Deploy the postgres-with-operator helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the `postgres-with-operator` Helm chart on Azure Kubernetes Service (AKS), you will go through several steps:

1. **Set up an AKS Cluster**: First, you need an AKS cluster where you can deploy the Helm chart. You will create a resource group and then create an AKS cluster within that resource group.

2. **Deploy Helm Chart**: Once the AKS cluster is running, you can deploy the `postgres-with-operator` Helm chart on the cluster. Pulumi provides a resource type for Helm charts that can be used to deploy charts from a repository or a local path.

3. **Configure Access to the Cluster**: After the Helm chart is deployed, you will need to obtain credentials to access your AKS cluster.

Here's how you could write a Pulumi program in TypeScript to deploy the `postgres-with-operator` Helm chart onto an AKS cluster. This program uses Pulumi's Azure and Kubernetes packages to create the necessary resources and deploy the Helm chart.

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

// Step 1: Create a resource group.
const resourceGroup = new azure.core.ResourceGroup("aksResourceGroup", {
    location: "East US", // You can choose a different location.
});

// Step 2: Create AKS cluster.
const aksCluster = new azure.containerservice.KubernetesCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    defaultNodePool: {
        name: "akspool",
        nodeCount: 2, // You can specify a different number of nodes as required.
        vmSize: "Standard_DS2_v2", // This determines the size of VMs used for nodes.
    },
    dnsPrefix: `${pulumi.getStack()}-kube`, // Ensure that the DNS prefix is unique.
    identity: {
        type: "SystemAssigned", // Use system-assigned managed identity for the cluster resources.
    },
});

// Step 3: Use the AKS cluster as a provider for deploying Helm chart.
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: aksCluster.kubeConfigRaw, // Use the kubeconfig to set up the Kubernetes provider.
});

// Step 4: Deploy the `postgres-with-operator` Helm chart.
const postgresqlChart = new k8s.helm.v3.Chart("postgresql-chart", {
    chart: "postgres-operator",
    fetchOpts: {
        repo: "https://charts.bitnami.com/bitnami", // Assuming this is the repository for the chart.
    },
    // Optionally, you can specify `values` to customize the deployment.
    // values: { /* Your custom values here */ },
}, { provider: k8sProvider }); // Uses the AKS cluster as a provider to deploy the Helm chart.

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

```

In this code:

- We start by importing the necessary modules from Pulumi's Azure and Kubernetes libraries.
- We create a resource group to hold the AKS cluster using `azure.core.ResourceGroup`.
- We create the AKS cluster with `azure.containerservice.KubernetesCluster`.
- We use the generated kubeconfig from our AKS cluster to interact with it using a Kubernetes provider.
- We deploy the `postgres-with-operator` Helm chart using `k8s.helm.v3.Chart`. We assume that the Helm chart is available in the Bitnami Helm charts repository.

To apply this Pulumi code:

1. Save the code to a file with a `.ts` extension, like `index.ts`.
2. Run `pulumi up` in the same directory as your file to create the resources. You will be prompted to log in to the Pulumi service if you haven't already done so.

After deploying:

- The `kubeconfig` is exported, which you can use to access your Kubernetes cluster using Kubernetes tools such as `kubectl`.
- You can check the status of your Helm release with `kubectl` or by using Pulumi's stack output.