Conceptual Foundations of EC2

Amazon Elastic Compute Cloud (EC2) is a service that provides resizable compute capacity in the cloud. At its core, EC2 allows you to provision virtual servers — called instances — on demand.

Architecturally, EC2 represents the shift from hardware-centric thinking to software-defined infrastructure. Instead of purchasing physical servers, you request compute capacity via an API.

An EC2 instance consists of:

• Virtual CPU (vCPU)
• Memory (RAM)
• Networking
• Attached storage (typically EBS volumes)
• An operating system (Linux or Windows)

Under the hood, EC2 runs on AWS-managed physical infrastructure, abstracted by a hypervisor. You do not manage the hardware; you manage the virtual machine.

How EC2 works at a high level:

1. You choose an Amazon Machine Image (AMI).
2. You select an instance type.
3. You define networking (VPC, subnet).
4. You attach storage.
5. You configure security (security groups, key pairs).
6. AWS provisions a virtual machine for you.

Why this matters architecturally:

• Compute becomes elastic.
• Capacity planning becomes dynamic.
• Infrastructure becomes programmable.
• You can treat servers as disposable.

In modern system design, EC2 instances should not be viewed as pets (long-lived handcrafted machines), but as cattle (replaceable units managed through automation).

Production insight:

In real systems, manual instance creation is rare. Infrastructure is typically defined using Infrastructure as Code (IaC) tools such as CloudFormation or Terraform. Manual provisioning is mostly for experimentation or debugging.

Understanding EC2 Basics

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What is an EC2 instance?

A physical serverA virtual machine in AWSA storage bucketA database engine

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What EC2 is and what problem it solvesHow virtualization enables cloud computeWhy EC2 instances should be disposableHow EC2 fits into modern infrastructure design