Why outputs expose useful information in Terraform - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an output that shows the instance's public IP.

Terraform

output "instance_ip" {
  value = [1]
}

Drag options to blanks, or click blank then click option'

Aaws_instance.example.public_ip

Baws_instance.example.private_ip

Caws_instance.example.id

Daws_instance.example.arn

Attempts:

3 left

💡 Hint

Common Mistakes

Using private_ip instead of public_ip.

Using instance ID or ARN which are not IP addresses.

The output should expose the public IP of the instance, which is accessed via public_ip.

2fill in blank

medium

Complete the code to output the database endpoint after creation.

Terraform

output "db_endpoint" {
  value = [1]
}

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Aaws_db_instance.main.port

Baws_db_instance.main.id

Caws_db_instance.main.address

Daws_db_instance.main.endpoint

Attempts:

3 left

💡 Hint

Common Mistakes

Using the database ID or port instead of the endpoint.

Using an attribute that does not provide connection info.

The endpoint attribute provides the database connection address, which is useful to expose.

3fill in blank

hard

Fix the error in the output block to correctly expose the load balancer DNS name.

Terraform

output "lb_dns" {
  value = aws_lb.example.[1]
}

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Aname

Bhostname

Cdns_name

Durl

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' which is just the resource name.

Using 'hostname' or 'url' which are not valid attributes.

The correct attribute to get the load balancer's DNS name is dns_name.

4fill in blank

hard

Fill both blanks to output the subnet IDs from a list of subnets.

Terraform

output "subnet_ids" {
  value = [for subnet in [1] : subnet.[2]]
}

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Aaws_subnet.example

Baws_subnet.example.*

Cid

Dsubnet_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single resource instead of a list.

Using 'subnet_id' which is not a valid attribute.

To get all subnet IDs, iterate over the list aws_subnet.example.* and extract the id attribute.

5fill in blank

hard

Fill all three blanks to output a map of instance names to their private IPs, filtering only running instances.

Terraform

output "running_instances" {
  value = { for i in [1] : i.[2] => i.[3] if i.instance_state.name == "running" }
}

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Aaws_instance.all

Btags.Name

Cprivate_ip

Daws_instance.example

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single instance resource instead of a list.

Using incorrect attributes for name or IP.

Not filtering by running state.

This output creates a map from instance names (tags.Name) to their private IPs (private_ip) for instances in the aws_instance.all list that are running.