Cleanup/Delete Transit-Gateway and Transit-Gateway-attachments

Am pasting my notes on cleaning up Transit-Gateway and Transit-gateway attachments, this is readily available on AWS documentation but thought I will paste it here if anyone wants to quickly copy and paste the steps instead of going through the documentation. We can be more sophisticated using Python / Ansible / Terraform and parse the outputs for now this is what I did to clean up some practise, do not forget this as it incurred good cost for but got saved by AWS credits!

1. list out available transit-gateway attachments as they are to be deleted first before deleting transit-gateway

aws ec2 describe-transit-gateway-attachments --region us-east-1 | egrep -i TransitGatewayAttachmentI -> This will list out TGW attachments in us-east-1

➜  ~ aws ec2 describe-transit-gateway-attachments --region us-east-1 | egrep -i TransitGatewayAttachmentId
            "TransitGatewayAttachmentId": "tgw-attach-01b7c8d7d3bd4e2ca",
            "TransitGatewayAttachmentId": "tgw-attach-050c87ef9fb703c98",
            "TransitGatewayAttachmentId": "tgw-attach-079921a8810f490ab",

2. Delete the available attachments

aws ec2 delete-transit-gateway-vpc-attachment \
    --transit-gateway-attachment-id tgw-attach-01b7c8d7d3bd4e2ca --region us-east-1

aws ec2 delete-transit-gateway-vpc-attachment \
    --transit-gateway-attachment-id tgw-attach-050c87ef9fb703c98 --region us-east-1

aws ec2 delete-transit-gateway-vpc-attachment \
    --transit-gateway-attachment-id tgw-attach-079921a8810f490ab --region us-east-1

3. ➜  List…