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README.md

Enabling Transitive Cross-VPC Connections Using Transit Gateway

Preparation

This recipe requires some “prep work” which deploys resources that you’ll build the solution on. You will use the AWS CDK to deploy these resources

In the root of this Chapter’s repo cd to the “210-Using-a-Transit-Gateway/cdk-AWS-Cookbook-210” directory and follow the subsequent steps:

cd 210-Using-a-Transit-Gateway/cdk-AWS-Cookbook-210
test -d .venv || python3 -m venv .venv
source .venv/bin/activate
pip install --upgrade pip
pip install -r requirements.txt
cdk deploy

Wait for the cdk deploy command to complete.

We created a helper.py script to let you easily create and export environment variables to make subsequent commands easier. Run the script, and copy the output to your terminal to export variables:

python helper.py

For this recipe, you will need to create some modified environment variables to use:

ATTACHMENT_SUBNETS_VPC_1=$(echo ${ATTACHMENT_SUBNETS_VPC_1} | tr -d ',"')
ATTACHMENT_SUBNETS_VPC_2=$(echo ${ATTACHMENT_SUBNETS_VPC_2} | tr -d ',"')
ATTACHMENT_SUBNETS_VPC_3=$(echo ${ATTACHMENT_SUBNETS_VPC_3} | tr -d ',"')

Clean up

Delete the Transit Gateway attachments. These take a moment to delete.

aws ec2 delete-transit-gateway-vpc-attachment \
--transit-gateway-attachment-id $TGW_ATTACH_1

aws ec2 delete-transit-gateway-vpc-attachment \
--transit-gateway-attachment-id $TGW_ATTACH_2

aws ec2 delete-transit-gateway-vpc-attachment \
--transit-gateway-attachment-id $TGW_ATTACH_3

After the Transit Gateway attachments have been deleted, delete the Transit Gateway

aws ec2 delete-transit-gateway --transit-gateway-id $TGW_ID

To clean up the environment variables, run the helper.py script in this recipe’s cdk- directory with the --unset flag, and copy the output to your terminal to export variables:

python helper.py --unset

Unset your manually created environment variables

unset TRAN_GW_RT
unset TGW_ID
unset ATTACHMENT_SUBNETS_VPC_1
unset ATTACHMENT_SUBNETS_VPC_2
unset ATTACHMENT_SUBNETS_VPC_3
unset NAT_GW_ID_1
unset NAT_GW_ID_2

Use the AWS CDK to destroy the resources, deactivate your Python virtual environment, and go to the root of the chapter:

cdk destroy && deactivate && rm -r .venv/ && cd ../..