AWS offers several ways to run an application. The three options most teams compare are EC2, ECS, and EKS. They are not interchangeable in every situation, and the most advanced option is not automatically the best one.
The right choice depends on your application, team skills, delivery process, scale, and appetite for operational work.
Amazon EC2: maximum control, more responsibility
EC2 provides virtual servers. You choose the operating system, install the runtime, deploy the application, configure Nginx, manage updates, and handle the operating system.
EC2 is a sensible option when:
- You have a traditional application that runs well on a server.
- The team is comfortable managing Linux and deployments.
- You need custom software or system-level configuration.
- You are migrating an existing server-based application.
- The architecture is still relatively simple.
The trade-off is operational work. Someone must patch the server, manage disk space, rotate logs, configure health checks, secure SSH or Session Manager access, and plan scaling.
Amazon ECS: containers without managing Kubernetes
ECS is AWS's container orchestration service. You package the application as a Docker image, define how it should run, and let ECS place and restart containers. With Fargate, AWS also manages the underlying compute infrastructure.
ECS is a strong choice when:
- Your team already uses Docker.
- You want repeatable deployments.
- You have several services but do not need Kubernetes features.
- You want simpler container operations than EKS.
- You want to scale services based on demand.
ECS reduces server-management work, but it does not remove the need for monitoring, IAM design, networking, image security, logging, and deployment discipline.
Amazon EKS: Kubernetes on AWS
EKS runs managed Kubernetes control planes. It is useful for organisations that need Kubernetes capabilities, operate many containerised services, or already have Kubernetes knowledge and tooling.
EKS may be appropriate when:
- Several teams deploy many services independently.
- The organisation has established Kubernetes experience.
- You require Kubernetes-native tools, policies, or portability.
- You need sophisticated scheduling, workload isolation, or platform engineering patterns.
EKS brings flexibility, but it also introduces complexity: cluster upgrades, networking, ingress, storage, IAM integration, resource requests, autoscaling, observability, and Kubernetes security policies. It should be chosen because the organisation needs it, not because Kubernetes is popular.
Questions to ask before deciding
- Can the team reliably deploy and troubleshoot this platform at 2 AM?
- How many applications and teams will use it?
- Does the application need containers now, or can it run well on EC2?
- Does the business need Kubernetes features, or does it only need reliable deployments?
- What will monitoring, networking, security, and backups look like after the first deployment?
A reasonable path for many teams
For a small application, start with EC2 or a managed platform that the team understands. When the application is containerised and deployments become repetitive, ECS is often a natural progression. Move to EKS only when its capabilities solve a real platform need.
Good architecture is not measured by how many services it contains. It is measured by whether the team can run it securely and reliably.