Infrastructure as Code (IaC) treats infrastructure configuration like application code—version controlled, tested, and automated. Here's how to do it well.
Why IaC?
Benefits:
- Reproducible environments
- Version controlled changes
- Automated deployments
- Self-documenting infrastructure
- Disaster recovery
- Consistency across environments
Tools:
- Terraform: Multi-cloud, declarative
- Pulumi: Real programming languages
- CloudFormation: AWS native
- CDK: AWS with TypeScript/Python
Terraform Basics
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Variables and Outputs
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Modular Design
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Environment Separation
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State Management
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CI/CD Integration
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Security Best Practices
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Best Practices
Organization:
✓ Use modules for reusability
✓ Separate environments
✓ Consistent naming conventions
✓ Pin provider versions
State Management:
✓ Remote state with locking
✓ Encrypt state at rest
✓ Separate state per environment
✓ Regular state backups
Security:
✓ No secrets in code
✓ Use IAM roles over keys
✓ Encrypt sensitive outputs
✓ Review plans before apply
Operations:
✓ Always run plan first
✓ Use CI/CD for changes
✓ Tag all resources
✓ Document modules
Conclusion
Infrastructure as Code enables reliable, repeatable infrastructure management. Use modules for reusability, remote state for collaboration, and CI/CD for safe deployments. Treat your infrastructure code with the same care as application code.