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Added Subnet And NAT Gateway Modules
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‎README.md‎

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# terraform-aws-vpc
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Hashicorp Terraform AWS VPC Module
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# AWS VPC Module
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Terraform AWS VPC Module

‎main.tf‎

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# AWS VPC Resources
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resource "aws_vpc" "vpc" {
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cidr_block = "${var.cidr}"
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cidr_block = var.cidr
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tags = {
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Name = "${var.prefix}-${var.environment}"
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vpc_id = aws_vpc.vpc.id
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tags = {
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Name = "${var.prefix}-${var.environment}"
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Name = "${var.prefix}-${var.environment}"
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Environment = var.environment
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}
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}
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}
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# AWS VPC Subnets Module - Public Subnet
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module "public_subnet" {
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source = "./modules/subnets"
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vpc_id = aws_vpc.vpc.id
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aws_internet_gateway_id = aws_internet_gateway.igw.id
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subnet_bits = var.subnet_bits
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cidr = var.cidr
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prefix = var.prefix
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environment = var.environment
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subnet_type = ["public"]
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}
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# AWS NAT Gateway Module
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module "nat_gateway" {
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source = "./modules/nat-gateways"
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prefix = var.prefix
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environment = var.environment
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public_subnet_ids = module.public_subnet.public_subnet_ids
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}
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# AWS VPC Subnets Module - Private Subnet
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# module "private_subnet" {
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# source = "./modules/subnets"
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# vpc_id = aws_vpc.vpc.id
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# aws_nat_gateway_id = module.nat_gateway.nat_gateway_ids
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# cidr = var.cidr
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# prefix = var.prefix
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# environment = var.environment
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# subnet_bits = var.subnet_bits
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# subnet_type = ["private", "storage"]
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# }

‎modules/nat-gateways/README.md‎

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# NAT Module

‎modules/nat-gateways/main.tf‎

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# AWS Availability Zones
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data "aws_availability_zones" "available_zones" {}
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# AWS Elastic IPs
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resource "aws_eip" "eip" {
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vpc = true
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count = length(data.aws_availability_zones.available_zones.names)
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tags = {
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Name = "${var.prefix}-${count.index + 1}"
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Environment = var.environment
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}
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}
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# AWS NAT Gateway Binding - Public Subnets
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resource "aws_nat_gateway" "nat_gateway" {
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allocation_id = element(aws_eip.eip.*.id, count.index)
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subnet_id = element(var.public_subnet_ids, count.index)
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count = length(data.aws_availability_zones.available_zones.names)
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tags = {
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Name = "${var.prefix}-${count.index + 1}"
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Environment = var.environment
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}
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}

‎modules/nat-gateways/output.tf‎

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output "nat_gateway_ids" {
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value = aws_nat_gateway.nat_gateway.*.id
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}
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output "eip_ids" {
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value = aws_eip.eip.*.id
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}

‎modules/nat-gateways/variables.tf‎

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variable "prefix" {
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description = "generic naming resources"
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type = string
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}
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variable "environment" {
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description = "To apply generic environment to AWS VPC Resources"
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type = string
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}
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variable "public_subnet_ids" {
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description = "list of public subnets in order of availability zones so that NAT Gateway's can be created in those respective subnets"
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type = list
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}

‎modules/subnets/README.md‎

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# Subnet Module

‎modules/subnets/main.tf‎

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# AWS Availability Zones
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data "aws_availability_zones" "available_zones" {}
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# AWS Public Subnets
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module "aws_public_subnet" {
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source = "./resources"
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create = contains(var.subnet_type, "public") ? 1 : 0
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prefix = var.prefix
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environment = var.environment
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vpc_id = var.vpc_id
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cidr = var.cidr
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subnet_bits = var.subnet_bits
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subnet_type = "public"
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}
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# AWS Private Subnets
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module "aws_private_subnet" {
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source = "./resources"
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create = contains(var.subnet_type, "private") ? 1 : 0
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prefix = var.prefix
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environment = var.environment
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vpc_id = var.vpc_id
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cidr = var.cidr
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offset = length(data.aws_availability_zones.available_zones.names)
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subnet_bits = var.subnet_bits
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subnet_type = "private"
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}
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# AWS Storage Subnets
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module "aws_storage_subnet" {
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source = "./resources"
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create = contains(var.subnet_type, "storage") ? 1 : 0
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prefix = var.prefix
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environment = var.environment
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cidr = var.cidr
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vpc_id = var.vpc_id
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offset = 2 * length(data.aws_availability_zones.available_zones.names)
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subnet_bits = var.subnet_bits
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subnet_type = "storage"
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}
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# AWS Route Tables - Public Route
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resource "aws_route" "public_route" {
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count = contains(var.subnet_type, "public") ? length(data.aws_availability_zones.available_zones.names) : 0
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route_table_id = module.aws_public_subnet.route_table_ids[count.index]
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destination_cidr_block = "0.0.0.0/0"
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gateway_id = var.aws_internet_gateway_id
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}
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# AWS Route Tables - Private Route
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resource "aws_route" "private_route" {
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count = contains(var.subnet_type, "private") ? length(data.aws_availability_zones.available_zones.names) : 0
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route_table_id = module.aws_private_subnet.route_table_ids[count.index]
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destination_cidr_block = "0.0.0.0/0"
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nat_gateway_id = var.aws_nat_gateway_id[count.index]
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}

‎modules/subnets/output.tf‎

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output "public_subnet_ids" {
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value = module.aws_public_subnet.subnet_ids
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}
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output "public_route_table_ids" {
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value = module.aws_public_subnet.route_table_ids
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}
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output "private_subnet_ids" {
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value = module.aws_private_subnet.subnet_ids
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}
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output "private_route_table_ids" {
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value = module.aws_private_subnet.route_table_ids
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}
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output "storage_subnet_ids" {
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value = module.aws_storage_subnet.subnet_ids
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}
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output "storage_route_table_ids" {
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value = module.aws_storage_subnet.route_table_ids
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}

‎modules/subnets/resources/main.tf‎

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# AWS Availability Zones
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data "aws_availability_zones" "available_zones" {}
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# AWS Subnets
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resource "aws_subnet" "subnets" {
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vpc_id = var.vpc_id
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count = var.create > 0 ? length(data.aws_availability_zones.available_zones.names) : 0
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cidr_block = cidrsubnet(var.cidr, var.subnet_bits, var.offset + count.index)
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availability_zone = data.aws_availability_zones.available_zones.names[count.index]
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tags = {
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Name = "${var.prefix}-${var.subnet_type}-${count.index + 1}"
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Environment = var.environment
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Type = var.subnet_type
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}
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}
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# AWS Route Tables
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resource "aws_route_table" "route_table" {
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vpc_id = var.vpc_id
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count = var.create > 0 ? length(data.aws_availability_zones.available_zones.names) : 0
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tags = {
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Name = "${var.prefix}-${var.subnet_type}-${count.index + 1}"
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Environment = var.environment
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Type = var.subnet_type
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}
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}
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# AWS Route Table - Subnet Association
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resource "aws_route_table_association" "subnet_association" {
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count = var.create > 0 ? length(data.aws_availability_zones.available_zones.names) : 0
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subnet_id = element(aws_subnet.subnets.*.id, count.index)
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route_table_id = element(aws_route_table.route_table.*.id, count.index)
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}

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