Deploy the ingress-controller helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the ingress controller Helm chart on an OpenShift cluster, we will use the Pulumi Kubernetes provider. Specifically, we will utilize the `Chart` resource from the `kubernetes.helm.v3` module to deploy a Helm chart. In this case, the ingress controller Helm chart is what we want to deploy.

Let's walk through the steps we will take in our Pulumi program:

1. Import the necessary Pulumi and Kubernetes libraries.
2. Create a Helm chart resource pointing to the ingress controller chart.
3. Configure the chart with necessary values, ensuring it fits into the OpenShift environment. You might need to set specific parameters such as namespace, the Helm repository which contains the ingress controller, and any configurations that are specific to the chart.

Below is the Pulumi TypeScript program that accomplishes these steps:

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

// Create an instance of the kubernetes.helm.v3.Chart class, which represents the ingress controller Helm chart.
const ingressControllerChart = new k8s.helm.v3.Chart("nginx-ingress", {
    // Replace with the actual chart name if different and the repository where the chart is located.
    chart: "ingress-nginx",
    // You can specify the version of the chart you want to deploy.
    // version: "x.y.z",
    // Specify the repository URL where the chart can be found.
    // You should replace this with the correct URL for the ingress controller you wish to deploy.
    // repo: "https://charts.helm.sh/stable",
    // If you have any specific values you wish to override in the chart, you can specify them here.
    // For example, you might want to set the service type to NodePort or LoadBalancer, etc.
    values: {
        controller: {
            publishService: {
                enabled: true,
            },
            service: {
                type: "LoadBalancer",
            },
        },
    },
    // If you're deploying to a specific OpenShift namespace, specify it here.
    // namespace: "ingress-namespace",
}, {
    // OpenShift's Helm support requires some specific configurations that you can enable through transformations.
    // These might involve setting security contexts, specifying OpenShift-specific annotations, etc.
    transformations: [
        // Add your transformations here.
    ],
});

// Export the ingress controller's service URL if possible, which can be used to access the deployed services.
export const ingressUrl = ingressControllerChart.getResourceProperty("v1/Service", "nginx-ingress-controller", "status");
```

In the code above, you need to replace the placeholder values with the actual values suitable for your Helm chart and OpenShift environment. The `values` object is where you can specify configuration options that are specific to the ingress controller chart that you're deploying. These might involve custom controller configurations, resource requests and limits, affinity settings, and more, depending on the requirements of your deployment and the features of your chosen ingress controller.

The `transformations` option allows you to modify the generated Kubernetes resources before they are applied to the cluster. This can be useful in OpenShift or any other Kubernetes distribution that requires specific settings that are not included in the default Helm chart.

Finally, we export the `ingressUrl` which attempts to obtain the ingress controller's service URL. Depending on how you configure the ingress controller, this might be the external IP that you can use to access the ingress resources. However, note that this value may not be immediately available and could require you to wait until the service is fully provisioned and has an external IP assigned.

To run this Pulumi program, you would use the following commands in your terminal:

- Initialize a new Pulumi project (if you haven't done so already):

```shell
pulumi new typescript
```

- Place the program into the `index.ts` file within your Pulumi project directory.
- Run `pulumi up` to preview and deploy the changes. Pulumi CLI will show you a preview of the resources that will be created. After reviewing, you can choose to proceed with the deployment.

Remember to ensure that `pulumi` and the necessary Pulumi providers are installed on your system and you have configured Pulumi to access your OpenShift cluster. The OpenShift cluster should also be accessible via `kubectl`; this typically involves login credentials and sometimes specific configurations to access your OpenShift cluster.