update_alias

update_alias(**kwargs)

Updates the configuration of a Lambda function alias.

See also: AWS API Documentation

Request Syntax

response = client.update_alias(
    FunctionName='string',
    Name='string',
    FunctionVersion='string',
    Description='string',
    RoutingConfig={
        'AdditionalVersionWeights': {
            'string': 123.0
        }
    },
    RevisionId='string'
)

Parameters

• FunctionName (string) --

  [REQUIRED]

  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.

• Name (string) --

  [REQUIRED]

  The name of the alias.

• FunctionVersion (string) -- The function version that the alias invokes.
• Description (string) -- A description of the alias.
• RoutingConfig (dict) --

  The routing configuration of the alias.

  • AdditionalVersionWeights (dict) --

    The second version, and the percentage of traffic that's routed to it.

    • (string) --
      • (float) --
• RevisionId (string) -- Only update the alias if the revision ID matches the ID that's specified. Use this option to avoid modifying an alias that has changed since you last read it.

Return type

dict

Returns

Response Syntax

{
    'AliasArn': 'string',
    'Name': 'string',
    'FunctionVersion': 'string',
    'Description': 'string',
    'RoutingConfig': {
        'AdditionalVersionWeights': {
            'string': 123.0
        }
    },
    'RevisionId': 'string'
}

Response Structure

• (dict) --

  Provides configuration information about a Lambda function alias.

  • AliasArn (string) --

    The Amazon Resource Name (ARN) of the alias.

  • Name (string) --

    The name of the alias.

  • FunctionVersion (string) --

    The function version that the alias invokes.

  • Description (string) --

    A description of the alias.

  • RoutingConfig (dict) --

    The routing configuration of the alias.

    • AdditionalVersionWeights (dict) --

      The second version, and the percentage of traffic that's routed to it.

      • (string) --
        • (float) --

  • RevisionId (string) --

    A unique identifier that changes when you update the alias.

Exceptions

• Lambda.Client.exceptions.ServiceException
• Lambda.Client.exceptions.ResourceNotFoundException
• Lambda.Client.exceptions.InvalidParameterValueException
• Lambda.Client.exceptions.TooManyRequestsException
• Lambda.Client.exceptions.PreconditionFailedException
• Lambda.Client.exceptions.ResourceConflictException

Examples

The following example updates the alias named BLUE to send 30% of traffic to version 2 and 70% to version 1.

response = client.update_alias(
    FunctionName='my-function',
    FunctionVersion='2',
    Name='BLUE',
    RoutingConfig={
        'AdditionalVersionWeights': {
            '1': 0.7,
        },
    },
)

print(response)

Expected Output:

{
    'AliasArn': 'arn:aws:lambda:us-west-2:123456789012:function:my-function:BLUE',
    'Description': 'Production environment BLUE.',
    'FunctionVersion': '2',
    'Name': 'BLUE',
    'RevisionId': '594f41fb-xmpl-4c20-95c7-6ca5f2a92c93',
    'RoutingConfig': {
        'AdditionalVersionWeights': {
            '1': 0.7,
        },
    },
    'ResponseMetadata': {
        '...': '...',
    },
}