Amazon ECS-optimized Linux 2 AMIs now come with pre-installed AWS Systems Manager Agent
Amazon ECS Optimized Linux 2 Amazon Machine Images(AMI) now come with the AWS System Manager (SSM) Agent pre-installed. The SSM Agent makes it possible for Systems Manager to update, manage, and configure EC2 instances in a customer’s ECS cluster. ECS customers that used to manually install the SSM agent into thier ECS optimized AMI will now get these features out of the box.
Source:: Amazon AWS