Deploy the janisterminal helm chart on Opensshift

Question

Pulumi · Accepted Answer

Deploying a Helm chart on an OpenShift cluster using Pulumi involves several steps. I'll explain the core steps and write a full TypeScript program that handles deployment.

Pulumi enables you to define and manage infrastructure using code, which includes tasks like deploying a Helm chart to a Kubernetes cluster. With OpenShift, the process is very similar to deploying on a standard Kubernetes cluster with some slight variations that are specific to OpenShift, such as security constraints and different default project structures.

In Pulumi, Kubernetes resources can be managed by importing the `@pulumi/kubernetes` package, which includes support for deploying Helm charts with the `Chart` resource.

For this example, you first need to make sure you have an existing OpenShift cluster and that you're configured to connect to it using `kubectl`.

Here's a complete Pulumi program in TypeScript for deploying the "janisterminal" Helm chart to an OpenShift cluster:

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

// Ensure you have access to the OpenShift cluster and the kubeconfig is correctly set up.

// Create a Helm Chart resource, specifying the Chart name, version, and repository URL.
// The repository URL should point to the Helm repository that hosts the 'janisterminal' chart.
// If specific values or configurations need to be overwritten in the chart,
// include them in the `values` property.

const janisterminalChart = new k8s.helm.v3.Chart("janisterminal", {
    chart: "janisterminal", // Replace with the exact chart name if different.
    version: "1.0.0", // Specify the appropriate chart version.
    // Replace with the correct repository URL hosting the janisterminal chart.
    fetchOpts: { 
        repo: "https://charts.example.com/", 
    },
    // Include any custom values you need to define.
    values: {
        // Define any values here that you want to override, for example:
        service: {
            type: "ClusterIP",
        },
    },
    // Specify the OpenShift namespace where this chart will be deployed.
    // Replace 'default' with the correct namespace if different.
    namespace: "default",
});

// To reach the deployed application, you might need the Service URL.
// This will fetch the Service created by the Helm chart if it's exposing one.
// Replace 'serviceName' with the name of the service defined within the janisterminal chart.
// You can find this information in the chart's 'service' specification or documentation.
export const serviceUrl = janisterminalChart.getResourceProperty("v1/Service", "serviceName", "status.loadBalancer.ingress[0].hostname");

```

This code will deploy the "janisterminal" Helm chart to the specified namespace in your OpenShift cluster, with the specified version and optional overridden values.

- The `chart` property must match the name of the chart in the Helm repository.
- The `version` property specifies which version of the chart to deploy. Adjust this according to the available chart versions.
- In `fetchOpts.repo`, be sure to replace the placeholder URL with the actual URL of the Helm repository that contains the "janisterminal" chart.
- `values` can be adjusted based on the chart's configurable options, which you can typically find in the chart's `values.yaml` file or in its documentation.
- Replace "default" with the actual OpenShift namespace you wish to deploy the chart into.
- The `export` statement at the end is for accessing the URL of the service that gets created when the chart is deployed. Replace "serviceName" with the actual service name as specified in the chart.

Please note that using Pulumi with OpenShift assumes that you have the appropriate permissions to deploy resources. OpenShift is often more restrictive with its permissions compared to vanilla Kubernetes, so ensure your Pulumi identity or ServiceAccount has the necessary RBAC permissions in the cluster.

After preparing this Pulumi program, you can run it using the Pulumi CLI:

1. Initialize a new Pulumi project if you haven't yet.
   ```sh
   pulumi new typescript
   ```
2. Install the required dependencies.
   ```sh
   npm install @pulumi/kubernetes
   ```
3. Place the above TypeScript code in your `index.ts` file.
4. Preview the deployment.
   ```sh
   pulumi preview
   ```
5. If everything looks correct, deploy the chart.
   ```sh
   pulumi up
   ```

This will start the deployment process. Once complete, if the chart exposes a service, you'll get the service URL as output, which you can use to access your deployed "janisterminal" application.