Deploy the flink-kubernetes-operator-crds helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the `flink-kubernetes-operator-crds` Helm chart on an Azure Kubernetes Service (AKS) cluster using Pulumi, we will follow these steps:

1. **Create an AKS Cluster**: We will define an AKS cluster using the `azure-native` provider, which allows us to interact with Azure resources natively. This will include the cluster configuration for nodes, network, and other essential settings.

2. **Install the Helm Chart**: Once we have the AKS cluster running, we will deploy the Helm chart for the Flink Kubernetes operator. This is done using the `kubernetes.helm.v3.Chart` resource which Pulumi provides for helm chart deployments in Kubernetes.

3. **Helm Chart Configuration**: We will set the `chart` name to `flink-kubernetes-operator-crds`, which is expected to be available in a public or private Helm repository. You would need to provide the repository URL if it's a private or specific public one.

Before we start writing our program, make sure you have the following prerequisites in place:

- **Pulumi**: An installation of Pulumi CLI and setup for Azure. Make sure you’ve also logged in to both Pulumi and Azure CLI (`az login`).
- **Node.js**: Install Node.js if you plan to use TypeScript for writing Pulumi programs.
- **Helm CLI**: Optionally, you can have Helm installed to inspect charts and for testing in local Kubernetes clusters.

Below is how you would implement this using Pulumi with TypeScript:

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

// Step 1: Create an AKS Cluster
const resourceGroup = new azure.resources.ResourceGroup("myResourceGroup", {
  location: "East US", // Set the location appropriately
});

const aksCluster = new azure.containerservice.ManagedCluster("myAKSCluster", {
  resourceGroupName: resourceGroup.name,
  location: resourceGroup.location,
  // Define AKS Cluster properties like node size, count, etc
  agentPoolProfiles: [{
    count: 1,
    maxPods: 110,
    mode: "System",
    name: "agentpool",
    osType: "Linux",
    vmSize: "Standard_DS2_v2", // Choose the appropriate VM size
  }],
  dnsPrefix: pulumi.interpolate`${resourceGroup.name}-kube`,
  // Enable RBAC for the cluster
  enableRBAC: true,
});

// Export the AKS cluster kubeconfig
export const kubeConfig = aksCluster.kubeConfigRaw;

// Step 2: Install the Helm Chart
const flinkOperatorChart = new k8s.helm.v3.Chart("flink-operator-crds", {
  chart: "flink-kubernetes-operator-crds",
  version: "0.1.0", // Specify the chart version you want to deploy
  // If the chart is from a custom repo, specify it as `repo: "http://your-repo-url"`.
  // Values can be specified if modifications to the default configuration are needed.
  // values: {
  //   ...
  // },
}, { provider: new k8s.Provider("k8s-provider", { kubeconfig: kubeConfig }) });

// Export the Helm chart status
export const flinkOperatorStatus = flinkOperatorChart.status;
```

Explanation:

- We import the required Pulumi libraries for Kubernetes and Azure.
- Create an Azure resource group to host our AKS cluster.
- Define and create the AKS cluster using the `ManagedCluster` resource. You may adjust the node count, VM size, and other settings as per your requirements.
- We export the generated `kubeConfig` to be used outside of Pulumi if needed.
- The `k8s.helm.v3.Chart` resource is where we specify the details of the Helm chart we wish to install. We assign it the name 'flink-operator-crds' which Pulumi will use to create the resources.
- Finally, we export the status of the Helm chart deployment using Pulumi's export feature. This allows us to check whether our deployment was successful.

Make sure to replace `version: "0.1.0"` with the actual chart version you wish to deploy. If the chart is in a private repository, you need to pass the `repo` property with the URL of the Helm repository.

With the above program, running `pulumi up` will provision the necessary resources on Azure, deploy the AKS cluster, and install the `flink-kubernetes-operator-crds` Helm chart.