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Terraform Outputs

Output values make information about your infrastructure available after a terraform apply. They are useful for displaying IP addresses, resource IDs, or any computed value you need for other systems or for a human user.

Declaring an Output

Use the output block with a name and a value expression.
output "instance_ip" {
  value = aws_instance.web.public_ip
}
After applying, Terraform prints the output values.

Output Description

Add a description to document the output:
output "instance_ip" {
  description = "Public IP address of the web server"
  value       = aws_instance.web.public_ip
}

Sensitive Outputs

Mark an output as sensitive to hide it from logs and CLI output (e.g., for passwords).
output "db_password" {
  value     = random_password.db.result
  sensitive = true
}

Using Outputs in Other Configurations

If you use remote state (covered later), you can access outputs from another Terraform configuration using data.terraform_remote_state.

Example: Multiple Outputs

output "web_server_ip" {
  value = aws_instance.web.public_ip
}

output "security_group_id" {
  value = aws_security_group.web_sg.id
}

output "instance_id" {
  value = aws_instance.web.id
}


Two Minute Drill
  • Outputs expose resource attributes after apply.
  • Define with output "name" { value = expression }.
  • Add sensitive = true to hide values.
  • Useful for passing information to other Terraform configs or scripts.

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