Deploy the horovod helm chart on Kubernetes

Question

Pulumi · Accepted Answer

Deploying a Helm chart on Kubernetes with Pulumi involves using the `helm.sh/v3.Chart` resource from the Kubernetes provider. This allows you to manage Helm charts in a declarative way using Pulumi's infrastructure-as-code approach.

Here's how you would deploy the Horovod Helm chart on a Kubernetes cluster using Pulumi and TypeScript:

1. **Setup Your Pulumi Project**: Ensure that you have Pulumi installed and set up. You should also have access to a Kubernetes cluster and have your `kubeconfig` file configured to communicate with the cluster.

2. **Create a New TypeScript Project**: Use the `pulumi new typescript` command to create a new Pulumi TypeScript project.

3. **Define the Deployment of the Helm Chart**: Within the Pulumi program, you'll instantiate a `helm.sh/v3.Chart` resource to deploy the Horovod chart.

4. **Deploy your Stack**: After defining the deployment, use `pulumi up` to execute the deployment to your cluster.

Here is a program that deploys the Horovod Helm chart on Kubernetes:

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

// This is the name of the Helm chart we want to deploy
const chartName = "horovod";

// The version of the Helm chart to deploy. Replace with the version you want.
const chartVersion = "x.y.z";

// The Kubernetes namespace to deploy into. If not specified, Pulumi will deploy to the 'default' namespace.
const namespace = "your-namespace";

const horovodChart = new k8s.helm.v3.Chart(chartName, {
  chart: chartName,
  version: chartVersion,
  namespace: namespace,
  // If your Helm chart or cluster requires additional configuration,
  // you can include it in `values`.
  values: {
    // ... specify custom values for your chart here ...
  },
});

// Export the name of the namespace Horovod was deployed into
export const horovodNamespace = namespace;
```

In the above program:
- We import the Pulumi Kubernetes SDK.
- We specify the Helm chart name -- `horovod`. You'll need to replace `x.y.z` with the version number of the Horovod Helm chart that you want to deploy.
- We define the Kubernetes namespace where we will deploy the Helm chart. If you do not have a specific namespace, you can deploy to the default namespace or create one.
- We create a new `Chart` resource. This resource represents a Helm chart deployment in your Kubernetes cluster. The configuration includes the namespace, the name, and version of the chart, and any custom `values` that your Helm chart requires. You may need to define these additional configuration options according to the specific needs of the Horovod Helm chart.
- Lastly, we export the namespace name for reference. This can be helpful if you're managing multiple stacks or want to reference this namespace in separate Pulumi programs.

Remember to replace placeholders like `x.y.z` and `your-namespace` with actual values before running the program.

To deploy this program:

1. Navigate to your Pulumi project directory in the terminal.
2. Run `npm install @pulumi/kubernetes` to install the necessary Pulumi Kubernetes package.
3. Save your Pulumi program in a file (for example `index.ts`).
4. Run `pulumi up` to preview and deploy the changes to your Kubernetes cluster. Follow the prompts from the CLI to confirm and perform the deployment.

After the deployment is successful, the Horovod Helm chart will be running in the specified namespace on your Kubernetes cluster.