Using kubernetes kubernetes-client.io with pulsar.streamnative.io

Question

Pulumi · Accepted Answer

To create a Kubernetes cluster and deploy Apache Pulsar with Pulumi, you would typically use Pulumi's Kubernetes API to define the necessary resources.

In this explanation, we'll be setting up the following:

1. A Kubernetes cluster: This will be the environment where Apache Pulsar will be deployed. For simplicity, we'll assume you have a cluster up and running which can be any cloud Kubernetes service (like AKS, EKS, GKE) or a local one like minikube.
   
2. Apache Pulsar: This is a distributed publishing and subscribing messaging platform. We'll deploy Pulsar into our Kubernetes cluster.

For the Kubernetes client, we'll assume you want to use a Pulsar client to interact with your Pulsar cluster deployed inside Kubernetes. The Pulsar client will not be directly deployed with Pulumi but instead used externally to communicate with Pulsar.

Here's a Pulumi TypeScript program that deploys Apache Pulsar onto a Kubernetes cluster:

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

// Use an existing Kubernetes cluster context (e.g., previously created using a cloud provider or running locally)
const clusterProvider = new k8s.Provider("k8s-provider", {
  // If you have a specific kubeconfig file you want to use, you can pass it here
  // otherwise it will use the default config from your local environment.
  // kubeconfig: "~/.kube/config",
});

// Pulsar can be deployed using the Helm Chart, you need to add Helm chart repository
const pulsarChart = new k8s.helm.v3.Chart("pulsar", {
  chart: "apache-pulsar",
  // You can specify the Helm chart version you want to use
  version: "2.6.1",
  fetchOpts:{
    repo: "https://pulsar.apache.org/charts",
  },
}, { provider: clusterProvider });

// Export the Kubernetes Config so that clients (e.g., Pulsar clients) can connect to the Kubernetes cluster
export const kubeConfig = clusterProvider.kubeconfig;
```

This program assumes that you have a Kubernetes cluster already running and correctly configured in your environment, either via a cloud provider or locally through minikube or Docker Desktop.

In this program:

- The `@pulumi/kubernetes` package is used to interact with Kubernetes.
- We create a Kubernetes provider that Pulumi uses to know how to communicate with your Kubernetes clusters, like setting the kubeconfig file.
- We deploy Apache Pulsar using its Helm chart. Pulumi's Helm support lets you deploy existing Helm charts without having to manually convert them into Pulumi code.
- The Pulsar Helm chart is hosted at `https://pulsar.apache.org/charts`, and we use version `2.6.1` in this example. Make sure to check for the latest and most stable version for your use case.
- Lastly, we export the kubeconfig, which you can use to configure your Kubernetes client.

Please note that the actual details of your Apache Pulsar configuration will depend on your specific requirements, such as custom Pulsar configurations, persistence, and the amount of resources allocated to Pulsar components. You'll need to customize the `values` parameter in the `Chart` resource above to tweak Pulsar's setup.

This program does not install the Pulsar client; it focuses on deploying Pulsar to Kubernetes. Once Pulsar is running in Kubernetes, you would use the Pulsar client outside of this Pulumi program to interact with the Pulsar cluster, typically from an application that you are developing. You can find client libraries for Apache Pulsar for various programming languages that you can integrate into your application [here](https://pulsar.apache.org/docs/en/client-libraries/).

To run this Pulumi program, you will first need to install Pulumi and set up the Pulumi CLI with your desired cloud provider. Then you can place the above code in a file named `index.ts` in a new Pulumi project directory, run `npm install` to retrieve the necessary packages, and execute `pulumi up` to deploy your changes.

Keep in mind that managing cloud resources with Pulumi could incur costs, depending on the resources created and your cloud provider's pricing model. Always review the cost implications of the resources being created by your Pulumi programs.