Task and Task Definitions

A task definition is required to run Docker containers in Amazon ECS.

A task definition is a text file in JSON format that describes one or more containers, up to a maximum of 10.

Task definitions use Docker images to launch containers.

You specify the number of tasks to run (i.e. the number of containers).

Some of the parameters you can specify in a task definition include:

Which Docker images to use with the containers in your task.

How much CPU and memory to use with each container.

Whether containers are linked together in a task.

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

What (if any) ports from the container are mapped to the host container instances.

Whether the task should continue if the container finished or fails.

The commands the container should run when it is started.

Environment variables that should be passed to the container when it starts.

Data volumes that should be used with the containers in the task.

IAM role the task should use for permissions.

You can use Amazon ECS Run task to run one or more tasks once.

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