Quick answer
Infrastructure as code (IaC) is the practice of defining servers, networks, and cloud resources in version-controlled configuration files, rather than manually configuring them through a cloud console. Running that configuration automatically provisions or updates real infrastructure. Terraform is the most widely used tool because it works across multiple cloud providers, and IaC is now a standard expectation in most cloud and DevOps job postings.
If you have looked at cloud or DevOps job postings recently, you have likely seen "infrastructure as code" or "Terraform" listed as a required skill, often without much explanation of what it actually means. This guide breaks down the concept in plain terms, why it has become standard practice, and how to start learning it.
Why teams stopped configuring infrastructure by hand
Manually clicking through a cloud console to create servers and networks works for a single project, but breaks down fast at real scale: configurations drift between environments, changes are not tracked or reviewable, and recreating an environment from scratch becomes guesswork. Infrastructure as code solves this by treating infrastructure the same way developers treat application code — versioned, reviewed, and repeatable.
How infrastructure as code actually works
- 1You write a configuration file describing the desired infrastructure — for example, a server with specific settings.
- 2The IaC tool compares that desired state to what currently exists in the cloud.
- 3The tool calculates the changes needed and shows you a plan before applying anything.
- 4Once approved, the tool applies the changes automatically through the cloud provider's API.
- 5The configuration file itself lives in version control, so every change has a clear history.
The main tools, compared
| Tool | Scope | Best for |
|---|---|---|
| Terraform | Multi-cloud (AWS, Azure, GCP, and more) | Teams wanting one consistent tool across providers |
| AWS CloudFormation | AWS only | Teams fully committed to AWS |
| Azure Bicep | Azure only | Teams fully committed to Azure |
| Ansible | Configuration management, some provisioning | Configuring existing servers rather than creating cloud resources |
Infrastructure as code turns "I think that's how the server is configured" into "here is exactly how it is configured, and here is who changed it and when."
How to start learning it
- Get comfortable with one cloud platform (AWS or Azure) and basic command-line usage first.
- Learn Terraform specifically, since it is the most widely requested and transferable across employers.
- Practice on small, low-cost projects — a single server or storage bucket — before attempting complex setups.
- Learn to read a Terraform plan output carefully before applying changes; this habit prevents costly mistakes.
How MITS Edge fits
MITS Edge's cloud computing track includes infrastructure as code as a core module, not an afterthought — hands-on Terraform practice against real cloud accounts, taught live on evening and weekend schedules across US and Canada time zones, with mentorship and project-based learning that mirrors how cloud and DevOps teams actually work.
Learn infrastructure as code alongside core cloud computing skills.
Browse coursesFrequently asked questions
What is infrastructure as code in simple terms?+
Infrastructure as code (IaC) means defining servers, networks, and cloud resources in version-controlled configuration files instead of manually clicking through a cloud console. Running that configuration automatically creates or updates the actual infrastructure.
Do I need to learn infrastructure as code for a cloud engineering job?+
Increasingly yes. Most cloud and DevOps job postings now list infrastructure as code tools, most commonly Terraform, as an expected skill, because manually managed infrastructure does not scale reliably for real teams.
What is the most popular infrastructure as code tool?+
Terraform is the most widely used tool because it works across multiple cloud providers with one consistent syntax. Cloud-specific alternatives include AWS CloudFormation and Azure Bicep, which only work within their respective platforms.
Is infrastructure as code hard to learn?+
The core concepts are approachable for anyone with basic cloud and command-line familiarity. Most learners can write and apply simple Terraform configurations within a few weeks, though real fluency builds over months of hands-on project work.
How does infrastructure as code relate to DevOps?+
It is one of the core practices of DevOps, alongside CI/CD and monitoring. IaC makes infrastructure changes repeatable, reviewable, and automatable, which is central to how modern DevOps teams operate.
Related courses at MITS Edge
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