Create subnets for your existing VPC

This terraform module will deploy the following services:

• Subnets
• NAT Gateway (Optional)
• Route Table (Optional)
• NACL

Usage Instructions

Example

module "vpc" {
  source = "github.com/terrablocks/aws-vpc.git"

  network_name = "dev"
}

module "pub_subnet" {
  source = "github.com/terrablocks/aws-subnets.git"

  vpc_id = module.vpc.id
  cidr_blocks = {
    us-east-1a = "10.0.1.0/24"
    us-east-1b = "10.0.2.0/24"
    us-east-1c = "10.0.3.0/24"
  }
  subnet_name   = "public-subnet"
  map_public_ip = true
  rtb_name      = "public-rtb"
  attach_igw    = true
}

module "pvt_subnet" {
  source = "github.com/terrablocks/aws-subnets.git"

  vpc_id = module.vpc.id
  cidr_blocks = {
    us-east-1a = "10.0.4.0/24"
    us-east-1b = "10.0.5.0/24"
    us-east-1c = "10.0.6.0/24"
  }
  subnet_name     = "private-subnet"
  rtb_name        = "private-rtb"
  create_nat      = true
  natgw_subnet_id = module.pub_subnet.ids[0]
}

module "protected_subnet" {
  source = "github.com/terrablocks/aws-subnets.git"

  vpc_id = module.vpc.id
  cidr_blocks = {
    ap-south-1a = "10.0.7.0/24"
    ap-south-1b = "10.0.8.0/24"
    ap-south-1c = "10.0.9.0/24"
  }
  subnet_name = "protected-subnet"
  rtb_name    = "protected-rtb"
}

Requirements

Name	Version
terraform	>= 0.13
aws	>= 3.37.0

Inputs

Name	Description	Type	Default	Required
vpc_id	ID of VPC to associate resource with	string	n/a	yes
cidr_blocks	Map of availability zone and cidr block to assign { us-east-1a = "10.0.1.0/24" us-east-1b = "10.0.2.0/24" us-east-1c = "10.0.3.0/24" }	map(string)	{}	no
subnet_name	Name of subnet	string	""	no
map_public_ip	Automatically assign public ip to resources launched in this subnet	bool	false	no
create_rtb	Create route table for the subnet and associate it	bool	true	no
rtb_name	Name for route table to be created if create_rtb is set to true	string	null	no
rtb_id	Existing route table to associate with subnet. Note: Required only if create_rtb is set to false	string	""	no
attach_igw	Whether to attach internet gateway to the route table	bool	false	no
create_nat	Whether to create NAT gateway for subnet and associate it to the route table	bool	false	no
nat_eip_id	Allocation ID of existing EIP to attach to the NAT gateway. Leaving this blank will create a new EIP provided create_nat is set to true	string	""	no
natgw_subnet_id	Subnet ID to place NAT gateway in. Note: Required if create_nat is set to true	string	""	no
natgw_id	Existing NAT gateway to associate with route table	string	null	no
nacl_ingress_rules	Numbered ingress rules for NACL	list(object({ protocol = string rule_no = number action = string cidr_block = string from_port = number to_port = number }))	[ { "action": "allow", "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_no": 100, "to_port": 0 } ]	no
nacl_egress_rules	Numbered egress rules for NACL	list(object({ protocol = string rule_no = number action = string cidr_block = string from_port = number to_port = number }))	[ { "action": "allow", "cidr_block": "0.0.0.0/0", "from_port": 0, "protocol": "-1", "rule_no": 100, "to_port": 0 } ]	no
tags	Map of key-value pair to associate with resources	map(string)	{}	no

Outputs

Name	Description
ids	List of subnet ids
cidrs	List of subnet CIDR blocks
rtb_id	ID of route table associated with subnets
natgw_id	ID of NAT gateway associated to the route table
natgw_eip	Elastic IP associated to the NAT gateway
nacl_id	ID of network ACL associated with subnets