Deploy the rh-sso helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the RH-SSO (Red Hat Single Sign-On) Helm chart on Linode Kubernetes Engine (LKE), you will need to create a Kubernetes cluster on Linode, configure `kubectl` to communicate with your cluster, and then use Pulumi to deploy the Helm chart.

Here is a Pulumi program written in TypeScript that demonstrates how to perform these tasks. It assumes that you already have a Kubernetes cluster running on Linode and your environment is set up with the necessary credentials to interact with Linode and the Kubernetes cluster.

### Explanation

1. You will use the `@pulumi/kubernetes` package to interact with Kubernetes from Pulumi.
2. The `kubernetes.helm.v3.Chart` resource from Pulumi Kubernetes provider is ideal for deploying Helm charts.
3. You will specify the Helm chart for RH-SSO, which should be available in a known Helm chart repository.
4. The program below does not specify how to obtain the `kubeconfig` file for your LKE cluster, which you should have obtained when you set up your LKE cluster. You must ensure this `kubeconfig` is correctly pointed to by the `KUBECONFIG` environment variable or is located at the default `~/.kube/config` path for your Pulumi program to communicate with your Kubernetes cluster.

### Pulumi Program

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

// Create a provider for the existing Linode Kubernetes cluster.
// This assumes that you have a kubeconfig file configured correctly.
const provider = new kubernetes.Provider("lke", {
    kubeconfig: process.env.KUBECONFIG, // Make sure to have this environment variable set
});

// Deploy the RH-SSO Helm chart.
// Ensure you use the correct 'repo' and 'chart' value for the RH-SSO Helm chart and its specific version if required.
const rhSsoChart = new kubernetes.helm.v3.Chart(
    "rh-sso",
    {
        // Replace with the actual repository containing the RH-SSO chart.
        // The Helm repository URL where the chart is hosted and the chart name should be provided.
        // As an example, below 'repo' is a placeholder and should be replaced with the actual value.
        repo: "example-repo",
        chart: "rh-sso",
        version: "1.0.0", // specify the chart version here
        namespace: "default", // specify the namespace where you want to deploy the chart
    },
    {
        provider: provider, // specify the Kubernetes provider
    }
);

// Export the status URL which might be provided by the RH-SSO Helm chart, if available.
// This highly depends on the chart's outputs and needs to be adjusted accordingly.
export const statusUrl = rhSsoChart.status.apply(status => status.url);

```

### Explanation of the Program
- The `provider` instance is created to manage resources in your existing Kubernetes cluster on Linode.
- The `rhSsoChart` declares a new Helm chart resource to be deployed, which describes the RH-SSO software.
- The `repo` property is supposed to contain the URL of the Helm chart repository where the RH-SSO chart is kept. This must be substituted with the actual repository you'd be using.
- The `chart` and `version` properties specify the exact Helm chart and its version you want to deploy.
- The `export` statement exposes a URL or any output that the Helm chart provides, making it easily accessible outside of Pulumi. This depends on whether the RH-SSO chart provides such an output.

### Next Steps
- Install Pulumi CLI on your machine if you haven't already.
- Use `pulumi login` to connect to the Pulumi service.
- Create a new Pulumi project or use an existing one.
- Add the above code to your Pulumi program file (typically `index.ts`).
- Install the required NPM packages by running `npm install` in your project directory.
- Run `pulumi up` to preview and deploy the changes.

Please ensure you replace placeholders like `example-repo` with appropriate values for `repo` and other relevant configuration properties that match the RH-SSO Helm chart you're deploying. This might involve also setting other Helm values specific to RH-SSO which are not covered in this general example.