pulumi/kubernetes
```

Then, run `pulumi up` from the command line in the same directory as your `index.ts` file. Pulumi will perform the deployment, and you'll see output in the terminal indicating the progress and result. After the deployment, the exported constants `chartName` and `chartNamespace` will be displayed with the actual values that can be used to interact with the Helm chart deployment in your OpenShift cluster.

Remember to check the chart-specific configurations and customize the `values` property in the `Chart` resource options as required for your deployment needs.