Deploy the prometheus-mixin helm chart on Azure Kubernetes Service (AKS)

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Pulumi · Accepted Answer

To deploy the Prometheus-mixin Helm chart on Azure Kubernetes Service (AKS), you need to complete a series of steps:

1. **Set up an AKS cluster**: Before deploying any application, you'll need a Kubernetes cluster. AKS makes it easy to deploy a managed Kubernetes cluster in Azure.

2. **Install Helm**: Helm is a package manager for Kubernetes, simplifying the process of managing Kubernetes applications.

3. **Add the Helm chart repository**: The repository that contains the Prometheus-mixin Helm chart must be added to Helm.

4. **Deploy the Helm chart**: Using the `helm` command, you can deploy the Prometheus-mixin Helm chart on your AKS cluster.

5. **Configure access to the cluster**: To interact with your AKS cluster, you need to set up `kubectl` (the Kubernetes command-line tool) and configure it to communicate with your cluster.

6. **Verify the deployment**: After the deployment is completed, verify that Prometheus is running successfully.

The following Pulumi program in TypeScript will guide you through setting up an AKS cluster and deploying the Prometheus-mixin Helm chart:

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

// Step 1: Create a new AKS cluster.
const resourceGroup = new azure_native.resources.ResourceGroup("myResourceGroup");

const cluster = new azure_native.containerservice.ManagedCluster("myAksCluster", {
    resourceGroupName: resourceGroup.name,
    agentPoolProfiles: [{
        count: 2,
        maxPods: 110,
        mode: "System",
        osType: "Linux",
        vmSize: "Standard_DS2_v2",
        name: "agentpool"
    }],
    dnsPrefix: `${pulumi.getStack()}-kube`,
    enableRBAC: true,
    kubernetesVersion: "1.21.1",
    linuxProfile: {
        adminUsername: "azureuser",
        ssh: {
            publicKeys: [{
                keyData: "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCd3cL1vj...",
            }]
        }
    },
    nodeResourceGroup: `MC_azure-native-go_${pulumi.getStack()}`,
    resourceGroupName: resourceGroup.name,
});

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

// Step 2: Set up the Kubernetes Provider using the AKS cluster's kubeconfig.
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig
});

// Step 3: Add the Helm repository containing the prometheus-mixin Helm chart.
// Documentation on using Helm charts with Pulumi: https://www.pulumi.com/docs/reference/pkg/kubernetes/helm/v3/chart/.
const prometheusMixinChart = new k8s.helm.v3.Chart("prometheus-mixin", {
    chart: "prometheus-mixin",
    version: "your_prometheus_mixin_version",
    fetchOpts: {
        repo: "http://example.com/path/to/your/helm/charts" // Replace with the correct repository URL
    }
}, { provider: k8sProvider });

// Export the status of the deployed Helm chart.
export const prometheusMixinStatus = pulumi.all([prometheusMixinChart.status]);
```

### Explanation of the Pulumi Program:

- We define a **resource group** using `azure_native.resources.ResourceGroup` to organize all the resources.
  
- We create an **AKS cluster** with an `azure_native.containerservice.ManagedCluster` instance, specifying the desired node count, VM size, Kubernetes version, and enabling RBAC for security purposes.

- We **export the kubeconfig**, which is needed to interact with the Kubernetes API server. With the kubeconfig, we can use `kubectl` to deploy apps or configure the cluster.

- We set up a **Kubernetes provider** instance with Pulumi, giving it kubeconfig we obtained from the AKS cluster. This provider will be used for all subsequent Kubernetes resource deployments.

- We use the `k8s.helm.v3.Chart` class to deploy the **prometheus-mixin Helm chart**. You'll need to specify the correct Helm chart version and the repository URL where the chart is located.

The program assumes you have already set up your Azure credentials for use with Pulumi. If you need help setting up your Azure credentials, the [Azure setup](https://www.pulumi.com/docs/get-started/azure/configure/) guide covers this topic.

Please make sure you replace `your_prometheus_mixin_version` and the repository URL with appropriate values. The version should correspond to the version of the Helm chart you wish to deploy, and the repository URL should point to the Helm repository that contains the Prometheus-mixin chart.

After running this Pulumi program, your AKS cluster will be ready, and the Prometheus-mixin Helm chart will be deployed. You can check the status of the deployment by running `pulumi up` and observing the outputs provided by Pulumi.