Deploy the rtorrent helm chart on Google Kubernetes Engine (GKE)

Question

Pulumi · Accepted Answer

To deploy the `rtorrent` Helm chart on Google Kubernetes Engine (GKE), you will need to complete several steps:

1. Provision a GKE cluster.
2. Install and configure Helm in your local environment or wherever you run Pulumi.
3. Use Pulumi's Helm support to deploy the `rtorrent` chart to your GKE cluster.

Below you'll find a Pulumi program written in TypeScript that demonstrates how to accomplish these steps. This program uses Pulumi’s `@pulumi/gcp` package for creating the GKE cluster and Pulumi's `@pulumi/kubernetes` package to deploy the Helm chart.

First, let's install the necessary Pulumi packages by running:

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

Once the packages are installed, you can create a new TypeScript Pulumi program.

Make sure you have configured your Pulumi with GCP credentials, and your default project and zone settings are as desired.

Here's the detailed Pulumi program:

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

// Create a GKE cluster
const cluster = new gcp.container.Cluster("rtorrent-cluster", {
    initialNodeCount: 2,
    minMasterVersion: "latest",
    nodeConfig: {
        machineType: "n1-standard-1", // Or any other desired machine type
        oauthScopes: [
            "https://www.googleapis.com/auth/compute",
            "https://www.googleapis.com/auth/devstorage.read_only",
            "https://www.googleapis.com/auth/logging.write",
            "https://www.googleapis.com/auth/monitoring"
        ],
    },
});

// Export the Cluster name and Kubeconfig
export const clusterName = cluster.name;
export const kubeconfig = cluster.endpoint.apply(endpoint => {
    return `apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${cluster.masterAuth.clusterCaCertificate}
    server: https://${endpoint}
  name: ${cluster.name}
contexts:
- context:
    cluster: ${cluster.name}
    user: ${cluster.name}
  name: ${cluster.name}
current-context: ${cluster.name}
kind: Config
users:
- name: ${cluster.name}
  user:
    auth-provider:
      config:
        cmd-args: config config-helper --format=json
        cmd-path: gcloud
        expiry-key: '{.credential.token_expiry}'
        token-key: '{.credential.access_token}'
      name: gcp
`;
});

// Create a provider for the created cluster
const clusterProvider = new k8s.Provider("gke-k8s", {
    kubeconfig: kubeconfig,
});

// Deploy rtorrent Helm chart on GKE cluster
const rtorrentChart = new k8s.helm.v3.Chart("rtorrent", {
    chart: "rtorrent",
    version: "1.0.0", // Replace with the actual chart version
    fetchOpts: {
        repo: "http://your-helm-chart-repository/", // Replace with the actual Helm chart repository URL
    },
}, { provider: clusterProvider });

// Export the Helm chart status and ready message
export const rtorrentStatus = rtorrentChart.status;
export const rtorrentReadyMessage = rtorrentChart.status.apply(status => 
    status === 'deployed' ? 'rtorrent Helm chart is deployed!' : 'rtorrent Helm chart deployment is pending...');
```

In this program, we first create a GKE cluster with a basic configuration, specifying the number of nodes and the machine type. We then export the cluster name and a generated `kubeconfig`. This `kubeconfig` is required to interact with the cluster using the Kubernetes API, which Pulumi does behind the scenes.

Next, we create a Kubernetes provider that uses the `kubeconfig` of the newly created GKE cluster. This provider will be used by Pulumi to deploy resources to the correct cluster.

Lastly, we define a Helm chart resource using the `k8s.helm.v3.Chart` class from the `@pulumi/kubernetes` package. We specify the name of the chart (`rtorrent`), the chart version, and the repository where the Helm chart is located. The `provider` we pass to the chart ensures it gets deployed to our GKE cluster.

The `rtorrentStatus` and `rtorrentReadyMessage` are exports that help us understand the status of our Helm chart deployment.

Make sure to replace the placeholders such as `"http://your-helm-chart-repository/"` with actual URLs and versions corresponding to the `rtorrent` Helm chart. As of my last knowledge, there may not be an officially-published Helm chart for rTorrent, so you might need to create one or use a community-maintained chart.

Run this program with Pulumi to provision the resources on Google Cloud. After the program completes execution, the `rtorrent` Helm chart should be deployed to your GKE cluster.