Deploy the overprovisioning helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy an overprovisioning Helm chart on a Kubernetes cluster using Pulumi, we'll perform the following steps:

1. Define a Helm chart resource using Pulumi's Kubernetes provider.
2. Specify the necessary parameters such as `chart`, `version`, and `values` if needed, to configure the overprovisioning behavior.
3. Deploy the Helm chart to an existing Kubernetes cluster.

The `kubernetes.helm.v3.Chart` resource from Pulumi's Kubernetes provider will be used in this case. This resource allows you to deploy Helm charts into a Kubernetes cluster. The Helm chart's name ("overprovisioning" in this scenario) and version need to be specified; you may also need to provide specific values to customize the installation.

Below is a TypeScript program that deploys an overprovisioning Helm chart to a Kubernetes cluster using Pulumi:

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

// Create a Helm Chart resource for the overprovisioning chart.
// You must have the Helm chart available in a repository or have the package locally.
const overprovisioningChart = new k8s.helm.v3.Chart("overprovisioning", {
    // Replace `CHART_VERSION` with the version of the chart you wish to deploy.
    // Replace `REPO_URL` with the URL of the Helm repository that contains the overprovisioning chart.
    chart: "overprovisioning",
    version: "CHART_VERSION",
    fetchOpts: {
        repo: "REPO_URL",
    },
    // Uncomment the following if you need to provide custom values to the overprovisioning chart.
    // values: {
    //     key1: "value1",
    //     key2: "value2",
    //     // Add other values as needed.
    // },
});

// Export the name of the chart.
// This output can be viewed after deployment and can be useful for further commands 
// such as checking the status of the Helm release.
export const chartName = overprovisioningChart.metadata.name;
```

Explanation of the program:

- We're importing Pulumi's Kubernetes SDK into our program which allows us to interact with Kubernetes resources.
- We're defining a `Chart` resource with the following parameters:
  - `chart`: a string that specifies the name of the Helm chart you want to deploy.
  - `version`: a string specifying the exact chart version to deploy.
  - `fetchOpts`: an object that includes at least the `repo` property pointing to the URL of the Helm repository containing our desired chart.
- Optionally, we can supply a `values` object which contains the configuration for our Helm chart. This replaces the need for a `values.yaml` file and allows you to pass in the necessary configuration directly in your Pulumi program.
- We're exporting the chart name, which can be useful after the deployment to perform further actions like upgrades or rollbacks with the Helm CLI or Pulumi.

Before you run the Pulumi program, you should have access to a Kubernetes cluster and your kubeconfig file should be correctly set up to point to this cluster. Additionally, you need to have Pulumi installed, your Pulumi project created, and the Kubernetes stack selected or initiated.

To apply the above program, run the following Pulumi command:

```sh
pulumi up
```

After reviewing the proposed changes shown by Pulumi, confirm the deployment by selecting `yes`. This will start the deployment process of the overprovisioning Helm chart into your Kubernetes cluster. The output will show you the progress and result of the deployment. If successful, the chart name will be displayed as part of the stack outputs.