Deploy the laravel-helm helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy a Helm chart on an OpenShift cluster using Pulumi, you would typically use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider. This resource allows you to deploy applications packaged as Helm charts onto a Kubernetes cluster. Since OpenShift is a Kubernetes distribution, deploying Helm charts on OpenShift follows a similar pattern to deploying on a standard Kubernetes cluster.

The primary differences when working with OpenShift may include the need to provide additional authentication configuration, and consideration for OpenShift's specific security and project (namespace) structures.

In the example below, I'm going to assume that you've already set up your `kubeconfig` file to point to your OpenShift cluster. This configuration allows Pulumi to authenticate to your cluster. You'll also need to ensure that `helm` is available in your environment as Pulumi's Helm support uses the Helm CLI to deploy charts.

Here is a detailed explanation with the program written in TypeScript:

### Pulumi Program to Deploy a Helm Chart on OpenShift

1. First, you ensure that you have imported the necessary packages for Kubernetes and OpenShift in your Pulumi program.
2. Define the chart from the Helm repository that you wish to deploy. In this case, it is the `laravel-helm` chart, which you might find in a Helm repository.
3. You specify the values that need to be configured for the Laravel application, based on the Helm chart's `values.yaml` file.
4. Deploy the Helm chart to your OpenShift cluster in the desired namespace.

Before running the following program, make sure you have Pulumi installed and configured for TypeScript, and that you have access to an OpenShift cluster.

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

// Define the settings for the laravel-helm chart.
// Replace `REPO_URL` with the actual repository URL where the laravel-helm chart is hosted.
// You will need to know the version of the chart and the values it accepts for configuration.
const laravelHelmChart = new k8s.helm.v3.Chart("laravel-chart", {
    chart: "laravel-helm",
    version: "CHART_VERSION", // Specify the chart version.
    fetchOpts: {
        repo: "REPO_URL", // Specify the Helm chart repository URL.
    },
    namespace: "NAMESPACE", // Replace with the namespace where you want to deploy.
    values: {
        // Specify the values for the chart, such as image settings, environment variables, etc.
        // This is specific to the Helm chart and should match the chart's expected configuration.
        // For example:
        // image: "IMAGE_URL", // Specify the Docker image URL for Laravel if needed.
        // env: {
        //     APP_KEY: "YourAppKeyHere",
        //     APP_ENV: "production",
        //     // Add other environment variables as required by the Helm chart.
        // },
    },
    // If needed, you can add transformations to modify the resources before they are applied to the cluster.
    // transformations: [
    //     (obj: any) => {
    //         // Modify the obj as needed.
    //     },
    // ],
}, { provider: openShiftProvider }); // If you have a specific provider instance for OpenShift, specify it here.

// Exporting the Laravel application URL, if it creates an external endpoint.
export const laravelUrl = laravelHelmChart.getResourceProperty("v1/Service", "laravel-service", "status")
    .apply(status => `http://${status.loadBalancer.ingress[0].hostname}`);
```

In this program:
- We initialize a new Helm chart resource using `new k8s.helm.v3.Chart`.
- We specify the name of the Helm release as `"laravel-chart"`.
- `chart` specifies the name of the Helm chart we wish to deploy (`"laravel-helm"` in this case).
- `version` is the version of the Helm chart that you want to deploy. You need to replace `"CHART_VERSION"` with the actual version number.
- `fetchOpts.repo` contains the URL to the Helm repository that hosts the `laravel-helm` chart. Replace `"REPO_URL"` with the actual repository URL.
- `namespace` is the OpenShift project (namespace) where the Helm chart will be deployed. Replace `"NAMESPACE"` with your desired namespace.
- The `values` field is a map representing the `values.yaml` file used to configure the Helm chart during deployment. Replace the comments and placeholders with actual configuration values.
- `transformations` is an optional field you can use to modify the Kubernetes resources before they are applied to the cluster.
- `provider: openShiftProvider` is commented out, but you can provide a specific Pulumi provider instance if you're using multiple clusters or special authentication.

Lastly, we export the URL where the Laravel application will be available. The `getResourceProperty` call is used to extract the hostname from the LoadBalancer service created by the Helm chart.

Please ensure you have the correct version of the Helm chart and the repository URL. Also, replace the `values` with the desired configuration specific to the `laravel-helm` Helm chart. If the `laravel-helm` chart is not available in a public repository, you may need to download it and specify a local path or add custom repository credentials.

Before running the code with `pulumi up`, make sure you have logged into your OpenShift cluster using `oc login` or have a valid `kubeconfig` file.