Deploy the simple-keycloak helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

Deploying the `simple-keycloak` Helm chart on Azure Kubernetes Service (AKS) requires several steps that we'll go through one by one. We'll use Pulumi's TypeScript SDK to script the process, which includes establishing an AKS cluster, installing the Helm chart, and setting up any necessary configurations. Below is a walkthrough of each step in the process, along with a program that accomplishes it.

### Step 1: Provision an AKS Cluster

First, we need an AKS cluster to deploy our Helm chart. We use the `ProvisionedCluster` resource from the `azure-native` provider to create a new AKS cluster.

### Step 2: Deploy the Helm Chart

Once we have our AKS cluster, we can deploy applications using Helm charts. Pulumi provides the `helm.sh/v3.Chart` resource for deploying Helm charts on Kubernetes.

### Step 3: Configuring the `simple-keycloak` Chart

The `simple-keycloak` Helm chart may require specific configurations such as setting admin user credentials or database connections. We'll use the `values` property of the `Chart` resource to pass a configuration object to the chart.

Now, let's translate these steps into a TypeScript program using Pulumi.

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

// Configuration variables for the AKS cluster
const name = "simplekeycloak";
const location = "East US";
const resourceGroupName = new azure_native.resources.ResourceGroup(`rg-${name}`, {
    location,
});

// Create an Azure AD application for AKS
const app = new azuread.Application("aks", {
    displayName: "aks",
});

// Create a service principal for the application
const servicePrincipal = new azuread.ServicePrincipal("aksSp", {
    applicationId: app.applicationId,
});

// Create the AKS cluster
const cluster = new azure_native.containerservice.ManagedCluster(`aksCluster-${name}`, {
    resourceGroupName: resourceGroupName.name,
    location,
    agentPoolProfiles: [{
        count: 3,
        mode: "System",
        name: "agentpool",
        vmSize: "Standard_DS2_v2",
    }],
    dnsPrefix: `${pulumi.getStack()}-kube`,
    enableRBAC: true,
    kubernetesVersion: "1.21.2",
    linuxProfile: {
        adminUsername: "testuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC...",
            }],
        },
    },
    servicePrincipalProfile: {
        clientId: app.applicationId,
        secret: servicePrincipal.applicationId,
    },
});

// Export the KubeConfig
const creds = pulumi.all([cluster.name, resourceGroupName.name]).apply(([clusterName, rgName]) =>
    azure_native.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: rgName,
        resourceName: clusterName,
    }),
);

const kubeConfig = creds.apply(creds => creds.kubeconfigs[0].value.apply(x => Buffer.from(x, 'base64').toString()));
export const kubeConfigOut = kubeConfig;

// Create a provider for the created cluster
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeConfig,
});

// Deploy the simple-keycloak Helm chart
const keycloak = new k8s.helm.v3.Chart("simple-keycloak", {
    // simple-keycloak chart repo is a placeholder, replace with the actual URL
    repo: "example-repo",
    chart: "simple-keycloak",
    version: "1.0.0",
    // Set values for the simple-keycloak chart (Update these with actual values)
    values: {
        keycloak: {
            username: "admin",
            password: "admin",
        },
    },
}, { provider: k8sProvider });

// Export the Keycloak service endpoint
export const keycloakService = keycloak.getResource("v1/Service", "simple-keycloak", "keycloak");

```

Here's what each part of the program does:

- **Resources Setup**: This section defines some basic configuration like resource group name and location. We also create a new Azure Resource Group to hold our AKS cluster.
  
- **Azure AD App and Service Principal**: We create an Azure AD application and associated service principal which will be used by AKS to interact with other Azure services.

- **Create AKS Cluster**: We use `azure_native.containerservice.ManagedCluster` to create our AKS cluster. This includes defining an agent pool, where the actual Kubernetes nodes will run.

- **Export KubeConfig**: Once the cluster is created, we retrieve the credentials needed to interact with Kubernetes and export them.

- **Kubernetes Provider**: The `Provider` resource lets Pulumi know how to interact with our Kubernetes cluster.

- **Deploy Helm Chart**: We deploy the `simple-keycloak` Helm chart using the `Chart` resource from Pulumi's Kubernetes provider. The `values` object is where you can pass the necessary configuration to the Helm chart.

This program is everything you need to deploy the `simple-keycloak` Helm chart on an AKS cluster. You will need to configure your Pulumi and Azure credentials before running it, and you may need to replace placeholders like the chart's `repo` with actual values. Run this program with the `pulumi up` command to provision the resources and deploy the Helm chart.

Deploy the simple-keycloak helm chart on Azure Kubernetes Service (AKS)

Step 1: Provision an AKS Cluster

Step 2: Deploy the Helm Chart

Step 3: Configuring the simple-keycloak Chart

Step 3: Configuring the `simple-keycloak` Chart