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Cloud Fundamentals

EKS vs ECS - Choosing Your Container Platform

Learn when to choose Amazon EKS (Kubernetes) over ECS (AWS-native), understand Fargate's role with both, and recognize ECR as the container registry for both.

15 min
Intermediate

Learning outcomes

By the end of this lesson, the learner can:

  1. Explain when to choose EKS over ECS (and vice versa).
  2. Understand Fargate's role with both orchestrators.
  3. Recognize ECR as the container registry for both.

The container orchestration landscape on AWS

AWS offers two managed container orchestration services. Both run containers at scale, but they serve different needs:

  • Amazon ECS — AWS-native, simpler, deeply integrated with AWS services
  • Amazon EKS — Kubernetes-compatible, portable, ecosystem-rich

Both can run on Fargate (serverless) or EC2 (you manage the nodes). Both use ECR (Elastic Container Registry) to store images.

When to choose each service

ECS vs EKS Decision Framework

Choose ECS when...

  • You want AWS-native orchestration with deep service integration
  • Simplified operations and 'built-in best practices' appeal
  • Team is new to containers or AWS-focused

Choose EKS when...

  • You need Kubernetes API compatibility
  • Existing Kubernetes expertise and manifests
  • Multi-cloud or hybrid portability requirements

Key terms

Key Terms

Container Platform Services

EKS

AWS managed Kubernetes - portable, ecosystem-compatible

Example: Running same manifests on AWS and on-premises

ECS

AWS-native container orchestration - simpler, deeply integrated

Example: AWS service discovery, CloudWatch, ALB integration out-of-box

Fargate

Serverless compute engine for both ECS and EKS

Example: Run containers without managing EC2 worker nodes

ECR

Container registry for storing and versioning images

Example: Private Docker image storage with IAM-based access

Fargate works with both

Fargate is not tied to ECS or EKS specifically. It is a serverless compute engine that works with either orchestrator:

  • ECS on Fargate — Serverless containers with AWS-native orchestration
  • EKS on Fargate — Serverless containers with Kubernetes orchestration

The same Fargate benefits apply to both: no node management, pay per pod, automatic scaling.

ECR is the registry for both

Amazon ECR (Elastic Container Registry) stores container images for both ECS and EKS:

  • Push images to ECR from your CI/CD pipeline
  • Both ECS and EKS can pull from ECR
  • IAM controls access to repositories
  • Supports image scanning and lifecycle policies

Decision summary

FactorECSEKS
Learning curveGentlerSteeper (Kubernetes)
PortabilityAWS-onlyMulti-cloud / hybrid
EcosystemAWS servicesKubernetes ecosystem
Control planeAWS-managedKubernetes API
Best forAWS-centric teamsTeams wanting Kubernetes

Knowledge Check

Knowledge Check
1 / 4

Your team has existing Kubernetes manifests and wants to deploy to AWS with minimal changes. Which service?

Module 4.4 wrap-up

You now understand the container platform options on AWS:

  • ECS — AWS-native orchestration, simpler, deeply integrated
  • EKS — Kubernetes-compatible, portable, ecosystem-rich
  • Fargate — Serverless compute engine for both
  • ECR — Container registry for both

Next lesson

Lesson 4.22: Service Selection Practice