Deploy the prometheus-storage-adapter helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the Prometheus Storage Adapter Helm Chart on an Azure Kubernetes Service (AKS) cluster using Pulumi, we will follow a sequence of steps which include provisioning an AKS cluster and deploying the Helm chart to it. Below is an explanation, followed by a complete Pulumi program written in TypeScript, to accomplish this task.

### Overview

We will perform the following actions:

1. Define the required Azure resource group using the `@pulumi/azure-native` package.
2. Provision an AKS cluster in the Azure resource group using the `@pulumi/azure-native` package.
3. Deploy the Prometheus Storage Adapter Helm chart to the provisioned AKS cluster using the `@pulumi/kubernetes` package.

Here's a step-by-step guide through the code:

#### Step 1: Define Azure Resource Group

Firstly, we create a new Azure resource group to logically organize our AKS cluster. This resource group will contain all the resources associated with our AKS cluster.

#### Step 2: Provision AKS Cluster

Secondly, we provision an AKS cluster within the resource group we've created. For that, we specify the AKS cluster's configuration, including the number of nodes and the node size.

#### Step 3: Configure Kubernetes Provider

Once the AKS cluster is up and running, we configure the Pulumi Kubernetes provider to target this specific AKS cluster. This includes obtaining the KubeConfig from the AKS cluster which is used by the Kubernetes provider to authenticate and communicate with the cluster.

#### Step 4: Deploy Helm Chart

Finally, we deploy the Prometheus Storage Adapter Helm chart using the `@pulumi/kubernetes` package. We set the chart's release name, repository, and version, and provide additional configuration as needed for the storage adapter.

Now, let's jump into the TypeScript program:

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

// Step 1: Create a new Azure resource group
const resourceGroup = new azure.resources.ResourceGroup("aksResourceGroup", {
    resourceGroupName: "prometheusAdapterGroup",
    location: "WestUS", // Adjust the location as needed
});

// Step 2: Provision AKS Cluster
const aksCluster = new azure.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    agentPoolProfiles: [{
        count: 2, // Number of nodes
        vmSize: "Standard_DS2_v2", // VM size for nodes
        name: "agentpool", // Node pool name
        mode: "System", 
    }],
    dnsPrefix: "aks-prometheus",
    // Enable RBAC for best security practices
    enableRBAC: true,
});

// Obtain the KubeConfig (later used to configure Kubernetes provider)
const creds = pulumi.output(azure.containerservice.listManagedClusterUserCredentials({
    resourceGroupName: resourceGroup.name,
    resourceName: aksCluster.name,
}));

const kubeconfig = creds.apply(creds => {
    const encoded = creds.kubeconfigs[0].value;
    return Buffer.from(encoded, 'base64').toString();
});

// Step 3: Set up the Kubernetes provider to connect to the AKS cluster
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Step 4: Deploy the Prometheus Storage Adapter Helm chart
const prometheusStorageAdapterChart = new k8s.helm.v3.Chart("prometheusStorageAdapter", {
    chart: "prometheus-storage-adapter",
    version: "your-chart-version", // Specify the chart version
    fetchOpts: {
        repo: "https://your-helm-chart-repository/", // Specify the Helm chart repository
    },
    // Provide values for the Helm chart
    values: {
        // Define necessary values here
    },
}, { provider: k8sProvider });

// Export the AKS cluster name and kubeconfig
export const clusterName = aksCluster.name;
export const kubeConfig = kubeconfig;
```

Make sure to replace `your-chart-version` with the actual version of the Prometheus Storage Adapter chart and `https://your-helm-chart-repository/` with the chart's repository URL. You can find the repository URL and chart version in the Helm chart's documentation or by searching Helm repositories online.

Save this file with a `.ts` extension, make sure you have Pulumi installed, and then run `pulumi up` to deploy your infrastructure.

### Conclusion

After running the above program, you'll have an AKS cluster with the Prometheus Storage Adapter deployed via Helm. This setup will allow you to use Prometheus in combination with Azure services for monitoring purposes, with storage functionalities handled by the deployed adapter.

Keep in mind that some properties and values such as the number of nodes, VM size, chart version, and repository URL should be tailored to meet your specific requirements and the latest available software versions.