This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).
# AWS::EC2::EC2Fleet CapacityRebalance

The Spot Instance replacement strategy to use when Amazon EC2 emits a rebalance notification signal that your Spot Instance is at an elevated risk of being interrupted. For more information, see [Capacity rebalancing](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-fleet-capacity-rebalance.html) in the *Amazon EC2 User Guide*.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[ReplacementStrategy](#cfn-ec2-ec2fleet-capacityrebalance-replacementstrategy)" : {{String}},
 "[TerminationDelay](#cfn-ec2-ec2fleet-capacityrebalance-terminationdelay)" : {{Integer}}
}
```
### YAML

```
 [ReplacementStrategy](#cfn-ec2-ec2fleet-capacityrebalance-replacementstrategy): {{String}}
 [TerminationDelay](#cfn-ec2-ec2fleet-capacityrebalance-terminationdelay): {{Integer}}
```
## Properties

`ReplacementStrategy` 
The replacement strategy to use. Only available for fleets of type `maintain`. 
`launch` - EC2 Fleet launches a 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 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. 
*Required*: No 
*Type*: String 
*Allowed values*: `launch | launch-before-terminate` 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`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. 
*Required*: No 
*Type*: Integer 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)</div><div class="naked_ctrl">
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