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Amazon Elastic Container Service (ECS) is a fully managed container orchestration service that lets you run, stop, and manage containers on a cluster. ECS removes the need to install, operate, and scale your own cluster management infrastructure — you describe what you want to run, and ECS handles the rest.
Running a single container on your laptop is simple. Running hundreds of containers across multiple servers in production is not. Container orchestration solves the hard problems:
| Problem | What Orchestration Provides |
|---|---|
| Scheduling | Deciding which host should run each container |
| Scaling | Adding or removing container instances based on demand |
| Health monitoring | Detecting failed containers and replacing them |
| Load balancing | Distributing incoming traffic across containers |
| Service discovery | Allowing containers to find and communicate with each other |
| Rolling updates | Deploying new versions without downtime |
| Resource management | Ensuring containers get the CPU and memory they need |
Amazon ECS is AWS's native answer to container orchestration.
Understanding ECS requires four key concepts:
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