Rule: Lambda Functions Concurrent Execution Limit Configured
This rule ensures Lambda functions have a configured concurrent execution limit in place.
| Rule | Lambda functions concurrent execution limit configured |
| Framework | NIST 800-53 Revision 5 |
| Severity | ✔ Low |
Understanding Lambda Functions Concurrent Execution Limit for NIST 800-53 Revision 5
AWS Lambda is a serverless computing service that runs code in response to events and automatically manages the underlying compute resources. Ensuring that Lambda functions comply with the standards and guidelines outlined in NIST 800-53 Revision 5 is essential for maintaining the security and reliability of cloud-based systems. One aspect of this compliance is managing the concurrent execution limit of Lambda functions.
What is AWS Lambda Concurrent Execution Limit?
Concurrent executions refer to the number of instances of your Lambda function that are processing events at the same time. AWS imposes a default concurrent execution limit per AWS account per region, which can affect the performance and scalability of your Lambda functions.
Rule Details: NIST 800-53 Control
The National Institute of Standards and Technology (NIST) outlines security and privacy controls for all U.S. federal information systems except those related to national security in NIST 800-53. The concurrent execution limit can be tied to several controls within NIST 800-53 Revision 5 that deal with system and communications protection (SC), configuration management (CM), and more. Compliance ensures that the systems are robust against threats and cannot be easily compromised.
Troubleshooting Steps
If you encounter issues with AWS Lambda's concurrent execution limit, follow these troubleshooting steps:
1. Check Limits
Determine if the functions are being throttled due to reaching the AWS-imposed concurrent execution limit.
2. Function Analysis
Examine your Lambda function’s logs and metrics in Amazon CloudWatch to ensure that the function’s runtime and execution are within expected parameters.
3. Increase Limits
If necessary, file a limit increase request through AWS Support to handle higher throughput.
4. Reservation of Concurrency
Optionally, set a reserved concurrency limit for critical functions to ensure they have the necessary resources.
5. Use Dead Letter Queues
For asynchronous invocation, make use of Dead Letter Queues (DLQ) to capture function errors.
Necessary Codes
Lambda provides configuration options that you can set as per your architectural needs. There are no direct codes for setting the concurrent limit, but AWS CLI commands and AWS Management Console can be used to manage concurrency.
Step by Step Guide for Remediation
Using AWS Console:
- 1.Go to the AWS Lambda console.
- 2.Choose the function you want to manage.
- 3.Click on the 'Configuration' tab.
- 4.Under 'Concurrency', choose 'Reserve concurrency' and set the number to the level you want.
Using AWS CLI:
To set the reserved concurrency for a specific function, use the following CLI command:
aws lambda put-function-concurrency --function-name my-function --reserved-concurrent-executions 100
To remove the reserved concurrency, allowing AWS to manage it automatically:
aws lambda delete-function-concurrency --function-name my-function
Monitoring and Compliance Verification
Regularly review your Lambda functions with help of AWS CloudTrail and AWS Config to ensure they adhere to the compliance requirements. Set up AWS Config rules to automatically check the compliance of your AWS resources, including Lambda concurrency configurations.
Remember, all CLI commands and configurations must follow the principle of least privilege, and any changes should be documented and approved following your organization’s governance and compliance protocols. For SEO optimization, it is crucial to include relevant keywords that are specific to AWS Lambda, NIST 800-53 Revision 5, concurrent executions, and cloud compliance within your content. However, focus on providing high-quality, informative content that adds real value to the reader, rather than aiming for keyword stuffing.