ECS

Managed container based service.
Why USE ECS?

• If you use containers, ECS.
• Large workload - price conscious, EC2 Mode.
• Large workload - overhead conscious, Fargate.
• Small / Burst workloads - Fargate
• Batch / Periodic workloads - Fargate

Has two modes EC2 and Fargate.
They provide clusterization.
ECR is like DockerHub.

Container definition points where the image is stored and what port it uses.
Task definition store all other information (task role, containers, resources…). May include many containers.
Task role, gives containers in ECS to access AWS products/services.
Service definition provide configuration for scalability and HA, how many copies.

ECS Modes

General info

ECS Management components
Scheduling and orchestration
Cluster manager
Placement engine
You use registries for container images

EC2 Mode

You and you pay for EC2 instances.
You manage container host (EC2 Instance), the capacity and availability.
Can use different EC2 Purchase Options

Fargate

You don’t manage EC2 instances
Instances run on a shared platform.
Tasks/Services are injected into you VPC
Capacity and availability is managed by AWS.
Pay per containers.

ECR

Relates to Container registry

AWS Elastic container registry.
Each account can have it’s registry, public or private.

It’s integrated with AWS IAM
Image scanning, basic/enhanced (inspector)
Near real-time metrics > CloudWatch
Event ≥ Event bridge
Replication-cross-region, cross account