Rule: Lambda Functions Concurrent Execution Limit Configured
This rule ensures the concurrent execution limit is configured for Lambda functions.
| Rule | Lambda functions concurrent execution limit configured |
| Framework | FedRAMP Moderate Revision 4 |
| Severity | ✔ Low |
Concurrent Execution Limit for Lambda Functions
Description
The concurrent execution limit for Lambda functions is a configuration setting that specifies the maximum number of concurrent executions allowed for a Lambda function in the context of a FedRAMP Moderate Revision 4 environment. This limit is enforced by the AWS Lambda service to ensure resource utilization and prevent potential performance issues.
Troubleshooting Steps (if applicable)
If you encounter issues related to the concurrent execution limit of Lambda functions, follow these troubleshooting steps:
- 1.Identify the error: Check the error message or logs associated with the Lambda function that indicate a failure due to reaching the concurrent execution limit.
- 2.Analyze function behavior: Monitor the function's behavior during peak usage periods to identify patterns and determine if the limit is consistently being reached.
- 3.Evaluate concurrent executions: Review the current concurrent execution limit set for the Lambda function.
- 4.Adjust the limit: If necessary, consider increasing the concurrent execution limit for the Lambda function to alleviate potential bottlenecks.
- 5.Optimize function performance: Optimize the function code and AWS resources used by the function to improve execution efficiency and minimize the risk of reaching the concurrent execution limit.
Necessary Code (if applicable)
Modifying the concurrent execution limit for a Lambda function can be done using the AWS Management Console or the AWS Command Line Interface (CLI). Below is an example of how to use the CLI to modify the limit.
# Set concurrency limit for a Lambda function aws lambda put-function-concurrency \ --function-name <function-name> \ --reserved-concurrent-executions <concurrency-limit>
Step-by-Step Guide for Remediating the Issue
- 1.
Access AWS Management Console: Log in to the AWS Management Console with your credentials.
- 2.
Navigate to Lambda service: Go to the Lambda service by searching for "Lambda" in the search bar and selecting it.
- 3.
Select the Lambda function: Choose the relevant Lambda function from the list of functions displayed.
- 4.
View current concurrency limit: In the function details page, scroll down to the "Concurrency" section to view the current concurrency limit.
- 5.
Modify the limit (if required): If you determine that the current limit needs adjustment, follow the necessary code mentioned above to modify the concurrent execution limit using the AWS CLI.
- 6.
Test and monitor: After modifying the limit, test the Lambda function under workload conditions and monitor its behavior to ensure the revised limit mitigates the issue.
- 7.
Optimize function performance (if needed): If the issue persists or reoccurs, consider optimizing the function code and AWS resources used by the function to reduce the overall resource consumption and enhance performance.
- 8.
Repeat as necessary: Repeat this process for other Lambda functions if multiple functions are affected by the concurrent execution limit.
Note: Keep in mind that the concurrent execution limit should be set based on the available resources and the expected workload demand for each Lambda function. It is essential to strike a balance to ensure optimal performance while avoiding resource exhaustion.
By following these steps, you can effectively manage the concurrent execution limit for Lambda functions within the FedRAMP Moderate Revision 4 environment.