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

Question

Pulumi · Accepted Answer

To deploy the `fastapi-app` Helm chart on Azure Managed OpenShift Service using Pulumi, we'll perform several steps:

1. **Setting up an Azure Managed OpenShift Cluster**: OpenShift is a Kubernetes-based platform that allows for easy application deployment and management. Azure offers OpenShift as a managed service, which abstracts away much of the underlying infrastructure management. We'll create an Azure OpenShift Managed Cluster using the `azure-native.containerservice.OpenShiftManagedCluster` resource.

2. **Deploying Helm Chart on OpenShift**: Helm is a package manager for Kubernetes that allows you to define, install, and upgrade applications using Charts, which are pre-configured sets of resources for a Kubernetes application. We'll use the `kubernetes.helm.sh/v3.Chart` resource provided by Pulumi's Kubernetes provider to deploy the `fastapi-app` chart on our OpenShift cluster.

Here's a TypeScript program that walks you through the process. Please make sure you have all the necessary prerequisites, like an Azure subscription, Pulumi CLI installed, and configured to connect to your Azure account before running this code.

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

// Step 1: Create an Azure Resource Group
const resourceGroup = new azureNative.resources.ResourceGroup("myResourceGroup", {
    resourceGroupName: "myResourceGroup",
    location: "East US", // You can choose your preferred Azure region
});

// Step 2: Set up Azure Managed OpenShift Cluster
// Note: OpenShift Managed Clusters require specific naming rules and might have additional
// configuration requirements, check Azure docs for more information.
const openshiftCluster = new azureNative.containerservice.OpenShiftManagedCluster("myOpenShiftCluster", {
    resourceName: "myOpenShiftCluster",
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    openShiftVersion: "4.3", // Please specify a valid OpenShift version
    // Specify any additional OpenShiftManagedCluster properties that you need.
    // The example assumes most options as default or demonstrates minimal configuration.
    masterPoolProfile: {
        count: 3,
        vmSize: "Standard_D4s_v3",
    },
    // Ensure you configure the necessary network settings, service principal, and other important properties,
    // which may require setting up in advance.
    agentPoolProfiles: [{
        name: "agentpool",
        count: 3,
        vmSize: "Standard_D4s_v3",
        osType: "Linux",
    }],
    // ...
    // Additional configuration here
    // ...
});

// Step 3: Install the fastapi-app Helm chart
// This will require connecting Pulumi with our OpenShift Kubernetes cluster, usually done
// by obtaining the Kubeconfig of the OpenShift cluster and feeding it to the Pulumi Kubernetes provider.
const kubeConfig = // ... obtain the kubeconfig for your OpenShift cluster ...

const k8sProvider = new k8s.Provider("openshiftK8sProvider", {
    kubeconfig: kubeConfig,
});

// Deploying fastapi-app Helm chart using the `Chart` resource.
const fastapiAppChart = new k8s.helm.v3.Chart("fastapi-app", {
    chart: "fastapi-app",
    version: "1.0.0", // Specify the chart version you want to deploy.
    namespace: "default", // Target namespace or create a new one if required.
    values: {
        // ... include any necessary values to override the defaults in the fastapi-app chart ...
    },
}, { provider: k8sProvider });

// Now, Pulumi knows how to create an OpenShift cluster and deploy the Helm chart on it.
// Note: The actual deployment may require more specific values and configurations based on
// the Helm chart you choose and the requirements of your application.
```

To use this program:

1. Create a new directory, navigate to it, and run `pulumi new typescript`.
2. Replace the contents of `index.ts` with the code provided above.
3. Be sure to retrieve the kubeconfig for your OpenShift cluster and include it in the code where commented.
4. Run `npm install` to get the required dependencies.
5. Run `pulumi up` to deploy your infrastructure.

After running `pulumi up`, the Pulumi CLI will show you a preview of the resources that it will create. If everything looks good, confirm the deployment, and Pulumi will proceed with creating the Azure OpenShift cluster and deploying the `fastapi-app` Helm chart onto it.

Remember to check the specifics for naming and configuring OpenShift Managed Clusters in the Azure documentation, as there might be region or subscription-specific requirements or limitations. The `fastapi-app` Helm chart may also have configuration options you'll need to be aware of to properly set up the application.