# FleetSpotCapacityRebalance


The strategy to use when Amazon EC2 emits a signal that your Spot Instance is at an elevated risk of being interrupted.

## Contents


 ** replacementStrategy **   
The replacement strategy to use. Only available for fleets of type `maintain`.  
 `launch` - EC2 Fleet launches a new replacement Spot Instance when a rebalance notification is emitted for an existing Spot Instance in the fleet. EC2 Fleet does not terminate the instances that receive a rebalance notification. You can terminate the old instances, or you can leave them running. You are charged for all instances while they are running.   
 `launch-before-terminate` - EC2 Fleet launches a new replacement Spot Instance when a rebalance notification is emitted for an existing Spot Instance in the fleet, and then, after a delay that you specify (in `TerminationDelay`), terminates the instances that received a rebalance notification.  
Type: String  
Valid Values: `launch | launch-before-terminate`   
Required: No

 ** terminationDelay **   
The amount of time (in seconds) that Amazon EC2 waits before terminating the old Spot Instance after launching a new replacement Spot Instance.  
Required when `ReplacementStrategy` is set to `launch-before-terminate`.  
Not valid when `ReplacementStrategy` is set to `launch`.  
Valid values: Minimum value of `120` seconds. Maximum value of `7200` seconds.  
Type: Integer  
Required: No

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ec2-2016-11-15/FleetSpotCapacityRebalance) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/FleetSpotCapacityRebalance) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/FleetSpotCapacityRebalance)