Deploy the app-nginx helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `app-nginx` Helm chart on an OpenShift cluster using Pulumi, we'll be utilizing the `kubernetes.helm.v3.Chart` resource from Pulumi's Kubernetes provider. The `Chart` resource allows us to deploy a Helm chart into a Kubernetes cluster. With Pulumi and its Kubernetes provider, you can describe your Helm chart deployment in code and manage it alongside other infrastructure as code.

Before we dive into the code, make sure you have the following setup:

1. An existing OpenShift cluster where you want to deploy the Helm chart.
2. `kubectl` configured to connect to your OpenShift cluster.
3. The Pulumi CLI installed on your local machine.
4. A Pulumi account where you can manage your projects and stacks.

Here's the TypeScript program that defines the deployment of the `app-nginx` Helm chart:

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

// Define the settings for our Helm chart.
const nginxChart = new k8s.helm.v3.Chart('app-nginx', {
  // Replace with the actual repository that contains the 'app-nginx' chart.
  repo: 'my-chart-repo',
  chart: 'app-nginx',
  // Specify the version of the chart if necessary.
  version: '1.2.3',
  // Set the values for the Helm chart.
  values: {
    // Provide any values required by the 'app-nginx' chart.
    // For example:
    // service: {
    //   type: 'LoadBalancer',
    // },
  },
  // Define the namespace to deploy the Helm chart to.
  namespace: 'my-namespace',
});

// Export the base URL for the deployed 'app-nginx'. This assumes
// that your chart exposes a service and you are deploying a LoadBalancer service type.
export const nginxUrl = nginxChart.getResourceProperty('v1/Service', 'app-nginx', 'status').then(status => {
  return status.loadBalancer.ingress[0].hostname;
});
```

Here's what the code does:

- We're importing the Kubernetes package from Pulumi's library, which provides us with the necessary resources to interact with Kubernetes clusters.

- We create a new Helm chart deployment by instantiating the `Chart` resource. We name this instance `app-nginx`.

- The `repo` field specifies the Helm chart repository that contains your `app-nginx` chart. You need to replace `my-chart-repo` with the actual repository name or URL.

- The `chart` field specifies the name of the chart to deploy.

- If your Helm chart has a specific version you require, you can specify it with the `version` field.

- The `values` field is where you can provide any overrides to the default values that the Helm chart uses. Typically, this is where you set configuration like service types, ports, image settings, and so on.

- We specify the Kubernetes namespace with the `namespace` field into which the Helm chart should be deployed. In this example, it's set to `my-namespace`.

- The last part of the program tries to export the URL of the deployed Nginx service which would be running inside the cluster. However, this assumes that the Nginx service is exposed via a LoadBalancer with an externally accessible IP or hostname. If your OpenShift installation doesn't support LoadBalancer services or if your service is exposed differently, you'll need to adapt this code accordingly.

Finally, to run this Pulumi program, you need to perform a few steps in your development environment:

1. Navigate to the directory where you would like to keep this project.
2. Run `pulumi new typescript` to create a new Pulumi TypeScript project.
3. Install the `@pulumi/kubernetes` package with `npm install @pulumi/kubernetes`.
4. Place the above TypeScript code into the `index.ts` file that Pulumi generates.
5. Run `pulumi up` to preview and deploy the changes.

Please ensure that your OpenShift cluster is configured correctly and that Pulumi has access to deploy resources into it. Depending on your cluster's authentication setup, you might need to set up additional provider configuration for Pulumi to interact with your cluster.