AWS provider Terraform Modules — 10 Questions

Question 1

Which directory structure is considered standard for a Terraform module?

Accepted Answer

A directory containing main.tf, variables.tf, and outputs.tf.. A standard module should contain at least main.tf, variables.tf, and outputs.tf.

Answer

One single file named 'all.tf'.

Answer

A binary executable file that compiles the infrastructure.

Answer

A separate folder for every single resource.

Question 2

What is the primary benefit of using a module registry compared to a local file path for module distribution?

Accepted Answer

It enables version control and easier sharing across the organization.. Registries provide versioning, documentation generation, and centralized discovery for teams.

Answer

It allows you to run Terraform commands faster.

Answer

It removes the need for input variables.

Answer

It automatically converts your code to a higher-level language.

Question 3

When refactoring a large infrastructure configuration, you move a resource into a child module. How do you handle the existing state to prevent Terraform from destroying and recreating the resource?

Accepted Answer

Use the 'terraform state mv' command to move the resource address.. The 'terraform state mv' command is required to map the old address to the new module-relative address.

Answer

Run 'terraform refresh' to automatically detect the move.

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Rename the resource in the configuration to match the old state.

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Delete the state file and run 'terraform apply'.

Question 4

You have a nested module structure. How can you pass a variable from the root module through an intermediate module to a leaf module?

Accepted Answer

You must define the variable in the intermediate module and pass it to the leaf module.. Each intermediate module must define a variable and then pass it down using the 'source' or 'module' call block.

Answer

Define the variable only in the leaf module and refer to root by index.

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You can use the 'global_vars' block in the root.

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The intermediate module automatically inherits all root variables.

Question 5

You are designing a module that should conditionally create resources based on a boolean input. What feature should you use?

Accepted Answer

Use the 'count' meta-argument with a ternary expression.. The 'count' meta-argument is commonly used to toggle resource creation based on a boolean value.

Answer

Define multiple resources and use 'depends_on' to link them.

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Use an 'if' block around the resource definition.

Answer

Use the 'module' meta-argument inside the resource.

Question 6

You need to output a complex object from a child module to be used by the root module. What is the best practice for defining the output?

Accepted Answer

Define an output block in the child module and reference it in the root module using the module prefix.. Using explicit output blocks in the child module makes the data available for access via 'module..'.

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Assign the output to a global variable in the root module.

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Use a data source to read the child module's internal state.

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Write the output to a local file inside the module and read it in the root.

Question 7

Your team requires a custom module to be versioned strictly to prevent breaking changes during deployments. What is the recommended way to reference a module from a private Git repository?

Accepted Answer

Use the 'ref' parameter in the source URL string.. Using the 'version' argument in the source block allows pinning to specific tags or branches, ensuring stability.

Answer

Set the 'version' block inside the module definition.

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Copy the module code locally every time a new version is released.

Answer

Use the 'module_version' argument in the module block.

Question 8

You are building a module that needs to be consumed by multiple teams. How should you structure your module to ensure that the root module can provide values for variable definitions without hardcoding them in the module itself?

Accepted Answer

Define variables in a variables.tf file within the module directory.. Using input variables allows the module to be generic and reusable by accepting values defined in the calling configuration.

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Hardcode the values into the resource blocks directly.

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Use terraform.tfvars files inside the module folder.

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Define all values in a locals.tf file within the module.

Question 9

When should you use the 'for_each' meta-argument within a module?

Accepted Answer

To instantiate multiple copies of a module based on a map or set.. 'for_each' is used to create multiple instances of a module based on a map or set of strings.

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To iterate over a list of variables inside a resource block.

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To replace the 'count' meta-argument when you only need one instance.

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To speed up the execution of the provider.

Question 10

Where do module outputs appear after a 'terraform apply'?

Accepted Answer

In the CLI output and the state file.. Outputs are displayed in the CLI output and stored in the state file.

Answer

In a file named 'outputs.json'.

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They are automatically emailed to the Terraform administrator.

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In the '.terraform/modules' directory.