Terraform: Up & Running (3rd edition)

Why it stuck

I'd used Terraform for a year before reading this and had already made the two classic mistakes: local state and one giant root module. Brikman explains why those hurt and what the alternatives cost.

Applied

• The directory-per-environment layout, versioned modules and S3 + DynamoDB state in infra-ops: one Terraform + Ansible platform for dev, staging and prod are straight from chapters 3 and 4.
• The testing chapter convinced me to run terraform plan on every PR and post it as a comment; that one habit catches most mistakes.
• The book's "Terraform is for provisioning, use something else for configuration" stance is the argument in Infrastructure as Code: Bridging Terraform and Ansible.

Reservations

The 3rd edition predates some newer testing-framework features and the OpenTofu fork, so treat the tooling chapters as direction rather than exact commands.