Deploy the onlinejudge helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart on a Kubernetes cluster using Pulumi, you will use the `Chart` resource from the Pulumi Kubernetes provider. This resource allows you to declare a Helm chart as part of your Pulumi infrastructure as code.

The `Chart` resource encapsulates a Helm chart's deployment, a collection of pre-configured Kubernetes resources, services, and controllers. Helm streamlines the installation and management of Kubernetes applications. By using Pulumi to manage Helm charts, you can leverage Pulumi's programming model to configure your applications programmatically.

Here's a step-by-step TypeScript program that demonstrates how to deploy the "onlinejudge" Helm chart on a Kubernetes cluster. We'll assume that the chart is available in a known Helm chart repository. If you don't have a specific repository, we'll use a placeholder URL.

Before running the Pulumi program, ensure you have the following prerequisites:
1. Pulumi CLI installed.
2. Kubernetes cluster configured and `kubeconfig` file is set up correctly.
3. Access to a terminal or command prompt to execute the Pulumi commands.

Now, let's break down the program:

1. We start by importing the necessary Pulumi and Kubernetes packages.
2. We then create an instance of the `Chart` resource, specifying the chart name, the repository where it's located, any custom values you wish to apply, and the namespace where it should be deployed.

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

// Deploy the onlinejudge Helm chart into the `onlinejudge-ns` namespace.
const onlinejudgeChart = new k8s.helm.v3.Chart("onlinejudge", {
    chart: "onlinejudge",
    version: "1.0.0", // Replace with the actual chart version
    repositoryOpts: {
        repo: "http://repository-url/charts", // Replace with the actual repository URL
    },
    namespace: "onlinejudge-ns", // Specify the namespace to deploy to, create it if it doesn't exist.
    // If there are custom values you wish to override, specify them here.
    // For example, if you have a values.yaml file, you can include its contents as an object.
    values: {
        // Include your custom values like this key-value pair
        // key: value,
    },
    // The `skipAwait` option, when set to true, tells Pulumi not to wait for all resources created by the chart to become available.
    skipAwait: false,
});

// Optional: Export the name of the namespace
export const namespaceName = onlinejudgeChart.namespace;
```

In the above code:
- `"onlinejudge"` is the name of the Helm chart we want to deploy.
- `version` specifies the version of the chart you want to deploy. Replace `"1.0.0"` with the actual version number required.
- `repositoryOpts` contains the `repo` field where you will place the URL of the Helm repository.
- `namespace` specifies the Kubernetes namespace where you want to deploy the chart. This namespace will be created if it does not exist.
- The `values` object allows you to override default chart values with your own custom configuration. Here you can define your configuration as key-value pairs.
- `skipAwait: false` tells Pulumi to wait for all resources to be available before considering the operation successful.

To execute the Pulumi program, you would perform the following steps in your terminal:

1. Navigate to the directory with your Pulumi TypeScript program.
2. Run `pulumi up` to preview and deploy the changes.

After running `pulumi up`, Pulumi will show a preview of the resources that will be created. If everything looks correct, proceed with the deployment by confirming the action in the terminal.

Please note that to successfully deploy the Helm chart, the Kubernetes cluster must be accessible with a valid `kubeconfig` file, and the Helm repository with the `onlinejudge` chart must exist and be reachable.