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README.md

Triggering Lambda With ALB

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 “501-Triggering-Lambda-With-ALB/cdk-AWS-Cookbook-501” directory and follow the subsequent steps:

cd 501-Triggering-Lambda-With-ALB/cdk-AWS-Cookbook-501/
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 a modified environment variable from the output:

PUBLIC_SUBNETS=$(echo ${PUBLIC_SUBNETS} | tr -d ',"')

Navigate up to the main directory for this recipe (out of the “cdk-AWS-Cookbook-501” directory):

cd ..

Clean up

Delete the listener rule:

aws elbv2 delete-rule --rule-arn $RULE_ARN

Delete the target group:

aws elbv2 delete-target-group --target-group-arn $TARGET_GROUP_ARN

Delete the Lambda function:

aws lambda delete-function --function-name AWSCookbook501Lambda

Delete the Lambda CloudWatch log group:

aws logs delete-log-group \
--log-group-name /aws/lambda/AWSCookbook501Lambda

Go to the cdk-AWS-Cookbook-501 directory:

cd cdk-AWS-Cookbook-501/

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 LAMBDA_ARN
unset RULE_ARN
unset TARGET_GROUP_ARN

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 ../..