terraform fmt and validate

terraform fmt and validate

This lesson deepens Terraform Fundamentals using the same subject areas emphasized by official documentation: Terraform official docs: HCL, providers, resources, variables, outputs, state, modules, plan/apply and import. The goal is to turn terraform fmt and validate into a production skill: you should know the concept, the configuration surface, the safety controls, the operational checks, and the rollback path.

Documentation Coverage

• Core terms and object model for this topic.
• Configuration options, defaults, and lifecycle behavior from the docs.
• Security, reliability, and ownership boundaries.
• Validation steps before and after the change.
• Common failure modes and diagnostic signals.

Production Implementation Flow

1. Define the source of truth: Git, configuration, API, state file, or control plane.
2. Design the safest repeatable workflow, including dry-run or plan output where possible.
3. Attach CI/CD, policy, security, and peer-review gates.
4. Observe metrics, logs, events, or traces after the change.
5. Document rollback, escalation owner, and evidence for the change record.

terraform fmt -check -recursive
terraform init -backend-config=env/prod.backend.hcl
terraform validate
terraform plan -out=tfplan
terraform show -json tfplan > tfplan.json

Mastery Standard

You understand terraform fmt and validate when you can explain it, configure it, test it, monitor it, and recover it under incident pressure without relying on undocumented manual steps.