Posted On: Dec 17, 2019

Starting today, you can configure EC2 Fleet to utilize On-Demand Capacity Reservations first when launching On-Demand instances. EC2 Fleet will then look for available Capacity Reservations within the instance pools specified, and will fully utilize available Capacity Reservations before launching On-Demand instances on net new capacity.

Amazon EC2 Fleet simplifies the provisioning of EC2 capacity across different instance types, Availability Zones (AZs), and purchase options to optimize for scale, performance, and cost. Allocation strategies let you determine how EC2 Fleet should select from the instance types and AZs you have specified to fulfill the desired capacity. The new Capacity Reservation usage strategy works in conjunction with the Allocation Strategy (lowest-price or prioritized). This feature is ideal for secondary workloads that can utilize reserved capacity held for primary workloads during off-peak hours, there by minimizing your overall compute costs.

This feature is available in all public AWS regions, including AWS GovCloud (US) Regions. To learn more about this feature, visit this page. To learn more about simplifying the provisioning of Amazon EC2 capacity across different Amazon EC2 instance types, AWS Availability Zones and across On-Demand, RI and Spot purchase models using Amazon EC2 Fleet, visit this blog. To learn more about Amazon EC2 pricing models, visit this page.