How can this requirement be met?
Store the connection string as a secret in AWS Secrets Manager.
Store the connection string in an IAM user account.
Store the connection string in AWS KMS.
Store the connection string as a Lambda layer.
Explanations:
AWS Secrets Manager is designed to store sensitive information, such as database connection strings, securely. It allows the connection string to be easily retrieved and updated without modifying the Lambda code.
Storing the connection string in an IAM user account is not appropriate. IAM users are intended for managing permissions and not for storing sensitive application data like connection strings.
AWS KMS (Key Management Service) is used for encrypting and managing encryption keys. It is not designed for storing sensitive application data like database connection strings.
Lambda layers are used for sharing libraries, dependencies, or runtime components across Lambda functions. It is not suitable for storing dynamic values like a database connection string that needs to be updated frequently.
As far as I can tell, the answer is:
Store the connection string as a secret in AWS Secrets Manager.