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# Verify each of these instances are running correctly and responding to checks.
# Add the new instances to the ELB while removing the old (with connection draining).
V# Verify that everything is working properly. If not swap old back in for the new and diagnose the problem. If so, delete the old instances."

* Src: https://blog.codeship.com/zero-downtime-deployment-with-aws-ecs-and-elb/

* See also https://blog.codeship.com/easy-blue-green-deployments-on-amazon-ec2-container-service/