Deploy the vulnerable-log4j helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `vulnerable-log4j` Helm chart on the Linode Kubernetes Engine using Pulumi, you will need to follow these steps with appropriate Pulumi code:

1. **Set up Linode Kubernetes Engine (LKE) Cluster**: You will need to create an LKE cluster instance using Pulumi's Linode provider.

2. **Install Helm and the Helm Chart**: The Helm chart will be installed on your LKE cluster. Pulumi's Kubernetes provider offers the `helm.v3.Chart` resource, which simplifies the deployment of Helm charts.

3. **Deploy the Chart**: With Pulumi, you code the deployment in TypeScript and then use Pulumi's CLI to deploy the chart to your cluster.

Below is a TypeScript program that achieves that. The program assumes that you have:

- Pulumi CLI and NPM installed.
- Linode API token for Pulumi to authenticate Linode requests.

First, you would need to install the necessary npm packages:

```bash
npm install @pulumi/pulumi @pulumi/linode @pulumi/kubernetes
```

Here's the Pulumi TypeScript program for creating an LKE cluster and deploying the `vulnerable-log4j` Helm chart onto it:

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

// Step 1: Create a Linode Kubernetes Engine (LKE) cluster.
const cluster = new linode.LkeCluster('my-cluster', {
    k8sVersion: '1.22', // Ensure you're using a compatible Kubernetes version for your Helm chart.
    region: 'us-central', // Specify a region where LKE is available.
    pools: [{
        type: 'g6-standard-2', // Choose the type of Linode instances for the nodes.
        count: 3, // The number of nodes in the node pool.
    }],
});

// Add a Kubernetes Provider to Pulumi, informing it how to communicate with the LKE cluster.
const k8sProvider = new k8s.Provider('k8s-provider', {
    kubeconfig: cluster.kubeconfig,
});

// Step 2: Deploy the `vulnerable-log4j` Helm chart on your LKE cluster.
const helmChart = new k8s.helm.v3.Chart('vulnerable-log4j-chart', {
    chart: 'vulnerable-log4j', // The name of the chart. This assumes the chart is available in the default repositories.
    values: { // You would populate this with the values you want to configure in your Helm chart.
        // ...
    },
    namespace: 'default', // Target namespace for the Helm chart.
}, {provider: k8sProvider}); // Ensures that Pulumi uses the created LKE cluster for this deployment.

export const kubeconfig = cluster.kubeconfig; // Exports the cluster's kubeconfig for manual use if necessary.
```

Make sure you replace the chart name `vulnerable-log4j` with the appropriate chart name and repository if it’s not available in the default repositories. Additionally, the `values` should be updated according to the Helm chart's configurable options.

To deploy this, save the code in a file named `index.ts`, and run the following commands:

1. `pulumi stack init` to initialize a new stack.
2. `pulumi up` to provision the resources and deploy the Helm chart to your LKE cluster.

Remember to carefully review the execution plan provided by Pulumi before confirming the deployment to avoid unintended changes to your cloud resources.

After deploying, you can use the exported kubeconfig to interact with your cluster using `kubectl` or other Kubernetes management tools.