Infrastructure as Code (IaC)

13 October 20262 min read

Infrastructure as Code (IaC) is a modern approach to provisioning, configuring, and managing infrastructure through machine-readable definition files rather than manual processes. By treating infrastructure the same way developers treat application code, IaC brings reliability, scalability, and automation to operations.

IaC enables teams to:

• Version-control infrastructure.

• Automate environment creation and teardown.

• Improve consistency and reduce configuration drift.

• Deliver infrastructure rapidly and repeatedly.

• Support DevOps and GitOps workflows.

Declarative vs. Imperative Approaches

• Declarative: Define what the final state should be (e.g., Terraform, OpenTofu, Nix).

• Imperative: Define how to reach that state step-by-step (e.g., Ansible, scripts).

Idempotency

IaC tools ensure repeated operations result in the same desired state without side effects.

Version Control Integration

IaC definitions are stored in Git, enabling reviews, rollbacks, and auditability.

GitOps

GitOps extends IaC by making Git the source of truth for the desired runtime state of infrastructure or applications. Automation then applies or reconciles environments to match the state declared in the repository.

Automation & CI/CD Integration

Infrastructure changes can be validated, tested, and applied through pipelines.

Tools

• Terraform / OpenTofu: IaC deployment for multiple services using providers and their API.

• Nix: declarative builds and system configuration.

• Ansible: machine configuration and automation.

• Kubernetes manifests can be considered IaC.