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Ec2 instance pool

As explained in Amazon Web Services in Action, Third Edition: An in-depth guide to AWS

An EC2 instance pool is a collection of EC2 instances that jointly serve an application workload.

An EC2 instance pool is a collection of EC2 instances that jointly serve an application workload. A load balancer provides one entry point and forwards HTTP(S) requests across the instances. section 17.3.1

A scalable web-application pool commonly combines:

Scalable WordPress deployment

A corporate blog uses EC2 and Apache for WordPress, RDS MySQL with Multi-AZ deployment, EFS for shared files and uploads, and a load balancer. CloudFormation creates an Auto Scaling group with two to four instances; a load test exercises the endpoint. section 17.3.1

How Amazon Web Services in Action, Third Edition: An in-depth guide to AWS covers it

How deep it goes
Explains pool architecture, launch templates, health checks, capacity bounds, and CPU-based target tracking, but not instance-level application internals.
Examples
Demonstrates a WordPress blog with two-to-four instances, shared EFS files, Multi-AZ RDS, and an ApacheBench load test.
What it assumes
Assumes an EC2-and-RDS WordPress setup and adds EFS, load balancing, Auto Scaling, and CloudWatch-driven capacity changes.
What you can do after
Builds a scalable WordPress deployment with CloudFormation and tests its load-balancer endpoint.
How it connects
Connects load balancing, Auto Scaling, CloudWatch, RDS, EFS, WordPress, and CloudFormation.
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