Step 1: Create a test listener - Amazon CodeDeploy
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Step 1: Create a test listener

An Amazon ECS deployment with validation tests requires a second listener. This listener is used to serve test traffic to your updated Amazon ECS application in a replacement task set. Your validation tests run against the test traffic.

The listener for your test traffic can use either of your target groups. Use the create-listener Amazon CLI command to create a second listener with a default rule that forwards test traffic to port 8080. Use the ARN of your load balancer and the ARN of one of your target groups.

aws elbv2 create-listener --load-balancer-arn your-load-balancer-arn \
--protocol HTTP --port 8080 \
--default-actions Type=forward,TargetGroupArn=your-target-group-arn --region your-aws-region