AWS ECS vs EKS in 2024: A Comprehensive Comparison

Choosing between Amazon Elastic Container Service (ECS) and Elastic Kubernetes Service (EKS) is a crucial decision for containerized applications. This guide compares both services to help you make an informed choice in 2024.

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``mermaid

graph TB

subgraph ECS["Amazon ECS"]

direction TB

EC["ECS Cluster"]

TD["Task Definition"]

SV["Service"]

CT["Container"]

end

subgraph EKS["Amazon EKS"]

direction TB

KC["Kubernetes Cluster"]

PD["Pod"]

DP["Deployment"]

CN["Container"]

end

classDef aws fill:#FF9900,stroke:#232F3E,color:#232F3E

class ECS,EKS aws

`

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`yaml

ECS Task Definition Example

`

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`yaml

Kubernetes Deployment Example

`

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`typescript

// AWS CDK Example for ECS

import * as ecs from 'aws-cdk-lib/aws-ecs';

import * as ec2 from 'aws-cdk-lib/aws-ec2';

const cluster = new ecs.Cluster(this, 'Cluster', {

vpc: new ec2.Vpc(this, 'Vpc')

});

const taskDefinition = new ecs.FargateTaskDefinition(this, 'TaskDef');

taskDefinition.addContainer('web', {

image: ecs.ContainerImage.fromRegistry('nginx:latest'),

memoryLimitMiB: 512,

cpu: 256,

portMappings: [{ containerPort: 80 }]

});

`

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`typescript

// AWS CDK Example for EKS

import * as eks from 'aws-cdk-lib/aws-eks';

import * as ec2 from 'aws-cdk-lib/aws-ec2';

const cluster = new eks.Cluster(this, 'Cluster', {

version: eks.KubernetesVersion.V1_27,

defaultCapacity: 2,

defaultCapacityInstance: ec2.InstanceType.of(

ec2.InstanceClass.T3,

ec2.InstanceSize.MEDIUM

)

});

cluster.addManifest('web-app', {

apiVersion: 'apps/v1',

kind: 'Deployment',

metadata: { name: 'web-app' },

spec: {

replicas: 3,

selector: { matchLabels: { app: 'web' } },

template: {

metadata: { labels: { app: 'web' } },

spec: {

containers: [{

name: 'web',

image: 'nginx:latest'

}]

}

}

}

});

`

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`yaml

ECS Service with Application Load Balancer

`

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`yaml

EKS with AWS Load Balancer Controller

`

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`json

{

"Type": "AWS::ApplicationAutoScaling::ScalingPolicy",

"Properties": {

"PolicyName": "CPUScaling",

"PolicyType": "TargetTrackingScaling",

"ScalingTargetId": { "Ref": "ScalingTarget" },

"TargetTrackingScalingPolicyConfiguration": {

"TargetValue": 70.0,

"PredefinedMetricSpecification": {

"PredefinedMetricType": "ECSServiceAverageCPUUtilization"

}

}

}

}

`

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`yaml

apiVersion: autoscaling/v2

kind: HorizontalPodAutoscaler

metadata:

name: web-hpa

spec:

scaleTargetRef:

apiVersion: apps/v1

kind: Deployment

name: web-app

minReplicas: 2

maxReplicas: 10

metrics:

- type: Resource

resource:

name: cpu

target:

type: Utilization

averageUtilization: 70

`

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1. Fargate Pricing

- vCPU per hour: $0.04048

- Memory per GB-hour: $0.004445

- No cluster management fee

2. EC2 Launch Type

- Only pay for EC2 instances

- Additional EBS volumes

- No additional orchestration costs

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1. Cluster Costs

- $0.10 per hour per cluster

- Control plane management fee

2. Node Costs

- EC2 instance costs

- EBS volumes

- Additional services (Load Balancer, etc.)

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`json

{

"Version": "2012-10-17",

"Statement": [

{

"Effect": "Allow",

"Action": [

"ecs:CreateCluster",

"ecs:DeregisterContainerInstance",

"ecs:DiscoverPollEndpoint",

"ecs:Poll",

"ecs:RegisterContainerInstance",

"ecs:StartTelemetrySession",

"ecs:Submit*",

"ecr:GetAuthorizationToken",

"ecr:BatchCheckLayerAvailability",

"ecr:GetDownloadUrlForLayer",

"ecr:BatchGetImage"

],

"Resource": "*"

}

]

}

`

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`yaml

apiVersion: rbac.authorization.k8s.io/v1

kind: Role

metadata:

namespace: default

name: pod-reader

rules:

`

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`python

import boto3

import datetime

cloudwatch = boto3.client('cloudwatch')

def get_ecs_metrics():

response = cloudwatch.get_metric_statistics(

Namespace='AWS/ECS',

MetricName='CPUUtilization',

Dimensions=[

{'Name': 'ClusterName', 'Value': 'production'},

{'Name': 'ServiceName', 'Value': 'web-app'}

],

StartTime=datetime.datetime.utcnow() - datetime.timedelta(hours=1),

EndTime=datetime.datetime.utcnow(),

Period=300,

Statistics=['Average']

)

return response

`

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`yaml

apiVersion: monitoring.coreos.com/v1

kind: ServiceMonitor

metadata:

name: web-monitor

spec:

selector:

matchLabels:

app: web

endpoints:

- port: web

interval: 15s

`

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1. Task Definition Design

- Use task definition versioning

- Implement proper logging

- Set appropriate resource limits

- Use secrets management

2. Service Configuration

- Enable service auto scaling

- Use appropriate deployment strategies

- Implement health checks

- Configure service discovery

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1. Cluster Management

- Use managed node groups

- Implement proper RBAC

- Enable cluster autoscaler

- Use pod security policies

2. Application Deployment

- Use Helm charts

- Implement pod disruption budgets

- Configure resource requests/limits

- Use network policies

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`bash

Example migration script

`

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`bash

Example migration script

``

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Choose ECS if you:

Choose EKS if you:

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1. [AWS ECS Documentation](https://docs.aws.amazon.com/ecs/)

2. [AWS EKS Documentation](https://docs.aws.amazon.com/eks/)

3. [ECS vs EKS Pricing](https://aws.amazon.com/pricing/)

4. [Container Services Blog](https://aws.amazon.com/blogs/containers/)

5. [ECS Best Practices](https://docs.aws.amazon.com/AmazonECS/latest/bestpracticesguide/)

6. [EKS Best Practices](https://aws.github.io/aws-eks-best-practices/)

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