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Lambda Function Concurrent Execution Limit Configured Rule

This rule ensures that the concurrent execution limit for Lambda functions is configured properly.

RuleLambda functions concurrent execution limit configured
FrameworkFedRAMP Low Revision 4
Severity
Low

Rule Description:

The Lambda Functions Concurrent Execution Limit rule sets the maximum number of concurrent executions allowed for Lambda functions deployed in an AWS account that is configured for FedRAMP Low Revision 4 compliance. FedRAMP (Federal Risk and Authorization Management Program) is a government-wide program that provides a standardized approach to security assessment, authorization, and continuous monitoring for cloud products and services.

Troubleshooting Steps:

In case you encounter issues related to the Concurrent Execution Limit for Lambda functions, you can follow these troubleshooting steps:

  1. 1.

    Review Error Messages: If you receive error messages indicating that the number of concurrent executions has exceeded the limit, take note of the specific error messages received. These error messages may provide insight into the cause of the issue.

  2. 2.

    Check Concurrent Execution Limit: Verify the configured Concurrent Execution Limit for Lambda functions in your AWS account. You can check this limit by following these steps:

    • Log in to the AWS Management Console.
    • Open the AWS Lambda service console.
    • Select the relevant region.
    • Click on "Functions" in the left navigation menu.
    • Locate the Lambda function in question and click on its name.
    • In the "Configuration" tab, check the value specified for "Concurrent executions".
  3. 3.

    Increase the Concurrent Execution Limit: If the current Concurrent Execution Limit is lower than what is required, you can request an increase from AWS Support. Provide the necessary information, including the reason for the increase and the expected concurrent execution requirement.

Necessary Codes:

There are no specific codes related to this rule. However, if you want to adjust the Concurrent Execution Limit programmatically, you can use the

update-function-configuration
command in the AWS Command Line Interface (CLI) or SDKs like Boto3 for Python. This command can be used to modify various configuration aspects of a Lambda function, including the Concurrent Execution Limit.

Step-by-Step Guide for Remediation:

To ensure compliance with the Lambda Functions Concurrent Execution Limit rule for FedRAMP Low Revision 4, follow these steps:

  1. 1.

    Identify the Lambda function: Determine the Lambda function for which you need to modify the Concurrent Execution Limit.

  2. 2.

    Access the AWS Management Console: Log in to the AWS Management Console using valid credentials.

  3. 3.

    Open the Lambda Service Console: Navigate to the AWS Lambda service console by searching for "Lambda" in the AWS Management Console search bar and selecting the result.

  4. 4.

    Select the appropriate region: Ensure that you have selected the AWS region where the Lambda function is deployed. Some operations are region-specific.

  5. 5.

    Locate the Lambda function: Click on the "Functions" option located in the left-hand menu to access the list of Lambda functions in the selected region.

  6. 6.

    Choose the Lambda function: Scroll through the list and select the Lambda function that needs its Concurrent Execution Limit adjusted.

  7. 7.

    Open the Configuration tab: Once you have selected the function, click on its name to access the function details. From the function details page, choose the "Configuration" tab.

  8. 8.

    Modify the Concurrent Execution Limit: In the "Concurrent executions" section, update the value according to the desired Concurrent Execution Limit required for compliance. Ensure that the new value aligns with the limits set for FedRAMP Low Revision 4.

  9. 9.

    Save the changes: Click on the "Save" button to apply the new Concurrent Execution Limit for the Lambda function.

  10. 10.

    Verify the change: Confirm that the Concurrent Execution Limit has been successfully updated by checking the updated value in the Lambda function's configuration details.

By following these steps, you can adjust the Concurrent Execution Limit for Lambda functions deployed in an account configured for FedRAMP Low Revision 4 in line with compliance requirements.

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