Deploy the nginxdemo helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the nginxdemo Helm chart on an OpenShift cluster using Pulumi, we'll use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider. Helm charts help define, install, and upgrade even the most complex Kubernetes applications.

Before running this code, make sure you have access to an OpenShift cluster and have configured your `kubectl` to point to it. This is necessary because Pulumi uses the Kubernetes context from `kubectl` to interact with your cluster.

Here's the TypeScript program that deploys the nginxdemo Helm chart:

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

// Create a namespace for the nginxdemo Helm chart
const namespace = new k8s.core.v1.Namespace("nginxdemo-namespace", {
    metadata: {
        name: "nginxdemo"
    }
});

// Deploy the nginxdemo Helm chart
const nginxdemoChart = new k8s.helm.v3.Chart("nginxdemo", {
    repo: "bitnami",
    chart: "nginx",
    version: "9.3.0", // Replace with the version of your choice
    namespace: namespace.metadata.name,
    fetchOpts:{
        repo: "https://charts.bitnami.com/bitnami",
    },
}, { dependsOn: [namespace] });

// Export the namespace and chart name
export const nginxdemoNamespace = namespace.metadata.name;
export const chartName = nginxdemoChart.name;
```

### Explanation

Let's understand what's happening in the program:

1. We import the Pulumi Kubernetes package, which allows us to interact with Kubernetes resources.
2. We create a Kubernetes namespace called `nginxdemo-namespace` where we will deploy our Helm chart. It's best practice to deploy applications within their namespaces for better organization and security.
3. We create a `Chart` resource using the `kubernetes.helm.v3.Chart` class. In the parameters, we specify:
   - The repository that contains the chart (`bitnami` in this case).
   - The name of the Helm chart (`nginx`) which is part of the bitnami collection.
   - The version of the chart to use (in this case, `9.3.0` - you may need to update this to the version you wish to deploy).
   - The namespace where the chart will be deployed, which we reference from the created namespace object.
   - Additional fetch options such as the URL of the Helm repository.
4. We use a dependency declaration `{ dependsOn: [namespace] }` to ensure that the Helm chart deployment waits until the namespace is created before it begins.
5. We export two variables: `nginxdemoNamespace` and `chartName`. These exports allow us to retrieve the namespace and the release name from the Pulumi deployment if needed. For instance, you could use these names to interact with the deployment using `kubectl`.

Make sure to install the necessary Pulumi and Kubernetes client packages before running this Pulumi program. This program will deploy the nginxdemo using the specified Helm chart to your OpenShift cluster.

After running the Pulumi program, you can verify the deployment by checking the resources within the `nginxdemo` namespace with `kubectl get all -n nginxdemo`.

The version number `9.3.0` is given as an example; you should replace it with the actual version number you intend to use. The repository bitnami may or may not contain a chart named `nginx`, which is also used as an example. If you want to deploy a particular application chart known as `nginxdemo`, ensure that you know the correct repository that hosts the chart, the correct chart name, and version.

Please refer to the Bitnami charts repository at https://github.com/bitnami/charts, if you are specifically looking for Bitnami Helm charts for usage with OpenShift or Kubernetes.