AWS Lambda
开发人员指南

CreateAlias

Creates an alias for a Lambda function version. Use aliases to provide clients with a function identifier that you can update to invoke a different version.

You can also map an alias to split invocation requests between two versions. Use the RoutingConfig parameter to specify a second version and the percentage of invocation requests that it receives.

Request Syntax

POST /2015-03-31/functions/FunctionName/aliases HTTP/1.1 Content-type: application/json { "Description": "string", "FunctionVersion": "string", "Name": "string", "RoutingConfig": { "AdditionalVersionWeights": { "string" : number } } }

URI Request Parameters

The request requires the following URI parameters.

FunctionName

The name of the Lambda function.

Name formats

  • Function name - MyFunction.

  • Function ARN - arn:aws:lambda:us-west-2:123456789012:function:MyFunction.

  • Partial ARN - 123456789012:function:MyFunction.

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

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

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}(-gov)?-[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.

Description

A description of the alias.

Type: String

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

Required: No

FunctionVersion

The function version that the alias invokes.

Type: String

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

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

Required: Yes

Name

The name of the alias.

Type: String

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

Pattern: (?!^[0-9]+$)([a-zA-Z0-9-_]+)

Required: Yes

RoutingConfig

The routing configuration of the alias.

Type: AliasRoutingConfiguration object

Required: No

Response Syntax

HTTP/1.1 201 Content-type: application/json { "AliasArn": "string", "Description": "string", "FunctionVersion": "string", "Name": "string", "RevisionId": "string", "RoutingConfig": { "AdditionalVersionWeights": { "string" : number } } }

Response Elements

If the action is successful, the service sends back an HTTP 201 response.

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

AliasArn

The Amazon Resource Name (ARN) of the alias.

Type: String

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

Description

A description of the alias.

Type: String

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

FunctionVersion

The function version that the alias invokes.

Type: String

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

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

Name

The name of the alias.

Type: String

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

Pattern: (?!^[0-9]+$)([a-zA-Z0-9-_]+)

RevisionId

A unique identifier that changes when you update the alias.

Type: String

RoutingConfig

The routing configuration of the alias.

Type: AliasRoutingConfiguration 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

ResourceConflictException

The resource already exists.

HTTP Status Code: 409

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

Request throughput limit exceeded.

HTTP Status Code: 429

See Also

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