Why it matters

ECS is AWS container option. Understanding shapes container deployment choices.

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The architecture

Task definition: container spec.

Service: manages desired count of tasks.

Cluster: pool of compute (EC2 or Fargate).

ECS structureTask definitioncontainer specServicemanages replicasClustercompute poolFargate simpler; EC2 more control + can be cheaper at scale
ECS components.
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How it works end to end

Fargate: no infrastructure to manage; per-second billing.

EC2 launch: manage EC2 instances; cheaper at scale; more flexibility.

Service auto-scaling: scale tasks based on CPU/mem.

Integration: ALB, CloudWatch, IAM roles for tasks.