Understanding ECS life cycle management

As described in the introduction to this chapter, ECS life cycle management refers to the process of taking existing ECS container instances out of service without impacting end users that may be connected to applications running on your affect instances. 

This requires you to leverage two key features provided by AWS:

• EC2 Auto Scaling life cycle hooks
• ECS container instance draining

EC2 Auto Scaling life cycle hooks

EC2 Auto Scaling life cycle hooks allow you to receive notice of a pending life cycle event and perform some action before the event takes place. Currently, you can be notified of the following life cycle hook events:

• EC2_INSTANCE_LAUNCHING: Raised when an EC2 instance...