Deploy the typo3scan helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `typo3scan` Helm chart on Linode Kubernetes Engine (LKE) using Pulumi, we will first need to ensure we have a Kubernetes cluster running on Linode. The following steps and the included Pulumi program illustrate the necessary resources and steps to achieve this:

1. **Install the Pulumi CLI**: Make sure you have the Pulumi CLI installed on your local system.
2. **Set up Linode credentials**: Ensure that you have configured your Linode credentials either as environment variables or via the Linode CLI.
3. **Create a new Pulumi project**: This is your infrastructure application where you'll write the deployment code.
4. **Define the Kubernetes Cluster**: We'll define a cluster on Linode using the Pulumi Linode provider.
5. **Install the Helm Chart**: After the cluster is up and running, we'll use the Pulumi Kubernetes provider to install the `typo3scan` Helm chart to the Linode Kubernetes cluster.

Below is a Pulumi program written in TypeScript that defines these steps:

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

// Step 1: Create a new Linode Kubernetes Cluster
// Here, we create a Kubernetes cluster in Linode with the required parameters.
// Adjust the parameters as necessary to fit your needs (e.g., region, node count).

const cluster = new linode.LkeCluster("my-cluster", {
    k8sVersion: "1.18", // Specify the version of Kubernetes
    region: "us-central", // Specify the region where the cluster will be created
    tags: ["pulumi-lke-cluster"],
    pool: [{
        count: 2, // Number of nodes in the node pool
        type: "g6-standard-2", // Type of nodes to deploy
    }],
});

// Step 2: Export the kubeconfig
// We export the kubeconfig of the cluster so that we can access it using kubectl or other Kubernetes management tools.

export const kubeconfig = cluster.kubeconfig;

// Once the cluster is provisioned, use the output kubeconfig to set up the K8s provider.

const k8sProvider = new k8s.Provider("k8s", {
    kubeconfig: cluster.kubeconfig.apply(JSON.stringify), // Convert the kubeconfig output to a string
});

// Step 3: Deploy typo3scan Helm chart
// after the cluster is available, which installs the `typo3scan` application to the cluster.
// You will need to specify the repo or have it pre-configured in your Helm settings.
// Below is an example of deploying a hypothetical Helm chart for typo3scan. Ensure that
// you're using the correct chart name and optionally the values you want to override in `values`.

const typo3scanChart = new k8s.helm.v3.Chart("typo3scan-chart", {
    chart: "typo3scan", // Replace with the correct chart name
    version: "1.0.0", // Specify chart version
    // Uncomment and set to the appropriate repository if the chart is not in the default Helm repo
    // repo: "https://myhelmrepo.com/charts",
    values: {
        // Specify any values you want to override, for example:
        // service: {
        //     type: "LoadBalancer",
        // },
    },
}, { provider: k8sProvider });

// Step 4: Export the Helm chart deployment details
// We can export details such as the service URL if `typo3scan` exposes any endpoints.

export const typo3scanServiceUrl = typo3scanChart.getResourceProperty("v1/Service", "typo3scan-service", "status").apply(status => status.loadBalancer.ingress[0].hostname);
```

Let me break down the process for you:

1. **Cluster Creation**: We create an LKE cluster with `linode.LkeCluster`, specifying the Kubernetes version, region, and node pool configuration. Make sure to choose a region where LKE is available and a node type that suits your workload requirements.

2. **Kubeconfig Export**: We export the generated kubeconfig which allows us to interact with our Kubernetes cluster using tools like `kubectl`.

3. **Kubernetes Provider Setup**: The `kubeconfig` output is used to configure our Kubernetes provider within Pulumi.

4. **Helm Chart Deployment**: Pulumi's Kubernetes provider has a Helm Chart resource that lets us deploy charts easily. Here we deploy the `typo3scan` chart on our Kubernetes cluster. You'll need to make sure you're using the correct Helm chart name and repository (the `repo` attribute). I've used a placeholder version, but you should replace it with the specific chart version you're looking to deploy.

5. **Service URL Export**: Finally, we export the LoadBalancer URL assuming that the `typo3scan` service is of the type LoadBalancer. If not, this will need to be adjusted based on the specifics of the Helm chart.

To run this Pulumi program, save it to an `index.ts` TypeScript file in your Pulumi project directory, and then run `pulumi up`. This will provision the resources on Linode and deploy the typo3scan Helm chart. Ensure you've got the Pulumi Linode and Kubernetes providers set up before running the command.