Use UpdateAlias with a CLI

To update a function alias

The following update-alias example updates the alias named LIVE to point to version 3 of the my-function Lambda function.

aws lambda update-alias \
    --function-name my-function \
    --function-version 3 \
    --name LIVE

Output:

{
    "FunctionVersion": "3",
    "Name": "LIVE",
    "AliasArn": "arn:aws:lambda:us-west-2:123456789012:function:my-function:LIVE",
    "RevisionId": "594f41fb-b85f-4c20-95c7-6ca5f2a92c93",
    "Description": "alias for live version of function"
}

For more information, see Configuring Amazon Lambda Function Aliases in the Amazon Lambda Developer Guide.

Example 1: This example updates the Configuration of an existing Lambda function Alias. It updates the RoutingConfiguration value to shift 60% (0.6) of traffic to version 1

Update-LMAlias -FunctionName "MylambdaFunction123" -Description " Alias for version 2" -FunctionVersion 2 -Name "newlabel1" -RoutingConfig_AdditionalVersionWeight @{Name="1";Value="0.6}