
### **Prerequisites**
1. **AWS CLI Installed & Configured** (`aws configure`)
2. **kubectl Installed**
3. **A Running EKS Cluster** (Amazon Elastic Kubernetes Service)
4. **IAM Permissions** to create and manage EKS resources

---

### **Steps to Deploy Kubernetes Deployment to a LoadBalancer in AWS**

#### **Step 1: Create an EKS Cluster (If Not Already Running)**
```sh
aws eks create-cluster \
	--name my-cluster \
	--role-arn arn:aws:iam::123456789012:role/EKSClusterRole \
	--resources-vpc-config subnetIds=subnet-xxxxxxxx,securityGroupIds=sg-xxxxxxxx
```
This step may take some time. You can verify the cluster status:
```sh
aws eks describe-cluster \
	--name my-cluster \
	--query "cluster.status"
```

#### **Step 2: Update `kubectl` to Use the New Cluster**
```sh
aws eks update-kubeconfig --name my-cluster
```
Ensure `kubectl` is using the correct context:
```sh
kubectl config current-context
```

#### **Step 3: Deploy an Application**
Create a simple deployment file (`deployment.yaml`):

```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: nginx
        ports:
        - containerPort: 80
```
Apply the deployment:
```sh
kubectl apply -f deployment.yaml
```

#### **Step 4: Create a LoadBalancer Service**
Create a service file (`service.yaml`):

```yaml
apiVersion: v1
kind: Service
metadata:
  name: my-app-service
spec:
  type: LoadBalancer
  selector:
    app: my-app
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
```
Apply the service:
```sh
kubectl apply -f service.yaml
```

#### **Step 5: Get the LoadBalancer URL**
Once deployed, you can get the external IP using:
```sh
kubectl get svc my-app-service
```
The output will show something like:
```
NAME             TYPE           CLUSTER-IP     EXTERNAL-IP        PORT(S)        AGE
my-app-service  LoadBalancer   10.100.200.1   a1b2c3d4.amazonaws.com 80/TCP   5m
```

---

### **Verifying the Deployment**
Check if the pods are running:
```sh
kubectl get pods
```
Check logs:
```sh
kubectl logs -f <pod-name>
```
Access the application in your browser using the `EXTERNAL-IP`.

---

### **Cleanup**
To delete resources:
```sh
kubectl delete -f deployment.yaml
kubectl delete -f service.yaml
aws eks delete-cluster --name my-cluster
```

