Request Parameters Response Elements Errors See Also

ModifyFleet

Modifies the specified EC2 Fleet.

You can only modify an EC2 Fleet request of type maintain.

While the EC2 Fleet is being modified, it is in the modifying state.

To scale up your EC2 Fleet, increase its target capacity. The EC2 Fleet launches the additional Spot Instances according to the allocation strategy for the EC2 Fleet request. If the allocation strategy is lowest-price, the EC2 Fleet launches instances using the Spot Instance pool with the lowest price. If the allocation strategy is diversified, the EC2 Fleet distributes the instances across the Spot Instance pools. If the allocation strategy is capacity-optimized, EC2 Fleet launches instances from Spot Instance pools with optimal capacity for the number of instances that are launching.

To scale down your EC2 Fleet, decrease its target capacity. First, the EC2 Fleet cancels any open requests that exceed the new target capacity. You can request that the EC2 Fleet terminate Spot Instances until the size of the fleet no longer exceeds the new target capacity. If the allocation strategy is lowest-price, the EC2 Fleet terminates the instances with the highest price per unit. If the allocation strategy is capacity-optimized, the EC2 Fleet terminates the instances in the Spot Instance pools that have the least available Spot Instance capacity. If the allocation strategy is diversified, the EC2 Fleet terminates instances across the Spot Instance pools. Alternatively, you can request that the EC2 Fleet keep the fleet at its current size, but not replace any Spot Instances that are interrupted or that you terminate manually.

If you are finished with your EC2 Fleet for now, but will use it again later, you can set the target capacity to 0.

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.

Context

Reserved.

Type: String

Required: No

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

ExcessCapacityTerminationPolicy

Indicates whether running instances should be terminated if the total target capacity of the EC2 Fleet is decreased below the current size of the EC2 Fleet.

Supported only for fleets of type maintain.

Type: String

Valid Values: no-termination | termination

Required: No

FleetId

The ID of the EC2 Fleet.

Type: String

Required: Yes

LaunchTemplateConfig.N

The launch template and overrides.

Type: Array of FleetLaunchTemplateConfigRequest objects

Array Members: Minimum number of 0 items. Maximum number of 50 items.

Required: No

TargetCapacitySpecification

The size of the EC2 Fleet.

Type: TargetCapacitySpecificationRequest object

Required: No

Response Elements

The following elements are returned by the service.

requestId

The ID of the request.

Type: String

return

If the request succeeds, the response returns true. If the request fails, no response is returned, and instead an error message is returned.

Type: Boolean

Errors

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