Terraform output command - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the terraform output command do?

It shows the values of output variables defined in your Terraform configuration after you apply changes. Think of it as checking the results or summary of what Terraform created.

beginner

How do you define an output variable in Terraform?

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

output "ip_address" {
  value = aws_instance.example.public_ip
}

This tells Terraform to save and show the public IP of the instance.

intermediate

What is the difference between terraform output and terraform output -json?

terraform output shows outputs in a human-readable format.<br>terraform output -json shows outputs in JSON format, which is useful for scripts or programs to read.

beginner

Can you use terraform output before running terraform apply?

No, because outputs are only available after Terraform creates or updates resources. Before applying, there is no output data to show.

beginner

Why is it useful to use output variables in Terraform?

Outputs help you share important information like IP addresses, URLs, or IDs after deployment. They make it easy to find and use these details without searching through resource states.

What command shows the output values after Terraform applies changes?

A terraform output

B terraform init

C terraform plan

D terraform destroy

terraform output displays the output variables after resources are created or updated.

Which flag shows outputs in JSON format?

A -yaml

B -text

C -json

D -xml

The -json flag formats output values as JSON for easy parsing.

When can you use terraform output to see outputs?

A After <code>terraform apply</code>

B Before <code>terraform init</code>

C Before <code>terraform plan</code>

D Before <code>terraform apply</code>

Outputs are only available after resources are created or updated with terraform apply.

How do you define an output variable in Terraform?

A Using a <code>resource</code> block

B Using a <code>variable</code> block

C Using a <code>provider</code> block

D Using an <code>output</code> block with a name and value

Output variables are defined with an output block specifying the value to show.

Why are output variables useful?

A To write Terraform modules

B To share important info like IPs or IDs after deployment

C To destroy resources

D To initialize Terraform providers

Outputs provide easy access to key information created by Terraform.

Explain how the terraform output command fits into the Terraform workflow.

Think about when you want to see results after deployment.

Describe how to define and use an output variable in Terraform.

Consider how Terraform shares info after creating resources.