Traffic shifting with Lambda Alias

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Traffic Shifting Using an Alias (CLI)

To configure an alias to shift traffic between two function versions based on weights. 
Here is an example that points an alias to two different Lambda function versions, starting with version 1 receiving 90% and version 2 receiving 10%

> aws lambda create-alias --name myalias --function-name myfunction --function-version 1 --routing-config AdditionalVersionWeights={"2"=0.1}

Then you can update the percentage of incoming traffic to version 2, here to 15%.

> aws lambda update-alias --name myalias --function-name myfunction --routing-config AdditionalVersionWeights={"2"=0.15}

Eventually, after several cycle of incremental increase, you can route all traffic to version 2 by changing the function-version property to point to version 2 and set the routing-config parameter to an empty string, as shown following.

> aws lambda update-alias --name myalias --function-name myfunction --function-version 2 --routing-config ''