Deploy the traefik2 helm chart on Rancher

Question

Pulumi · Accepted Answer

Deploying the Traefik v2 Helm chart on a Rancher-managed Kubernetes cluster involves several steps. You'll need to set up your Rancher Kubernetes cluster, add a Helm chart repository, and then deploy the chart.

Below is a description of the process you will go through in Pulumi, written in TypeScript. We'll make use of `rancher2` package for managing resources in Rancher, and we will assume that you have a Rancher Kubernetes cluster already running.

Here are the steps we'll cover in the program:

1. **Setup**: Import the required Pulumi and Rancher packages.
2. **Repository**: Add the Traefik Helm chart repository to Rancher.
3. **Deployment**: Deploy the Traefik v2 Helm chart.

Before you proceed with the Pulumi code, ensure that:
- You have Pulumi CLI installed.
- You are logged in to the Pulumi CLI and selected the appropriate stack.
- You have the access credentials to your Rancher server and have the necessary rights to deploy applications.
- Helm chart repository for Traefik v2 is known (For Traefik, it is usually `https://helm.traefik.io/traefik`).

Here's the Pulumi program that performs the above steps:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as rancher2 from "@pulumi/rancher2";
import * as k8s from "@pulumi/kubernetes";

// Step 1 - Ensure your cluster is configured in Rancher and you have captured its ID.
// In this example, we are using a preconfigured cluster with a known cluster ID.
// Replace 'CLUSTER_ID' with your actual Rancher Cluster ID.
const clusterId = "CLUSTER_ID";

// Step 2 - Add the Traefik v2 Helm chart repository to Rancher
const traefikRepo = new rancher2.CatalogV2("traefik-repo", {
    clusterId: clusterId,
    url: "https://helm.traefik.io/traefik", // Traefik Helm repo URL
    name: "traefik",
    gitBranch: "", // not needed for Helm repos, providing empty string
});

// Step 3 - Deploy the Traefik v2 Helm chart using the Pulumi Kubernetes provider
// Note that this assumes that you have the k8s provider configured with the
// kubeconfig of your Rancher provisioned cluster.
const traefikChart = new k8s.helm.v3.Chart("traefik", {
    chart: "traefik",
    fetchOpts: { repo: "https://helm.traefik.io/traefik" },
    version: "9.18.2", // specify the version of the chart you want to deploy
    namespace: "kube-system", // specify the namespace where you want to deploy
    // Include any custom values file or settings that you want to pass to the Helm chart
    values: {
        rbac: {
            enabled: true,
        },
        service: {
            type: "LoadBalancer",
        },
        // ... more custom values
    },
}, { dependsOn: [traefikRepo] }); // Ensure Helm repo is added before deploying the chart

// Export the resources' names
export const traefikRepoName = traefikRepo.metadata.name;
export const traefikChartName = traefikChart.metadata.name;
```

Let's breakdown what the program does:

- The `rancher2.CatalogV2` resource represents the Helm chart repository in your Rancher setup. It is initialized with the URL to the Traefik Helm repository and is associated with your specific Rancher cluster by the `clusterId`.
- The `k8s.helm.v3.Chart` resource is responsible for deploying the chart from the repository we've just added. It specifies various parameters such as chart name, repository URL, chart version, and namespace.
- The `values` object within the chart resource allows you to specify any custom values to configure Traefik according to your needs.
- Finally, the `dependsOn` option is used to ensure the Helm repository resource is created before the chart is deployed.

Make sure to replace `"CLUSTER_ID"` with your actual cluster ID from Rancher and to verify Helm chart details, such as version and available configuration options.

After you've set up this program, you can deploy it using the Pulumi CLI with `pulumi up`. Pulumi will communicate with your Rancher setup and Kubernetes cluster to deploy Traefik as per the configuration specified.