Deploy the stress helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the stress Helm chart on the Linode Kubernetes Engine (LKE), you will need to do the following steps:

1. Set up a Linode Kubernetes cluster. For this, you would typically use the Linode Cloud Controller to provision the cluster. However, as we're focusing solely on Pulumi, we will not cover the cluster creation process here, and it's expected that you have already provisioned an LKE cluster.

2. Configure your local environment to have access to your LKE cluster. This usually involves configuring `kubectl` with the appropriate credentials, which you can retrieve from the Linode Cloud Manager. Ensure `kubectl` can communicate with your LKE cluster before proceeding further.

3. Next, you'll use Pulumi with the `kubernetes` package to deploy the stress Helm chart. You will need to write a Pulumi program in TypeScript to achieve this.

Below is a program written in TypeScript that uses Pulumi to deploy a Helm chart to your LKE cluster. The `kubernetes` package provides the necessary resources to work with Kubernetes resources, including Helm charts.

This program assumes that:

- You have already installed Pulumi CLI and have an LKE cluster running.
- You have configured `kubectl` with your LKE cluster credentials and can access your cluster.
- Helm and the stress chart are available in the Helm repository that you specify.

Now, let's get into the code:

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

// The name of the Helm chart we want to deploy.
const chartName = "stress";

// The repository where the Helm chart is located.
const chartRepository = "https://example.com/helm/charts"; // Replace with the actual repository URL.

// The version of the Helm chart you want to deploy.
const chartVersion = "1.0.0"; // Change this to the desired chart version.

// Define the Helm chart resource that Pulumi will deploy.
const stressHelmChart = new kubernetes.helm.v3.Chart("stress-helm-chart", {
    chart: chartName,
    version: chartVersion,
    fetchOpts: {
        repo: chartRepository,
    },
    // Specify any additional configuration for the chart.
    values: {
        // These are example values that you might need to modify or extend 
        // based on the configuration options of the stress Helm chart.
        replicaCount: 1,
        resources: {
            limits: {
                cpu: "100m",
                memory: "128Mi",
            },
            requests: {
                cpu: "50m",
                memory: "64Mi",
            },
        },
    },
});

// Export the name of the cluster namespace the Helm chart is deployed in.
export const namespace = stressHelmChart.namespace;
```

Copy and paste the above code into a file named `index.ts` to represent your Pulumi program. Once placed in the program, Pulumi will handle deploying the Helm chart to your cluster. Ensure the chart repository URL and the chart version are correct (replace the placeholder values with the actual values that correspond to the location and version of the stress Helm chart you wish to deploy).

To deploy this to your LKE cluster, you would typically follow these steps:

1. Navigate to the directory containing your `index.ts` file in the terminal.
2. Run `pulumi up` to preview and deploy your changes.
3. Confirm the deployment in the prompt given by Pulumi.

Please note that this script assumes that you have correctly configured your Pulumi setup to interact with your LKE cluster and that your Pulumi stack is appropriately set up for this operation. The code snippet includes `export const namespace = stressHelmChart.namespace;`, which means after the deployment Pulumi will output the Kubernetes namespace where the Helm chart is deployed.

Remember that this code will make changes to your cloud resources, and running `pulumi destroy` will remove the Helm chart and associated resources from your cluster. Always check the planned changes during the Pulumi preview step carefully before confirming the operation.