Deploy the keystone helm chart on Kubernetes

Question

Pulumi · Accepted Answer

Deploying a Helm chart using Pulumi is a convenient way to manage Kubernetes applications declaratively. The Helm Chart resource is part of Pulumi’s Kubernetes provider, which allows us to specify Helm charts as part of our infrastructure as code.

Below is a Pulumi program written in TypeScript to deploy the "keystone" Helm chart on a Kubernetes cluster. I'll guide you through each part of the program and explain what it does:

1. We begin by importing the necessary packages from Pulumi and setting up our Kubernetes provider.
2. We use the `Chart` class to create a new Helm chart resource.
3. We specify the details of the Helm chart, such as the name (`"keystone"`), version, and any custom values you want to pass to the chart.

Ensure you have Pulumi installed, as well as access to a Kubernetes cluster where you have the appropriate permissions to deploy resources.

Here's the Pulumi program:

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

// Create a new instance of the "keystone" Helm chart in the "default" namespace
const keystoneChart = new k8s.helm.v3.Chart("keystone", {
    repo: "my-repo", // Replace 'my-repo' with the name of the repository where your chart is located
    chart: "keystone",
    version: "1.0.0", // Specify the version of the chart you want to deploy
    namespace: "default", // Replace with your target namespace, if different
    // If the chart requires any custom value overrides, specify them in 'values'.
    values: {
        // Provide any custom values required for your deployment
        // Example:
        // someValue: "some-override"
    },
});

// Export the Chart's `resourceNames`, which are the names of the Kubernetes resources managed by the Chart
export const chartResources = keystoneChart.getResourceProperty("kubernetes:helm.sh/v3:Chart", "keystone", "resourceNames");

```
In the above program, update the `repo` field with the name of the Helm chart repository where the "keystone" chart is hosted. You should also specify the exact `version` of the chart that you want to deploy. In the `values` object, you can provide any custom values that the Helm chart accepts to configure it according to your needs.

To apply this Pulumi program, save the code in a file with a `.ts` extension, for example, `index.ts`. Use the Pulumi CLI to create a new stack for your project (if you haven't already), and then run `pulumi up` to preview and deploy the changes. Pulumi will show you a preview of the resources that will be created and promptyou for confirmation before making any changes to your cluster.

The `chartResources` export is not strictly necessary, but it is useful for debugging and understanding which resources are managed by the Helm chart in your cluster. These names can be looked up with `kubectl` or other Kubernetes management tools.

Make sure to check the documentation and values file of the Helm chart you want to deploy for any required and optional configuration parameters.