Deploy the geomapfish helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `geomapfish` Helm chart on a Kubernetes cluster using Pulumi, we will need to use the `@pulumi/kubernetes` package which allows us to interact with Kubernetes resources within Pulumi programs. The resource we will focus on is `Chart`, which represents a Helm chart in the Pulumi Kubernetes provider. Helm charts are a convenient way to package Kubernetes applications, and you can deploy them as units rather than individual Kubernetes resources.

First, we need to install the necessary Pulumi packages for our TypeScript program. Ensure you have Pulumi installed and set up to work with your Kubernetes cluster.

The `@pulumi/kubernetes` package is used to interact with Kubernetes resources, including deploying Helm charts. You can install it using npm or yarn:

```bash
npm install @pulumi/kubernetes
```
or
```bash
yarn add @pulumi/kubernetes
```

Below is the TypeScript program that creates an instance of `Chart` to deploy the `geomapfish` Helm chart. In this example, let's assume that the Helm chart is available in a publicly accessible Helm repository.

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

// Define the settings for the geomapfish Helm Chart
const geomapfishChartSettings = {
    chart: "geomapfish",
    // The repository where the geomapfish Helm chart is hosted.
    // Substitute with the actual URL to the Helm chart repository.
    repo: "https://helm.geomapfish.org",
    // Specify version if you want to pin to a specific chart version.
    version: "2.5.0",
    // You can provide a set of values to configure geomapfish.
    values: {
        // Configurations such as image settings, resource limits, service ports,
        // can be defined here according to the chart's values.yaml schema.
        // This is an example configuration setting; please adjust key-value pairs
        // based on actual configuration options provided by the geomapfish chart.
        someConfiguration: "someValue",
    },
    // Specify the Kubernetes namespace to deploy the Chart in (optional).
    namespace: "default",
};

// Create a Helm Chart instance for geomapfish
const geomapfishChart = new k8s.helm.v3.Chart("geomapfish-chart", geomapfishChartSettings);

// Export the deployment details if needed
export const chartName = geomapfishChart.metadata.apply(m => m.name);
```

This program does the following:
- Imports the `@pulumi/kubernetes` package to manage Kubernetes resources.
- Defines the settings for the `geomapfish` chart, including the location of the Helm repository (`repo`), the version of the chart to deploy (`version`), and any custom configuration values needed (`values`).
- Creates a new `Chart` resource named `"geomapfish-chart"` with the settings we defined.
- (Optional) Exports the name of the chart after deployment so that you can reference or query it via the Pulumi CLI.

To run the program, save it to a file, say `index.ts`, and execute it using the Pulumi command-line tool, assuming you have set up your Pulumi project and stack:

```bash
pulumi up
```

This command will provision the resources defined by the program in your configured Kubernetes cluster. If it's your first time running a Pulumi program, you might need to go through the initial setup with `pulumi login` and `pulumi new`.

For more information on managing Helm charts with Pulumi and the Kubernetes provider, refer to the [Pulumi Kubernetes provider documentation](https://www.pulumi.com/docs/reference/pkg/kubernetes/helm/v3/chart/).