Deploy the cassandra-reaper helm chart on AWS EKS

Question

Pulumi · Accepted Answer

Deploying the Cassandra Reaper Helm Chart on AWS EKS will involve several steps. You'll need to:

1. Set up an Amazon EKS cluster, which is a managed Kubernetes service.
2. Configure `kubectl` to communicate with your EKS cluster.
3. Use a Helm chart to deploy Cassandra Reaper, which is a tool for repairing Apache Cassandra clusters.

Below is a guide on how you would write a Pulumi program in TypeScript to deploy the Cassandra Reaper on AWS EKS via Helm.

### Step-by-step Explanation and Program

#### Step 1: Create the EKS cluster

First, we create an EKS cluster. We are using the `eks.Cluster` resource from the `eks` package which is a high-level Pulumi component that neatly encapsulates the EKS cluster creation.

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

// Create an EKS cluster
const cluster = new eks.Cluster("cassandra-eks-cluster", {
    desiredCapacity: 2, // Set desired number of worker nodes
    minSize: 1,        // Set minimum number of worker nodes
    maxSize: 3,        // Set maximum number of worker nodes
    storageClasses: "gp2", // Define the storage class
    deployDashboard: false, // Optionally deploy the Kubernetes dashboard
});
```

#### Step 2: Deploy the Cassandra Reaper Helm Chart

Next, we will deploy Cassandra Reaper using the Helm chart. We utilize `kubernetes.helm.v3.Chart` which is Pulumi's way to deploy Helm charts on a Kubernetes cluster.

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

// Deploy the cassandra-reaper Helm chart
const reaperChart = new k8s.helm.v3.Chart("cassandra-reaper", {
    chart: "cassandra-reaper",
    version: "x.x.x", // Specify the version of the Helm chart
    fetchOpts: {
        repo: "http://helm.reaper.io" // The repository where Cassandra Reaper chart is hosted
    },
}, { provider: cluster.provider });
```

Here you specify the chart name ("cassandra-reaper"), the version, and provide the URL of the Helm repository that hosts the Cassandra Reaper chart.

#### Stack Exports

Lastly, output some of the information needed to access your EKS cluster and the Cassandra Reaper service.

```typescript
export const kubeconfig = cluster.kubeconfig; // Export kubeconfig to connect to the EKS cluster
```

### Complete Program

Here is the complete Pulumi program:

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

// Create an EKS cluster
const cluster = new eks.Cluster("cassandra-eks-cluster", {
    desiredCapacity: 2,
    minSize: 1,
    maxSize: 3,
    storageClasses: "gp2",
    deployDashboard: false,
});

// Deploy the cassandra-reaper Helm chart
const reaperChart = new k8s.helm.v3.Chart("cassandra-reaper", {
    chart: "cassandra-reaper",
    version: "x.x.x", // Replace with the actual chart version 
    fetchOpts: {
        repo: "http://helm.reaper.io", // Replace with the actual Helm repo URL if different
    },
}, { provider: cluster.provider });

// Stack exports
export const kubeconfig = cluster.kubeconfig;
```

This program will set up an EKS cluster and deploy Cassandra Reaper using its Helm chart. Note that you will need to replace `"x.x.x"` with the specific version of the `cassandra-reaper` Helm chart you want to install, and `"http://helm.reaper.io"` with the correct Helm repository URL, if it is hosted somewhere else.

You can investigate the [`eks.Cluster`](https://www.pulumi.com/docs/reference/pkg/eks/cluster/) and [`kubernetes.helm.v3.Chart`](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm/v3/chart/) resources on Pulumi's documentation for more information about the available options and configurations.

Please remember that deploying cloud resources will incur costs, and you should always review the resources and any associated costs that will be generated by running your Pulumi program. Additionally, ensure you have the necessary permissions to create and manage AWS EKS clusters and Helm charts.