Overview

Terraform treats infrastructure as code. This article demonstrates building an AWS environment consisting of public and private subnets across two availability zones in ap-northeast-1.

Architecture

• Region: ap-northeast-1
• AZs: ap-northeast-1a, ap-northeast-1c
• Public subnets: 10.0.0.0/24, 10.0.128.0/24
• Private subnets: 10.0.16.0/24, 10.0.144.0/24

Each subnet hosts an EC2 instance with proper routing and security groups.

Prerequisites

Install Terraform and configure AWS credentials. Ensure Docker is available if you plan to run Terraform inside a container.

Terraform Configuration

Example main.tf:

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provider "aws" {
  region = "ap-northeast-1"
}

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "public_a" {
  vpc_id            = aws_vpc.main.id
  cidr_block        = "10.0.0.0/24"
  availability_zone = "ap-northeast-1a"
  map_public_ip_on_launch = true
}

Continue declaring private subnets, route tables and EC2 instances.

Initialize and apply:

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terraform init
terraform apply

Cleanup

Destroy resources when finished:

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terraform destroy

Conclusion

Terraform allows reproducible infrastructure setups and version control for cloud configurations.