Deploy the traefik2 helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the Traefik v2 Helm chart on an OpenShift cluster using Pulumi, you'll need to use the Pulumi Kubernetes provider. Helm charts are a great way to package and deploy applications on Kubernetes, and Traefik is a popular ingress controller that can route traffic to your Kubernetes applications.

Here's a detailed step-by-step program to accomplish your goal using Pulumi with TypeScript:

1. **Setting up the Kubernetes Provider**: 
   - We need to connect Pulumi with our OpenShift Kubernetes cluster. This is done via the Kubernetes provider, which uses the Kubernetes configuration file (often located at `~/.kube/config`) to connect to the cluster. You should have the `kubeconfig` file ready and accessible by Pulumi.

2. **Creating a Helm Chart Resource**:
   - We will use the `Chart` resource provided by Pulumi's Kubernetes provider to deploy the Traefik v2 Helm chart. 
   - The `Chart` resource is a representation of a Helm chart which can be deployed into a Kubernetes cluster. In this case, we specify `traefik` as the chart we want from the corresponding Helm repository.
   
3. **Configuring the Helm Chart**:
   - You can customize the installation by providing your own `values`. These values override the defaults set by the Helm chart.
   
4. **Namespace**:
   - It’s best practice to deploy applications within their own Kubernetes namespace. You can either create a namespace resource with Pulumi or specify an existing one.
   
Now, let’s translate this into a Pulumi program in TypeScript:

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

// Use an existing kubeconfig context (like OpenShift) to connect to the cluster
const provider = new k8s.Provider('openshift-provider', {
  kubeconfig: process.env.KUBECONFIG, // Assuming KUBECONFIG env var is set
});

// Define the namespace to deploy Traefik to, or use an existing one
const ns = new k8s.core.v1.Namespace('traefik-ns', {
  metadata: { name: 'traefik' },
}, { provider });

// Deploy Traefik v2 helm chart within the desired namespace
const traefikChart = new k8s.helm.v3.Chart('traefik', {
  chart: 'traefik',
  namespace: ns.metadata.name, // use the namespace created above
  fetchOpts: {
    repo: 'https://helm.traefik.io/traefik',
  },
  version: '9.18.2', // Replace with the version of Traefik chart you wish to deploy
}, { provider });

// When running `pulumi up`, Pulumi will create the Helm chart which in turn,
// creates all the Kubernetes resources defined by the Traefik v2 Helm chart
// in your OpenShift cluster.
```

In the code above, replace `'9.18.2'` with the specific chart version you want to deploy, or omit the `version` property to deploy the latest version. The `repo` URL should point to the Traefik Helm repository where the chart can be found.

You need to ensure that the environment variable `KUBECONFIG` is set to the path of your kubeconfig file, or directly inject the kubeconfig file content into `kubeconfig` field.

Run this code using Pulumi CLI through the following steps:

- Install the Pulumi CLI and set up the OpenShift Kubernetes environment as needed.
- Save the code into a file with a `.ts` extension (for example, `deployTraefik.ts`).
- Run `pulumi up` in the same directory as your TypeScript file to create the Kubernetes resources defined by the chart.

The Traefik v2 Helm chart will be installed in the specified namespace on your OpenShift cluster, and you can then configure routing to your applications as needed.

For more information on using Helm charts with Pulumi and configuring the Kubernetes provider, please refer to the [Pulumi Kubernetes provider documentation](https://www.pulumi.com/docs/reference/pkg/kubernetes/).