Deploy the openweathermap-exporter helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

In order to deploy the `openweathermap-exporter` Helm chart on Linode Kubernetes Engine (LKE) using Pulumi, we'll follow a two-step process:

1. Set up a Kubernetes cluster on Linode using Pulumi.
2. Deploy the `openweathermap-exporter` Helm chart to the cluster.

For the first step, you would typically use Linode's own Pulumi provider to create a Kubernetes cluster. However, as of my knowledge cutoff in March 2023, Linode does not have a dedicated Pulumi provider for this purpose. Instead, you would use Linode's Cloud Manager or CLI to set up the Kubernetes cluster.

Once your Kubernetes cluster is available, you can use Pulumi with the Kubernetes provider to deploy the `openweathermap-exporter` Helm chart to your cluster. To do this, you will need to configure Pulumi to use the kubeconfig file that Linode provides for your Kubernetes cluster.

Below is a Pulumi program written in TypeScript that demonstrates how to deploy a Helm chart to an existing Kubernetes cluster:

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

// Assume that the kubeconfig file is obtained from Linode after the LKE cluster is created
// and it has been configured with Pulumi. The path would usually be "~/.kube/config".
// The kubeconfig file would contain the necessary details to connect to your LKE cluster.

// OpenWeatherMap Exporter Helm Chart information
const chartName = "openweathermap-exporter";
const chartVersion = "X.Y.Z"; // replace with a specific chart version
const chartRepo = "https://helm-repo-url/"; // replace with the actual Helm repo URL

// Deploy the `openweathermap-exporter` Helm chart
const openweathermapExporter = new k8s.helm.v3.Chart("openweathermap-exporter", {
    chart: chartName,
    version: chartVersion,
    fetchOpts: {
        repo: chartRepo,
    },
    // Additional configuration for the chart can be specified via the `values` property.
    // For example, if you have an API key for OpenWeatherMap and specific configuration,
    // you would specify it here.
    values: {
        // apiKey: "your-openweathermap-api-key",
        // ...other configuration values...
    },
});

// Export the name of the Helm release
export const releaseName = openweathermapExporter.metadata.name;
```

To run this program:

1. Save this code in a file named `index.ts`.
2. Run `pulumi up` in the command line from the directory where you saved your `index.ts`. This will start the deployment process. Pulumi will show you a preview of the resources that will be created and ask for confirmation before proceeding.

Please note that you need to replace `chartVersion` with the version of the Helm chart you want to deploy, and `chartRepo` with the URL of the Helm repository that contains the `openweathermap-exporter` chart.

Also, `values` property is currently commented out – if you have specific configuration parameters for the `openweathermap-exporter` chart (like an API key), you would uncomment this section and provide the necessary values.

The `export const releaseName` line at the end of the code allows you to output the name of the Helm release once it's deployed, which is useful for reference. Once the deployment is complete, you'll see the release name in the outputs section of your terminal.