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Glossary

Infrastructure as Code (IaC): Managing Cloud Resources Through Code

Infrastructure as Code (IaC) defines and provisions cloud resources using declarative or imperative code, enabling version control, repeatability, and automated security scanning of infrastructure.

Akash Mahajan
#infrastructure-as-code #iac #terraform #cloudformation #cloud-security #devops

What is Infrastructure as Code?

Infrastructure as Code (IaC) is the practice of defining, provisioning, and managing cloud infrastructure through machine-readable configuration files rather than manual processes. Instead of clicking through the AWS console to create a VPC, you write a Terraform file that declares the VPC’s configuration, commit it to Git, and apply it through a pipeline.

Major IaC tools include Terraform (multi-cloud), AWS CloudFormation, Azure Resource Manager (ARM/Bicep), Google Cloud Deployment Manager, Pulumi (general-purpose programming languages), and CDK (Cloud Development Kit). Each takes a different approach, but all share the principle: infrastructure configuration lives in version-controlled code.

Why It Matters

IaC transformed cloud operations from artisanal to industrial. Before IaC, infrastructure was configured manually — click-by-click in web consoles. This created snowflake environments where no two deployments were identical, changes were untracked, and reproducing infrastructure was impossible.

For security, IaC creates both opportunities and risks:

Opportunities:

  • Configuration is reviewable — security teams can audit infrastructure before deployment
  • Changes are tracked — Git history shows who changed what and when
  • Environments are reproducible — staging matches production, reducing “works in my account” issues
  • Policy enforcement — automated scanners can check IaC for security violations before apply

Risks:

  • Secrets in state files — Terraform state stores resource attributes in plaintext, including passwords and keys
  • Insecure defaults — Many IaC modules ship with permissive defaults (public access, no encryption)
  • Drift — Manual changes to deployed infrastructure create divergence from the code
  • Overly broad permissions — IaC deployment pipelines often have admin-level access
  • Copy-paste propagation — One insecure module copied across 50 projects multiplies risk

How It Works / Key Concepts

Declarative vs imperative:

  • Declarative (Terraform, CloudFormation) — You describe the desired end state; the tool figures out how to get there
  • Imperative (scripts, Pulumi) — You specify the exact steps to execute

The IaC lifecycle:

  1. Write — Define resources in HCL, YAML, JSON, or a programming language
  2. Plan — Preview what changes will be made (terraform plan)
  3. Review — Security scanning and peer review of the plan
  4. Apply — Execute changes against the cloud provider
  5. State management — Track the current state of deployed resources

Security scanning for IaC:

  • Static analysis — Tools like tfsec, Checkov, and KICS scan IaC files for misconfigurations before deployment
  • Plan-time validation — Evaluate the execution plan against security policies
  • Post-deployment validation — CSPM confirms that deployed state matches secure intent

State file security: Terraform state files deserve special attention. They contain the full configuration of every managed resource, often including database passwords, API keys, and private IPs. State should be stored encrypted in remote backends (S3 + DynamoDB, GCS, Terraform Cloud) with strict access controls — never committed to Git.

Drift detection: When someone modifies infrastructure outside IaC (manual console changes, scripts, another tool), drift occurs. The deployed state no longer matches the code. Security-relevant drift — like a security group rule added manually — can introduce vulnerabilities that do not appear in code review.

How Kloudle Helps

Kloudle scans your deployed cloud infrastructure — the actual running state — regardless of how it was provisioned. This catches security issues whether they originated in IaC code, manual changes, or drift from the declared configuration. With 1,890+ checks across AWS, GCP, Azure, DigitalOcean, and Kubernetes, Kloudle validates that your live infrastructure is secure at $5K/year fixed pricing — no per-resource billing that penalizes IaC-heavy environments.

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