Rule: Lambda functions should be configured with a dead-letter queue
This rule ensures Lambda functions have a dead-letter queue for error handling.
| Rule | Lambda functions should be configured with a dead-letter queue |
| Framework | FedRAMP Moderate Revision 4 |
| Severity | ✔ Medium |
Lambda Function Dead-Letter Queue Configuration for FedRAMP Moderate Revision 4
Description:
In order to comply with the FedRAMP Moderate Revision 4 security requirements, Lambda functions in your AWS environment should be configured with a dead-letter queue. A dead-letter queue helps in capturing and storing failed execution events or messages, providing an additional layer of error handling and troubleshooting capabilities for Lambda functions.
Troubleshooting Steps:
If you encounter any issues related to Lambda function execution failures or need to troubleshoot error handling, follow these steps:
- 1.
Verify Dead-Letter Queue Configuration:
- Check if the Lambda function is associated with a dead-letter queue.
- Ensure the dead-letter queue exists in the same AWS region as the Lambda function.
- 2.
Review the Dead-Letter Queue Settings:
- Ensure that the dead-letter queue has sufficient retention period to store failed messages for an appropriate duration.
- Confirm that the necessary permission policies are in place to allow Lambda to send messages to the dead-letter queue.
- 3.
Check Function Execution Logs:
- Analyze the CloudWatch Logs associated with the Lambda function to identify any specific error messages or execution failures.
- Use the logs to gain insight into the cause of the failures and define a remediation strategy if required.
Necessary Code:
To configure a dead-letter queue for a Lambda function, you need to modify the function's settings using the AWS Command Line Interface (CLI).
Here's an example of the CLI command to associate a dead-letter queue:
aws lambda update-function-configuration \ --function-name <function-name> \ --dead-letter-config TargetArn=<dead-letter-queue-ARN>
Replace
<function-name><dead-letter-queue-ARN>Step-by-Step Guide for Remediation:
To configure a dead-letter queue for a Lambda function, follow these steps:
- 1.
Open your AWS Command Line Interface (CLI) or use the AWS Management Console.
- 2.
Identify the Lambda function:
- If using the CLI, run the following command to list all your Lambda functions:
aws lambda list-functions - From the console, navigate to the Lambda service and identify the function you want to configure.
- 3.
Configure the Dead-Letter Queue:
- If using the CLI:
- Run the following command, replacing
and<function-name>
with appropriate values:<dead-letter-queue-ARN>aws lambda update-function-configuration \ --function-name <function-name> \ --dead-letter-config TargetArn=<dead-letter-queue-ARN>
- If using the console:
- Select the Lambda function.
- Scroll down to the "Dead letter queue" section in the configuration tab.
- Enable the option to "Enable active DLQ."
- Specify the ARN of the dead-letter queue you want to associate.
- 4.
Verify Configuration:
- Once the configuration is updated, ensure that the Lambda function is associated with the correct dead-letter queue.
- Test the Lambda function with sample inputs to validate the dead-letter queue functionality.
By following these steps and configuring the dead-letter queue, you will ensure compliance with the FedRAMP Moderate Revision 4 requirements for your Lambda functions.