You are launching the AWS ECS instance. You would like to set the ECS container agent configuration during the ECS instance launch. What should you do?

Answer options:

A.Set configuration in the ECS metadata parameter during cluster creation.
B.Set configuration in the user data parameter of EC2 instance.
C.Define configuration in the task definition.
D.Define configuration in the service definition.

Answer: B
When you launch an Amazon ECS container instance, you have the option of passing user data to the instance. The data can be used to perform common automated configuration tasks and even run scripts when the instance boots. For Amazon ECS, the most common use cases for user data are to pass configuration information to the Docker daemon and the Amazon ECS container agent.
Reference:
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/launch_container_instance.html
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/Welcome.html