Modify an active Capacity Reservation
If you have an existing Capacity Reservation which isn't a good fit for the workload that needs the capacity, you can modify the instance quantity, instance eligibility (open or targeted), and end time (At specific time or Manually). You can't
modify a Capacity Reservation after it has expired or after you have explicitly canceled it. If you specify a new instance quantity that exceeds your remaining On-Demand Instance limit for the selected instance type, the update fails.
You can't change the instance type, EBS optimization, platform, Availability Zone, or tenancy of an existing Capacity Reservation. If you need to modify any of these attributes, we recommend that you cancel the reservation, and then create a new one with the required attributes.
If you modify an existing Capacity Reservation by changing the instance eligibility from targeted to open, any running instances that match the attributes of the Capacity Reservation, have the CapacityReservationPreference parameter set to open,
and are not yet running in a Capacity Reservation, will automatically use the modified Capacity Reservation.
Note
To change the instance eligibility, the Capacity Reservation must be completely idle (zero usage) because Amazon EC2 can't modify instance eligibility when instances are running inside the reservation.
To modify a Capacity Reservation using the console
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/
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Choose Capacity Reservations, select the Capacity Reservation to modify, and then choose Edit.
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Modify the Total capacity, Capacity Reservation ends, or Instance eligibility options as needed, and choose Save.
To modify a Capacity Reservation using the AWS CLI
Use the modify-capacity-reservation command. For example, the following command modifies a Capacity Reservation to reserve capacity for eight instances.
aws ec2 modify-capacity-reservation --capacity-reservation-idcr-1234567890abcdef0--instance-count8
