Assignment

The Nautilus DevOps team is strategizing the migration of a portion of their infrastructure to the AWS cloud. As part of this phased migration approach, they need to allocate an Elastic IP address to support external access for specific workloads.

For this task, create an AWS Elastic IP using Terraform with the following requirement:

The Elastic IP name xfusion-eip should be stored in a variable named KKE_eip. The Terraform working directory is /home/bob/terraform. Note:

The configuration values should be stored in a variables.tf file.

The Terraform script should be structured with a main.tf file referencing variables.tf.

Right-click under the EXPLORER section in VS Code and select Open in Integrated Terminal to launch the terminal.

Solution

Elastic IP with Variables — `xfusion-eip` (`KKE_eip`)

Two-file structure: variables.tf holds the config, main.tf references it. The Elastic IP name must be stored in a variable named exactly KKE_eip.

`variables.tf`

variable "KKE_eip" {
  description = "Name of the Elastic IP"
  type        = string
  default     = "xfusion-eip"
}

`main.tf`

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 6.0"
    }
  }
}

provider "aws" {
  region = "us-east-1"
}

resource "aws_eip" "xfusion_eip" {
  domain = "vpc"

  tags = {
    Name = var.KKE_eip
  }
}

How to run

cd /home/bob/terraform
terraform init
terraform apply -auto-approve

How it works

Splitting config from logic

Terraform merges every .tf file in the directory into one configuration, so variables.tf and main.tf work as a single unit with no imports. variables.tf declares inputs; main.tf declares resources that consume them via var.<name>.

The variable

variable "KKE_eip" — holds the Elastic IP name, exactly as required. The default of xfusion-eip lets terraform apply run without prompting.
type = string validates the input type at plan time.

The Elastic IP

domain = "vpc" — allocates the EIP for use in a VPC. This is the modern argument; the old vpc = true was removed in AWS provider v5+, so on ~> 6.0 you must use domain. Since the task only asks to allocate the address (no instance or ENI association), no instance or network_interface argument is set.
tags = { Name = var.KKE_eip } — an Elastic IP has no native name field, so the Name tag (resolved from the variable to xfusion-eip) is what the console and graders read as its name.

The var. prefix interpolates the declared variable's value. Because the variable has a default, terraform apply runs non-interactively.

Cost note: an unassociated Elastic IP incurs an hourly charge, but that's the sandbox's concern — the task only requires the allocation to exist.

Verify

aws ec2 describe-addresses \
  --filters Name=tag:Name,Values=xfusion-eip \
  --query 'Addresses[0].{IP:PublicIp,AllocId:AllocationId,Name:Tags[?Key==`Name`]|[0].Value}'

Expected — a public IP, an allocation ID, and Name: xfusion-eip.

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