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Terraform IAC for AWS Transit Gateway

Prerequisites

  • Terraform 0.12.x
  • aws cli

Input variables

Name Description Type
shared_credentials_file Path of AWS creds identifier String
profile AWS profile to use create these resources string
region Region id map(string)
vpc_id VPC id for existing vpc to create subnets string
additional_tags map(string)
create_tg Want to create Transit Gateway bool
description Description of the EC2 Transit Gateway string
dns_support Whether DNS support is enabled. Valid values: disable, enable string
amazon_side_asn Private Autonomous System Number (ASN) for the Amazon side of a BGP session. The range is 64512 to 65534 number
auto_accept_shared_attachments Whether resource attachment requests are automatically accepted. Valid values: disable, enable string
default_route_table_association Whether resource attachments are automatically associated with the default association route table. Valid values: disable, enable string
default_route_table_propagation Whether resource attachments automatically propagate routes to the default propagation route table. Valid values: disable, enable string
vpn_ecmp_support Whether VPN Equal Cost Multipath Protocol support is enabled. Valid values: disable, enable string
cgw_ip_address he IP address of the gateway's Internet-routable external interface. list(map(string))
allow_external_principals Indicates whether principals outside your organization can be associated with a resource share string
ram_principals The principal to associate with the resource share. Possible values are an AWS account ID, an AWS Organizations Organization ARN, or an AWS Organizations Organization Unit ARN. list
subnet_ids Identifiers of EC2 Subnets list
vpc_id Identifiers of EC2 Subnets. string
ipv6_support Whether IPv6 support is enabled. Valid values: disable, enable. Default value: disable string
transit_gateway_default_route_table_association Boolean whether the VPC Attachment should be associated with the EC2 Transit Gateway association default route table. string
transit_gateway_default_route_table_propagation Boolean whether the VPC Attachment should propagate routes with the EC2 Transit Gateway propagation default route table string
create_tg_route_table Do you want to create an Route table for TG bool
static_routes_only Whether the VPN connection uses static routes exclusively. Static routes must be used for devices that don't support BGP. bool
transit_gateway_vpc_attachment_ids Identifier of EC2 Transit Gateway Attachments list
tg_routes Routes for transit gateway attachments list(map(string))

Link: https://www.terraform.io/docs/configuration/variables.html

Use as Standalone TF template

cp input.tfvars.example input.tfvars
terraform init
terraform plan -var-file=./input.tfvars
terraform apply -var-file=./input.tfvars

Output variables

Name Description
tg_arn EC2 Transit Gateway Amazon Resource Name ARN
tg_association_default_route_table_id Identifier of the default association route table
tg_id EC2 Transit Gateway identifier
tg_propagation_default_route_table_id Identifier of the default propagation route table
cg_id The amazon-assigned ID of the gateway.
cg_bgp_asn The gateway's Border Gateway Protocol BGP Autonomous System Number (ASN).
ram_resource_share_arn The Amazon Resource Name ARN of the resource share.
ram_resource_share_id The Amazon Resource Name ARN of the resource share
ram_resource_associatiom_id The Amazon Resource Name ARN of the resource share
ram_principal_association The Amazon Resource Name ARN of the Resource Share and the principal, separated by a comma
transit_gateway_vpc_attachment_id EC2 Transit Gateway Attachment identifier