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README.md

Using a NAT Gateway for Outbound Internet Access from Private Subnets

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 “204-Using-A-Nat-Gateway/cdk-AWS-Cookbook-204” directory and follow the subsequent steps:

cd 204-Using-A-Nat-Gateway/cdk-AWS-Cookbook-204/
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

Clean up

Delete the NAT gateway that you created (this may take up to 1 minute to delete):

aws ec2 delete-nat-gateway --nat-gateway-id $NAT_GATEWAY_ID

Wait until the NAT gateway has reached the “deleted” state:

aws ec2 describe-nat-gateways --nat-gateway-id $NAT_GATEWAY_ID \
    --output text --query NatGateways[0].State

Release the Elastic IP address that you created:

aws ec2 release-address --allocation-id $ALLOCATION_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 the environment variable that you created manually:

unset ALLOCATION_ID
unset NAT_GATEWAY_ID

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 ../..