Deploy the kafdrop helm chart on Rancher

Question

Pulumi · Accepted Answer

Deploying a Helm chart on a Kubernetes cluster managed by Rancher involves several steps, including setting up the Rancher provider, establishing a connection to the Kubernetes cluster, and then deploying the Helm chart through a Helm Release.

In this Pulumi program, we will be using the following resources:

1. `rancher2.Cluster`: To select the target Kubernetes cluster managed by Rancher.
2. `rancher2.CatalogV2`: To add a Helm chart repository if it's not available in Rancher's default catalog.
3. `helm.v3.Chart`: To deploy the Kafdrop Helm chart to the chosen Kubernetes cluster.

Please ensure that you've already set up your Pulumi environment and authenticated with the Rancher API.

Below is the TypeScript program that demonstrates how to accomplish this:

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

// Note: Please ensure you configure Pulumi with your Rancher Project ID
// and other details ahead of time,
// for instance, through Pulumi configuration or environment variables.

// Rancher setup goes here, which includes setting up the rancher2 provider.
// This will require you to have access to a Rancher environment and the
// corresponding credentials (Rancher API URL, Access Key, Secret Key).
// These details should ideally be set as Pulumi configuration secrets.

// Establish a reference to your Rancher-managed Kubernetes cluster.
// Replace `clusterId` with the actual identifier for your cluster.
const cluster = new rancher2.Cluster("my-cluster", {clusterId: "REPLACE_WITH_CLUSTER_ID"});

// Add a catalog containing the Kafdrop chart if not already in Rancher default catalog.
// Provide the URL for the Helm chart repository that hosts the Kafdrop chart.
const catalog = new rancher2.CatalogV2("kafdrop-catalog", {
    url: "REPLACE_WITH_HELM_REPO_URL",
    clusterId: "REPLACE_WITH_CLUSTER_ID",
});

// Reference to the Kubernetes provider linked to the Rancher cluster.
// This is derived from the output of the Rancher2 cluster configuration.
// Assuming that the kubeconfig file is configured automatically or has been fetched
// and available to Pulumi in a secure manner.
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfig,
});

// Deploy Kafdrop Helm chart on the selected Kubernetes cluster.
const kafdropChart = new k8s.helm.v3.Chart("kafdrop", {
    chart: "kafdrop",
    version: "REPLACE_WITH_CHART_VERSION", // Specify chart version you want to deploy
    fetchOpts:{
        repo: "REPLACE_WITH_HELM_REPO_URL", // Specify Helm repository URL
    },
    // Specify namespace if necessary, and include any required values.
    // These should match with what the Kafdrop Helm chart expects.
    values: {
        // Chart values go here
    },
}, { provider: k8sProvider });

// Export the generated services URLs so that you can access Kafdrop
export const kafdropUrl = kafdropChart.getResourceProperty("v1/Service", "kafdrop", "status")
    .apply(status => status.loadBalancer.ingress[0].ip || status.loadBalancer.ingress[0].hostname);
```

Replace placeholder text such as `REPLACE_WITH_CLUSTER_ID`, `REPLACE_WITH_HELM_REPO_URL`, and `REPLACE_WITH_CHART_VERSION` with actual values relevant to your deployment. The `kafdrop` Helm chart should have its own set of configuration values (like image, replica count, etc.), which need to be provided in the `values` block when deploying the chart.

Please note that the `kubeconfig` argument given to the `k8s.Provider` is critical - it allows Pulumi to communicate with the right Kubernetes cluster. This configuration typically comes from your Rancher2 `Cluster` object, but it needs to be securely handled if it's retrieved independently.

Finally, we export the service URL for Kafdrop, which can typically be used to access the deployed application. This assumes that the Kafdrop Helm chart exposes a service of type LoadBalancer. You'll need to verify this based on the specifics of the Helm chart you're using. If your service type is different, you may need to adjust how you export the URL.

After writing this program, you can deploy it using Pulumi CLI commands such as `pulumi up`, which will provision the resources as defined in the program. Make sure you review the plan carefully and confirm the changes before proceeding with the deployment.