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Configuration

PDFRSS

For configuration management, use environment variables for infrequent changes, such as logging level and database connection strings. Use AWS Systems Manager Parameter Store (SSM) or AWS AppConfig for dynamic configuration, such as feature toggles. Store sensitive data using AWS Secrets Manager. In Lambda functions, lookup values by reference from these external systems (SSM, AWS AppConfig, Secrets Manager) in the function’s global scope outside the handler to reduce API calls. You can achieve the same goal of reducing API calls to configuration and secrets stores using Lambda extensions which provide more fine-grained controls and the ability to re-fetch values. Lambda extensions are powerful and flexible yet bring additional considerations and challenges including integrations with unit tests and consistent delivery across functions and runtimes. Lambda Powertools offer similar functionality to retrieve values from various providers including SSM, AWS AppConfig, Secrets Manager, DynamoDB or custom stores.