What is infrastructure as code (IaC)?
Infrastructure as code (IaC) is the practice of defining your servers, networks, databases, and other cloud resources in text files, then letting a tool create and update them for you. Instead of clicking through a cloud console by hand, you write a description of what you want, store it in version control, and apply it. Popular tools include Terraform, Pulumi, and AWS CloudFormation.
In plain words
Think of it like a recipe instead of cooking from memory. Anyone can follow the recipe and get the same dish every time. With IaC, the recipe is your infrastructure: run it once or a hundred times and you get the same environment, with no forgotten steps.
Why it matters
- Repeatable environments. You can spin up an identical staging or production setup from the same files, so "it works on my machine" stops being an excuse.
- Review and history. Changes go through pull requests like any other code. You can see who changed what and roll back when something breaks.
- Faster recovery. If a region goes down, you rebuild from the files instead of remembering which buttons you clicked last year.
- Fewer manual mistakes. Humans forget a checkbox. A defined file does not.
Common pitfalls
- State drift. Someone edits a resource by hand in the console, and now reality no longer matches your files. Decide early that the code is the single source of truth.
- Hardcoded secrets. Passwords and keys do not belong in your IaC files. Use a secrets manager and reference it.
- Huge, monolithic configs. One giant file becomes impossible to review. Split it into modules with clear boundaries.
Related articles:
- What is DevOps? - The culture and practices IaC fits into.
- What is GitOps? - Using Git as the source of truth for deployments.
- What is a CI/CD pipeline? - How automated pipelines apply your infrastructure changes.
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