External Load Balancer and Auto Scaling

Web Tier AMI

1. Navigate to Instances on the left-hand side of the EC2 dashboard.
2. Select the web tier instance we created.
3. Under Actions, select Image and templates.
4. Click Create Image.

1. Give the image a name and description, then click Create image.
2. To monitor the status of the image creation:
   • Click AMIs under Images on the left-hand navigation panel of the EC2 dashboard.

Target Group

While the AMI is being created, we can create a target group for our load balancer.

1. Navigate to Target Groups under Load Balancing on the left-hand side.
2. Click on Create Target Group.

1. Select Instances as the target type.
2. Give it a name.
3. Set the protocol to HTTP and port to 80.
4. Select the VPC we’ve been using.
5. Change the health check path to /health.
6. Click Next.
7. Skip target registration and create the target group.

Internet-Facing Load Balancer

1. Navigate to Load Balancers under Load Balancing.
2. Click Create Load Balancer.
3. Choose Application Load Balancer.

1. Give the load balancer a name.
2. Select Internet-facing.
3. Choose the correct VPC and public subnets.
4. Select the security group created for this ALB.
5. Set HTTP traffic on port 80.
6. Forward traffic to the target group created earlier.
7. Click Create Load Balancer.

Launch Template

Before configuring Auto Scaling, create a Launch Template with the AMI created earlier.

1. Navigate to Launch Template under Instances.
2. Click Create Launch Template.

1. Name the Launch Template.
2. Under Application and OS Images, select the app tier AMI created earlier.
3. Choose Instance Type as t2.micro.
4. Do not include a Key pair and Network Settings.
5. Set the correct security group for the web tier.
6. Under Advanced details, use the same IAM instance profile used for EC2 instances.
7. Click Create Launch Template.

Auto Scaling

1. Navigate to Auto Scaling Groups under Auto Scaling.
2. Click Create Auto Scaling Group.
3. Give it a name.
4. Select the Launch Template created earlier.
5. Click Next.

1. Set VPC and public subnets for the web tier.
2. Attach the Auto Scaling Group to the Load Balancer’s target group.
3. Set desired, minimum, and maximum capacity to 2.
4. Click Skip to review, then Create Auto Scaling Group.

Web Application Deployment

After completing these steps, our WebApp is fully set up and ready to handle traffic efficiently!