Deploy the twitter-app helm chart on Azure Managed Openshift Service

Question

Pulumi · Accepted Answer

Deploying the Twitter-app Helm chart on Azure Managed OpenShift Service involves several steps. First, you need to set up the Azure managed OpenShift cluster, and then you can deploy your application with Helm. Below is a detailed explanation of how to write a Pulumi program in TypeScript that automates this process.

### Prerequisites
Ensure you have the following prerequisites met before you proceed:
- Pulumi CLI installed
- Azure account and Azure CLI set up with credentials configured
- An existing or new Pulumi project

### Overview of the Pulumi Program
Here's the outline of what we're going to do in the Pulumi program:
- Define an Azure Managed OpenShift cluster using the `azure-native.containerservice.OpenShiftManagedCluster` resource.
- Install the Helm chart on the OpenShift cluster using the Helm Chart resource from the `kubernetes.helm.sh/v3` package.

### Pulumi Program for Azure Managed OpenShift Service and Helm chart deployment

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as azure_native from "@pulumi/azure-native";
import * as k8s from "@pulumi/kubernetes";

// Create an Azure resource group
const resourceGroup = new azure_native.resources.ResourceGroup("twitterappResourceGroup", {
    resourceGroupName: "twitterapp-rg",
    location: "East US",
});

// Create an OpenShift managed cluster
const openshiftCluster = new azure_native.containerservice.OpenShiftManagedCluster("twitterappOpenShiftCluster", {
    resourceName: "twitterappCluster",
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    openShiftVersion: "4.3", // Replace with the desired OpenShift version
    // The following are placeholder values. Replace them with the actual parameters required for your cluster.
    // More details here: https://www.pulumi.com/registry/packages/azure-native/api-docs/containerservice/openshiftmanagedcluster/
    networkProfile: {
        vnetCidr: "10.0.0.0/8",
    },
    masterPoolProfile: {
        count: 3,
        vmSize: "Standard_D4s_v3",
    },
    agentPoolProfiles: [{
        name: "agentpool",
        count: 3,
        vmSize: "Standard_D4s_v3",
        osType: "Linux",
    }],
    // ... Additional parameters as necessary
});

// Provisioning the Kubernetes provider to deploy Helm charts to the OpenShift cluster
// Here we use the OpenShift cluster's kubeconfig for the Kubernetes provider.
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: openshiftCluster.kubeConfigRaw,
});

// Deploy the "twitter-app" Helm chart
const twitterAppChart = new k8s.helm.v3.Chart("twitterAppChart", {
    chart: "twitter-app",
    version: "1.0.0", // Replace with your chart's version
    fetchOpts: {
        repo: "http://myhelmrepo.com/charts", // Replace with your Helm chart's repository URL
    },
    // Values from your Helm chart's 'values.yaml' go here
    // values: { ... },
}, { provider: k8sProvider });

// Export the OpenShift managed cluster's API server URL
export const openshiftApiServerUrl = openshiftCluster.publicHostname;
```

### Explanation
- We first create an Azure Resource Group to organize all resources related to our OpenShift cluster in one container.
- Next, we define the OpenShift Managed Cluster by specifying parameters such as version, network profile, VM sizes, etc.
  - The `openShiftVersion` should be set to the desired OpenShift version that supports your Helm chart.
  - The `networkProfile` contains networking settings for the cluster. In this example, we use a placeholder CIDR block for the VNet.
  - The `masterPoolProfile` and `agentPoolProfiles` define the size and number of master and agent nodes in your cluster.
- We instantiate a Kubernetes provider using the kubeconfig that the OpenShift cluster returns. This allows us to interact with the OpenShift cluster from Pulumi.
- Using the Kubernetes provider, we deploy the Helm chart by specifying the chart name and version, along with the Helm repository containing the chart.
- An export is provided at the end to output the API server URL of the OpenShift cluster. This can be useful for further interactions with the cluster.

Remember to replace placeholder values with actual values that correspond to your Azure subscription and the Helm chart details for the Twitter app.

Before applying this Pulumi program, please consult the Pulumi documentation and Azure OpenShift documentation to understand all the parameters needed, and ensure your Helm chart and values are correctly configured.