# RollbackInstanceRefresh


Cancels an instance refresh that is in progress and rolls back any changes that it made. Amazon EC2 Auto Scaling replaces any instances that were replaced during the instance refresh. This restores your Auto Scaling group to the configuration that it was using before the start of the instance refresh. 

This operation is part of the [instance refresh feature](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-refresh.html) in Amazon EC2 Auto Scaling, which helps you update instances in your Auto Scaling group after you make configuration changes.

A rollback is not supported in the following situations: 
+ There is no desired configuration specified for the instance refresh.
+ The Auto Scaling group has a launch template that uses an AWS Systems Manager parameter instead of an AMI ID for the `ImageId` property.
+ The Auto Scaling group uses the launch template's `$Latest` or `$Default` version.

When you receive a successful response from this operation, Amazon EC2 Auto Scaling immediately begins replacing instances. You can check the status of this operation through the [DescribeInstanceRefreshes](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribeInstanceRefreshes.html) API operation. 

## Request Parameters


 For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

 ** AutoScalingGroupName **   
The name of the Auto Scaling group.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*`   
Required: Yes

## Response Elements


The following element is returned by the service.

 ** InstanceRefreshId **   
The instance refresh ID associated with the request. This is the unique ID assigned to the instance refresh when it was started.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*` 

## Errors


For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** ActiveInstanceRefreshNotFound **   
The request failed because an active instance refresh or rollback for the specified Auto Scaling group was not found.  
HTTP Status Code: 400

 ** IrreversibleInstanceRefresh **   
The request failed because a desired configuration was not found or an incompatible launch template (uses a Systems Manager parameter instead of an AMI ID) or launch template version (`$Latest` or `$Default`) is present on the Auto Scaling group.  
HTTP Status Code: 400

 ** LimitExceeded **   
You have already reached a limit for your Amazon EC2 Auto Scaling resources (for example, Auto Scaling groups, launch configurations, or lifecycle hooks). For more information, see [DescribeAccountLimits](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribeAccountLimits.html).    
 ** message **   

HTTP Status Code: 400

 ** ResourceContention **   
You already have a pending update to an Amazon EC2 Auto Scaling resource (for example, an Auto Scaling group, instance, or load balancer).    
 ** message **   

HTTP Status Code: 500

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/autoscaling-2011-01-01/RollbackInstanceRefresh) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/autoscaling-2011-01-01/RollbackInstanceRefresh)