Initial commit

2026-10-12 04:35:04 +00:00 · 2026-08-19 12:46:34 +01:00
commit 88b020837b
6 changed files with 532 additions and 0 deletions
@@ -0,0 +1,26 @@
+# Terraform
+.terraform/
+*.tfstate
+*.tfstate.*
+*.tfplan
+crash.log
+crash.*.log
+
+# Variable files may contain secrets; commit only examples
+*.tfvars
+*.tfvars.json
+!*.tfvars.example
+
+# Local overrides
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+.terraformrc
+terraform.rc
+
+# Superseded RTF originals
+*.rtf
+
+# macOS
+.DS_Store
@@ -0,0 +1,45 @@
+# This file is maintained automatically by "terraform init".
+# Manual edits may be lost in future updates.
+
+provider "registry.terraform.io/hashicorp/aws" {
+  version     = "5.100.0"
+  constraints = "~> 5.0"
+  hashes = [
+    "h1:Ijt7pOlB7Tr7maGQIqtsLFbl7pSMIj06TVdkoSBcYOw=",
+    "zh:054b8dd49f0549c9a7cc27d159e45327b7b65cf404da5e5a20da154b90b8a644",
+    "zh:0b97bf8d5e03d15d83cc40b0530a1f84b459354939ba6f135a0086c20ebbe6b2",
+    "zh:1589a2266af699cbd5d80737a0fe02e54ec9cf2ca54e7e00ac51c7359056f274",
+    "zh:6330766f1d85f01ae6ea90d1b214b8b74cc8c1badc4696b165b36ddd4cc15f7b",
+    "zh:7c8c2e30d8e55291b86fcb64bdf6c25489d538688545eb48fd74ad622e5d3862",
+    "zh:99b1003bd9bd32ee323544da897148f46a527f622dc3971af63ea3e251596342",
+    "zh:9b12af85486a96aedd8d7984b0ff811a4b42e3d88dad1a3fb4c0b580d04fa425",
+    "zh:9f8b909d3ec50ade83c8062290378b1ec553edef6a447c56dadc01a99f4eaa93",
+    "zh:aaef921ff9aabaf8b1869a86d692ebd24fbd4e12c21205034bb679b9caf883a2",
+    "zh:ac882313207aba00dd5a76dbd572a0ddc818bb9cbf5c9d61b28fe30efaec951e",
+    "zh:bb64e8aff37becab373a1a0cc1080990785304141af42ed6aa3dd4913b000421",
+    "zh:dfe495f6621df5540d9c92ad40b8067376350b005c637ea6efac5dc15028add4",
+    "zh:f0ddf0eaf052766cfe09dea8200a946519f653c384ab4336e2a4a64fdd6310e9",
+    "zh:f1b7e684f4c7ae1eed272b6de7d2049bb87a0275cb04dbb7cda6636f600699c9",
+    "zh:ff461571e3f233699bf690db319dfe46aec75e58726636a0d97dd9ac6e32fb70",
+  ]
+}
+
+provider "registry.terraform.io/hashicorp/random" {
+  version = "3.9.0"
+  hashes = [
+    "h1:OO+IuvQJSPmWdN8AyyIEvPJbLvDQpgX/zbktoa9KsJE=",
+    "zh:161ad0bd9a75768c82f53fb6e7172a9d8be2d4889b012645a34795031aaf1bf1",
+    "zh:19dc9a5b17729725ccfc4f45b0500af0ee5bc6b6b160c7adb8f2bf617d2c80ea",
+    "zh:269eda8fe42daa7974d5a34d166c3ba9defe80cde86c01e4dadcfdf2e1f05e5f",
+    "zh:373f7c65566f8f2cc7f45d698654feb9d988996957e1266a69ca00c52d6d16d0",
+    "zh:5599d16804c41c83009ec621b6d6b6f74e102f5827678a4750f8809055546b61",
+    "zh:583be0440469a22bff70dcfa56593b01566860b29607437264adb51060cf46fc",
+    "zh:5f211d8ec3f2e1f414870d9584bfe26e6995560ef81c748f8447a48164767398",
+    "zh:78d5eefdd9e494defcb3c68d282b8f96630502cac21d1ea161f53cfe9bb483b3",
+    "zh:7b547fd16216761ef86efc3ed516ac5ac0c5c42b7c7eb24a08cef2d93f69ed5e",
+    "zh:7e7c0679daf2a382151d05068c8c3f0dae6b7b7dccf818827b73dd08638df2ef",
+    "zh:8089dec888a8038b9b4fb23b3df7e1057293dbc5b60b42cc47ff690d69d4b61b",
+    "zh:c51f15a031edfd6f23ce8ced3446ca7f8d8d647e2499890d7d5d10d5016d7257",
+    "zh:c94784f005708890dc6895afd53636ec00ec1e430b15d41e5aebfb1d4b39bd04",
+  ]
+}
@@ -0,0 +1,56 @@
+# hello-world-tf
+
+Minimal AWS network and storage baseline managed with Terraform. Creates a VPC with public and private subnets, an internet gateway, an optional NAT gateway, and a private S3 bucket. No compute resources.
+
+## What it creates
+
+- **VPC** — `10.0.0.0/16` by default, DNS support and hostnames enabled
+- **2 public subnets** (`10.0.1.0/24`, `10.0.2.0/24`) — auto-assign public IPs, routed to the internet gateway
+- **2 private subnets** (`10.0.10.0/24`, `10.0.20.0/24`) — own route table, no internet egress unless the NAT gateway is enabled
+- **Internet gateway** + public route table
+- **NAT gateway** (optional, off by default) — single NAT in the first public subnet with an Elastic IP; adds a default route for the private subnets
+- **S3 bucket** — `<project>-<env>-app-data-<random-suffix>`, versioning on by default, all public access blocked
+
+All resources are tagged with `Project`, `Environment`, `ManagedBy`, and `CreatedBy` via provider `default_tags`, plus anything passed in `additional_tags`.
+
+## Requirements
+
+| Name | Version |
+|------|---------|
+| Terraform | >= 1.6.0 |
+| AWS provider | ~> 5.0 |
+| Random provider | ~> 3.6 |
+
+AWS credentials must be available in the environment (profile, SSO, or environment variables).
+
+## Usage
+
+```sh
+terraform init
+terraform plan
+terraform apply
+```
+
+State is local. Configure a remote backend before using this beyond experiments.
+
+## Inputs
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| `project_name` | string | `aether-test` | Resource name prefix; lowercase letters, numbers, hyphens only |
+| `environment` | string | `dev` | One of `dev`, `staging`, `prod` |
+| `aws_region` | string | `eu-west-2` | AWS region |
+| `vpc_cidr` | string | `10.0.0.0/16` | VPC CIDR block |
+| `public_subnet_cidrs` | list(string) | `["10.0.1.0/24", "10.0.2.0/24"]` | Public subnet CIDRs |
+| `private_subnet_cidrs` | list(string) | `["10.0.10.0/24", "10.0.20.0/24"]` | Private subnet CIDRs |
+| `enable_s3_versioning` | bool | `true` | Toggle S3 bucket versioning |
+| `create_nat_gateway` | bool | `false` | Create NAT gateway for private subnet egress |
+| `additional_tags` | map(string) | `{}` | Extra tags merged into all resources |
+
+## Outputs
+
+VPC ID and CIDR, subnet IDs and CIDRs, internet gateway ID, public and private route table IDs, NAT gateway ID (null when disabled), S3 bucket name/ARN/region, AWS account ID and region, and a `resource_summary` object.
+
+## Cost notes
+
+Everything here is free or near-free except the NAT gateway: enabling `create_nat_gateway` costs roughly $0.05/hour plus data processing charges in eu-west-2. The single-NAT layout is a deliberate simplification for dev use; production would run one NAT per availability zone.
@@ -0,0 +1,217 @@
+########################################
+# Terraform Configuration
+########################################
+terraform {
+  required_version = ">= 1.6.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+    random = {
+      source  = "hashicorp/random"
+      version = "~> 3.6"
+    }
+  }
+}
+
+########################################
+# Provider Configuration
+########################################
+provider "aws" {
+  region = var.aws_region
+
+  default_tags {
+    tags = merge(
+      {
+        Project     = var.project_name
+        Environment = var.environment
+        ManagedBy   = "Terraform"
+        CreatedBy   = "Aether"
+      },
+      var.additional_tags
+    )
+  }
+}
+
+########################################
+# VPC
+########################################
+resource "aws_vpc" "main" {
+  cidr_block           = var.vpc_cidr
+  enable_dns_support   = true
+  enable_dns_hostnames = true
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-vpc"
+  }
+}
+
+########################################
+# Public Subnets
+########################################
+resource "aws_subnet" "public" {
+  count = length(var.public_subnet_cidrs)
+
+  vpc_id                  = aws_vpc.main.id
+  cidr_block              = var.public_subnet_cidrs[count.index]
+  availability_zone       = data.aws_availability_zones.available.names[count.index]
+  map_public_ip_on_launch = true
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-public-subnet-${count.index + 1}"
+    Type = "public"
+  }
+}
+
+########################################
+# Private Subnets
+########################################
+resource "aws_subnet" "private" {
+  count = length(var.private_subnet_cidrs)
+
+  vpc_id            = aws_vpc.main.id
+  cidr_block        = var.private_subnet_cidrs[count.index]
+  availability_zone = data.aws_availability_zones.available.names[count.index]
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-private-subnet-${count.index + 1}"
+    Type = "private"
+  }
+}
+
+########################################
+# Internet Gateway
+########################################
+resource "aws_internet_gateway" "main" {
+  vpc_id = aws_vpc.main.id
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-igw"
+  }
+}
+
+########################################
+# Public Route Table
+########################################
+resource "aws_route_table" "public" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block = "0.0.0.0/0"
+    gateway_id = aws_internet_gateway.main.id
+  }
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-public-rt"
+  }
+}
+
+resource "aws_route_table_association" "public" {
+  count = length(aws_subnet.public)
+
+  subnet_id      = aws_subnet.public[count.index].id
+  route_table_id = aws_route_table.public.id
+}
+
+########################################
+# NAT Gateway (optional)
+########################################
+resource "aws_eip" "nat" {
+  count = var.create_nat_gateway ? 1 : 0
+
+  domain = "vpc"
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-nat-eip"
+  }
+
+  depends_on = [aws_internet_gateway.main]
+}
+
+resource "aws_nat_gateway" "main" {
+  count = var.create_nat_gateway ? 1 : 0
+
+  allocation_id = aws_eip.nat[0].id
+  subnet_id     = aws_subnet.public[0].id
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-nat"
+  }
+
+  depends_on = [aws_internet_gateway.main]
+}
+
+########################################
+# Private Route Table
+########################################
+resource "aws_route_table" "private" {
+  vpc_id = aws_vpc.main.id
+
+  tags = {
+    Name = "${var.project_name}-${var.environment}-private-rt"
+  }
+}
+
+resource "aws_route" "private_nat" {
+  count = var.create_nat_gateway ? 1 : 0
+
+  route_table_id         = aws_route_table.private.id
+  destination_cidr_block = "0.0.0.0/0"
+  nat_gateway_id         = aws_nat_gateway.main[0].id
+}
+
+resource "aws_route_table_association" "private" {
+  count = length(aws_subnet.private)
+
+  subnet_id      = aws_subnet.private[count.index].id
+  route_table_id = aws_route_table.private.id
+}
+
+########################################
+# S3 Bucket for Application Data
+########################################
+resource "aws_s3_bucket" "app_data" {
+  bucket = "${var.project_name}-${var.environment}-app-data-${random_id.bucket_suffix.hex}"
+
+  tags = {
+    Name        = "${var.project_name}-${var.environment}-app-data"
+    Description = "Application data storage"
+  }
+}
+
+resource "aws_s3_bucket_versioning" "app_data" {
+  bucket = aws_s3_bucket.app_data.id
+
+  versioning_configuration {
+    status = var.enable_s3_versioning ? "Enabled" : "Disabled"
+  }
+}
+
+resource "aws_s3_bucket_public_access_block" "app_data" {
+  bucket = aws_s3_bucket.app_data.id
+
+  block_public_acls       = true
+  block_public_policy     = true
+  ignore_public_acls      = true
+  restrict_public_buckets = true
+}
+
+########################################
+# Random ID for unique bucket naming
+########################################
+resource "random_id" "bucket_suffix" {
+  byte_length = 4
+}
+
+########################################
+# Data Sources
+########################################
+data "aws_availability_zones" "available" {
+  state = "available"
+}
+
+data "aws_caller_identity" "current" {}
+
+data "aws_region" "current" {}
@@ -0,0 +1,105 @@
+########################################
+# VPC Outputs
+########################################
+output "vpc_id" {
+  description = "ID of the VPC"
+  value       = aws_vpc.main.id
+}
+
+output "vpc_cidr" {
+  description = "CIDR block of the VPC"
+  value       = aws_vpc.main.cidr_block
+}
+
+########################################
+# Subnet Outputs
+########################################
+output "public_subnet_ids" {
+  description = "IDs of public subnets"
+  value       = aws_subnet.public[*].id
+}
+
+output "private_subnet_ids" {
+  description = "IDs of private subnets"
+  value       = aws_subnet.private[*].id
+}
+
+output "public_subnet_cidrs" {
+  description = "CIDR blocks of public subnets"
+  value       = aws_subnet.public[*].cidr_block
+}
+
+output "private_subnet_cidrs" {
+  description = "CIDR blocks of private subnets"
+  value       = aws_subnet.private[*].cidr_block
+}
+
+########################################
+# Networking Outputs
+########################################
+output "internet_gateway_id" {
+  description = "ID of the Internet Gateway"
+  value       = aws_internet_gateway.main.id
+}
+
+output "public_route_table_id" {
+  description = "ID of the public route table"
+  value       = aws_route_table.public.id
+}
+
+output "private_route_table_id" {
+  description = "ID of the private route table"
+  value       = aws_route_table.private.id
+}
+
+output "nat_gateway_id" {
+  description = "ID of the NAT Gateway (null if not created)"
+  value       = var.create_nat_gateway ? aws_nat_gateway.main[0].id : null
+}
+
+########################################
+# S3 Outputs
+########################################
+output "s3_bucket_name" {
+  description = "Name of the S3 bucket"
+  value       = aws_s3_bucket.app_data.id
+}
+
+output "s3_bucket_arn" {
+  description = "ARN of the S3 bucket"
+  value       = aws_s3_bucket.app_data.arn
+}
+
+output "s3_bucket_region" {
+  description = "Region of the S3 bucket"
+  value       = aws_s3_bucket.app_data.region
+}
+
+########################################
+# AWS Account Information
+########################################
+output "aws_account_id" {
+  description = "AWS Account ID"
+  value       = data.aws_caller_identity.current.account_id
+}
+
+output "aws_region" {
+  description = "AWS Region"
+  value       = data.aws_region.current.name
+}
+
+########################################
+# Resource Summary
+########################################
+output "resource_summary" {
+  description = "Summary of created resources"
+  value = {
+    vpc_created              = true
+    public_subnets_count     = length(aws_subnet.public)
+    private_subnets_count    = length(aws_subnet.private)
+    s3_bucket_created        = true
+    s3_versioning_enabled    = var.enable_s3_versioning
+    internet_gateway_created = true
+    nat_gateway_created      = var.create_nat_gateway
+  }
+}
@@ -0,0 +1,83 @@
+########################################
+# Project Configuration
+########################################
+variable "project_name" {
+  type        = string
+  description = "Name of the project (used for resource naming)"
+  default     = "aether-test"
+
+  validation {
+    condition     = can(regex("^[a-z0-9-]+$", var.project_name))
+    error_message = "Project name must contain only lowercase letters, numbers, and hyphens."
+  }
+}
+
+variable "environment" {
+  type        = string
+  description = "Environment name (dev, staging, prod)"
+  default     = "dev"
+
+  validation {
+    condition     = contains(["dev", "staging", "prod"], var.environment)
+    error_message = "Environment must be dev, staging, or prod."
+  }
+}
+
+########################################
+# AWS Configuration
+########################################
+variable "aws_region" {
+  type        = string
+  description = "AWS region for resources"
+  default     = "eu-west-2"
+}
+
+########################################
+# Network Configuration
+########################################
+variable "vpc_cidr" {
+  type        = string
+  description = "CIDR block for the VPC"
+  default     = "10.0.0.0/16"
+
+  validation {
+    condition     = can(cidrhost(var.vpc_cidr, 0))
+    error_message = "Must be a valid IPv4 CIDR block."
+  }
+}
+
+variable "public_subnet_cidrs" {
+  type        = list(string)
+  description = "CIDR blocks for public subnets"
+  default     = ["10.0.1.0/24", "10.0.2.0/24"]
+}
+
+variable "private_subnet_cidrs" {
+  type        = list(string)
+  description = "CIDR blocks for private subnets"
+  default     = ["10.0.10.0/24", "10.0.20.0/24"]
+}
+
+########################################
+# Feature Flags
+########################################
+variable "enable_s3_versioning" {
+  type        = bool
+  description = "Enable versioning for S3 buckets"
+  default     = true
+}
+
+variable "create_nat_gateway" {
+  type        = bool
+  description = "Create NAT Gateway for private subnet internet access"
+  default     = false
+}
+
+########################################
+# Tags
+########################################
+variable "additional_tags" {
+  type        = map(string)
+  description = "Additional tags to apply to all resources"
+  default     = {}
+}