VPC-terraform.tf

variable "aws_region" {
    description = "EC2 Region for the VPC"
    default = "us-east-1"
}

variable "amis" {
    description = "AMIs by region"
    default = {
        eu-west-1 = "ami-f1810f86" # ubuntu 14.04 LTS
    }
}

variable "vpc_cidr" {
    description = "CIDR for the whole VPC"
    default = "10.1.0.0/16"
}

variable "public_subnet_cidr" {
    description = "CIDR for the Public Subnet"
    default = "10.1.0.0/24"
}

variable "private_subnet_cidr" {
    description = "CIDR for the Private Subnet"
    default = "10.1.1.0/24"
}


resource "aws_vpc" "default" {
    cidr_block = "${var.vpc_cidr}"
    enable_dns_hostnames = true
    tags {
        Name = "terraform-aws-vpc-abc123"
    }
}

resource "aws_internet_gateway" "default" {
    vpc_id = "${aws_vpc.default.id}"
}

resource "aws_eip" "nat" {
    vpc = true
}

resource "aws_nat_gateway" "gw" {
    allocation_id = "${aws_eip.nat.id}"
    subnet_id = "${aws_subnet.us-east-1a-public.id}"
}

/*
  Public Subnet
*/
resource "aws_subnet" "us-east-1a-public" {
    vpc_id = "${aws_vpc.default.id}"

    cidr_block = "${var.public_subnet_cidr}"
    availability_zone = "us-east-1a"

    tags {
        Name = "Test Public Subnet"
    }
}

resource "aws_route_table" "us-east-1a-public" {
    vpc_id = "${aws_vpc.default.id}"

    route {
        cidr_block = "0.0.0.0/0"
        gateway_id = "${aws_internet_gateway.default.id}"
    }

    tags {
        Name = "Test Public Subnet"
    }
}

resource "aws_route_table_association" "us-east-1a-public" {
    subnet_id = "${aws_subnet.us-east-1a-public.id}"
    route_table_id = "${aws_route_table.us-east-1a-public.id}"
}

/*
  Private Subnet
*/
resource "aws_subnet" "us-east-1a-private" {
    vpc_id = "${aws_vpc.default.id}"

    cidr_block = "${var.private_subnet_cidr}"
    availability_zone = "us-east-1a"

    tags {
        Name = "Test Private Subnet"
    }
}

resource "aws_route_table" "us-east-1a-private" {
    vpc_id = "${aws_vpc.default.id}"

    route {
        cidr_block = "0.0.0.0/0"
        nat_gateway_id = "${aws_nat_gateway.gw.id}"
    }

    tags {
        Name = "Test Private Subnet"
    }
}

resource "aws_route_table_association" "us-east-1a-private" {
    subnet_id = "${aws_subnet.us-east-1a-private.id}"
    route_table_id = "${aws_route_table.us-east-1a-private.id}"
}