TF-004 Use Terraform outside the core workflow Practice Question
A team needs to share a Terraform module across multiple projects within their organization. What is the best practice?
⚠ Common exam trap
A common pitfall is confusing state sharing or workspaces with module distribution. State and workspaces are runtime constructs, not code sharing mechanisms, whereas a remote module source allows centralized version control.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a remote module source such as a Git repository.
Using a remote module source such as a Git repository is the best practice because it allows the module to be versioned, centrally maintained, and consumed by multiple projects without duplication. Terraform's module system supports sources like Git, Mercurial, and HTTP URLs, enabling teams to pin specific versions via tags or refs, ensuring consistency across environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a remote module source such as a Git repository.
Why this is correct
Leveraging a remote Git repository as a module source allows teams to centralize module definitions, promoting reusability and consistency across multiple projects. This approach enables robust version control, ensuring that all consuming projects can pin to specific module versions, facilitating controlled updates and preventing unexpected changes. Terraform's `source` attribute directly supports Git URLs, making this a standard and highly effective method for module sharing and management.
- ✗
Copy the module code into each project's directory.
Why it's wrong here
Copying module code directly into each project's directory creates significant technical debt and maintenance overhead. This duplication means that any bug fixes, feature enhancements, or security updates to the module must be manually applied to every single project, leading to inconsistent module versions and increased risk of errors. Such an approach negates the core benefit of modules, which is to encapsulate and reuse infrastructure components efficiently.
- ✗
Use 'terraform state push' to share state.
Why it's wrong here
`terraform state push` is a command used to manually update the remote state backend with a local state file, typically for recovery or specific migration scenarios. Its sole purpose is to manage the state of deployed infrastructure, not to distribute or share the source code of Terraform modules. Modules are HCL code definitions, fundamentally distinct from the `.tfstate` file which records the actual infrastructure resources managed by Terraform.
- ✗
Use workspace variables to store module code.
Why it's wrong here
Terraform variables are designed to accept input values, such as strings, numbers, booleans, or complex types like maps and lists, to parameterize module configurations. They are not capable of storing or executing arbitrary HCL code, which is what a Terraform module fundamentally consists of. Attempting to pass module definitions as a variable would result in a syntax error, as variables are for data inputs, not structural code components.
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