Module outputs in Terraform - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a module output in Terraform?

A module output is a way to expose values from a Terraform module so that they can be used by the root module or other modules. It acts like a window to see important information from inside the module.

beginner

How do you define an output in a Terraform module?

You define an output using the output block with a name and a value. For example:<br>

output "instance_ip" {<br>  value = aws_instance.example.public_ip<br>}

beginner

Why should you use outputs in Terraform modules?

Outputs help share important information like IP addresses, IDs, or URLs from a module to other parts of your configuration or to users. This makes your infrastructure easier to connect and manage.

beginner

How do you access a module output in the root module?

You access it using the syntax module.<module_name>.<output_name>. For example, if your module is called webserver and output is instance_ip, you use module.webserver.instance_ip.

intermediate

Can module outputs be sensitive? How do you mark them?

Yes, outputs can be marked as sensitive by adding sensitive = true inside the output block. This hides the value from Terraform's normal output to protect secrets.

What is the purpose of an output block in a Terraform module?

A To expose values from the module for use elsewhere

B To define variables inside the module

C To create resources in the module

D To delete resources after deployment

Outputs expose values from a module so other parts of the configuration can use them.

How do you reference an output named 'db_password' from a module called 'database'?

A var.database.db_password

B module.database.db_password

C output.database.db_password

D resource.database.db_password

Module outputs are accessed with module.. syntax.

Which keyword marks an output as sensitive in Terraform?

A sensitive = true

B hidden = true

C private = true

D secret = true

The 'sensitive = true' flag hides output values from normal display.

What happens if you do not define outputs in a module?

A Outputs are automatically created

B Terraform will throw an error

C You cannot access any values from the module externally

D The module will not create resources

Without outputs, values inside a module are not accessible outside it.

Which of the following is a valid output block in Terraform?

A output name = var.name

B output name { value = var.name }

C output "name" = var.name

D output "name" { value = var.name }

The correct syntax uses output "name" { value = ... } with quotes and braces.

Explain how Terraform module outputs help in connecting different parts of infrastructure.

Think about how you share important info from one part to another.

Describe how to define and use a sensitive output in a Terraform module.

Consider how to hide passwords or keys in outputs.