Terraform and Bicep: Infrastructure as Code for the Cloud

A practical guide to Infrastructure as Code (IaC) using Terraform and Bicep — the two dominant tools for defining, provisioning, and managing cloud resources declaratively, covering core concepts, state management, modules, and how to choose between them.

Table of Contents

1. Introduction
2. Why Infrastructure as Code
3. Bicep
4. Terraform
5. State Management
6. Modules and Reusability
7. Multi-Environment Patterns
8. CI/CD Integration
9. Terraform vs. Bicep
10. Common Pitfalls
11. Quick Reference Table
12. Conclusion

Introduction

Infrastructure as Code means defining cloud resources — virtual machines, databases, networks, container clusters — in text files that a tool can read and use to create, update, or destroy real infrastructure, rather than clicking through a cloud portal or running one-off CLI commands. The file becomes the source of truth: it’s version-controlled, reviewable in a pull request, and reproducible across environments.

Bicep is Microsoft’s domain-specific language for deploying Azure resources — a cleaner syntax layered directly on top of Azure Resource Manager (ARM) templates. Terraform, from HashiCorp, is cloud-agnostic — the same…