AWS EKS Tier-3 Architecture with Terraform

This repository contains Terraform scripts to deploy a Tier-3 AWS EKS architecture. Tier-3 architecture typically involves an persentation Tier, logic Tier and Database Tier.

Prerequisites

Ensure you have the following prerequisites installed:

• Terraform
• kubectl
• AWS CLI configured with necessary credentials

Getting Started

1. Clone the repository:

   git clone https://github.com/yourusername/aws-eks-tier3.git
   cd aws-eks-tier3
   

2. Initialize Terraform:

   terraform init

3. Adjust Configuration:

• Modify the variables.tf file to set appropriate values for your AWS environment.

4. Deploy Infrastructure:

       terraform apply

    Confirm the deployment by typing `yes` when prompted.
   

5. Verify Deployment:

   kubectl get nodes
   # update the Kubernetes context
   aws eks update-kubeconfig --name my-eks-cluster --region ap-northeast-1

6. verify access:

   kubectl auth can-i "*" "*"
   kubectl get nodes

7. Verify autoscaler running:

   kubectl get pods -n kube-system
   

8. Check Autoscaler logs

   kubectl logs -f -n kube-system -l app=cluster-autoscaler
   

9. Check load balancer logs

   kubectl logs -f -n kube-system -l app.kubernetes.io/name=aws-load-balancer-controller
   

10. Update Kubeconfig
    Syntax: aws eks update-kubeconfig --region region-code --name your-cluster-name

    aws eks update-kubeconfig --region ap-northeast-1 --name my-eks-cluster
    

11. Create Namespace

    kubectl create ns demo-eks
    
    kubectl config set-context --current --namespace demo-eks

MongoDB Database Setup

To create MongoDB Resources**

```bash
cd Manifests/mongo_v1
kubectl apply -f secrets.yaml
kubectl apply -f deploy.yaml
kubectl apply -f service.yaml
```

Backend API Setup

Create NodeJs API deployment by running the following command:

```bash
kubectl apply -f backend-deployment.yaml
kubectl apply -f backend-service.yaml
```

Frontend setup

Create the Frontend  resource. In the terminal run the following command:

```bash
kubectl apply -f frontend-deployment.yaml
kubectl apply -f frontend-service.yaml
```

Finally create the final load balancer to allow internet traffic:

```bash
kubectl apply -f full_stack_lb.yaml
```

Grafana setup

Verify Services

```bash
kubectl get svc -n prometheus
```

edit the Prometheus-grafana service:

```
kubectl edit svc prometheus-grafana -n prometheus
```

change ‘type: ClusterIP’ to 'LoadBalancer'

Username: admin
Password: prom-operator
Import Dashboard ID: 1860

Exlore more at: https://grafana.com/grafana/dashboards/

Destroy Kubernetes resources and cluster

```
cd ./Manifests
kubectl delete -f -f
```

Remove AWS Resources to stop billing

```
cd terraform
terraform destroy --auto-approve
```