Terraform and YAML: Advanced Patterns for Enterprise-Scale Infrastructure

A technical article series on using Terraform with YAML for infrastructure-as-code has reached its third and final installment, focusing on enterprise-level patterns. The piece explains the limitations of Terraform's native shallow merge function, which only combines top-level keys and can cause nested configuration data to be lost. To address this, the article introduces deep merge strategies that allow more specific environment configurations to override generic global settings without discarding shared values. It also covers organizing multiple YAML files across different scopes such as global, environment, service, and region layers. Additionally, the article outlines how these configuration patterns can be integrated into CI/CD pipelines to automate infrastructure deployment workflows.