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What Is Infrastructure as Code (IaC)?

Infrastructure as Code (IaC)

Definition

Infrastructure as Code (IaC) is the practice of managing and provisioning computing infrastructure through machine-readable definition files rather than manual configuration or interactive tools. Infrastructure -- servers, networks, databases, load balancers, security groups -- is described in code, version-controlled in Git, and deployed through automated pipelines.

Popular IaC tools include HashiCorp Terraform (multi-cloud), AWS CloudFormation, Azure Bicep, Pulumi, and Google Cloud Deployment Manager.

Why It Matters

Manual infrastructure management does not scale. When infrastructure is configured through console clicks and SSH sessions, the result is snowflake environments: no two servers are exactly alike, changes are not tracked, and reproducing an environment requires tribal knowledge that lives in one engineer's head.

IaC makes infrastructure reproducible, auditable, and testable. Every change is a code commit with a pull request, a review, and a history. Environments can be destroyed and recreated identically. Drift detection identifies when actual state diverges from declared state. Disaster recovery becomes "run the pipeline" instead of "read the runbook and hope it is current."

For regulated industries, IaC provides the change management audit trail that compliance frameworks (SOC 2, HIPAA, FedRAMP) require. Every infrastructure change has a who, what, when, and why recorded in version control.

Key Principles

  • Declarative over imperative -- Describe what you want, not how to build it. The tool determines the execution plan.
  • Version controlled -- All infrastructure code lives in Git with full history
  • Modular -- Reusable modules for common patterns (VPC, database, Kubernetes cluster)
  • Tested -- Infrastructure changes validated through plan/preview before apply
  • Immutable -- Servers are replaced, not modified in place

How BAG Uses It

Every infrastructure component we manage is defined in Terraform. Cloud landing zones, Kubernetes clusters, networking, security groups, and monitoring -- all version-controlled and deployed through CI/CD pipelines. We design modular IaC libraries for clients that make infrastructure provisioning self-service while maintaining security and compliance guardrails.

Related Terms

DevOps | CI/CD | Cloud-Native | Kubernetes