Deploy the kubescape-prometheus-integrator helm chart on Linode Kubernetes Engine

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Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster involves a few steps. We will first ensure that we have a Kubernetes cluster up and running. Then, we will install the Helm chart on that cluster. Since we're going to deploy on the Linode Kubernetes Engine (LKE), I'll show you how to set up the cluster on Linode and then deploy the `kubescape-prometheus-integrator` Helm chart using Pulumi with TypeScript.

Before you start with the deployment, make sure you have the following prerequisites on your local development machine:

- Pulumi CLI installed
- Linode CLI with a generated token that has permissions to create Kubernetes clusters
- Helm CLI for working with Helm charts
- `kubectl` CLI for interacting with the Kubernetes cluster
- Configured access to the Linode account via the CLI

Now let's proceed with the implementation:

1. **Create a Kubernetes Cluster on Linode**: We define a Pulumi program to provision an LKE cluster. We won't provide a detailed walkthrough on how to create a Linode Kubernetes cluster as this will focus on deploying the Helm chart.

2. **Deploy the Helm Chart**: After the cluster is provisioned, we will use the Pulumi Kubernetes provider to deploy the `kubescape-prometheus-integrator` Helm chart.

3. **Configure the Helm Chart**: If necessary, we can pass custom configuration values to the Helm chart by using the `values` property.

Below is a TypeScript program that implements the deployment. It assumes you are already logged into the Linode CLI and Pulumi CLI with the necessary credentials.

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

// Step 1: Provisioning the Linode Kubernetes cluster is omitted for brevity

// Step 2: Deploy the kubescape-prometheus-integrator Helm chart
const kubescapePrometheusChart = new kubernetes.helm.v3.Chart("kubescape-prometheus-integrator", {
    chart: "kubescape-prometheus-integrator",
    version: "1.0.0", // Replace with the actual chart version
    fetchOpts: {
        repo: "https://charts.your-repository.com/", // Replace with the actual helm chart repository URL
    },
    // If needed, add custom values for the Helm chart here
    values: {
        // Custom configuration values for kubescape-prometheus-integrator chart
    },
});

// Obtaining a kubeconfig to interact with the provisioned cluster
// This step assumes the LKE cluster is already created and available
const kubeconfig = linodeKubernetesCluster.kubeconfig.apply(JSON.stringify);

// Export the kubeconfig to a file
export const exportedKubeconfig = pulumi.all([kubeconfig]).apply(([kc]) => {
    require('fs').writeFileSync('kubeconfig-linode.json', kc, 'utf-8');
    return kc;
});

// Step 3: Use 'kubectl' with the exported kubeconfig to interact with the cluster
```

In the `exportedKubeconfig` bit, we're taking the kubeconfig that Linode provides us and writing it to a local file so it can be used with the `kubectl` command-line tool. You can then use `kubectl --kubeconfig kubeconfig-linode.json get pods` to interact with your cluster.

Remember that we've used placeholders for certain values such as the chart's version and chart repository URL. You'll need to replace them with the appropriate details for `kubescape-prometheus-integrator`.

**Important Notes:**

- The Helm chart name and version need to match what’s available in the repository.
- Helm repository where your `kubescape-prometheus-integrator` chart is hosted should be specified in `fetchOpts.repo`. If the chart is in a private repository, you will need to add appropriate credentials.
- Custom configurations for your Helm chart should be set in the `values` object within the chart definition.

After writing this program, run the following commands to execute it:

```bash
pulumi up # to create the resources
pulumi stack output exportedKubeconfig # to view the kubeconfig
```

The making of the kubeconfig file in this example lets you use it with `kubectl` if you want to interact with your Kubernetes cluster. It's crucial to secure your kubeconfig file and handle it carefully to avoid unauthorized access to your Kubernetes cluster.