Deploy the ublhub helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

Deploying a Helm chart on Azure Managed OpenShift Service involves a few steps:

1. **Setting up the Azure Managed OpenShift Service**: Before you can deploy the Helm chart, you need an active OpenShift cluster. Using Pulumi, we will define the necessary resources for an OpenShift cluster running on Azure.

2. **Deploying the Helm Chart**: Once the cluster is up and running, you can then deploy your Helm chart to the OpenShift cluster. Depending on the specific requirements of the `ublhub` Helm chart, you might need to provide configuration values during the deployment process.

### Part 1: Setting up Azure Managed OpenShift Service

First off, let's begin by defining the OpenShift cluster on Azure. You will require the `azure-native` provider to create an `OpenShiftManagedCluster` resource. We need to define things like the location, resource group name, and specifics about the cluster, such as the number of nodes and VM size. Below, we'll start by creating the necessary infrastructure for the OpenShift cluster.

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as azureNative from "@pulumi/azure-native";

const location = "East US"; // Update to your preferred location

const resourceGroupName = new azureNative.resources.ResourceGroup("myResourceGroup", {
    location: location,
});

const openShiftCluster = new azureNative.containerservice.OpenShiftManagedCluster("myOpenShiftCluster", {
    resourceGroupName: resourceGroupName.name,
    location: location,
    openShiftVersion: "3.11", // Use the appropriate OpenShift version
    agentPoolProfiles: [{
        name: "agentpool",
        count: 3,
        vmSize: "Standard_DS2_v2",
    }],
    // Other required configuration for the cluster (you might need to specify additional settings)
});
```
*[Resource documentation for `OpenShiftManagedCluster`](https://www.pulumi.com//registry/packages/azure-native/api-docs/containerservice/openshiftmanagedcluster/)*

### Part 2: Deploying The Helm Chart

After the cluster has been provisioned, you can deploy your Helm chart using the `Chart` resource from the `kubernetes` package. If you are not familiar with Helm, it is a package manager for Kubernetes that allows you to define, install, and upgrade complex Kubernetes applications.

The `Chart` resource is a high-level component that succinctly encapsulates the process of deploying a Helm chart in your OpenShift cluster. Below is an example of deploying the `ublhub` chart.

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

// Assume the kubeconfig is available to the Pulumi program either via the file or the environment variable.
// This will be used to communicate with your OpenShift cluster.
const kubeconfig = pulumi.output(azureNative.containerservice.listOpenShiftManagedClusterUserCredentials({
    resourceGroupName: resourceGroupName.name,
    resourceName: openShiftCluster.name,
})).apply(creds => Buffer.from(creds.kubeconfigs[0].value, 'base64').toString());

const provider = new k8s.Provider("provider", {
    kubeconfig: kubeconfig,
});

const ublhubChart = new k8s.helm.v3.Chart("ublhub", {
    chart: "ublhub",
    // You may need to specify the repository where the Chart can be found if it's not an official Helm chart.
    // repo: "http://<helm-chart-repository>/",
    values: {
        // Define any specific configuration required by the ublhub Helm chart here.
    },
}, { provider });
```
*[Resource documentation for `Chart`](https://www.pulumi.com//registry/packages/kubernetes/api-docs/helm.sh/v3/chart/)*

The `kubeconfig` variable captures the credentials necessary to interact with the OpenShift cluster. With the kubeconfig and the Pulumi Kubernetes provider instance, you can proceed to deploy the `ublhub` Helm chart to the cluster.

Please note that this code assumes that:

- You already have the Helm chart named `ublhub` available in a Helm repository or stored locally.
- Any necessary `values` that should be applied to the Helm chart configurations are correctly defined in the `values` field.

These resources specify the minimum to get a Helm chart deployed to an Azure Managed OpenShift Service. In practice, you may need to adjust configurations to match the specific requirements for your chart and your organizational policies with regards to networking, storage, and more.