Deploy the voltha-adapter-openolt helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the `voltha-adapter-openolt` Helm chart on Azure Kubernetes Service (AKS), we need to follow these steps:

1. **Create an AKS Cluster**: We will use the `azure-native` provider from Pulumi to provision an AKS cluster. This involves creating a resource group (if it does not exist already) and then defining the AKS cluster within it.

2. **Setup Kubernetes Configuration**: Once the AKS cluster is provisioned, we need to configure `kubectl` to connect to the new cluster. This is typically handled by Pulumi automatically when it creates the cluster.

3. **Install the Helm Chart**: We will make use of the Pulumi Kubernetes provider to deploy the Helm chart onto the AKS cluster. Helm is a package manager for Kubernetes that allows users to easily deploy applications in the form of charts. We can install the chart with default settings or provide a custom `values.yaml` configuration.

4. **Verify the Deployment**: Lastly, we verify that the Helm chart was deployed correctly, which might include checking for running Pods, Services, or any other Kubernetes resources created by the Helm chart.

Below I provide the TypeScript program that encompasses these steps. Please note that while the AKS and Kubernetes providers are being used, the `voltha-adapter-openolt` Helm chart must be available in a public or private Helm repository, and access is configured accordingly.

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

// Create a resource group if one doesn't exist
const resourceGroup = new azure_native.resources.ResourceGroup('myResourceGroup', {
    resourceGroupName: 'myResourceGroup',
    location: 'WestUS', // Change to your desired location
});

// Create the AKS cluster
const cluster = new azure_native.containerservice.ManagedCluster('myAksCluster', {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 2,
        vmSize: 'Standard_DS2_v2',
        mode: 'System',
        name: 'agentpool',
    }],
    dnsPrefix: 'myK8sCluster',
    kubernetesVersion: '1.20.7',
});

// Export the kubeconfig
export const kubeconfig = cluster.kubeConfig.apply(c => Buffer.from(c.kubeconfigs[0].value, 'base64').toString());

// Create a Kubernetes provider instance using the kubeconfig
const k8sProvider = new k8s.Provider('k8sProvider', {
    kubeconfig: kubeconfig,
});

// Deploy the Helm chart
const volthaChart = new k8s.helm.v3.Chart('voltha', {
    repo: 'myhelmrepo',            // Replace with the Helm repository name that contains the chart
    chart: 'voltha-adapter-openolt', // Replace with the actual chart name in case it differs
    // Specify any custom values.yaml configuration
    values: {
        service: {
            type: 'LoadBalancer', // or 'ClusterIP' depending on your requirements
        },
    },
}, { provider: k8sProvider });

// Export the endpoint of the LoadBalancer (if any) created by the Helm chart
export const volthaServiceEndpoint = volthaChart.getResource('v1/Service', 'voltha-adapter-openolt').status.apply(status => {
    return status.loadBalancer.ingress[0].ip;
});
```

In this program, we:

- Import the necessary Pulumi packages.
- Create a resource group specific to our deployment.
- Define an AKS cluster within the resource group and export the kubeconfig needed to communicate with the cluster from outside.
- Declare a `Provider` resource so that Pulumi uses the correct context when applying changes to our AKS cluster.
- Deploy the `voltha-adapter-openolt` Helm chart using the `Chart` resource, along with any custom configuration specified in the `values` object.
- (Optional) Export the endpoint, making it easier to interact with the deployed service.

You will need to adjust parameters such as the resource group name, cluster name, Kubernetes version, Helm repository, and chart values to match your specific requirements. After the chart is deployed, you can manage it through Pulumi or standard Kubernetes tooling like `kubectl`.