Deploy the fluentd-kubernetes helm chart on Rancher

Question

Pulumi · Accepted Answer

To deploy the `fluentd-kubernetes` Helm chart on a Rancher-managed Kubernetes cluster, you'll need to first ensure you have a Rancher Kubernetes cluster created and managed by Rancher. To accomplish this with Pulumi, you'll use the `rancher2` provider, which helps manage resources in a Rancher v2.x environment.

Before starting, it's important to have the `rancher2` provider installed and configured for Pulumi. You'll also ensure that you have access to a Helm chart repository that includes the `fluentd-kubernetes` chart.

To demonstrate how to deploy the `fluentd-kubernetes` Helm chart, we'll go through the following steps in the Pulumi program:

1. Set up a Rancher Kubernetes cluster (if you don't have an existing one).
2. Install the Helm chart on the cluster.

Here's a Pulumi program that performs these steps using TypeScript. Ensure you have the required credentials for Rancher and the Kubernetes cluster configured.

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

// Create a Rancher Kubernetes Cluster - This is only necessary if you do not already have a Rancher-managed cluster.
// Replace the '<YOUR_VALUES>' placeholders with actual values for your Rancher setup.
const cluster = new rancher2.Cluster("my-cluster", {
    // Insert your specific cluster configuration parameters here
    // rkeConfig, name, etc.
    // For example:
    name: "my-fluentd-cluster",
    rkeConfig: {
        // specific rkeConfig parameters
    },
    // other necessary parameters
});

// Once the cluster is ready, you can get the 'kubeconfig' for that cluster
// which is necessary to create the Kubernetes provider instance.

// Expose the kubeconfig as an output from the cluster
const kubeconfig = cluster.kubeConfig.rawConfig;

// Use the kubeconfig to create a provider instance for Kubernetes.
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Install the fluentd-kubernetes Helm chart on the Rancher-managed cluster
const fluentdHelmRelease = new k8s.helm.v3.Release("fluentd-release", {
    chart: "fluentd-kubernetes",
    version: "x.x.x", // Replace with the chart version you want to install
    repositoryOpts: {
        repo: "https://charts.fluentd.io", // Replace with the actual repository if different
    },
}, { provider: k8sProvider });

// Export the Fluentd Helm Release status
export const fluentdStatus = fluentdHelmRelease.status;
```

### Explanation:

- We import the `rancher2` and `kubernetes` modules from Pulumi's package collection to manage Rancher resources and interact with Kubernetes.
  
- We instantiate a new Rancher v2.x cluster with the `rancher2.Cluster` class. This class takes a range of parameters to describe the desired state of the cluster. For simplicity, the example code includes placeholders where actual values must be inserted according to your Rancher environment and cluster specifications.

- Once the cluster is created, we retrieve its kubeconfig. This step is represented by the `kubeconfig` constant that simply references the `kubeConfig.rawConfig` attribute of the created cluster. This kubeconfig is critical for Pulumi to interact with the Kubernetes API server of the cluster.

- With kubeconfig at hand, we set up a Pulumi Kubernetes provider. This provider will be used to communicate with the Kubernetes API of the Rancher-managed cluster.

- The `fluentd-kubernetes` Helm chart is deployed using Pulumi's `k8s.helm.v3.Release` class. You must replace `'x.x.x'` with the actual chart version and provide the repository URL where the chart is hosted.

- Finally, we export the status of the Helm release to verify that the deployment is successful and to retrieve any details about the deployment.

Remember to replace placeholders with the actual values relevant to your setup and ensure that the Helm repository URL and chart name are correct. The program assumes you have all necessary access rights to manage the cluster on Rancher and deploy Helm charts to it.