Building a Reusable VPC, Subnets, and Firewall Rules Module

In the previous Terraform labs, I created Google Cloud resources directly from the root configuration. That worked, but the structure was still quite simple. Every resource was defined directly inside the main Terraform configuration. For a small lab, that is fine. But as the infrastructure grows, putting everything in one root configuration can become harder to maintain. So in this lab, I started learning Terraform modules. The goal is to turn the previous VPC and subnet configuration into a re