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Containers on AWS: ECS, EKS & Fargate

A clear separation of container orchestration and compute: Amazon ECS, Amazon EKS, EC2 capacity and AWS Fargate, with decision criteria for each layer.

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Visual overview

CONTAINER STACKChoose an orchestrator, then choose where the containers receive compute
ORCHESTRATIONAmazon ECSAWS-native container orchestration
ORCHESTRATIONAmazon EKSManaged Kubernetes on AWS
COMPUTEAWS FargateServerless compute for supported ECS/EKS workloads
ECS + EC2You manage cluster instances
ECS + FargateAWS manages server capacity
EKSKubernetes with multiple compute choices
ECS and EKS answer how containers are orchestrated. Fargate answers where supported containers run without requiring you to manage the underlying server fleet.
AWS SERVICE MAPOrchestrator and capacity are separate choices

ECS/EKS orchestrate; Fargate can supply serverless container compute.

Amazon ECSAWS-native orchestration
Amazon EKSManaged Kubernetes
AWS FargateServerless capacity
EXAM-RELEVANT MECHANICS

Technical reference

Separate orchestrator from worker capacity.

Amazon ECSAWS-native orchestrator

Uses clusters, task definitions, tasks, and services.

Amazon EKSManaged Kubernetes

Kubernetes concepts such as pods and deployments remain relevant.

AWS FargateServerless container compute

Runs supported ECS/EKS workloads without customer-managed worker instances.

EC2 capacityCustomer-managed instances

More host control, but the instance fleet remains a customer responsibility.

Separate orchestration from compute

Containers package an application and its dependencies into portable runtime units, but a production container platform still needs two separate decisions: how workloads are orchestrated and where their compute capacity runs. Amazon ECS and Amazon EKS address orchestration. EC2 and AWS Fargate are major compute choices that can supply capacity underneath supported container workloads.

Keeping these layers separate prevents a common conceptual error: Fargate is not a replacement name for ECS. You can run ECS tasks on Fargate or on EC2-backed capacity. Amazon EKS can also run supported Kubernetes pods on Fargate or use other node options. The orchestrator handles desired workload state and scheduling; the compute layer supplies CPU and memory where those containers execute.

Amazon ECS

Amazon Elastic Container Service (Amazon ECS) is AWS's fully managed container orchestration service. You describe container workloads with constructs such as task definitions, tasks and services. ECS integrates closely with AWS identity, networking, load balancing, observability and deployment services, making it a straightforward choice when a team wants AWS-native orchestration without adopting Kubernetes APIs and ecosystem concepts.

With ECS on EC2, the customer has control over the EC2 instances that form cluster capacity and is responsible for operating that server layer. With ECS on Fargate, AWS provides right-sized container compute without requiring the customer to provision or scale EC2 clusters. This shifts operational work away from host management while preserving ECS as the orchestration control plane.

Amazon EKS

Amazon Elastic Kubernetes Service (Amazon EKS) is a managed Kubernetes service. AWS operates the managed Kubernetes control-plane infrastructure, while customers deploy workloads using Kubernetes APIs and ecosystem tools. EKS is attractive when Kubernetes compatibility, Kubernetes expertise, existing tooling or ecosystem portability is a requirement.

Managed control plane does not mean that every Kubernetes operational concern disappears. Workload configuration, cluster add-ons, network and security design, version strategy, observability and compute choices still matter. Teams should choose EKS because Kubernetes creates value for their workload and organization, not because it is inherently a more advanced version of ECS.

AWS Fargate

AWS Fargate provides on-demand, right-sized compute capacity for containers without requiring customers to provision, configure or scale groups of virtual machines. For supported ECS workloads, tasks request CPU and memory resources and Fargate supplies the underlying capacity. EKS can also schedule eligible pods onto Fargate through Fargate profiles.

Fargate reduces server and cluster-capacity management, but the customer still owns the container image, application configuration, workload permissions, network choices and application security. EC2 remains valuable when you need host-level control, specialized instance types, particular accelerators, custom agents, or fleet-level cost optimization that depends on managing the underlying nodes.

Key takeaways

  1. 01

    ECS is AWS-native container orchestration; EKS is managed Kubernetes.

  2. 02

    Fargate is a container compute technology, not a separate container orchestrator.

  3. 03

    EC2-backed containers provide more host control; Fargate removes the need to manage the server fleet.

  4. 04

    Choose ECS versus EKS based on orchestration requirements, then choose a compatible compute model based on control and operations.

Official AWS sources

Use these primary AWS resources for the source material behind this article and for deeper reference.