Deploy the flask-app helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart for a Flask application on Kubernetes using Pulumi, you will be utilizing the `Chart` resource from the Pulumi Kubernetes provider. The `Chart` resource is a high-level component that encapsulates a collection of Kubernetes resources as represented by a Helm Chart.

In this case, you're deploying a Helm chart which could hypothetically be named `flask-app`. This will involve declaring the chart and its configuration in your Pulumi program.

Make sure you have Pulumi installed and configured to access your Kubernetes cluster, and that you have Helm installed as well if you're planning to use a Helm chart from a local directory or repository.

Below, you'll find a Pulumi TypeScript program that accomplishes the deployment. Throughout the program, you'll see inline comments that explain what each part of the code does.

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

// Define the name of the Helm chart.
const chartName = "flask-app";

// Define the settings of your Helm release.
const flaskApp = new k8s.helm.v3.Chart(chartName, {
  chart: chartName,
  // If your chart is in a remote Helm repository, you will need to provide the `repo` property.
  // For example:
  // repo: "http://myhelmrepo.org/charts",
  // If your chart has custom values, you can specify them using the `values` property.
  values: {
    service: {
      type: "ClusterIP"
    }
  },
  // Optionally, specify the namespace where the Helm chart will be deployed.
  // If not set, it will use the namespace configured for the current Pulumi context.
  namespace: "flask-namespace"
});

// Export the Service name of the Flask application.
export const serviceName = flaskApp.getResource("v1/Service", "flask-app-service").metadata.name;
```

The above program does the following:

- Imports the necessary Kubernetes package from Pulumi's library to interact with Kubernetes resources.
- Defines the Helm chart settings, including the chart's name (`flask-app`) and custom values. In this case, it's setting the Service type to `ClusterIP`.
- Deploys the chart into a specific namespace called `flask-namespace`. If you omit the namespace, it will be deployed into the default namespace of your current Kubernetes context.
- Exports the service name by querying the Service created by the Helm chart. You can access the deployed resources by their kind and name or other labels set in the chart.

**Keep in mind:** You'll need to replace the placeholder `chartName` with the actual name of the chart and provide any necessary values that your specific chart requires for customization. If your Helm chart is in a remote repository, you'll also need to specify the URL of the repository in the `repo` field. If your chart is in a local directory, set the `path` property to the folder containing the chart.

Lastly, to apply this Pulumi program, you would run `pulumi up` in your command line within the directory that contains your Pulumi program. Pulumi will perform a preview of the changes and prompt you to confirm the deployment.

Ensure that your Pulumi CLI is authenticated with your Kubernetes cluster and the Kubernetes context is configured properly to point to the cluster where you want to deploy the Helm chart.