I have an application running in ECS with asg as the capacity provider and using code deploy for rolling out new images. the scaling policy configured in ECS service triggers autoscaling based on the cpu/mem metrics through cloud-watch alarms (target tracking policy).
When i trigger blue/green rollout in code deploy, there is a need for exactly the double the instances in the asg in order to accommodate the replacement version before routing the traffic. however at this point ASG wont trigger autoscale and hence code deploy will not get enough instances ready to get replacement version started.
i think there are few ways to achieve this (although not tried it) but I am looking for a simpler out of the box solution where i need not to maintain a lot of configuration
