Deploy the nagios helm chart on AWS EKS

Question

Pulumi · Accepted Answer

To deploy the Nagios Helm chart on an AWS EKS cluster, we'll take the following steps:

1. **Create an EKS Cluster**: We'll define an EKS cluster using Pulumi's EKS package, which simplifies creating and managing an EKS cluster on AWS.
2. **Deploy the Nagios Helm Chart**: Once the EKS cluster is up and running, we'll use Pulumi's Kubernetes package to deploy the Nagios Helm chart to the cluster.

Let's go through the process step-by-step:

### Step 1: Create an EKS Cluster
First, we will need to set up an EKS cluster where we will deploy Nagios.

Here's how you define an EKS cluster with Pulumi's `eks.Cluster` resource:

```typescript
import * as eks from "@pulumi/eks";

// Create an EKS cluster with the default configuration.
const cluster = new eks.Cluster("my-cluster", {});
```

### Step 2: Deploy the Nagios Helm Chart
With the cluster ready, we use the `helm.v3.Chart` resource to deploy Nagios from its Helm chart:

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

// Deploy the Nagios Helm chart.
const nagiosChart = new k8s.helm.v3.Chart("nagios", {
    chart: "nagios",
    version: "<version>", // Specify the version of the Nagios Helm chart you wish to deploy
    fetchOpts: {
        repo: "https://helm-repository-of-nagios" // Put the URL of the Nagios Helm repository here
    },
    // Specify any custom values
    values: {
        // Custom values for the Nagios Helm chart
    }
}, { provider: cluster.provider });
```

Below is the full Pulumi TypeScript program. This program creates an EKS cluster and deploys Nagios to it using its Helm chart.

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";
import * as eks from "@pulumi/eks";
import * as k8s from "@pulumi/kubernetes";

// Create an EKS cluster
const cluster = new eks.Cluster("my-cluster", {
    instanceType: "t2.medium", // Specify the desired instance type
    desiredCapacity: 2,        // Specify the desired number of worker nodes
    minSize: 1,                // Minimum number of worker nodes
    maxSize: 3,                // Maximum number of worker nodes
    deployDashboard: false     // EKS dashboard is not recommended to be deployed for security reasons
});

// Export the cluster's kubeconfig
export const kubeconfig = cluster.kubeconfig.apply(JSON.stringify);

// Deploy Nagios using the Helm chart
const nagiosChart = new k8s.helm.v3.Chart("nagios", {
    chart: "nagios",
    version: "4.4.5", // Specify the version of the Nagios Helm chart
    fetchOpts: {
        repo: "https://nagios-stable.github.io/helm-charts" // Replace with the Nagios Helm chart repository
    },
    // Specify any custom values for the Helm chart
    values: {
        // ...
    }
}, { provider: cluster.provider });

// Note: Please replace the chart version and repository URL with the actual ones.
```

This program will create an EKS cluster and deploy Nagios on it. Here is what each piece is doing:

- `eks.Cluster`: This resource creates a managed Kubernetes cluster on AWS EKS. You can specify the details for your cluster, including instance types, the desired number of nodes, and whether to deploy the dashboard.
- `k8s.helm.v3.Chart`: This is used to deploy Helm charts on the Kubernetes cluster. In this case, we're deploying the Nagios Helm chart, which we need to make sure is available in a Helm repository.
- `kubeconfig`: This export provides the kubeconfig needed to connect to your newly created EKS cluster, which you can use with `kubectl` or other Kubernetes tools.

### Important Points:

- **Helm Version**: Replace the `version` placeholder with the actual Helm chart version you want to deploy.
- **Helm Repository**: Make sure you provide the correct repository URL for the Nagios Helm chart.

Once you've defined the program as shown above, you can run it with Pulumi CLI commands `pulumi up` to create the resources on AWS. After you've run `pulumi up` and the resources are created, you'll have a functioning EKS cluster with Nagios deployed. If you wish to access the Nagios interface, you would typically expose it via a Kubernetes Service of type `LoadBalancer`, NodePort, or set up Ingress, depending on how you wish to access it.

Remember, this is only a starting point and the specific configuration for the Helm chart will depend on your requirements for Nagios, such as storage, plugins, and monitoring configurations. Be sure to look at the documentation for the Nagios Helm chart for all the configuration options.