Amazon ECS
User Guide for AWS Fargate (API Version 2014-11-13)

Amazon ECS Task Definitions

A task definition is required to run Docker containers in Amazon ECS. Some of the parameters you can specify in a task definition include:

  • The Docker image to use with each container in your task

  • How much CPU and memory to use with each task

  • The launch type to use, which determines the infrastructure on which your tasks are hosted

  • The Docker networking mode to use for the containers in your task

  • The logging configuration to use for your tasks

  • Whether the task should continue to run if the container finishes or fails

  • The command the container should run when it is started

  • Any data volumes that should be used with the containers in the task

  • The IAM role that your tasks should use

Your entire application stack does not need to exist on a single task definition, and in most cases it should not. Your application can span multiple task definitions by combining related containers into their own task definitions, each representing a single component. For more information, see Application Architecture.