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UpdateFunctionConfiguration

Updates the configuration parameters for the specified Lambda function by using the values provided in the request. You provide only the parameters you want to change. This operation must only be used on an existing Lambda function and cannot be used to update the function's code.

If you are using the versioning feature, note this API will always update the $LATEST version of your Lambda function. For information about the versioning feature, see AWS Lambda Function Versioning and Aliases.

This operation requires permission for the lambda:UpdateFunctionConfiguration action.

Request Syntax

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PUT /2015-03-31/functions/FunctionName/configuration HTTP/1.1 Content-type: application/json { "DeadLetterConfig": { "TargetArn": "string" }, "Description": "string", "Environment": { "Variables": { "string" : "string" } }, "Handler": "string", "KMSKeyArn": "string", "MemorySize": number, "Role": "string", "Runtime": "string", "Timeout": number, "TracingConfig": { "Mode": "string" }, "VpcConfig": { "SecurityGroupIds": [ "string" ], "SubnetIds": [ "string" ] } }

URI Request Parameters

The request requires the following URI parameters.

FunctionName

The name of the Lambda function.

You can specify a function name (for example, Thumbnail) or you can specify Amazon Resource Name (ARN) of the function (for example, arn:aws:lambda:us-west-2:account-id:function:ThumbNail). AWS Lambda also allows you to specify a partial ARN (for example, account-id:Thumbnail). Note that the length constraint applies only to the ARN. If you specify only the function name, it is limited to 64 character in length.

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

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

Request Body

The request accepts the following data in JSON format.

DeadLetterConfig

The parent object that contains the target ARN (Amazon Resource Name) of an Amazon SQS queue or Amazon SNS topic.

Type: DeadLetterConfig object

Required: No

Description

A short user-defined function description. AWS Lambda does not use this value. Assign a meaningful description as you see fit.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.

Required: No

Environment

The parent object that contains your environment's configuration settings.

Type: Environment object

Required: No

Handler

The function that Lambda calls to begin executing your function. For Node.js, it is the module-name.export value in your function.

Type: String

Length Constraints: Maximum length of 128.

Pattern: [^\s]+

Required: No

KMSKeyArn

The Amazon Resource Name (ARN) of the KMS key used to encrypt your function's environment variables. If you elect to use the AWS Lambda default service key, pass in an empty string ("") for this parameter.

Type: String

Pattern: (arn:aws:[a-z0-9-.]+:.*)|()

Required: No

MemorySize

The amount of memory, in MB, your Lambda function is given. AWS Lambda uses this memory size to infer the amount of CPU allocated to your function. Your function use-case determines your CPU and memory requirements. For example, a database operation might need less memory compared to an image processing function. The default value is 128 MB. The value must be a multiple of 64 MB.

Type: Integer

Valid Range: Minimum value of 128. Maximum value of 1536.

Required: No

Role

The Amazon Resource Name (ARN) of the IAM role that Lambda will assume when it executes your function.

Type: String

Pattern: arn:aws:iam::\d{12}:role/?[a-zA-Z_0-9+=,.@\-_/]+

Required: No

Runtime

The runtime environment for the Lambda function.

To use the Python runtime v3.6, set the value to "python3.6". To use the Python runtime v2.7, set the value to "python2.7". To use the Node.js runtime v6.10, set the value to "nodejs6.10". To use the Node.js runtime v4.3, set the value to "nodejs4.3". To use the Python runtime v3.6, set the value to "python3.6". To use the Python runtime v2.7, set the value to "python2.7".

Note

You can no longer downgrade to the v0.10.42 runtime version. This version will no longer be supported as of early 2017.

Type: String

Valid Values: nodejs | nodejs4.3 | nodejs6.10 | java8 | python2.7 | python3.6 | dotnetcore1.0 | nodejs4.3-edge

Required: No

Timeout

The function execution time at which AWS Lambda should terminate the function. Because the execution time has cost implications, we recommend you set this value based on your expected execution time. The default is 3 seconds.

Type: Integer

Valid Range: Minimum value of 1.

Required: No

TracingConfig

The parent object that contains your function's tracing settings.

Type: TracingConfig object

Required: No

VpcConfig

If your Lambda function accesses resources in a VPC, you provide this parameter identifying the list of security group IDs and subnet IDs. These must belong to the same VPC. You must provide at least one security group and one subnet ID.

Type: VpcConfig object

Required: No

Response Syntax

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HTTP/1.1 200 Content-type: application/json { "CodeSha256": "string", "CodeSize": number, "DeadLetterConfig": { "TargetArn": "string" }, "Description": "string", "Environment": { "Error": { "ErrorCode": "string", "Message": "string" }, "Variables": { "string" : "string" } }, "FunctionArn": "string", "FunctionName": "string", "Handler": "string", "KMSKeyArn": "string", "LastModified": "string", "MemorySize": number, "Role": "string", "Runtime": "string", "Timeout": number, "TracingConfig": { "Mode": "string" }, "Version": "string", "VpcConfig": { "SecurityGroupIds": [ "string" ], "SubnetIds": [ "string" ], "VpcId": "string" } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

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

CodeSha256

It is the SHA256 hash of your function deployment package.

Type: String

CodeSize

The size, in bytes, of the function .zip file you uploaded.

Type: Long

DeadLetterConfig

The parent object that contains the target ARN (Amazon Resource Name) of an Amazon SQS queue or Amazon SNS topic.

Type: DeadLetterConfig object

Description

The user-provided description.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.

Environment

The parent object that contains your environment's configuration settings.

Type: EnvironmentResponse object

FunctionArn

The Amazon Resource Name (ARN) assigned to the function.

Type: String

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

FunctionName

The name of the function. Note that the length constraint applies only to the ARN. If you specify only the function name, it is limited to 64 characters in length.

Type: String

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

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

Handler

The function Lambda calls to begin executing your function.

Type: String

Length Constraints: Maximum length of 128.

Pattern: [^\s]+

KMSKeyArn

The Amazon Resource Name (ARN) of the KMS key used to encrypt your function's environment variables. If empty, it means you are using the AWS Lambda default service key.

Type: String

Pattern: (arn:aws:[a-z0-9-.]+:.*)|()

LastModified

The time stamp of the last time you updated the function.

Type: String

MemorySize

The memory size, in MB, you configured for the function. Must be a multiple of 64 MB.

Type: Integer

Valid Range: Minimum value of 128. Maximum value of 1536.

Role

The Amazon Resource Name (ARN) of the IAM role that Lambda assumes when it executes your function to access any other Amazon Web Services (AWS) resources.

Type: String

Pattern: arn:aws:iam::\d{12}:role/?[a-zA-Z_0-9+=,.@\-_/]+

Runtime

The runtime environment for the Lambda function.

Type: String

Valid Values: nodejs | nodejs4.3 | nodejs6.10 | java8 | python2.7 | python3.6 | dotnetcore1.0 | nodejs4.3-edge

Timeout

The function execution time at which Lambda should terminate the function. Because the execution time has cost implications, we recommend you set this value based on your expected execution time. The default is 3 seconds.

Type: Integer

Valid Range: Minimum value of 1.

TracingConfig

The parent object that contains your function's tracing settings.

Type: TracingConfigResponse object

Version

The version of the Lambda function.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

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

VpcConfig

VPC configuration associated with your Lambda function.

Type: VpcConfigResponse object

Errors

InvalidParameterValueException

One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda to assume in the CreateFunction or the UpdateFunctionConfiguration API, that AWS Lambda is unable to assume you will get this exception.

HTTP Status Code: 400

ResourceNotFoundException

The resource (for example, a Lambda function or access policy statement) 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

HTTP Status Code: 429

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: