This diagram outlines visually what happens when you launch a task with the Fargate launch type:

This diagram outlines visually what happens when you launch a task with the EC2 launch type:

The second is to use Fargate, a serverless environment for containers fully managed by AWS that enables customers to run containers without having to manage any underlying infrastructure. With Fargate, customers only get charged for tasks they run. The first is to run ECS tasks on EC2 instances that you own, manage, and pay for, but you don’t have to pay per-task. Introduction to the ECS launch types availableĮCS has two different models for running your containers, which we call launch types. In particular, we will discuss how CPU and Memory resources defined at the task level and container level relate to CPU and Memory resources available on EC2 and Fargate. The purpose of this blog post is to discuss what options you have (and what rules they have to cope with) in terms of resource management. The official ECS documentation has more information about these constructs. The diagram below outlines the relationship between containers and tasks: In ECS, you can’t run a container: rather, you run a task, which, in turns, run your container(s). A task contains (no pun intended) one or more containers. This means that the ECS APIs operate on tasks rather than individual containers. In ECS, the basic unit of a deployment is a task, a logical construct that models one or more containers. Windows containers, while supported on ECS, are outside of the scope of this blog post. Specifically, we want to clarify how CPU and memory resources can be reserved and consumed by Linux containers deployed by ECS on different type of launch types: EC2 and AWS Fargate (Fargate). On August 19, 2019, we launched a new Amazon Elastic Container Service (Amazon ECS) feature that allows containers to configure available swap space on Linux. We want to take this opportunity to step back and talk more holistically how ECS resource management works (including the behavior this new feature has introduced).

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