AWS VPC terraform module

A Terraform module to create an AWS VPC supporting public, private and database subnets plus NAT Gateways

Module Input Variables

• name - name for the VPC
• cidr - network block in CIDR notation
• public_subnets - list of public subnet CIDRs (defaults to empty)
• private_subnets - list of private subnet CIDRs (defaults to empty)
• database_subnets - list of private database subnet CIDRs (defaults to empty)
• azs - list of AZs in which to distribute subnets
• nat_gateway_count - number of NAT Gateways to create (defaults to -1)
• enable_dns_hostnames - use private DNS (defaults to true)
• enable_dns_support - use private DNS (defaults to true)
• map_public_ip_on_launch - auto-assign public IP on launch (defaults to true)
• tags - dictionary of tags that will be added to resources created by the module

NAT Gateways

nat_gateway_count	result
-1 (default)	create one per public subnet
0	do not create any
>= 1	create this many

Usage

1-tier with only private subnets

module "vpc" {
  source = "github.com/door2door-io/d2d-terraform-vpc?ref=v0.0.1"

  name            = "vpc-name"
  cidr            = "10.0.0.0/16"
  private_subnets = ["10.0.101.0/24", "10.0.102.0/24"]
  azs             = ["eu-central-1a", "eu-central-1b"]

  tags {
    "Terraform" = "true"
    "Environment" = "test"
  }
}

2-tier with public and private subnets + 1 shared NAT Gateway

module "vpc" {
  source = "github.com/door2door-io/d2d-terraform-vpc?ref=v0.0.1"

  name              = "vpc-name"
  cidr              = "10.0.0.0/16"
  public_subnets    = ["10.0.1.0/24", "10.0.2.0/24"]
  private_subnets   = ["10.0.101.0/24", "10.0.102.0/24"]
  azs               = ["eu-central-1a", "eu-central-1b"]
  nat_gateway_count = 1

  tags {
    "Terraform" = "true"
    "Environment" = "test"
  }
}

3-tier with public, private and database subnets + NAT Gateways

module "vpc" {
  source = "github.com/door2door-io/d2d-terraform-vpc?ref=v0.0.1"

  name              = "vpc-name"
  cidr              = "10.0.0.0/16"
  public_subnets    = ["10.0.1.0/24", "10.0.2.0/24"]
  private_subnets   = ["10.0.101.0/24", "10.0.102.0/24"]
  database_subnets  = ["10.0.201.0/24", "10.0.202.0/24"]
  azs               = ["eu-central-1a", "eu-central-1b"]
  nat_gateway_count = -1

  tags {
    "Terraform" = "true"
    "Environment" = "test"
  }
}

Outputs

• vpc_id - ID of the VPC
• public_subnet_ids - list of public subnet IDs
• public_route_table_ids - list of public route table IDs
• private_subnet_ids - list of private subnet IDs
• private_route_table_ids - list of private route table IDs
• database_subnet_ids - list of private database subnet IDs
• database_route_table_ids - list of private database route table IDs
• database_subnet_group - database subnet group name
• nat_gateway_ips - list of NAT Gateways public IP addresses