Added configs

services-in-kubernetes/02/demos.md

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+
+### **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
+```
+