What is infrastructure as code and why does it matter

Short answer

Infrastructure as code (IaC) is the practice of managing infrastructure through machine-readable definition files rather than manual configuration. It enables version control, automated testing, and consistent environments.

Details

Before IaC, system administrators configured servers by hand, leading to snowflake environments that were hard to reproduce. IaC tools like Terraform, AWS CloudFormation, Pulumi, and Ansible turn infrastructure into software. You can code review a VPC change, roll back a bad deployment by reverting a commit, and spin up identical staging and production environments.

IaC fits naturally into CI/CD pipelines. For practical implementation, see How to use Terraform for infrastructure as code. If you are managing infrastructure changes through Git, also explore What is GitOps and how does it work for a pull-based operational model.

Tips

• Store IaC in the same version control system as your application code for traceability.
• Run static analysis and plan outputs in CI before applying changes.
• For secrets, integrate with a secrets manager rather than hard-coding them in IaC definitions.