Question 1

terraform-aws-transit-gateway vs manually creating TGW resources

Accepted Answer

This module bundles multiple AWS resources into a single, reusable configuration, saving time and ensuring consistency. Manually creating each resource offers more control but increases boilerplate and potential for errors. For most teams, the module is preferred for standard deployments.

Question 2

how to attach multiple VPCs to transit gateway using this terraform module

Accepted Answer

Use the vpc_attachments input variable as a map of maps, where each key represents a VPC with details like vpc_id and subnet_ids. The module handles the creation of VPC attachments and associated routing, as shown in the usage example with multiple entries.

Question 3

what are the cost implications of using aws transit gateway with this module

Accepted Answer

The module itself doesn't manage costs, but Transit Gateway has per-hour charges and data processing fees. You need to account for TGW usage, VPC attachment costs, and data transfer, which should be monitored separately in AWS Cost Explorer.

Question 4

how to share a transit gateway with another aws account using this module

Accepted Answer

Set the share_tgw input to true and specify ram_principals with the account IDs. The module integrates with AWS Resource Access Manager (RAM) to create resource shares, as detailed in the multi-account example.

Question 5

best practices for managing transit gateway route tables with terraform

Accepted Answer

Define clear route table structures in the tgw_route_table inputs, use tags for organization, and enable default associations and propagations as needed. Regularly review and update routes to avoid blackholing or misconfigurations.

Question 6

how to handle errors when terraform transit gateway module fails

Accepted Answer

Check AWS service limits, ensure IAM permissions are correct, and validate input variables. Use Terraform's plan and state management tools to debug, and refer to the module's issues on GitHub for common problems.

terraform-aws-transit-gateway

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