Request Parameters Response Elements Errors See Also

ModifyCapacityReservation

Modifies a Capacity Reservation's capacity, instance eligibility, and the conditions under which it is to be released. You can't modify a Capacity Reservation's instance type, EBS optimization, platform, instance store settings, Availability Zone, or tenancy. If you need to modify any of these attributes, we recommend that you cancel the Capacity Reservation, and then create a new one with the required attributes. For more information, see Modify an active Capacity Reservation.

The allowed modifications depend on the state of the Capacity Reservation:

assessing or scheduled state - You can modify the tags only.
pending state - You can't modify the Capacity Reservation in any way.
active state but still within the commitment duration - You can't decrease the instance count or set an end date that is within the commitment duration. All other modifications are allowed.
active state with no commitment duration or elapsed commitment duration - All modifications are allowed.
expired, cancelled, unsupported, or failed state - You can't modify the Capacity Reservation in any way.

Request Parameters

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.

Accept

Reserved. Capacity Reservations you have created are accepted by default.

Type: Boolean

Required: No

AdditionalInfo

Reserved for future use.

Type: String

Required: No

CapacityReservationId

The ID of the Capacity Reservation.

Type: String

Required: Yes

DryRun

Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation. Otherwise, it is UnauthorizedOperation.

Type: Boolean

Required: No

EndDate

The date and time at which the Capacity Reservation expires. When a Capacity Reservation expires, the reserved capacity is released and you can no longer launch instances into it. The Capacity Reservation's state changes to expired when it reaches its end date and time.

The Capacity Reservation is cancelled within an hour from the specified time. For example, if you specify 5/31/2019, 13:30:55, the Capacity Reservation is guaranteed to end between 13:30:55 and 14:30:55 on 5/31/2019.

You must provide an EndDate value if EndDateType is limited. Omit EndDate if EndDateType is unlimited.

Type: Timestamp

Required: No

EndDateType

Indicates the way in which the Capacity Reservation ends. A Capacity Reservation can have one of the following end types:

unlimited - The Capacity Reservation remains active until you explicitly cancel it. Do not provide an EndDate value if EndDateType is unlimited.
limited - The Capacity Reservation expires automatically at a specified date and time. You must provide an EndDate value if EndDateType is limited.

Type: String

Valid Values: unlimited | limited

Required: No

InstanceCount

The number of instances for which to reserve capacity. The number of instances can't be increased or decreased by more than 1000 in a single request.

Type: Integer

Required: No

InstanceMatchCriteria

The matching criteria (instance eligibility) that you want to use in the modified Capacity Reservation. If you change the instance eligibility of an existing Capacity Reservation from targeted to open, any running instances that match the attributes of the Capacity Reservation, have the CapacityReservationPreference set to open, and are not yet running in the Capacity Reservation, will automatically use the modified Capacity Reservation.

To modify the instance eligibility, the Capacity Reservation must be completely idle (zero usage).

Type: String

Valid Values: open | targeted

Required: No

Response Elements

The following elements are returned by the service.

requestId

The ID of the request.

Type: String

return

Returns true if the request succeeds; otherwise, it returns an error.

Type: Boolean

Errors

For information about the errors that are common to all actions, see Common client error codes.