Deploy the python-webapp helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `python-webapp` Helm chart on an OpenShift cluster using Pulumi, we will use the `kubernetes.helm.sh/v3.Chart` resource from the Pulumi Kubernetes provider. This resource allows you to deploy a Helm chart into a Kubernetes cluster, which OpenShift is a distribution of.

Here is the step-by-step explanation and the corresponding TypeScript program to achieve this:

1. **Prerequisite:** Before beginning, you must have access to an OpenShift cluster and have the `kubectl` command-line tool configured to communicate with the cluster. Ensure you have installed Pulumi and set up your Pulumi project appropriately.

2. **Provider Configuration:** You do not need to explicitly configure the Kubernetes provider if your `kubectl` is already configured to communicate with your cluster, as Pulumi uses the same configuration.

3. **Creating a Helm Chart Resource:** Use the `kubernetes.helm.sh/v3.Chart` resource to deploy your `python-webapp` chart. You'll need to specify the chart name and, optionally, other details like the chart version, any custom values, and the namespace where you want to deploy the chart.

4. **Deploying the Chart:** Once the Pulumi program is ready, you can deploy the Helm chart using the Pulumi CLI with the commands `pulumi up`, which will provision the resources defined in the program in your OpenShift cluster.

Now, here is the corresponding Pulumi program in TypeScript:

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

// Set up a Pulumi Kubernetes provider to interact with the given OpenShift cluster.
const openshiftProvider = new k8s.Provider("openshift-provider", {
    // Assuming that the Pulumi-Kubernetes setup will use existing kubeconfig from .kube/config.
    // Ensure that your current kubeconfig context is set to your OpenShift cluster.
});

// Deploy the 'python-webapp' Helm chart on the OpenShift cluster.
const pythonWebappChart = new k8s.helm.v3.Chart("python-webapp", {
    // Replace with the actual repo URL or chart reference and version.
    repo: "myhelmrepo", // Example placeholder
    chart: "python-webapp",
    version: "1.2.3", // specify the chart version you desire to deploy, if applicable
    namespace: "my-namespace", // specify the namespace where to deploy, if you have a specific one
    // Include additional configurations like values (similar to helm values.yaml).
    values: {
        // Provide any values that you want to override in values.yaml.
        // For instance, for a Python web app, you might want to specify replicaCount or service type.
        replicaCount: 2,
        service: {
            type: "ClusterIP",
        },
    },
}, { provider: openshiftProvider }); // Ensure you reference the Provider pointing to your OpenShift cluster

// If you need to export any values like the service endpoint, you can do it here.
export const webappServiceUrl = pythonWebappChart.getResourceProperty("v1/Service", "python-webapp-service", "status");

// To deploy this, you would execute `pulumi up` in your command line, while in the Pulumi project directory.
```

In the example above, replace the placeholder values (`myhelmrepo`, `1.2.3`, `my-namespace`) with actual values corresponding to your `python-webapp` chart. You must have a Helm chart repository that contains your `python-webapp` chart or have the Helm chart files accessible locally.

The `values` we set are placeholders, and in a real-world scenario, these would align with configurable parameters defined in your Helm chart's `values.yaml` file.

Finally, running the `pulumi up` command will execute the deployment. It will show a preview of the actions Pulumi will take and, after confirmation, it will apply the changes, which will result in the deployment of the `python-webapp` Helm chart to your OpenShift cluster.

Monitor the command output to ensure the deployment is successful, and check for any returned URLs or endpoints if those resources are part of your Helm chart, which you can use to access your Python web application.