This article details a technical migration strategy for moving a small business's legacy WordPress site from an on-premises RHEL 7 server to a modern, secure, and scalable cloud environment on Amazon Web Services (AWS), leveraging Ubuntu 22.04 LTS. Our approach uses Terraform for Infrastructure-as-Code (IaC) provisioning and Ansible for configuration management, ensuring repeatability, minimal downtime, and adherence to security best practices.

Phase 1: Infrastructure Provisioning with Terraform (IaC)
The first crucial step is defining and provisioning the new AWS infrastructure. We're moving from a monolithic on-prem server to a cloud-native architecture.

1. Defining the AWS Stack

We use Terraform to provision a secure foundational environment. The key components include:

Virtual Private Cloud (VPC): A dedicated virtual network for isolation.

Subnets: Public subnets for the EC2 instance and internal subnets (optional, but recommended for a future RDS database).

Security Groups (SGs): Acting as a virtual firewall, strictly controlling inbound and outbound traffic.

EC2 Instance: The virtual machine running Ubuntu 22.04 LTS (Jammy Jellyfish).

AWS Key Pair: For initial SSH access (though we'll lock this down later).

2. Terraform Code Snippet: EC2 and Security Group

The following main.tf snippet demonstrates provisioning a secure EC2 instance and a minimal Security Group. Note the use of a data block to dynamically fetch the latest Ubuntu 22.04 AMI ID.

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