Run multiple Docker containers on the same machine with easy service discovery (networking) and ELB+ASG. can run batch or scheduled tasks - easy to migrate to the cloud.
ECS Cluster - logical collection of EC2 instances
ECS Service - defines how many tasks run and how
Task definitions - metadata (JSON) to tell ECS how to run the container
ECS task - an instance of a task definition - a running container
ECS IAM roles: ec2InstanceProfile (API calls from EC2) ecstaskrole (API to s3)
create EC2 instance role with minimum permissions to ECS
create IAM task role for each service and reference the task definition
supports Dynamic Port Mapping working with ALB to run multiple apps on the same EC2 for better durability and maximize CPU utilization
Run containers in Hybrid architecture with ECS control plane by defining an “External” launch type - use Direct connect (compliance, latency )
Launch docker without managing the infra - just create task definition and specify CPU
Service auto scaling - target / step / scheduled
can inject data from SSM parameter store and secrets manager