Deploy the moon helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the Moon Helm chart on Azure Kubernetes Service (AKS), we'll take the following steps using Pulumi:

1. **Provision an Azure Kubernetes Service (AKS) Cluster**: We will use the `azure-native` Pulumi provider to provision an AKS cluster in your Azure account. The configuration will specify the necessary properties such as location, node count, VM size, and others.
   
2. **Deploy Helm Chart to AKS**: Once we have an AKS cluster, we will deploy the Moon Helm chart to it. We will use the `kubernetes` Pulumi package which has support for Helm charts.

Below is the complete TypeScript program that sets up the AKS cluster and deploys the Moon Helm chart. Please ensure you have Pulumi CLI installed and configured with your Azure credentials to run this program.

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

// Step 1: Create the AKS cluster
const resourceGroup = new azure_native.resources.ResourceGroup('myResourceGroup', {
    // Set a location for the resource group
    location: 'WestUS',
});

const aksCluster = new azure_native.containerservice.ManagedCluster('myAksCluster', {
    // Reference the Resource Group that was just created
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        // Define the characteristics of the node pool
        count: 2, // It's recommended to have at least two nodes for redundancy.
        vmSize: 'Standard_DS2_v2', // This is an example VM size; adjust as necessary.
        mode: 'System',
        osType: 'Linux',
        name: 'agentpool', // Name for the node pool
    }],
    dnsPrefix: 'aks', // DNS prefix for the AKS cluster
    // Optional: define other AKS properties here
});

const creds = pulumi.all([resourceGroup.name, aksCluster.name]).apply(([rgName, clusterName]) => 
    azure_native.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: rgName,
        resourceName: clusterName,
    })
);

const kubeconfig = creds.apply(c => {
    const encoded = c.kubeconfigs[0].value;
    if (encoded === undefined) {
        throw new Error("Kubeconfig is undefined");
    }
    return Buffer.from(encoded, 'base64').toString();
});

// Step 2: Deploy the Moon Helm Chart to the AKS cluster
const k8sProvider = new k8s.Provider('k8sProvider', {
    // Supply the kubeconfig from AKS cluster we created
    kubeconfig: kubeconfig,
});

// Define the Helm chart for Moon
const moonChart = new k8s.helm.v3.Chart('moon-chart', {
    // Reference for Helm chart - you will need to provide the chart name and version
    chart: 'moon', 
    version: '1.0.0', // Replace with the desired chart version
    fetchOpts: {
        // Specify the repository from which to fetch the chart
        // Replace 'https://charts.your-repo.com/' with the actual Helm chart repo URL
        repo: 'https://charts.your-repo.com/',
    },
    // Use `values` to supply any necessary configuration for the chart
    values: {
        // You must fill out these values according to your deployment needs
        // For example:
        // replicaCount: 2,
        // service: {
        //   type: 'LoadBalancer',
        // },
        // Check the chart's documentation for a full list of configurable values
    },
}, { provider: k8sProvider });

// Export the kubeconfig and the IP address of the service, so you can connect to the Moon instance
export const kubeconfigOutput = kubeconfig;
export const serviceIP = moonChart.getResourceProperty('v1/Service', 'moon-chart-moon', 'status').apply(status => status.loadBalancer.ingress[0].ip);
```

**Explanation**:

- We create an AKS cluster with two nodes for redundancy. Each node is a virtual machine that will be part of the Kubernetes cluster. You may need to change the SKU (`vmSize`) depending on your workloads.

- Once the cluster is created, we retrieve the kubeconfig, which is used by the Kubernetes clients to communicate with the Kubernetes cluster.

- With kubeconfig and a Kubernetes Pulumi provider, we create an instance of a Helm chart for 'Moon'. The `repo` and `version` are placeholders and should be replaced with the actual Helm repository URL and the chart version you intend to deploy.

- Values for the Helm chart can be specified in the `values` property. Since these are highly dependent on the specific Helm chart and what you want to configure, it's important to refer to the 'Moon' Helm chart documentation for the exact values that should be used.

- Finally, your Pulumi program exports the kubeconfig required to connect to your AKS cluster and the external IP address of the Moon service.

**Next Steps**:

- Save the code to a file with a `.ts` extension.
- Run `pulumi up` within the folder containing the file to create the resources.
- Pulumi CLI will show you a preview of the resources that will be created. If you're satisfied with the preview, confirm the deployment to proceed.
- After the deployment is complete, use the exported kubeconfig to configure kubectl or any Kubernetes client, and connect to your AKS cluster.

Please replace the placeholders (like the repository URL or the chart configuration values) with the actual names and settings required for the Moon Helm chart that you'd like to deploy.