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Infrastructure as Code (IaC) is the practice of defining computing infrastructure in machine-readable files and using automation tools to provision and manage it. Instead of rebuilding networks, servers, storage, and permissions through repeated console actions, a team describes what it needs, versions that definition, and uses a tool to create or update the real resources.
That makes infrastructure changes part of the DevOps workflow: teams can review them, test them, track who changed what, and deliver them through automation. IaC improves consistency and visibility, but it does not make changes risk-free or secure by itself.
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What is infrastructure as code?
AWS defines IaC as provisioning and supporting computing infrastructure through code rather than manual processes and settings. HashiCorp similarly describes managing infrastructure with configuration files instead of a graphical interface. In practical terms, the files record the intended infrastructure; an IaC tool communicates with cloud or service-provider APIs to create, change, or remove resources.
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Declarative and imperative approaches
Declarative IaC describes the desired end state: which resources should exist and how they should be configured. The tool determines the changes needed to reach it. Imperative approaches specify a sequence of steps to perform. Both approaches can automate infrastructure; they differ in how the desired change is expressed and managed.
Why use IaC in DevOps?
DevOps depends on collaboration between the people who build software and the people who operate its environment. IaC makes infrastructure changes visible and reviewable in much the same way as application-code changes, replacing undocumented sequences of manual actions with a maintained record of intent.
- Repeatability: Teams can reuse definitions to create similar development, test, and production environments rather than reconstructing each one by hand.
- Change history and collaboration: Version control records edits over time and lets teammates review, discuss, and approve infrastructure changes.
- Automation: IaC can be connected to CI/CD pipelines to validate and deliver infrastructure changes through a defined process.
- Drift awareness: Drift is the difference between declared configuration and deployed infrastructure. IaC workflows can reveal or correct some drift, but they do not prevent every out-of-band change or guarantee detection in every setup.
- Security review: Configuration can be checked before deployment, although IaC can also reproduce an insecure setting across many resources if nobody catches it.
These benefits improve consistency and accountability; they do not make deployment inherently safe. A poorly reviewed change can still cause an outage or destroy resources.
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How does infrastructure as code work?
The basic cycle is to define the required resources, let the tool compare that definition with the current environment, inspect the proposed changes, and then apply them. Terraform’s documented workflow provides a concrete example:
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- Scope the infrastructure: Identify the resources and relationships the service needs, such as a network, compute, storage, and permissions.
- Author configuration: Write the desired infrastructure in configuration files.
- Initialize: Run
terraform initto initialize the working directory and obtain the required providers. - Inspect a plan: Run
terraform planto review proposed creates, updates, or destroys before execution. - Apply the change: Run
terraform applywhen the proposed changes have been reviewed and are ready to execute.
Terraform uses state to track the resources it manages and determine what changes are needed to match the configuration. A plan is an important checkpoint: it makes consequential actions visible before they take effect, but it does not replace human review or other safeguards.
Protect state and credentials
Infrastructure state can contain sensitive information. Restrict access, store it securely, and establish a deliberate team workflow for collaboration and concurrency. Do not assume it is safe to commit state files or secrets to an ordinary source-code repository. Use controlled credentials and review how secrets are handled by both the configuration and the deployment process.
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What IaC does not guarantee
- It does not guarantee secure infrastructure. Definitions can contain excessive permissions, exposed services, or other unsafe settings. Use configuration review, validation, and policy checks.
- It does not eliminate drift. People or other systems may change resources outside the managed workflow, leaving deployed infrastructure out of sync with its definition.
- It does not make destructive changes harmless. A planned change can still remove or disrupt resources; inspect plans and apply appropriate approvals and safeguards.
Clear resource ownership also matters. Teams need a process for handling exceptions and for bringing any manually changed infrastructure back under managed configuration.
Terraform vs. CloudFormation: how should you choose?
There is no universal winner. AWS lists CloudFormation, AWS SAM, AWS CDK, Terraform, and Pulumi among options for provisioning AWS resources; Microsoft’s Azure IaC overview points to Bicep, Terraform, and Pulumi. Terraform is commonly used across providers and services, while CloudFormation is AWS’s native option. These product descriptions come from their respective vendors, so compare the tools against your own requirements rather than treating vendor claims as neutral rankings.
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| Decision factor | Questions to ask |
|---|---|
| Provider scope | Is the estate mostly on one cloud, or must the workflow cover resources across multiple providers and services? |
| Language and team skills | Will the team work best with a domain-specific configuration language, templates, or a general-purpose programming language? |
| Review and delivery workflow | How are plans or previews produced, reviewed, applied, and recovered from if a change causes a problem? |
| State and governance | Where is state stored, who can access it, and what approval, audit, policy, and concurrency controls are required? |
| Existing operations | Which option fits current cloud, CI/CD, security, and support practices? |
A provider-native service may reduce friction when an environment is centered on one cloud. A multi-provider tool may give a team a consistent workflow across services, but verify support for the specific resources it needs. Product features, licensing, and supported APIs change; check the current official documentation before making a selection.
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Where to start with IaC
- Choose a bounded service or environment. Start with a manageable set of resources and identify who owns them.
- Define the desired state. Record the resources, relationships, and permissions the environment requires.
- Put configuration under version control. Use review and approval practices appropriate to the impact of each change.
- Validate before applying. Inspect plans or previews, run automated checks, and ensure credentials and state are protected.
- Manage exceptions deliberately. Track out-of-band changes and reconcile them with the declared configuration rather than letting the two drift indefinitely.
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