Terraform and YAML: Using Modules and Dynamic Config for Scalable IaC

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A technical tutorial series on DEV Community explores intermediate techniques for managing infrastructure as code using Terraform and YAML. The second article in the series focuses on combining YAML configuration files with Terraform's modularization features to reduce code duplication and improve scalability. Key topics covered include passing YAML-loaded data into reusable Terraform modules, using the for_each meta-argument for dynamic resource provisioning, and applying functions like lookup alongside conditionals to handle optional configuration values. The article provides a practical directory structure and code examples built around a sample AWS EC2 web server module. This approach aims to help engineers build more maintainable and environment-aware infrastructure projects.

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