Terraform aws transit gateway

Terraform aws transit gateway DEFAULT

Connect an Amazon Transit Gateway to your HashiCorp Virtual Network

HashiCorp Cloud Platform (HCP) is a fully managed platform offering HashiCorp Products as a Service (HPaaS) to automate infrastructure on any cloud.

This tutorial will cover the process required to create a transit gateway attachment that enables communication between your HashiCorp Virtual Network (HVN) and your Amazon transit gateway.

The workflow is:

  • Create an HVN
  • Create a resource share between your HVN and your Amazon transit gateway
  • Create a transit gateway attachment from your HVN to your transit gateway
  • Configure L3 routing and security

An Amazon transit gateway is a network transit hub that can be used to connect Virtual Private Clouds (VPCs) or on-prem networks even across Amazon regions. Transit gateways can be used to simplify AWS networking by enabling a hub and spoke configuration as opposed to requiring a separate peered connection for resources that need to communicate. Transit gateways use the concept of attachments to describe resources that have been connected to a transit gateway.

Examples of resources that can be attached to a transit gateway include:

  • One or more VPCs
  • SD-WAN/third-party network appliances
  • AWS Direct Connect gateways
  • Peering connections with another transit gateways
  • VPN connections


To complete this tutorial, you will need:

»Amazon networking requirements

Since your HVN is part of an AWS VPC, you can create a transit gateway attachment between your HVN and an AWS transit gateway. Your HVN must be in the same region as the transit gateway you wish to attach it to. However, transit gateways created in different regions can be connected to each other. This allows your AWS resources to be multi-region without requiring any additional configuration for your HVN.

To complete this tutorial, your VPC and a transit gateway must be in the same region as your HVN. Refer to the official AWS documentation for guidance on how to create a VPC or a transit gateway

You must also create a transit gateway attachment between your VPC and your transit gateway. Remember that a transit gateway enables a hub and spoke networking model. The transit gateway is the hub, and your VPC will be your first spoke. You can use the AWS Web Console to create the transit gateway attachment now.

»Create a HashiCorp Virtual Network (HVN)

Once you have created your VPC, transit gateway, and an attachment between them, you will need to create an HVN from the HCP Portal. You will then create another transit gateway attachment from your HVN to your transit gateway. Your HVN will be the second spoke off of your transit gateway hub. Again, your HVN must be created in the same region as the VPC and transit gateway you wish to attach it to.

In the navigation area of the HCP portal, select HashiCorp Virtual Network from the navigation menu to load the HVN resource overview page. Then click Create Network to configure and deploy your HVN. You will have the option to name your HVN, select a region, and specify the CIDR block value. The default CIDR block value is .

Note: You must select a CIDR range that does not overlap with the AWS VPC that you will be peering with later.

Once the HVN is deployed, the status will update to Stable on the HVN overview tab.

»Create a transit gateway attachment to your HVN

Once your HVN and your transit gateway have been created, you will need to create a transit gateway attachment that associates your Amazon transit gateway with your HVN. Because your HVN belongs to an AWS organization managed by HashiCorp, you must first define an AWS resource share that allows the two organizations to share resources. You can use the HCP Portal to help you create the resource share using the AWS CLI, or you can create the resource share in the AWS Web Console. Once you have created the resource share, you must enter the resource share ARN, along with the Amazon transit gateway ID into the HCP Portal. This tutorial provides instructions for both processes.

To create a transit gateway attachment, select the Transit gateway attachments tab from your HVN details page.

Transit gateway attachment

Click Create attachment.

Select either the Terminal or Web Console tab to create a transit gateway attachment.

The Step 1 section of the terminal input form will prompt you for your:

  • AWS Account ID
  • Amazon Transit Gateway ID
  • Region

Once you enter these values, the form will generate an AWS CLI command that you can copy and paste into your terminal to create the required resource share.

Transit gateway attachment

Open a terminal and execute the AWS CLI command.

$aws ram create-resource-share \ --name [GENERATED-NAME]\ --resource-arns [TARGET-RESOURCE-ARN]\ --principals [PRINCIPAL-ID]

Example output:


The command output includes the resourceShareArn value. Copy this value, and paste it into the Resource share ARN field under the Step 2 section of the form.

Transit gateway attachment

Finally, enter the CIDR block targets from your transit gateway. You can find these values in the route table associated with your transit gateway, or in the detailed view of the transit gateway resource. You may add as many CIDR block destinations as as you like, so as long as none of them overlap. HCP will not allow overlapping CIDR blocks. If you provide an overlapping CIDR at TGW attachment creation time, HCP will reject the attempt.

Once you have finished entering the resource share ARN, the Amazon transit gateway ID, and all the destination CIDR blocks, click the Create attachment button to create the transit gateway attachment. The HCP Portal will now show your transit gateway attachment with a status of Pending Acceptance.

Transit gateway attachment - Pending Acceptance

»Accept the attachment

Now that you have initiated the attachment from the HCP Portal, the attachment shows in your list of transit gateway attachments for your HVN, but the status is set to Pending Acceptance.

Navigate to the Transit Gateway Attachments screen in the AWS Web Console, and accept the attachment that you created.

Transit gateway attachment - Accept

Once you have accepted the attachment, the status in the HCP Portal changes to Active, and your transit gateway set up will be complete. (This may take a couple of minutes.)

Transit gateway attachment - Accept

»Configure L3 routing and security

Creating a transit gateway attachment is just the first step in establishing network connectivity between your HVN and your Amazon transit gateway. AWS is secure by default. This means that, by default, no routes have been specified and all ports are blocked.

To configure L3 routing that will allow communications between your HVN and your VPC resources you must:

  • Configure a security group
  • Create a route
  • Define ingress and egress rules

»Configure a security group

Protocol and port permissions for AWS traffic are managed via security groups. You will need to configure both protocol and port permissions for traffic that will be flowing between your HVN and your Amazon transit gateway. If you have not yet created a security group you must create one now, and make sure it is associated with your VPC. For instructions on how to create a security group from the AWS console, refer to the official documentation.

You can also use the AWS CLI. The following command will create a security group associated with your VPC. You will need your AWS VPC ID to create a security group associated with your AWS VPC.

$aws ec2 create-security-group --group-name hcp-group --description "HCP security group" --vpc-id [VPC-ID]{ "GroupId": "[SECURITY-GROUP-ID]"}

Make note of the security group ID in the output. You will use it in subsequent steps of the tutorial.

Note: If you are planning to connect your HVN to an EKS cluster, you do not need to create a new security group. Instead, you must identify the security group that your cluster instances are secured with, and use that security group specifically for the remainder of the tutorial.

»Create a route

You must create a route from your HVN to the Amazon transit gateway. For instructions on how to configure the route from the AWS console, refer to the official documentation.

You can also use the AWS CLI to create a route. You will need:

  • The transit gateway ID (available from the transit gateway attachments screen in the HCP Portal's HVC page)
  • The route table ID for the route table associated with your VPC (available from the AWS console)
  • The CIDR block of the HVN you created in the HCP Portal

Issue the following command to create a route for your transit gateway.

$aws ec2 create-route --route-table-id [ROUTE-TABLE-ID] --destination-cidr-block [HVN-CIDR] --transit-gateway-id [TRANSIT-GATEWAY-ID]{ "Return": true}

»Authorize ingress and egress

You must also authorize ingress and egress traffic. To authorize security group ingress and egress, you will need:

  • Your Amazon security group ID
  • The HVN CIDR
  • The Amazon transit gateway region

»Outbound (Egress)

The table below documents the egress configuration that must be applied to the security group.

ProtocolFrom PortTo PortDestinationPurpose

You can use the following command to apply the configuration listed above to your security group.

$aws ec2 --region [TARGET-VPC-REGION]\ authorize-security-group-egress --group-id [SECURITY-GROUP-ID] --ip-permissions \IpProtocol=tcp,FromPort=,ToPort=,IpRanges='[{CidrIp=[HVN-CIDR]}]'


$aws ec2 --region us-west-2 \ authorize-security-group-egress --group-id --ip-permissions \IpProtocol=tcp,FromPort=,ToPort=,IpRanges='[{CidrIp=/20}]'

If you encounter any issues, review the AWS documentation on how to update security groups.

»Next steps

In this tutorial, you used the HCP Portal to create a transit gateway attachment between your HVN and your AWS transit gateway so that you would be able to connect HCP resources with resources in AWS. With the steps complete, the transit gateway should be listed as Active in the HCP Portal. This did not mean packets were actually flowing. HCP has no way to detect if routing is configured correctly in your transit gateway.

You will need to confirm that these steps were performed correctly by connecting HCP resources located in your HVN to other resources connected to your transit gateway. To validate your manual setup, and get hands-on experience with HCP managed features, you can review the following tutorials:

To learn more about how to use Vault on HCP, visit our HCP Vault collection.

If you encounter any issues, please contact the HCP team at support.hashicorp.com.

Sours: https://learn.hashicorp.com/tutorials/cloud/amazon-transit-gateway?in=vault/cloud-ops

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Cloud Posse

Terraform module to provision:

  • AWS Transit Gateway
  • AWS Resource Access Manager (AWS RAM) Resource Share to share the Transit Gateway with the Organization or another AWS Account (configurable via the variables and )
  • Transit Gateway route table
  • Transit Gateway VPC attachments to connect multiple VPCs via the Transit Gateway
  • Transit Gateway route table propagations to create propagated routes and allow traffic from the Transit Gateway to the VPC attachments
  • Transit Gateway route table associations to allow traffic from the VPC attachments to the Transit Gateway
  • Transit Gateway static routes (static routes have a higher precedence than propagated routes)
  • Subnet routes to route traffic from the subnets in each VPC to the other Transit Gateway VPC attachments

This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

It's % Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!


This module is configurable via the variable - see usage and examples below.

The variable is a map of environment names (e.g. , , ) to the environment configurations.

Each environment configuration contains the following fields:

  • - The ID of the VPC for which to create a VPC attachment and route table associations and propagations.
  • - VPC CIDR block.
  • - The IDs of the subnets in the VPC.
  • - A list of Transit Gateway static route configurations. Note that static routes have a higher precedence than propagated routes.
  • - The IDs of the subnet route tables. The route tables are used to add routes to allow traffix from the subnets in one VPC to the other VPC attachments.
  • - A set of environment names to route traffic from the current environment to the specified environments. In the example below, in the environment we create subnet routes to route traffic from the subnets to the VPC attachments in the and environments. Specify either or . supersedes .
  • - A set of VPC CIDR blocks to route traffic from the current environment to the specified VPC CIDR blocks. In the example below, in the environment we create subnet routes to route traffic from the subnets to the VPC CIDR. Specify either or . supersedes .
  • - An existing Transit Gateway Attachment ID. If provided, the module will use it instead of creating a new one.

You now have the option to have Terraform manage route table entries by key, whereas previously they were only managed by index. The advantage of managing them by key is that if a route table ID or destination CIDR changes, only that entry is affected, whereas when managed by index, all the entries after the first affected index may be destroyed and re-created at a different index. The reason this is left as an option, with the default being to manage the entries by index, is that if you are creating the VPC or subnets at the same time you are creating the Transit Gateway, then Terraform will not be able to generate the keys during the plan phase and the plan will fail with the error . We recommend setting to unless you get this error, in which case you must leave it set to its default value of .

NOTE: This module requires Terraform and newer since it uses module expansion with .

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.


IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

Here's how to invoke this module in your projects:

Sours: https://github.com/cloudposse/terraform-aws-transit-gateway
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AWS Transit Gateway scenario with Terraform

This project gives an example of the usage of the recently (november ) announced AWS Transit Gateway product. That component provides a way to interconnect multiple VPCs in a hub-spoke topology.

The Transit Gateway is meant to superseed the more complex and expensive Transit VPC technology. This is a didactic example to showcase how a Transit VPC should be configured to achieve a non-trivial (full mesh) scenario. I hope it can be helpful.


A Transit Gateway relies on Route Tables. By default, a new Route Table is created in the Transit Gateway, which populates with the routing info toward every VPC attached to the gateway (the full mesh scenario) The Terraform code in this project demonstrates a more complex scenario in which traffic is isolated based on the environment. Four VPCs are created, with two subnets each (in separate AZs):

  • VPC in the 'dev' environment
  • VPC in the 'dev' environment
  • VPC in the 'shared' environment
  • VPC in the 'prod' environment

Let's assume the 'shared' environment will host shared components, such as proxy services, tools, Here are the rules we want our Transit Gateway to implement:

  • The shared VPC can access dev and prod VPCs.
  • The dev VPCs can access each other, and the shared VPC
  • The prod VPCs can only access the shared VPC

To enable such a scenario, three Route Tables are created in the Transit Gateway, one per environment. Which means both dev VPCs attach to the same Route Table, whereas the shared and prod VPCs each attach to their respective Route Table. Each VPC gets a t2.micro Ubuntu instance to validate the network connectivity over ssh and ICMP (ping). The instance in the 'shared' is assigned a public IP so a VPN connection isn't needed. Adding the necessary Terraform resources to establish a VPN connection could be an extension of this project.


The thick green links on the diagram represents the authorized traffic through the gateway.



  • Change ACCESS_KEY and SECRET_KEY values in Variables.tf
  • Change the public_key value to a keypair you own
  • Deploy the setup with:
$ terraform init $ terraform plan $ terraform apply
  • The public IP of the instance in the 'shared' VPC is printed when deployment ends
  • ssh on this instance
$ ssh -i your_private_key [email protected]$PUBLIC_IP
  • Check you can ping and ssh any other instance in the other VPCs
  • Also check that, from a dev instance (1 & 2) you cannot reach the prod instance (4) and vice-versa.
  • Delete all resources
Sours: https://github.com/mikemowgli/terraform-aws-transit-gateway
How to set up AWS Transit Gateway, Gateway Attachments, VPC Route Tables, \u0026 TGW peering btw regions

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Aws gateway terraform transit

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Interconnecting Amazon VPCs across AWS Regions using AWS Transit Gateway - Demo

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