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

Question

Pulumi · Accepted Answer

To deploy a Java Helm chart on Azure Kubernetes Service (AKS), you need to perform a series of steps using Pulumi. The steps are as follows:

1. Create an Azure Resource Group: This is a logical container that holds related resources for an Azure solution.
2. Deploy an AKS cluster: You will use Pulumi to define and deploy an AKS cluster within the resource group you created in step 1.
3. Install the Helm chart for Java application: After the AKS cluster is ready, you will use Pulumi to deploy the Helm chart to the AKS cluster.

Here's a Pulumi TypeScript program that demonstrates these steps:

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

// Step 1: Create an Azure Resource Group
const resourceGroup = new azure.resources.ResourceGroup("myResourceGroup");

// Step 2: Deploy an AKS cluster
const aksCluster = new azure.containerservice.ManagedCluster("myAKSCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 1,
        maxPods: 110,
        mode: "System",
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
        name: "agentpool"
    }],
    dnsPrefix: "myaksdns",
    enableRBAC: true,
    kubernetesVersion: "1.18.14",
    linuxProfile: {
        adminUsername: "adminuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa ...", // replace with your SSH public key
            }],
        },
    },
    nodeResourceGroup: `MC_azure-native_go_${resourceGroup.name}`,
    servicePrincipalProfile: {
        clientId: "clientId", // replace with your service principal's client ID
        secret: "secret", // replace with your service principal's secret
    },
});

// Step 3: Publish the KubeConfig for the AKS cluster
const creds = pulumi.all([resourceGroup.name, aksCluster.name]).apply(([resourceGroupName, clusterName]) =>
    azure.containerservice.listManagedClusterUserCredentials({
        resourceGroupName: resourceGroupName,
        resourceName: clusterName,
    }));

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

// Step 4: Deploy a Helm chart
const myChart = new k8s.helm.v3.Chart("myJavaChart", {
    chart: "java", // Ensure you have the correct chart name
    version: "0.1.0", // Use the appropriate chart version
    fetchOpts: {
        repo: "https://repo-name/repo", // Specify the Helm chart repository
    },
}, { provider: new k8s.Provider("k8sProvider", { kubeconfig }) });

// Export the kubeconfig
export const kubeConfig = kubeconfig;
```

### Explanation:

- **Resource Group (`azure.resources.ResourceGroup`)**: This resource specifies the Azure resource group in which all resources will be organized.
- **AKS Cluster (`azure.containerservice.ManagedCluster`)**: Here, we're specifying the details of the AKS cluster we wish to create, such as the version of Kubernetes, the size of the node, and SSH access details. You must replace placeholder values like `ssh-rsa ...`, `clientId`, and `secret` with your actual SSH public key and service principal details, respectively.
- **KubeConfig Retrieval**: The `listManagedClusterUserCredentials` function is used to obtain the necessary credentials to interact with your AKS cluster. We then decode these credentials to form the `kubeconfig`.
- **Helm Chart Deployment (`k8s.helm.v3.Chart`)**: This resource manages the deployment of a Helm chart into the AKS cluster. You will need to specify the correct chart name, version, and repository for the Java application you wish to deploy.
- **Provider Configuration (`k8s.Provider`)**: To connect Pulumi to the correct Kubernetes cluster, we create a Kubernetes provider instance, passing in the `kubeconfig` we obtained from the AKS cluster.

Lastly, we export the `kubeconfig` as a stack output so that you can use it to interact with your AKS cluster using `kubectl`. Remember that in an actual deployment scenario, sensitive data like service principal secrets and SSH keys should not be hardcoded and should be managed securely, possibly using Pulumi's secret management or environment variables.