terraform

Organize Terraform projects by separating reusable modules from root configurations. Store remote state in a backend with locking enabled to prevent concurrent modifications. Use a standard directory layout: modules/ for reusable components, main.tf for root configuration, and backend configuration for state management across teams.

Yes. Terraform automates AWS provisioning across VPCs, subnets, and instances using provider configuration and modular design. Define VPC and subnet resources in modules, reference them in root configurations with variables, and apply the standard workflow (init, plan, apply) to deploy across regions or accounts.

Use typed input variables with validation rules to enforce correctness before provisioning. Define variable types (string, number, list, map, object) in modules, set defaults and descriptions, and use validation blocks to catch configuration errors early. This prevents invalid infrastructure deployments.

Build reusable VPC modules and other infrastructure components once, then consume them in multiple root modules by referencing the module source and passing required variables. This pattern reduces duplication, improves consistency, and simplifies updates across projects.

The standard workflow is: init (set up backend and download providers), fmt (format code), validate (check syntax), plan (preview changes), apply (deploy infrastructure), and destroy (tear down resources). This sequence ensures safe, predictable infrastructure provisioning and modifications.

Yes. Terraform data sources query existing AWS infrastructure without managing it. Use data sources to reference VPCs, subnets, AMIs, or security groups already deployed, then pass those values to modules or resources. This bridges manually created and Terraform-managed infrastructure.