Output declaration syntax in Terraform - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Configuration

intermediate

Identify the correct output declaration syntax

Which Terraform output declaration will correctly output the value of the variable instance_id?

A output "instance_id" = var.instance_id

B output "instance_id" { value = var.instance_id }

C output instance_id = var.instance_id

D output { instance_id = var.instance_id }

💡 Hint

Terraform output blocks require a name in quotes and a value attribute inside curly braces.

Terraform output declarations must use the syntax: output "name" { value = expression }. Options B, C, and D do not follow this syntax and will cause errors.

❓ service_behavior

intermediate

What is the output value type?

Given the following Terraform output declaration, what is the type of the output value?

Terraform

output "server_ips" {
  value = ["10.0.0.1", "10.0.0.2"]
}

A A list of strings

B A map of strings

C A single string

D A boolean

💡 Hint

Look at the square brackets and the values inside.

The value is a list (array) containing two string elements, so the output type is a list of strings.

❓ Architecture

advanced

Which output declaration correctly exports a nested attribute?

You have a resource aws_instance.web with an attribute public_ip. Which output declaration correctly exports this attribute?

A output "web_ip" { value = aws_instance.web.public_ip }

B output "web_ip" { value = aws_instance["web"].public_ip }

C output "web_ip" { value = aws_instance.web["public_ip"] }

D output "web_ip" { value = aws_instance.web.public_ip_address }

💡 Hint

Use dot notation to access resource attributes.

The correct syntax to access the public_ip attribute of the aws_instance resource named web is aws_instance.web.public_ip. Options A and C use invalid indexing syntax, and D uses a wrong attribute name.

❓ security

advanced

Which output declaration exposes sensitive data correctly?

You want to output a database password stored in var.db_password but keep it hidden in Terraform output. Which declaration is correct?

A output "db_password" { value = var.db_password hidden = true }

B output "db_password" { value = var.db_password sensitive = false }

C output "db_password" { value = var.db_password }

D output "db_password" { value = var.db_password sensitive = true }

💡 Hint

Terraform supports a sensitive flag in output blocks.

To mark an output as sensitive and hide its value in CLI output, use the sensitive = true attribute. Options A and B do not hide the value, and D uses an invalid attribute.

✅ Best Practice

expert

What is the effect of missing the output block's value attribute?

Consider this Terraform output declaration:

output "region" {}

What happens when you run terraform apply?

A Terraform outputs null for region

B Terraform outputs an empty string for region

C Terraform raises a validation error about missing value attribute

D Terraform ignores the output block silently

💡 Hint

Output blocks require a value attribute to be valid.

Terraform requires the value attribute in output blocks. Omitting it causes a validation error during plan or apply.