VPC template

vpc.tf

# Rough Implementation of the pattern found here: https://medium.com/aws-activate-startup-blog/practical-vpc-design-8412e1a18dcc

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

# create a vpc
resource "aws_vpc" "shaselton" {
  cidr_block = "10.0.0.0/16"
  enable_dns_hostnames = true

  tags {
    Name = "shaselton_vpc"
  }
}

# AZ A
resource "aws_subnet" "az_a_private" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.0.0/19"
  availability_zone = "us-east-1a"

  tags {
    Name = "Availability Zone A Private"
  }
}

resource "aws_subnet" "az_a_public" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.32.0/20"
  availability_zone = "us-east-1a"

  tags {
    Name = "Availability Zone A Public"
  }
}

resource "aws_subnet" "az_a_public_protected" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.48.0/21"
  availability_zone = "us-east-1a"

  tags {
    Name = "Availability Zone A Public Protected"
  }
}

resource "aws_subnet" "az_a_public_spare" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.56.0/21"
  availability_zone = "us-east-1a"

  tags {
    Name = "Availability Zone A Public Spare"
  }
}

# AZ B
resource "aws_subnet" "az_b_private" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.64.0/19"
  availability_zone = "us-east-1b"

  tags {
    Name = "Availability Zone B Private"
  }
}

resource "aws_subnet" "az_b_public" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.96.0/20"
  availability_zone = "us-east-1b"

  tags {
    Name = "Availability Zone B Public"
  }
}

resource "aws_subnet" "az_b_public_protected" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.112.0/21"
  availability_zone = "us-east-1b"

  tags {
    Name = "Availability Zone B Public Protected"
  }
}
resource "aws_subnet" "az_b_public_spare" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.120.0/21"
  availability_zone = "us-east-1b"

  tags {
    Name = "Availability Zone B Public Spare"
  }
}
# AZ C
resource "aws_subnet" "az_c_private" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.128.0/19"
  availability_zone = "us-east-1c"

  tags {
    Name = "Availability Zone C Private"
  }
}

resource "aws_subnet" "az_c_public" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.160.0/20"
  availability_zone = "us-east-1c"

  tags {
    Name = "Availability Zone C Public"
  }
}

resource "aws_subnet" "az_c_public_protected" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.176.0/21"
  availability_zone = "us-east-1c"

  tags {
    Name = "Availability Zone C Public Protected"
  }
}

resource "aws_subnet" "az_c_public_spare" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.184.0/21"
  availability_zone = "us-east-1c"

  tags {
    Name = "Availability Zone C Public Spare"
  }
}

resource "aws_subnet" "spare_subnet" {
  vpc_id = "${aws_vpc.shaselton.id}"
  cidr_block = "10.0.192.0/18"

  tags {
    Name = "Spare Subnet Space"
  }
}