lambda-function-settings-check

Checks if the AWS Lambda function settings for runtime, role, timeout, and memory size match the expected values. The rule ignores functions with the 'Image' package type and functions with runtime set to 'OS-only Runtime'. The rule is NON_COMPLIANT if the Lambda function settings do not match the expected values.

Identifier: LAMBDA_FUNCTION_SETTINGS_CHECK

Resource Types: AWS::Lambda::Function

Trigger type: Configuration changes

AWS Region: All supported AWS regions except Asia Pacific (Osaka), Europe (Spain), China (Ningxia) Region

Parameters:

runtime

Type: CSV

Comma-separated list of AWS Lambda runtime values

role (Optional)

Type: String

Name or ARN of the AWS Lambda execution role

timeout (Optional)

Type: int

Default: 3

AWS Lambda function timeout in seconds

memorySize (Optional)

Type: int

Default: 128

AWS Lambda function size in megabytes

Proactive Evaluation

For steps on how to run this rule in proactive mode, see Evaluating Your Resources with AWS Config Rules. For this rule to return COMPLIANT in proactive mode, the resource configuration schema for the StartResourceEvaluation API needs to include the following inputs, encoded as a string:

"ResourceConfiguration":
...
{
    "MemorySize": Integer*,
    "Role": String*,
    "Runtime": String*,
    "Timeout": Integer*
} 
...

^*For more information on valid values for these inputs, see MemorySize, Role, Runtime, and Timeout in the AWS CloudFormation User Guide.

For more information on proactive evaluation, see Evaluation Mode.

AWS CloudFormation template

To create AWS Config managed rules with AWS CloudFormation templates, see Creating AWS Config Managed Rules With AWS CloudFormation Templates.