Deploy the url-shortener helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy a Helm chart on an OpenShift cluster using Pulumi, we'll need to use the Kubernetes provider and the Helm-related resources within it. We need to instantiate a Helm chart resource within our Pulumi program and specify the appropriate Helm repository where our chart is located.

As OpenShift is a Kubernetes distribution, you will need to make sure that your Kubernetes cluster context is correctly set to point to your OpenShift cluster. The following program assumes that you have already set up kubectl to communicate with your OpenShift cluster, and you can interact with your cluster without any issues.

Let's go through a step-by-step guide to deploying the url-shortener Helm chart on OpenShift:

Setting up the Pulumi Project: You'll need to create a new Pulumi project using Pulumi's CLI tool. This will initialize a new project for your infrastructure code.
Install Dependencies: You'll need to install necessary dependencies in your project, including the Pulumi Kubernetes package.
Authoring the Pulumi Program: You write a program to define the infrastructure. In this case, the infrastructure is the Helm release for the url-shortener application.
Deploying the Application: You run pulumi up to deploy your Helm chart on OpenShift.

Now, here's a TypeScript program that accomplishes this task:

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

// Create an instance of the kubernetes provider configured for the OpenShift cluster.
const openshiftProvider = new k8s.Provider("openshift", {
    // The kubeconfig file should automatically detect and authenticate with OpenShift.
    // Ensure that the environment or Pulumi config contains the correct kubeconfig.
});

// Define the URL Shortener Helm chart deployment.
const urlShortenerChart = new k8s.helm.v3.Chart("url-shortener", {
    // Specify the chart, version, and repository where your Helm chart can be found.
    chart: "url-shortener",
    version: "<YOUR_CHART_VERSION>", // Replace with the desired version of the chart
    fetchOpts: {
        // Specify the repository URL of the url-shortener chart
        repo: "https://charts.example.com/", // Replace with the actual Helm chart repository URL
    },
    // Define the namespace where this Helm chart should be deployed.
    namespace: "default",
    // You can provide custom values to the chart by specifying the 'values' attribute here.
    values: {
        // Default values are used for this chart. Override any values you need to.
    },
}, { provider: openshiftProvider });

// Export the URL to the url-shortener service, assuming it is of type LoadBalancer.
// You might need to adapt this to how your url-shortener Helm chart exposes its service.
export const url = urlShortenerChart.getResource("v1/Service", "url-shortener").status.apply(s => s.loadBalancer.ingress[0].ip);

This program does the following:

It creates a Kubernetes provider that is configured to talk to your OpenShift cluster. Pulumi respects the kubeconfig settings, so it should automatically target your OpenShift cluster if your kubeconfig does so.
A Helm Chart resource is defined, which tells Pulumi to deploy the url-shortener Helm chart. You need to specify the chart name, version, and repository URL.
The program exports the LoadBalancer IP that the deployed service uses. This line might need to be adjusted depending on how your particular Helm chart exposes its service.

Please replace "<YOUR_CHART_VERSION>" with the version of the chart you wish to deploy and "https://charts.example.com/" with the URL to the Helm repository hosting your chart.

Once you have your Pulumi program, you can run pulumi up to deploy it to your OpenShift cluster.

Remember that this is a basic deployment, and Helm charts often require additional configuration. Examine the values array in your Helm chart to see which values you can override for your use case. You would typically pass these values in the values object in the Pulumi program.