Deploy the prysm-validator helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the Prysm validator helm chart on Azure Kubernetes Service (AKS), we'll need to perform a few steps:

1. **Set up AKS Cluster**: We will start by setting up the AKS cluster in our Azure account.
2. **Install Helm Chart**: Once we have our AKS cluster, we will proceed to install the Prysm validator Helm chart on our cluster.

Here's a detailed program in TypeScript to deploy a Prysm validator Helm chart on AKS using Pulumi:

### Step 1: Setting Up The AKS Cluster

We're using the `azure-native` package to create a Kubernetes cluster because it provides native Azure resource definitions which give us direct access to all the features available in Azure API. We'll use the `ManagedCluster` resource for creating the AKS cluster.

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

// Create an AKS cluster.
const cluster = new azure_native.containerservice.ManagedCluster("my-aks-cluster", {
    resourceGroupName: "myResourceGroup",
    agentPoolProfiles: [{
        count: 3,
        vmSize: "Standard_DS2_v2",
        osType: "Linux",
        mode: "System",
        name: "agentpool" // name of the agent pool
    }],
    dnsPrefix: "myAKSdns",
    enableRBAC: true,
    kubernetesVersion: "1.20.7",
    linuxProfile: {
        adminUsername: "adminuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa ...", // replace with your SSH public key
            }],
        },
    },
});
```

### Step 2: Setting Up The Kubernetes Provider

Once we have the AKS cluster deployed, we'll set up the Kubernetes provider. This requires fetching the credentials to access the AKS cluster which we can achieve by invoking the `listManagedClusterUserCredentials` function.

```typescript
// Obtain the Kubernetes cluster's kubeconfig.
const creds = pulumi.all([cluster.name, cluster.resourceGroupName]).apply(([clusterName, rgName]) =>
    azure_native.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: rgName,
        resourceName: clusterName,
    }),
);

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

// Create a Kubernetes provider instance that uses our cluster's kubeconfig.
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});
```

### Step 3: Installing The Helm Chart

To install the Helm chart, you'll use `Chart` resource from `@pulumi/kubernetes`. This resource can deploy Helm charts into a Kubernetes cluster from different sources - a repository or a local path. In this case, we are assuming you have the Helm chart for Prysm validator available. If it's stored in a Helm repository, make sure to specify the correct `repo` and `chart` names.

```typescript
// Deploy the Prysm validator Helm chart into the AKS cluster.
const prysmValidatorChart = new k8s.helm.v3.Chart("prysm-validator", {
    repo: "prysmaticlabs", // repository name if available
    chart: "prysm-validator",
    // Define the chart values, which are settings that modify the behavior of the Helm chart.
    // Replace the below with actual values.
    values: {
        // Chart values here. For example, you might specify the number of replicas or other configurations.
    },
}, { provider: k8sProvider });
```

Remember to replace the placeholders (e.g. `myResourceGroup`, `ssh-rsa ...`) with actual values specific to your setup.

### Running The Pulumi Program

You'll need to run this Pulumi program with the following steps:
1. Install Pulumi if you haven't already.
2. Set up your Pulumi stack.
3. Run `pulumi up` from the command line, which will deploy the resources defined in the code.
4. Confirm the deployment in the prompt given by Pulumi.

This example sets up an AKS cluster with a sufficient default size for a workload like Prysm validator. However, you might want to tweak the AKS cluster size, Kubernetes version, or other settings based on your specific requirements for performance, cost, and compliance.

Before running the actual deployment, ensure you've set up Azure credentials on your local system for Pulumi to use and that the Kubernetes configuration generated by Pulumi has adequate permissions to deploy Helm charts.

This overall deployment will create the Azure Kubernetes Service (AKS) cluster and deploy the Prysm validator helm chart on it. Once the deployment is complete, you can use the `kubectl` command-line tool to interact with your Kubernetes cluster and manage your validator.