Using kubernetes karpenter.k8s.aws with infinispan.org

Question

Pulumi · Accepted Answer

To use Karpenter on AWS with an Infinispan cluster, you would typically follow these steps:

1. **Create an AWS EKS Cluster**: First, you need to have an EKS cluster running on AWS. Karpenter requires an EKS cluster because it is a Kubernetes autoscaling solution specifically designed for AWS.

2. **Install Karpenter on EKS**: Once your EKS cluster is up and running, you can install Karpenter into it. Karpenter works with the Kubernetes scheduler to automatically adjust the capacity of your EKS cluster based on the workload.

3. **Deploy Infinispan**: Infinispan is a distributed caching and data grid platform. You can deploy it on your Kubernetes cluster as a set of pods which will then be managed by Karpenter in terms of scaling.

Here is an example Pulumi program written in TypeScript that demonstrates how you could create an EKS cluster, install Karpenter into it, and then deploy an Infinispan cluster. Note that the actual installation of Karpenter and Infinispan would typically be done using their respective Helm charts or manifest files, which are not directly represented in this Pulumi program.

First, you'll need to install the necessary Pulumi packages:
```shell
npm install @pulumi/eks
npm install @pulumi/aws
```

Here's the TypeScript Pulumi program:

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

// Creating an EKS Cluster
const cluster = new eks.Cluster("my-cluster", {
    instanceType: "t3.medium",
    desiredCapacity: 2,
    minSize: 1,
    maxSize: 4,
    storageClasses: "gp2",
    deployDashboard: false,
});

// Installing Karpenter on the cluster would be done using Helm or kubectl apply.
// This step is not directly completeable with Pulumi API but you should manage it
// as an external Kubernetes resource or Helm Chart.

// Deploying Infinispan on the cluster would be similar to Karpenter, where you would use
// a Helm chart or kubectl apply to deploy the necessary resources onto your Kubernetes cluster.

// Exporting the kubeconfig so that we can access our cluster
export const kubeconfig = cluster.kubeconfig;
```

This program sets up an EKS cluster and prepares it for installations of Karpenter and Infinispan. After running this code with Pulumi, you'd get a kubeconfig file as an output, which you could use to interact with your cluster through kubectl or other Kubernetes tools.

Let's break down the code:
- We import the necessary Pulumi libraries for AWS and EKS (`@pulumi/aws` and `@pulumi/eks` respectively).
- Using `eks.Cluster`, we create a new EKS cluster with a defined instance type, and minimum/maximum capacity to allow for autoscaling.
- The `deployDashboard` option is set to false because we do not necessarily need the Kubernetes dashboard for our purpose.
- The `kubeconfig` output allows you to interact with your cluster once it is created.

After this, to get Karpenter running on your cluster, you would typically:

1. Use `kubectl` to apply Karpenter manifests to your EKS cluster, including configuring IAM roles and identity provider configurations for Karpenter service accounts.
   
2. To deploy an Infinispan cluster on Kubernetes, you would use the Infinispan operator which you can install via `kubectl` or a Helm chart. This operator then manages the lifecycle of your Infinispan clusters.

Please note that the actual installation steps for Karpenter and Infinispan involve applying YAML definitions or Helm charts to your cluster.

You should consult the official Karpenter documentation ([AWS Karpenter](https://karpenter.sh/docs/getting-started/)) for the precise steps on how to install Karpenter in your EKS cluster. Similarly, refer to the Infinispan operator documentation ([Infinispan Operator](https://infinispan.org/docs/infinispan-operator/main/operator.html)) to understand how to deploy and manage Infinispan in a Kubernetes environment.