Deploy the external-scaler-azure-cosmos-db helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `external-scaler-azure-cosmos-db` Helm chart on OpenShift using Pulumi, you will be using the `kubernetes.helm.sh/v3.Chart` resource from Pulumi's Kubernetes provider. This resource allows you to deploy Helm charts to a Kubernetes cluster, which in this case will be an OpenShift cluster. OpenShift is a Kubernetes distribution from Red Hat, so you will essentially be interacting with a Kubernetes API.

Below you'll find a Pulumi TypeScript program that performs the deployment. The program assumes:

- You have an existing OpenShift cluster and you've configured `kubectl` to interact with it.
- Your Pulumi installation is set up to use the Kubernetes provider.
- You know the Helm chart repository URL where the `external-scaler-azure-cosmos-db` chart is located or assume it's publicly available in a well-known repository.

Here's a step-by-step explanation of what the Pulumi program does:

1. **Import necessary modules**: We import the required Pulumi and Kubernetes modules that include the classes and functions needed to interact with Kubernetes resources.

2. **Create a new Helm Chart resource**: We instantiate a `Chart` resource, which represents the Helm chart we wish to deploy. We specify parameters such as the chart name, version, and any custom values that the chart requires.

3. **Configure the Helm Chart resource**: If the chart requires specific configuration values, such as connection strings or resource limits, these are supplied within the `values` parameter.

4. **Deploy to the OpenShift cluster**: Pulumi will communicate with the OpenShift cluster as configured by the user's local `kubeconfig` file. It will apply the Helm chart to the cluster in the specified namespace.

Now, here's the Pulumi TypeScript program:

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

// Define the name and version of the Helm chart you want to deploy
const chartName = "external-scaler-azure-cosmos-db";
const chartVersion = "1.0.0"; // Replace with the actual version of the chart you need
const namespace = "default"; // Define the namespace where the chart should be deployed

// Create a new Helm chart instance to deploy
const cosmosDbScaler = new kubernetes.helm.v3.Chart(chartName, {
  // Specify the chart details. If the chart is in a Helm repository,
  // you need to add a `repo` attribute with the repository URL.
  chart: chartName,
  version: chartVersion,
  namespace: namespace,
  // If the chart has any configuration values, they can be specified in the `values` attribute.
  values: {
    // Add any required chart values here
    // e.g., connection strings, resource requests/limits, etc.
  },
});

// Export the name of the namespace that the chart was deployed into
export const kubernetesNamespace = namespace;
```

Replace `1.0.0` with the correct version of the Helm chart you want to deploy. If the chart isn't publicly available in a known Helm repository, you'll have to specify the `repo` attribute with the URL of the Helm repository.

This program instructs Pulumi to deploy the `external-scaler-azure-cosmos-db` Helm chart into the `default` namespace of your OpenShift cluster. If the chart requires any configuration that isn't listed here, you need to add it to the `values` object in the Helm chart declaration.

To run this Pulumi program:

1. Save the code to a file named `index.ts` within a new Pulumi project directory.
2. Run `pulumi up` inside that directory, following the prompts provided by Pulumi.
3. Pulumi will show you a preview of the resources to be created and will ask for confirmation to proceed.

Remember that you need to be authenticated with your OpenShift cluster and have the `~/.kube/config` file correctly set up for Pulumi to be able to deploy the resources.