Terraform Technical Reference

This section collects practical Terraform references from infrastructure-as-code fundamentals through state, modules, maintenance, and HCP Terraform. The material is organized by technical relationship rather than as a certification curriculum.

Start with Terraform and infrastructure as code for the declarative workflow, then use the sections below when you need a specific implementation distinction.

In this section

• Terraform Infrastructure as Code
  Reference entries explaining Terraform’s declarative infrastructure-as-code model and multi-provider workflow.
  • Terraform and Infrastructure as Code
    How HashiCorp Terraform uses declarative configuration, plans, and state to manage infrastructure as code.
  • Terraform Multi-Provider Workflows
    How Terraform uses providers to manage multiple cloud, SaaS, and on-premises platforms through one declarative workflow.
• Terraform Fundamentals
  Reference entries on Terraform provider requirements, provider configurations, aliases, and state.
  • Terraform Provider Requirements and Lock Files
    How Terraform declares provider source addresses and version constraints, and records selected provider packages in its dependency lock file.
  • Terraform Provider Aliases and State
    How Terraform uses provider aliases for multiple configurations and state to map configuration addresses to remote objects.
• Terraform Workflow
  Reference entries covering Terraform working-directory preparation, plans, applies, and resource dependencies.
  • Terraform Init, Format, and Validate
    The distinct roles of terraform init, terraform fmt, and terraform validate in a Terraform configuration workflow.
  • Terraform Plans, Applies, and Destroys
    How Terraform previews changes with plans, performs approved changes with apply, and removes managed resources with destroy.
  • Terraform Resource Dependencies
    How Terraform infers resource dependencies from expressions and when an explicit depends_on relationship is appropriate.
• Terraform Configuration
  Reference entries on Terraform resources, data sources, module values, expressions, validation, lifecycle, and sensitive data.
  • Terraform Resources, Data Sources, and References
    How Terraform manages infrastructure with resource blocks, reads existing information with data sources, and connects values with references.
  • Terraform Variables, Outputs, and Types
    How Terraform modules accept typed inputs, reuse local values, and expose selected results through outputs.
  • Terraform Expressions and Dynamic Blocks
    How Terraform expressions compute values and when dynamic blocks help generate repeated nested configuration.
  • Terraform Validation, Lifecycle, and Sensitive Data
    How Terraform validates inputs, controls replacement lifecycle, and limits exposure of sensitive or temporary values.
• Terraform Modules
  Reference entries on Terraform module sources, reusable interfaces, and controlled module version upgrades.
  • Terraform Module Sources and Interfaces
    How Terraform modules package reusable configuration and expose a stable interface through inputs and outputs.
  • Terraform Module Versions
    How Terraform callers constrain registry module versions and review module upgrades independently of provider lock files.
• Terraform State Management
  Reference entries on Terraform state, backends, remote locking, drift detection, refresh-only reconciliation, and refactoring.
  • Terraform State and Backends
    What Terraform state records, how a backend stores it, and why state storage needs security and collaboration controls.
  • Terraform Remote State and Locking
    How a Terraform remote backend supports shared state, and why locking must be verified for the selected backend.
  • Terraform Drift and State Refactoring
    How Terraform detects out-of-band infrastructure drift and preserves resource identity during configuration refactors.
• Terraform Maintenance
  Reference entries on adopting existing infrastructure, inspecting Terraform state, and diagnosing Terraform operations.
  • Terraform Import and State Inspection
    How Terraform adopts an existing remote object into state and how to inspect recorded resource addresses safely.
  • Terraform Troubleshooting and Logging
    A layered approach to Terraform troubleshooting, including plan review, state inspection, provider errors, and diagnostic logging.
• HCP Terraform
  Reference entries on HCP Terraform workspaces, remote operations, governance, dynamic credentials, projects, and variable sets.
  • HCP Terraform Workspaces and Remote Operations
    How HCP Terraform workspaces organize a collection of infrastructure and run Terraform remotely in a shared execution environment.
  • HCP Terraform Governance and Policy
    How HCP Terraform applies access controls, policy checks, and dynamic provider credentials around shared infrastructure runs.
  • HCP Terraform Projects, Variable Sets, and Run Triggers
    How HCP Terraform groups workspaces into projects, shares scoped variables, and coordinates dependent workspace runs.
• Terraform Workflow and State Quick Reference
  A compact reference to Terraform workflow stages, state boundaries, providers, backends, modules, and HCP Terraform.
• Terraform Documentation
  Primary HashiCorp documentation for Terraform language, state, modules, providers, and HCP Terraform.
• Terraform Glossary
  Short definitions for Terraform workflow, configuration, state, module, and HCP Terraform terms.