Deploy the observabilitysec helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy a Helm chart on a Linode Kubernetes Engine (LKE) cluster using Pulumi, you will need to have an existing LKE cluster or create one using Pulumi. In this explanation, we'll assume you already have an LKE cluster running and have configured `kubectl` to communicate with your cluster.

We'll also assume you have Helm installed and have added the necessary Helm repository for the `observabilitysec` chart.

Here's a step-by-step guide followed by a Pulumi TypeScript program to deploy the `observabilitysec` Helm chart to your LKE cluster:

1. **Install Pulumi**: Before you begin, make sure you have Pulumi installed on your local machine. Instructions on how to install Pulumi can be found on the [official Pulumi website](https://www.pulumi.com/docs/get-started/install/).

2. **Set Up Pulumi for Linode**: Ensure you have set up Pulumi to work with your Linode account. The provider configuration will require you to have a Linode API token, which you can generate in the Linode Cloud Manager under the 'API Tokens' section.

3. **Create a Pulumi Project**: If you haven't already created a Pulumi project, you can do so by running `pulumi new typescript` in your terminal and following the prompts.

4. **Write the Deployment Code**: Write the Pulumi program that defines the Helm chart deployment. We'll be using the high-level Pulumi component named `Chart` from the `@pulumi/kubernetes/helm/v3` package.

5. **Deploy to LKE**: After writing the program, you can deploy the Helm chart to your LKE cluster by running `pulumi up` from your terminal.

Below is the Pulumi TypeScript program for deploying the `observabilitysec` Helm chart:

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

// Initialize a Kubernetes provider using the default kubeconfig file location
const provider = new k8s.Provider("k8s-provider", {
    kubeconfig: "~/.kube/config",
});

// Information about the Helm chart to deploy
const chartName = "observabilitysec";
const chartVersion = "1.0.0"; // Replace with the correct chart version
const repositoryUrl = "https://example.com/helm/repo"; // Replace with the actual Helm repository URL

// Deploy the Helm chart using the Chart resource
const observabilityChart = new k8s.helm.v3.Chart(chartName, {
    repo: repositoryUrl,
    chart: chartName,
    version: chartVersion,
    // Add any custom values file content here or configuration overrides if required
    values: {},
}, { provider });

// Export the URL through which the observability chart can be accessed
// This assumes your chart creates a service with an external IP or hostname
export const observabilityUrl = observabilityChart.getResourceProperty("v1/Service", chartName, "status").apply(status => status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip);
```

This program:

- Imports the Pulumi Kubernetes package which contains the necessary components to interact with Kubernetes.
- Sets up a Kubernetes provider that connects to an LKE cluster using the kubeconfig file typically found at `~/.kube/config`.
- Defines the Helm chart details, such as `chartName`, `chartVersion`, and `repositoryUrl`.
- Deploys the Helm chart to the LKE cluster with the `Chart` resource. The values specified in the `values` object will override default values in the Helm chart, and you can specify them based on your requirements.
- Optionally exports a URL that might be used to access services deployed by the Helm chart, depending on if your Helm chart creates a Kubernetes service with an externally accessible IP or hostname.

Remember to replace the `chartVersion` and `repositoryUrl` with the correct information as required by the `observabilitysec` Helm chart. If your Helm chart requires specific configuration overrides or values, you can place them inside the `values` object.

To deploy this program, navigate to your Pulumi project in the terminal, and then run `pulumi up`. Pulumi will perform a preview of the resources to be created and then prompt you to confirm that you want to deploy the changes. Confirm the deployment, and Pulumi will deploy the `observabilitysec` Helm chart to your LKE cluster.