A company is running its solution on AWS in a manually created VPC. The company is using AWS Cloud Formation to provision other parts of the infrastructure. According to a new requirement, the…

Using AWS CDK, while powerful, involves writing code in a programming language and synthesizing templates, which is generally more effort than directly writing a CloudFormation template for an existing VPC.

CloudFormation Stack Sets are designed for deploying resources across multiple AWS accounts or regions, which is an unnecessary complexity and effort for managing a single VPC in one account.

This choice is incomplete, but if it implies re-provisioning/recreating the VPC, it would likely be more disruptive and potentially more effort than simply defining the existing VPC's state in a template for management.

Creating a new CloudFormation template that defines the VPC's configuration is the most direct and least effort approach to bring an existing, manually created VPC under CloudFormation management, allowing for automated provisioning and updates.