Best Practice for Passing Operational Parameters to Your AWS Lambda Function

Correct Answer - A.

For Lambda functions, Environment variables can be enabled to dynamically pass settings to function code and libraries without making changes to your code.

Environment variables are key-value pairs that are created as a part of function configuration.

Instead of hard coding the S3 bucket name in the Lambda function, it can pass as an environmental variable in the above requirement.

Option B is incorrect as Hard coding the S3 Bucket name in a Lambda function is not a best practice.

Option C is incorrect as Function Variables enable one or more Lambda functions to be published while environmental variables allow to pass settings to function codes dynamically.

In the above case, the S3 bucket name needs to be passed to function codes.

Option D is incorrect as this is not a correct way of passing the S3 bucket name to a Lambda function.

For more information on AWS Lambda Environment Variables, refer to the following URL-

https://docs.aws.amazon.com/lambda/latest/dg/best-practices.html

When writing to an S3 bucket from an AWS Lambda function, it is important to pass operational parameters, such as the bucket name, to your function in a secure and efficient manner. Here are the best practices for passing the bucket name to your Lambda function:

A. Configure Amazon S3 bucket name with AWS Lambda Environment Variables: This is the recommended approach for passing the bucket name to your Lambda function. You can define environment variables for your function that specify the bucket name. Environment variables are easy to manage and can be updated without modifying your code. Additionally, they are encrypted at rest and in transit, making them a secure way to pass sensitive information to your function.

B. Hard Code Amazon S3 bucket name to Lambda Function: This approach is not recommended as it makes your code less flexible and harder to maintain. Hardcoding the bucket name also makes it more difficult to test your code and could lead to errors if the bucket name needs to be changed.

C. Configure Amazon S3 bucket name with AWS Lambda Function Variables: This approach is similar to using environment variables, but function variables are not encrypted by default. While this approach is possible, it is not recommended as it is less secure than using environment variables.

D. Configure an Alias with Amazon S3 bucket name & pass it to Lambda Function: This approach is not recommended as aliases are intended for versioning and deployment of your Lambda function, not for passing operational parameters.

In summary, the best practice for passing operational parameters, such as the S3 bucket name, to your AWS Lambda function is to use environment variables.