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README.md

Accessing VPC Resources with Lambda

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 “509-Accessing-VPC-Resources-with-Lambda/cdk-AWS-Cookbook-509” directory and follow the subsequent steps:

cd 509-Accessing-VPC-Resources-with-Lambda/cdk-AWS-Cookbook-509
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:

TRIMMED_ISOLATED_SUBNETS=$(echo ${ISOLATED_SUBNETS} | tr -d ' "')

We also need modify this variable to have the right format

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

Go up a directory.

cd ..

Clean up

Delete the Cache Cluster:

aws elasticache delete-cache-cluster \
    --cache-cluster-id "AWSCookbook509CacheCluster"

Delete the Cache Subnet Group:

aws elasticache delete-cache-subnet-group \
    --cache-subnet-group-name "AWSCookbook509CacheSG"

Delete the Lambda function:

aws lambda delete-function --function-name AWSCookbook509Lambda

Delete the Lambda CloudWatch log group:

aws logs delete-log-group \
--log-group-name /aws/lambda/AWSCookbook509Lambda

Detach the AWSLambdaBasicExecutionRole policy from the role:

aws iam detach-role-policy --role-name AWSCookbook509Lambda \
--policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

Delete the IAM Role:

aws iam delete-role --role-name AWSCookbook509Lambda

Delete the Lambda Security Group:

aws ec2 delete-security-group --group-id $LAMBDA_SG_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 LAMBDA_SG_ID
unset LAMBDA_ARN
unset SUBNET_IDS
unset TRIMMED_ISOLATED_SUBNETS

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 ../..