AWS Lambda - Update Environment

This module performs bulk operations on environment variables of AWS Lambda functions.

The problem

AWS CLI allows you to update your lambda function's configuration with the following command:

aws lambda update-function-configuration --function-name <function> --environment <env-as-json>

Unfortunately this command replaces the whole environemnt with the newly provided, making it impossible to update just one env variable.

Requirements

You need to configure your AWS credentials in ~/.aws/credentials and your region in ~/.aws/configuration

More on that here : https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html

Installation

Using NPM

npm install -g aws-lambda-update-env

Usage

update-lambda-env <ENV_VAR_KEY> <ENV_VAR_VALUE> --stack-name <STACK_NAME>

Where:

• ENV_VAR_KEY is the name of the environment variable you wish to update on all lambdas inside your stack that have it.
• ENV_VAR_VALUE is the new value for the environment variable you wish to change
• STACK_NAME is the CloudFormation stack name on which you wish to operate

Example:

update-lambda-env KEY "My New Test Value" --stack-name myApplicationStack

Result:

How it works

The update-lambda-env module will do the following:

1. Read your stack and list all the resources which are of type AWS::Lambda::Function
2. Load the environment variables of your lambda functions
3. Check if the env variables contain the one you wish to update and filter those which do not
4. Prompt you if it's ok to execute the change
5. Run aws update-function-configuration --environment