Deploy the cassandra-reaper helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Cassandra Reaper Helm chart on Digital Ocean Kubernetes Service using Pulumi, you'll need to follow these steps:

1. Set up a DigitalOcean Kubernetes Cluster.
2. Install and configure Helm and Tiller on the cluster.
3. Use Helm to deploy the Cassandra Reaper chart.

I'm providing you with a Pulumi TypeScript program that carries out these tasks.

First, ensure you have Pulumi CLI installed and you're logged in to your DigitalOcean account with the necessary credentials configured.

Next, the provided code snippet will:

- Create a new Kubernetes cluster on DigitalOcean.
- Use a Helm Chart to deploy Cassandra Reaper on the cluster.

Here is the detailed TypeScript program to achieve this:

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

// Step 1: Create a DigitalOcean Kubernetes Cluster
// Replace `<your-cluster-name>` with the name you would like for your Kubernetes cluster.
// For other configuration options, visit https://www.pulumi.com/registry/packages/digitalocean/api-docs/kubernetescluster/
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1",
    version: "latest",
    nodePool: {
        name: "worker-pool",
        size: "s-1vcpu-2gb", // You can choose the size according to your requirements
        nodeCount: 2,
    },
});

// Step 2: Set up a Kubernetes Provider pointing to the DigitalOcean cluster created above
// This uses the cluster's kubeconfig to create a Kubernetes provider instance
const k8sProvider = new kubernetes.Provider("do-k8s", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Deploy Cassandra Reaper using the Helm Chart
// For more information on the Helm Chart resource, visit https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm/v3/chart/
const reaperChart = new kubernetes.helm.v3.Chart("cassandra-reaper", {
    chart: "cassandra-reaper",
    // You will have to ensure this repo has been added to your helm configuration or add it as a repository option.
    fetchOpts: { 
        repo: "https://helm.k8ssandra.io/",
    },
    namespace: "default", // Change the namespace if needed
    // Specify any custom values required for the Cassandra Reaper chart.
    values: {
        persistence: {
            storageClass: "do-block-storage", // Ensure you have a storage class relevant to DigitalOcean
            size: "5Gi",
        },
    },
}, { provider: k8sProvider });

// Step 4: Export the kubeconfig and the Helm release status
export const kubeConfig = cluster.kubeConfigs[0].rawConfig;
export const reaperStatus = reaperChart.status;
```

This program performs the following actions:

1. It creates a DigitalOcean Kubernetes cluster with a specified name, region, version, and nodes configuration.
2. It sets up a Kubernetes provider which interacts with the created cluster.
3. It deploys the Cassandra Reaper helm chart using the `kubernetes.helm.v3.Chart` resource.
4. It exports the raw kubeconfig of the cluster and the status of the Helm release for Cassandra Reaper.

Save this code into a file with a `.ts` extension, for example, `deploy-reaper.ts`. You can then use the Pulumi CLI to create a new stack and preview the deployment:

```shell
pulumi stack init dev
pulumi up
```

The `pulumi up` command will show you a preview of the resources Pulumi will deploy. If everything looks good, confirm the deployment, and Pulumi will proceed to set up the cluster and deploy Cassandra Reaper to it. After the deployment, you will get outputs to access your Kubernetes cluster and the status of the Helm release.