Infrastructure as Code

Codifying environments for consistency & repeatability

1 min read

Infrastructure as Code

Infrastructure as Code (IaC) defines and provisions infrastructure through declarative or imperative code instead of manual console actions.

Benefits

  • Reproducibility & drift reduction
  • Version control & audit trail
  • Reviewable / testable changes
  • Faster environment cloning

Core Concepts

| Concept | Summary | | ------- | ------- | | Declarative | Describe end state (Terraform, Bicep) | | Imperative | Step by step (scripts, SDK) | | Idempotency | Safe re-apply without side effects | | State | Source of truth for deployed resources | | Modules | Reusable abstractions for patterns |

Lifecycle

  1. Author / update definitions
  2. Plan (preview changes)
  3. Apply (create/update/delete)
  4. Validate (tests / policies)
  5. Monitor & drift detect

Good Practices

  • Minimal manual console edits
  • Separate state backends per environment
  • Explicit versions for providers/modules
  • Tagging strategy (owner, env, cost center)
  • Policy as code (guardrails)

Pitfalls

  • Storing secrets in plain text
  • Over-abstracting early
  • Large unreviewed plans
  • Mixing imperative tweaks with declarative base

Start with a small module (network + compute) and iterate.