Deploy the fluentd-kubernetes-daemonset helm chart on Azure Kubernetes Service (AKS)

Question

Pulumi · Accepted Answer

To deploy the `fluentd-kubernetes-daemonset` Helm chart on an Azure Kubernetes Service (AKS) cluster with Pulumi, you would typically perform the following steps:

1. Create an AKS cluster.
2. Configure `kubectl` to connect to the AKS cluster.
3. Use the Helm Chart resource in Pulumi to deploy `fluentd-kubernetes-daemonset`.

Below is a Pulumi program in TypeScript that demonstrates these steps. This program uses the `@pulumi/azure-native` and `@pulumi/kubernetes` packages. The `azure-native` package provides resources that map directly to the Azure API, and the `kubernetes` package is used for deploying resources to a Kubernetes cluster, like the Helm chart in this case.

First, ensure that you have the necessary Pulumi and provider packages installed:

```bash
npm install @pulumi/pulumi @pulumi/azure-native @pulumi/kubernetes
```

Now, let's go through the program that would deploy `fluentd-kubernetes-daemonset` in an AKS cluster:

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

// Step 1: Create an AKS cluster.
// Replace the following parameters with your own desired settings.

const resourceGroupName = new azure.resources.ResourceGroup("resourceGroup");

const managedCluster = new azure.containerservice.ManagedCluster("aksCluster", {
    resourceGroupName: resourceGroupName.name,
    // Additional required parameters like location, dnsPrefix, agentPoolProfiles, etc.
    // must be filled out according to your specific infrastructure needs.
});

// Export the kubeconfig to connect to the AKS cluster.
export const kubeconfig = pulumi.
    all([managedCluster.name, resourceGroupName.name]).
    apply(([clusterName, rgName]) => azure.containerservice.listManagedClusterUserCredentials({
        resourceName: clusterName,
        resourceGroupName: rgName,
    })).apply(creds => Buffer.from(creds.kubeconfigs[0].value, 'base64').toString());

// Step 2: Configure kubectl to connect to the AKS cluster.
// The kubeconfig created above is used by the k8s provider to deploy Helm charts.

const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Step 3: Use the Helm chart resource to deploy fluentd-kubernetes-daemonset.

const fluentdHelmChart = new k8s.helm.v3.Chart("fluentd-helm-chart", {
    chart: "fluentd-kubernetes-daemonset",
    version: "1.12.3", // Replace this with the desired chart version.
    fetchOpts: {
        repo: "https://fluent.github.io/helm-charts",
    },
}, { provider: k8sProvider });

// Optionally, you may want to export a Helm chart resource attribute.
// It might be the status of the deployment, the name of the service, or any other useful information.

export const fluentdChartStatus = fluentdHelmChart.status;
```

What the program does:

- **Step 1:** It creates an AKS cluster inside the specified resource group. You need to provide values for the `location`, `dnsPrefix`, `agentPoolProfiles`, and any other configuration specific to your requirements that aren't covered in this generic example.

- **Step 2:** It exports the `kubeconfig` which is used to communicate with your AKS cluster. This `kubeconfig` is then utilized by the `k8s.Provider` which sets up the Pulumi Kubernetes provider to communicate with your AKS cluster.

- **Step 3:** It deploys the `fluentd-kubernetes-daemonset` Helm chart to the AKS cluster using the Pulumi `k8s.helm.v3.Chart` resource. This part of the code fetches the Helm chart from the specified Helm repo and deploys it to your cluster.

Lastly, it exports the status of the Helm chart deployment, which can be observed in the Pulumi console or by using CLI commands.

To run this program, save it to a file (e.g., `index.ts`), and execute it using the Pulumi CLI with the following commands:

```bash
pulumi stack init fluentd-on-aks
pulumi up
```

When prompted, review the changes and select `yes` to deploy the stack. After running, you will get outputs from Pulumi including the `kubeconfig` and optionally the `fluentdChartStatus` showing the deployment status of the Helm chart.