Definition

Amazon EC2 Container Service

This definition is part of our Essential Guide: Virtual container technology options for management, security
Contributor(s): David Carty

Amazon EC2 Container Service (ECS) is a cloud computing service in Amazon Web Services (AWS) that manages containers. It allows users to run and alter applications or microservices on groups of servers called clusters through API calls and task definitions. Amazon ECS is a scalable service that is accessible through the AWS Management Console and through software developer's kits (SDKs).

Amazon developed ECS in response to the rise of popularity of containerization, which specifies rules for isolated sets of Elastic Compute Cloud instances to increase portability and computing performance by running on top of a host operating system. ECS supports Docker, an open source Linux container service.

ECS enables users to create and run Docker containers for distributed applications using a set of APIs. ECS evaluates and monitors CPU and memory output to determine the optimal deployment for a container. AWS customers can also use the service to update containers or scale them up or down. Elastic Load Balancing, Elastic Block Store volumes and Identity and Access Management roles are also supported for further customization.

EC2 Container Service includes two schedulers, which allow users to deploy containers based on computing needs or availability requirements. Long-running applications and batch jobs benefit from the use of schedulers for their responsiveness; ECS also supports third-party scheduling options.

Any third-party or private Docker registry can access ECS; the user needs to only specify the repository in the task definition for ECS to retrieve the images.

There is no additional cost to AWS customers for using ECS, though users still pay for EC2 instances in the cluster, plus any other billable AWS resources used. ECS limits users to 1,000 tasks per service and 10 containers per task definition.

This was last updated in June 2015

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