Using kubernetes addons.cluster.x-k8s.io with fluentbit.fluent.io

Question

Pulumi · Accepted Answer

To use Kubernetes add-ons with `addons.cluster.x-k8s.io` along with `fluentbit.fluent.io`, you would typically need to deploy the Fluent Bit add-on to an existing Kubernetes cluster. Fluent Bit is used for logging and is part of the Fluentd ecosystem, often chosen for its lightweight nature and ease of integration into Kubernetes environments.

Here’s a high-level breakdown of steps you’ll take for integrating Fluent Bit into a Kubernetes cluster using Pulumi in TypeScript:

1. **Define the Kubernetes Cluster**: You'll create a Kubernetes cluster where you'll deploy Fluent Bit. The cluster can be provisioned using Pulumi's `@pulumi/eks` or native cloud provider packages like `@pulumi/aws` or `@pulumi/awsx`.
   
2. **Install Fluent Bit**: You will then define a Kubernetes add-on that uses the Fluent Bit configuration. This will involve creating Kubernetes resources such as namespaces, service accounts, configmaps, daemonsets, or others as needed for Fluent Bit to run properly.

Let's walk through a Pulumi TypeScript program that demonstrates how to perform these steps. Before you start writing this code, be sure you've set up Pulumi and have access to a Kubernetes cluster or the necessary cloud provider credentials to create one.

First, import the necessary Pulumi and Kubernetes libraries:

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

If you don't already have a Kubernetes cluster, you can create one using Pulumi. Here's an example of creating an Amazon EKS cluster using Pulumi's `@pulumi/eks` package:

```typescript
import * as eks from "@pulumi/eks";

// Create an EKS cluster.
const cluster = new eks.Cluster("my-cluster", {
    // Specify the desired settings for the EKS cluster.
    // For AWS, you do not necessarily need to specify the version as it defaults to latest.
    // However, it is a good practice to pin it for consistent behavior.
    version: "1.21",
    // ...
});

// Export the cluster's kubeconfig.
export const kubeconfig = cluster.kubeconfig;
```

Refer to the [Pulumi EKS documentation](https://www.pulumi.com/registry/packages/eks/) for a full list of configuration options when creating an EKS cluster.

Next, you will create the Fluent Bit deployment within your Kubernetes cluster:

```typescript
// Import the Kubernetes provider and Fluent Bit's Helm Chart.
import * as helm from "@pulumi/kubernetes/helm";

// Get a reference to the K8s provider instance associated with the cluster from the previous step.
const provider = new k8s.Provider("provider", { kubeconfig: cluster.kubeconfig });

// Deploy Fluent Bit using its Helm chart.
const fluentBit = new helm.v3.Chart("fluent-bit", {
    chart: "fluent-bit",
    version: "0.16.1", // Use a specific version of the Fluent Bit Helm chart.
    fetchOpts: { repo: "https://fluent.github.io/helm-charts" },
}, { provider });

// Export the name of the Fluent Bit Helm release.
export const fluentBitReleaseName = fluentBit.releaseName;
```

In the above code:
- `helm.v3.Chart` is used to deploy the Fluent Bit Helm chart. You specify the chart name, version, and repository from where it should fetch the chart.
- You also pass the Kubernetes provider, which is configured to manage resources in the cluster created with Pulumi.

The example assumes that you want to install Fluent Bit using its Helm chart. If you were to configure Fluent Bit more granularly without using Helm, you'd need to create each resource (ConfigMap, DaemonSet, etc.) using corresponding Kubernetes resource classes from the `@pulumi/kubernetes` package.

Remember to replace the placeholder code such as `version`, `chart`, and other configuration parameters with the actual values you intend to use, and add any additional configuration you might need.

This is a basic example meant to get you started. Your actual implementation might differ based on your specific requirements, Kubernetes environment, and Fluent Bit configuration. Pulumi’s flexibility allows you to tailor your infrastructure code to your exact needs.

After writing this Pulumi code, you would run it using the Pulumi CLI commands `pulumi up` to deploy the changes. Ensure you review the detailed update plan output by Pulumi before confirming the deployment so that you can verify that it will create the desired resources.