Amazon EC2 Auto Scaling now supports reservations then balanced Availability Zone distribution
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Amazon EC2 Auto Scaling now offers reservations-then-balanced, a new Availability Zone distribution strategy that prioritizes launching instances into capacity reservations before distributing remaining capacity evenly across Availability Zones.
- Maximizes utilization of pre-purchased capacity including On-Demand Capacity Reservations, Capacity Blocks, and Interruptible Capacity Reservations
- Configure via AvailabilityZoneDistribution in Auto Scaling group settings
- Target reservations by Capacity Reservation Group ARN or individual IDs
- No additional charges; standard EC2 pricing applies
- Available in all AWS commercial Regions
This strategy combines efficient reservation utilization with Auto Scaling's operational simplicity and resilience benefits.
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