Terraform CLI Variable Overrides: Precedence, Identity, and Evaluation Timing
Автор: Fierem
Загружено: 2026-02-04
Просмотров: 10
Описание:
This lesson explains how Terraform resolves variable values by precedence, focusing on when and why one value overrides another rather than how values are supplied. The emphasis is on Terraform’s evaluation model: stable identity, late-binding values, and the quiet risks that come with high-authority overrides.
You will learn how CLI variable overrides fit into Terraform’s layered resolution system, why they do not change the dependency graph, and how they affect meaning without altering structure.
What this lesson covers:
How Terraform treats variables as identity requirements, not instructions
The correct precedence order for environment variables, defaults, variable files, and CLI overrides
Why CLI overrides substitute values without rewiring the dependency graph
How late-binding values change meaning while preserving structure
The silent risk of powerful overrides that leave no record of intent
Risk discussed:
CLI overrides can produce significantly different outcomes without triggering warnings, because Terraform’s structure and graph remain unchanged.
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