EKS vs Self-Managed K8s vs ECS
Compare EKS with running Kubernetes yourself on EC2 and with ECS, AWS's own container orchestrator.
AWS gives you several ways to run containers. Choosing well saves a lot of operational pain.
| Option | Control plane | Best when |
|---|---|---|
| EKS | Managed by AWS | You want standard Kubernetes without operating the masters. |
| Self-managed K8s (e.g. kubeadm on EC2) | You run it all | You need deep customization and accept full operational cost. |
| ECS | Managed by AWS | You want simple AWS-native orchestration and don't need Kubernetes. |
Rule of thumb
- Already invested in the Kubernetes ecosystem (Helm, operators, portability)? Choose EKS.
- Small AWS-only workload, want the least moving parts? ECS with Fargate is simpler.
- Need to modify the control plane itself? Only then consider self-managed.
Example
# EKS uses kubectl / Kubernetes manifests
kubectl apply -f deployment.yaml
# ECS uses task definitions via the AWS CLI (different world)
aws ecs register-task-definition --cli-input-json file://task-def.jsonWhen to use it
- A team migrating from self-managed kubeadm clusters to EKS eliminates manual etcd backup scripts and control plane upgrade playbooks.
- A gaming company chooses EKS over ECS because their platform team is already Kubernetes-fluent and wants portable YAML manifests.
- A batch-processing shop evaluates EKS Fargate against ECS Fargate to pick the option that fits their existing Helm chart library.
More examples
EKS cluster via eksctl
Creates a fully managed EKS cluster in one command, contrasting with the multi-step kubeadm init process of self-managed Kubernetes.
eksctl create cluster \
--name prod \
--version 1.30 \
--nodegroup-name workers \
--nodes 3ECS task definition example
An ECS task definition uses AWS-proprietary format, contrasting with the portable Kubernetes Deployment YAML used on EKS.
{
"family": "api-task",
"requiresCompatibilities": ["FARGATE"],
"cpu": "512",
"memory": "1024",
"containerDefinitions": [{
"name": "api",
"image": "123456789.dkr.ecr.us-east-1.amazonaws.com/api:latest",
"portMappings": [{"containerPort": 8080}]
}]
}Kubernetes Deployment on EKS
Standard Kubernetes Deployment YAML that runs unchanged on EKS, GKE, or AKS — demonstrating EKS's portability advantage over ECS.
apiVersion: apps/v1
kind: Deployment
metadata:
name: api
spec:
replicas: 3
selector:
matchLabels:
app: api
template:
metadata:
labels:
app: api
spec:
containers:
- name: api
image: 123456789.dkr.ecr.us-east-1.amazonaws.com/api:latest
ports:
- containerPort: 8080
Discussion