AWS Fargate Spot compared to reserved instances

With Amazon ECS on AWS Fargate capacity providers, you can use both Fargate and Fargate Spot capacity with your Amazon ECS tasks. With Fargate Spot, you can run interruption tolerant Amazon ECS tasks at a rate that’s discounted compared to the Fargate price. When AWS needs the capacity back, tasks are interrupted with a 2-minute warning. When the Spot instances are terminated, ECS requests new Spot capacity, possibly from a different AZ to replace the reclaimed instances.

The default weights used for Fargate compared to Fargate Spot instances are defined through parameters in the solution source code FARGATE_RESERVED_WEIGHT = 1 and FARGATE_SPOT_WEIGHT = 1 respectively.