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

Question

Pulumi · Accepted Answer

To deploy the Ceph Helm chart on an Azure Kubernetes Service (AKS) cluster using Pulumi, you would:

Provision an AKS cluster using Azure's native provider.
Deploy the Ceph Helm chart onto the AKS cluster.

Below, you'll find a detailed program written in TypeScript that uses Pulumi to accomplish this goal. Read through the descriptions before and after the code block and the inline comments to understand what each part of the code does and why it's necessary.

First, we need to make sure that Pulumi and the necessary Pulumi packages are installed for Azure and Helm. You can install them using npm or yarn. For instance, run the following command to install them via npm:

npm install @pulumi/pulumi @pulumi/azure-native @pulumi/kubernetes

Once the necessary packages are installed, you can create a new TypeScript file, such as index.ts, and write the following program in it:

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

// Set up an AKS cluster.
const name = "ceph-aks"; // this is a suggested name, change it based on your naming conventions

// Creating a new resource group to contain the AKS cluster and related resources
const resourceGroup = new azure.resources.ResourceGroup(name);

// Creating the AKS cluster within the resource group
const cluster = new azure.containerservice.ManagedCluster(name, {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 3, // Number of nodes (VMs) to include in the cluster
        maxPods: 110,
        mode: "System",
        name: "agentpool",
        osDiskSizeGB: 30,
        osType: "Linux",
        vmSize: "Standard_DS2_v2", // Change as required for your deployment
    }],
    dnsPrefix: name,
    enableRBAC: true, // Kubernetes role-based access control
    kubernetesVersion: "1.18.14", // Specify the Kubernetes version; check Azure for the latest supported versions
    linuxProfile: {
        adminUsername: "adminuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa <public-key>", // Replace <public-key> with your SSH public key string
            }],
        },
    },
});

// Export the kubeconfig.zip for the cluster
export const kubeconfigZip = cluster.kubeconfigZip;

// Use the Kubeconfig from the generated AKS cluster to connect to the cluster with Pulumi's Kubernetes provider
const k8sProvider = new kubernetes.Provider(name, {
    kubeconfig: cluster.kubeconfig.apply(kubeconfig => Buffer.from(kubeconfig, 'base64').toString()),
});

// Deploy the Ceph Helm chart using Pulumi's Helm Release resource.
const cephRelease = new kubernetes.helm.v3.Release("ceph", {
    chart: "ceph",
    version: "6.0.0", // Replace with the desired Ceph Helm chart version
    repositoryOpts: {
        repo: "https://charts.helm.sh/stable",
    },
    namespace: "ceph", // Namespace where you want to deploy Ceph
}, { provider: k8sProvider });

// Export the Ceph cluster service endpoint
export const cephEndpoint = cephRelease.status.apply(status => status.endpoint);

This program starts by importing the necessary Pulumi packages. It then creates an Azure resource group to contain our AKS cluster. Next, it initializes the AKS cluster, specifying the number of nodes, the size of the VMs, the Kubernetes version, and other important configuration details.

After the AKS cluster is provisioned, the kubeconfig for connecting to the cluster is exported. This allows us to handle cluster operations such as installing Helm charts.

The Kubernetes provider utilizes the kubeconfig from the recently created AKS cluster. This provider is then used to install the Ceph Helm chart onto the AKS cluster. The version of the Ceph chart and the repository URL are specified. You'll need to replace the placeholder values, such as the ssh-rsa <public-key> and the Ceph Helm chart version, with the actual values you'd use for your deployment.

Finally, after deploying the Ceph Helm chart, the program exports the Ceph cluster service endpoint for you to access.

To run this program, you would use the Pulumi CLI. Save the file, and in your terminal, navigate to the directory containing the `