Question

A development team deploys a Lambda function that processes financial transactions. They want new versions to receive 10% of production traffic for 5 minutes so they can monitor CloudWatch alarms before the remaining 90% is shifted. If an alarm triggers during the monitoring window, the deployment must automatically roll back. Which approach satisfies these requirements with the least custom code?

Accepted Answer

Use AWS CodeDeploy with a Lambda deployment configuration of Canary10Percent5Minutes, associate the deployment with a Lambda alias, and configure CloudWatch alarms in the deployment group for automatic rollback.

Answer

Publish a new Lambda version and manually update the alias weighting to 10% for 5 minutes, then run a script to shift the remaining traffic while polling CloudWatch metrics.

Answer

Use CodeDeploy with the LambdaAllAtOnce deployment configuration and enable automatic rollback on alarm to shift traffic gradually.

Answer

Configure API Gateway canary release settings on the production stage to send 10% of traffic to the new Lambda version for 5 minutes.