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vpc terraform module

A terraform module to provide a VPC in AWS.

Module Input Variables

  • aws_region - the aws region in which to build the resources (Default: eu-west-1)
  • vpc_name - the name of the vpc and the name to be used on all the resources created by the module (required)
  • vpc_cidr_block - the CIDR block for the VPC (required)
  • automatic_networking - enable or disable automatic networking (automatic creation of public/private subnets)
  • create_private_subnets - enable or disable the creation of private subnets (default: true)
  • create_public_subnets - enable or disable the creation of public subnets (default: true)
  • az_limit - the number of availability zones to use when automatic_networking in enabled (default: 2)
  • manual_azs - enable or disable automatic availability zone allocation (when automatic_networking = true)
  • automatic_azs - enable or disable automatic availability zone allocation (when automatic_networking = false)
  • instance_tenancy - tenancy option for instances launched into the VPC (optional)
  • public_subnets - list of public subnet cidrs (optional)
  • private_subnets - list of private subnet cidrs (optional)
  • azs - list of AZs in which to distribute subnets (optional)
  • enable_dns_hostnames - should be true if you want to use private DNS within the VPC
  • enable_dns_support - should be true if you want to use private DNS within the VPC
  • map_public_ip_on_launch - should be false if you do not want to auto-assign public IP on launch
  • private_propagating_vgws - list of VGWs the private route table should propagate
  • public_propagating_vgws - list of VGWs the public route table should propagate
  • default_tags - dictionary of tags that will be added to resources created by the module
  • tags - optional additional tags to be added to resources created by the module

Usage

Automatic (Default)

module "vpc" {
  source = "<path to module>"

  vpc_name        = "my-vpc"
  vpc_cidr_block  = "10.100.0.0/16"
}

Manual

module "vpc" {
  source = "<path to module>"

  vpc_name        = "my-vpc"

  my_cidr_block   = "10.0.0.0/16"
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
  public_subnets  = ["10.0.101.0/24", "10.0.102.0/24", "10.0.103.0/24"]
  azs             = ["us-west-2a", "us-west-2b", "us-west-2c"]
}

Advanced options (Manually defined availability zones with automatic networking)

module "vpc" {
  source = "path to module"

  vpc_name        = "my-vpc"
  vpc_cidr_block  = "10.100.0.0/16"

  manual_azs      = true
  azs             = ["us-west-2b", "us-west-2c"]
}

Advanced options (Automatically defined availability zones with manual networking)

module "vpc" {
  source = "<path to module>"

  vpc_name        = "my-vpc"
  my_cidr_block   = "10.0.0.0/16"

  private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
  public_subnets  = ["10.0.101.0/24", "10.0.102.0/24", "10.0.103.0/24"]

  automatic_azs   = true
}

Advanced options (Custom tags)

module "vpc" {
  source = "path to module"

  vpc_name        = "my-vpc"
  vpc_cidr_block  = "10.100.0.0/16"

  tags {
    "Environment" = "${var.environment}"
    "Last Run" = "${format("%s", timestamp())}"
  }
}

Output

  • account_id - the id of the acount the vpc has been created in
  • vpc_id - does what it says on the tin
  • vpc_cidr_block - the cidr block used for the VPC
  • availability_zones - a list of availability_zones the resources have been built in
  • availability_zones_str - a comma separated string of availability_zones the resources have been built in
  • az_count - the number of availability zones resources have been built in
  • private_subnets - list of private subnet ids
  • private_subnets_str - a comma separated string of private subnet ids
  • public_subnets - list of public subnet ids
  • public_subnets_str - a comma separated string of public subnet ids
  • public_route_table_ids - list of public route table ids
  • public_route_table_ids_str - a comma separated string of public route table ids
  • private_route_table_ids - list of private route table ids
  • private_route_table_ids_str - a comma separated string of private route table ids
  • default_security_group_id - VPC default security group id string
  • main_route_table_id - id of the main route table for the VPC
  • nat_eips - list of Elastic IP ids (if any are provisioned)
  • nat_eips_str - a comma separated string of Elastic IP ids (if any are provisioned)
  • nat_eips_public_ips - list of NAT gateways' public Elastic IP's (if any are provisioned)
  • nat_eips_public_ips_str - a comma separated string of NAT gateways' public Elastic IP's (if any are provisioned)
  • nat_gateway_ids - list of NAT gateway ids
  • nat_gateway_ids_str - a comma separated string of NAT gateway ids
  • internet_gateway_id - Internet Gateway id string

TODO

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Module for creating VPC's in Terraform, modeled after Terraform World

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