Amazon ECS task definitions
Atask definition is a blueprint for your application. It is a textfile in JSON format that describes the parameters and one or more containers that form yourapplication.
The following are some of the parameters that you can specify in a task definition:
The capacity to use, which determines the infrastructure that your tasks arehosted on
The Docker image to use with each container in your task
How much CPU and memory to use with each task or each container within atask
The memory and CPU requirements
The operating system of the container that the task runs on
The Docker networking mode to use for the containers in your task
The logging configuration to use for your tasks
Whether the task continues to run if the container finishes or fails
The command that the container runs when it's started
Any data volumes that are used with the containers in the task
The IAM role that your tasks use
For a complete list of task definition parameters, seeAmazon ECS task definition parameters for Fargate.
After you create a task definition, you can run the task definition as a task or aservice.
Atask is the instantiation of a task definition within acluster. After you create a task definition for your application within Amazon ECS, youcan specify the number of tasks to run on your cluster.
An Amazon ECSservice runs and maintains yourdesired number of tasks simultaneously in an Amazon ECS cluster. How it works is that, ifany of your tasks fail or stop for any reason, the Amazon ECS service scheduler launchesanother instance based on your task definition. It does this to replace it andthereby maintain your desired number of tasks in the service.
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