Deploy the statefulset helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a StatefulSet Helm chart on Kubernetes using Pulumi, you'll start by setting up your Pulumi environment with the necessary Kubernetes provider. Then you'll create a Pulumi program in TypeScript that defines the deployment of the Helm chart. The chart could be from the official Helm repository or a custom one, and you might want to customize it with values specific to your deployment needs.

Here is a step-by-step guide on how you would write a Pulumi program to deploy a StatefulSet Helm chart:

1. **Setting Up Pulumi Project**: Make sure you have a Pulumi project initialized. If you haven't done this, you can create a new project with `pulumi new kubernetes-typescript`.

2. **Configuring the Kubernetes Provider**: Ensure that you have access to a Kubernetes cluster and that your `kubeconfig` file is correctly set up to point to this cluster. Pulumi uses this configuration to communicate with your Kubernetes cluster.

3. **Helm Chart Deployment**: In the Pulumi program, use the `helm.sh/v3.Chart` resource to deploy a Helm chart. You need to specify the name of the chart, the repository (if it's a custom repository), and any configuration values you need to override.

Below is a TypeScript program that deploys a StatefulSet using a Helm chart:

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

// Provide the name of your chart and the version.
const chartName = "example-statefulset";
const chartVersion = "1.2.3"; // Ensure this is the correct version you desire.

// Provide the repository URL where your Helm chart is located.
// This is usually something like "https://charts.example.com/"
const chartRepo = "https://example.com/charts";

// Configuration values to override the ones in the chart.
// This should mirror the structure of the `values.yaml` file in the Helm chart.
const chartValues = {
  // Add your own configuration values here as needed.
  replicaCount: 3,
  // You can specify further custom values schema here depending on the chart.
};

const statefulSetChart = new k8s.helm.sh.v3.Chart(chartName, {
  chart: chartName,
  version: chartVersion,
  fetchOpts: {
    repo: chartRepo,
  },
  // Assign your values to configure the chart.
  values: chartValues,
}, { provider: k8sProvider });

// Export the StatefulSet name by accessing the resource's `metadata` field.
export const statefulSetName = statefulSetChart.getResourceProperty("v1/StatefulSet", chartName, "metadata").apply(m => m.name);
```

**Explanation:**

- We import the Kubernetes package from Pulumi to interact with the Kubernetes API.

- We define the chart name, version, and repository. The repository URL is where your Helm chart is hosted.

- We then define an object `chartValues` for any configuration overrides that the Helm chart requires.

- Next, we instantiate a new `Chart` resource, specifying the chart name, version, and supply the repository URL. We also apply the custom configuration values in the instantiation.

- Lastly, we export the name of the StatefulSet for easy access. The `getResourceProperty` function is used to retrieve specific details from deployed resources.

This Pulumi program can be executed by running `pulumi up` after setting up the Pulumi project. Ensure that you have authenticated to your Kubernetes cluster (the context set in your `kubeconfig`) and that Pulumi is installed and configured on your system.