Infrastructure as Code: A Practical Starting Point

Why version-controlled infrastructure

Infrastructure that exists only as a sequence of console actions is difficult to review, impossible to reproduce reliably, and dependent on whoever performed the last change. Describing infrastructure in version-controlled files addresses those problems directly: changes can be reviewed before they happen, environments can be recreated, and the current state of the system is documented by definition.

The goal is not to achieve a perfect description of an entire estate. It is to make the important parts repeatable, then expand coverage deliberately.

Start with one environment

Attempting to codify production, staging, and development simultaneously is the most common reason infrastructure-as-code initiatives stall. A better first step is to pick a single, relatively simple environment — often a new staging environment — and describe it end to end.

That exercise reveals the real structure of the infrastructure, the dependencies between components, and which parts are genuinely static versus which change often. Those are the decisions that matter, and they are cheaper to make on one environment than three.

What to codify first

The first candidates are usually the resources that are created once and rarely changed: networks, subnets, security groups, storage, databases, and identity configuration. They carry the most risk if they are rebuilt incorrectly, and they change least often, so the code stays stable.

Application deployment is a separate concern and can follow. Some infrastructure benefits from being provisioned by code while releases are handled by a deployment pipeline; mixing the two too early tends to complicate both.

What not to do

Two mistakes are worth avoiding explicitly. The first is adopting a large framework without understanding the resources it manages; the abstraction is useful only when the underlying model is understood. The second is codifying everything at once, including resources that are still changing weekly.

Infrastructure as code is a practice, not a migration. It works best when it expands as the team gains confidence, and when each environment it describes is genuinely reproducible.