Request Syntax URI Request Parameters Request Body Response Syntax Response Elements Errors See Also

PutFunctionScalingConfig

Sets the scaling configuration for a Lambda Managed Instances function. The scaling configuration defines the minimum and maximum number of execution environments that can be provisioned for the function, allowing you to control scaling behavior and resource allocation.

Request Syntax


PUT /2025-11-30/functions/FunctionName/function-scaling-config?Qualifier=Qualifier HTTP/1.1
Content-type: application/json

{
   "FunctionScalingConfig": { 
      "MaxExecutionEnvironments": number,
      "MinExecutionEnvironments": number
   }
}

URI Request Parameters

The request uses the following URI parameters.

FunctionName

The name or ARN of the Lambda function.

Length Constraints: Minimum length of 1. Maximum length of 140.

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}((-gov)|(-iso([a-z]?)))?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)

Required: Yes

Qualifier

Specify a version or alias to set the scaling configuration for a published version of the function.

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: (\$LATEST\.PUBLISHED|[0-9]+)

Required: Yes

Request Body

The request accepts the following data in JSON format.

FunctionScalingConfig

The scaling configuration to apply to the function, including minimum and maximum execution environment limits.

Type: FunctionScalingConfig object

Required: No

Response Syntax


HTTP/1.1 202
Content-type: application/json

{
   "FunctionState": "string"
}

Response Elements

If the action is successful, the service sends back an HTTP 202 response.

The following data is returned in JSON format by the service.

FunctionState

The current state of the function after applying the scaling configuration.

Type: String

Errors

For information about the errors that are common to all actions, see Common Errors.

InvalidParameterValueException

One of the parameters in the request is not valid.

message: The exception message.
Type: The exception type.

HTTP Status Code: 400

ResourceConflictException

The resource already exists, or another operation is in progress.

message: The exception message.
Type: The exception type.

HTTP Status Code: 409

ResourceNotFoundException

The resource specified in the request does not exist.

HTTP Status Code: 404

ServiceException

The AWS Lambda service encountered an internal error.

HTTP Status Code: 500

TooManyRequestsException

The request throughput limit was exceeded. For more information, see Lambda quotas.

retryAfterSeconds: The number of seconds the caller should wait before retrying.

HTTP Status Code: 429