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

Question

Pulumi · Accepted Answer

To deploy the ElastAlert Helm chart on Azure Kubernetes Service (AKS), you need to follow these steps:

1. Create an Azure Kubernetes Service (AKS) cluster.
2. Configure `kubectl` to connect with the AKS cluster.
3. Add the Helm chart repository that contains ElastAlert.
4. Deploy ElastAlert using the Helm chart.

We will use Pulumi to define this infrastructure as code. Below is a TypeScript program that uses Pulumi to accomplish this:

- First, we create an AKS cluster using the `azure-native.containerservice.ManagedCluster` resource.
- Next, we set up a Kubernetes provider linked to the AKS cluster, which allows Pulumi to interact with the cluster.
- We install ElastAlert using the `kubernetes.helm.v3.Chart` resource, which is a Pulumi resource to interact with Helm charts in a Kubernetes cluster.

Make sure you have Pulumi installed and you are logged in to your Azure account.

Here is your detailed Pulumi TypeScript program:

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

// Create an AKS cluster
const cluster = new azure_native.containerservice.ManagedCluster("aksCluster", {
    // ... specify required properties, for example:
    resourceGroupName: "myResourceGroup",
    agentPoolProfiles: [{
        count: 1,
        vmSize: "Standard_DS2_v2",
        // other properties as needed
    }],
    // ... other necessary properties
});

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

// Create a Kubernetes provider instance that uses our AKS kubeconfig
const k8sProvider = new kubernetes.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Add a Helm chart repository that contains ElastAlert
const elastAlertRepo = "https://helm.elastalert.com";

// Deploy ElastAlert using the Helm chart
const elastAlertChart = new kubernetes.helm.v3.Chart("elastalert", {
    chart: "elastalert",
    version: "1.0.0", // use the specific version you need
    fetchOpts: {
        repo: elastAlertRepo
    },
}, { provider: k8sProvider });

// Export the required information
export const elastAlertServiceIP = elastAlertChart.getResourceProperty("v1/Service", "elastalert-elastalert", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

Here's what each part of the script is doing:

- We're defining a new AKS cluster resource named `aksCluster` that you will need to further configure to match your requirements (e.g., resource group name, node size, number of nodes).
- We extract the `kubeconfig` from the AKS cluster to allow Pulumi to interact with our cluster.
- We create a Pulumi Kubernetes provider that will use the `kubeconfig` from the newly created AKS instance. This provider allows Pulumi to perform actions within the Kubernetes cluster.
- We define a Helm chart resource for ElastAlert, specifying the `elastalert` chart from its Helm repository. You may need to specify the version that you want to deploy.

After running this Pulumi program, the ElastAlert tool will be deployed into your AKS cluster. The last export shows how you can get service information, such as an IP address, once the service is running.

To apply this Pulumi program:

1. Save the code in a file with a `.ts` extension (for TypeScript), for example `index.ts`.
2. Run the command `pulumi up` from the same directory as your `index.ts` file to create the AKS cluster and deploy ElastAlert.
3. Inspect the preview shown by Pulumi and, if everything looks good, confirm the deployment.

Remember that in a real scenario, you will need to ensure that your environment is properly set up with the required Pulumi, Azure, and Kubernetes credentials before running this code.