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Amazon ECS Managed Instances now integrates with Amazon EC2 Capacity Reservations

Published
February 26, 2026
https://aws.amazon.com/about-aws/whats-new/2026/02/ecs-mi-ec2-capacity-reservations/

Amazon ECS Managed Instances Integrates with EC2 Capacity Reservations

Amazon ECS Managed Instances now integrates with Amazon EC2 Capacity Reservations, allowing you to leverage reserved capacity for predictable workload availability while ECS manages infrastructure. This integration balances reliable capacity scaling with cost efficiency, ensuring high availability for mission-critical workloads.

New Features

  • Configure ECS Managed Instances capacity providers to use capacity reservations by setting the capacityOptionType parameter to reserved.
  • Specify reservation preferences to optimize cost and availability:
    • reservations-only: Launch EC2 instances exclusively in reserved capacity for maximum predictability.
    • reservations-first: Prefer reservations while maintaining flexibility to fall back to on-demand capacity when needed.
    • reservations-excluded: Prevent your capacity provider from using reservations altogether.

What to do

  • Use the AWS Management Console, AWS CLI, AWS CloudFormation, or AWS SDKs to configure your ECS Managed Instances capacity provider.
  • Set capacityOptionType=reserved and provide a capacity reservation group and reservation strategy.

This feature is available in all AWS Regions. For more details, refer to the documentation.




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