Deploy the overprovisioning helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the overprovisioning Helm chart on an OpenShift cluster using Pulumi, you will primarily need the `kubernetes` and `helm.sh` Pulumi packages. The `kubernetes` package provides resources for managing Kubernetes resources including namespaces, deployments, and services, while the `helm.sh` package offers resources for working with Helm charts in a Kubernetes cluster.

Below is a program written in TypeScript that shows how you can deploy a Helm chart named "overprovisioning" (which you should have available or know its repository) onto an OpenShift cluster using Pulumi.

This program assumes that you have already configured `kubectl` to communicate with your OpenShift cluster and that your Helm chart is accessible from your Pulumi code either through a public Helm repository or by specifying the chart's path if it's stored locally.

Here is the Pulumi TypeScript program:

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

// Create a namespace for the overprovisioning Helm chart if needed.
const ns = new k8s.core.v1.Namespace("overprovisioning-ns", {
    metadata: {
        // You can name your namespace as per your convention or requirement.
        name: "overprovisioning",
    },
});

// Deploy the overprovisioning Helm chart into the namespace.
const overprovisioningChart = new k8s.helm.v3.Chart("overprovisioning-chart", {
    // Assuming the chart is available in a repository. Replace with the correct repo and chart details.
    // If your chart is stored locally, you would use the 'path' property instead of 'repo' and 'chart'.
    chart: "overprovisioning",
    version: "1.0.0", // Specify the version of the chart you wish to deploy.
    repositoryOpts: { 
        repo: "https://charts.yourcompany.com/", // Replace with the URL of the Helm repository.
    },
    namespace: ns.metadata.name,
    // Define any custom values.yaml settings here.
    values: {
        // Example value override - please adjust according to actual chart values
        replicaCount: 2,
    },
}, { dependsOn: ns });

// Export the namespace and chart name 
export const namespaceName = ns.metadata.name;
export const chartName = overprovisioningChart.metadata.name;
```

This program does the following:
1. Creates a new namespace for your Helm chart deployment if necessary (this step is optional, and you can deploy to an existing namespace if you prefer).
2. Initializes a new instance of a Helm chart using the `k8s.helm.v3.Chart` resource from Pulumi's Kubernetes provider. We name this instance `overprovisioning-chart`.
3. Specifies the chart name and version. Make sure to replace the `repo` and `chart` properties with the correct values that point to the overprovisioning Helm chart you wish to deploy.
4. Optionally, you can override default values in the Helm chart by specifying them in the `values` section. This is similar to how you could use a custom `values.yaml` file with `helm` CLI.
5. Declares a dependency on the namespace to ensure it is created before attempting to deploy the Helm chart.
6. Exports the namespace and the chart name for easy access after the deployment. This can be useful if you need to query these values programmatically at a later stage.

Please adjust the properties of the Helm chart as necessary based on where your chart is stored and any custom configuration it requires. When you run this Pulumi program, it will deploy the specified Helm chart to your OpenShift cluster. To run the program, you need Pulumi CLI installed and configured for your Kubernetes cluster. After writing the code into a `.ts` file, you can use the following commands:

```
pulumi stack init dev  // to create a new stack
pulumi up              // to preview and deploy the changes
```

Ensure you review the plan that Pulumi prints out before you confirm the deployment. After confirming, Pulumi will perform the deployment to your OpenShift cluster.