# InstanceRefreshStrategy

The strategy to use for the instance refresh.

- Source: [`aws-autoscaling/lib/auto-scaling-group.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0/packages/aws-cdk-lib/aws-autoscaling/lib/auto-scaling-group.ts#L1146)
- Type last changed: v2.263.0 · 31 Jul 2026

## Example

```ts
declare const vpc: ec2.Vpc;
declare const instanceType: ec2.InstanceType;
declare const machineImage: ec2.IMachineImage;
declare const alarm: cloudwatch.Alarm;

new autoscaling.AutoScalingGroup(this, 'ASG', {
  vpc,
  instanceType,
  machineImage,

  updatePolicy: autoscaling.UpdatePolicy.instanceRefresh({
    strategy: autoscaling.InstanceRefreshStrategy.ROLLING,
    minHealthyPercentage: 90,
    maxHealthyPercentage: 100,
    instanceWarmup: Duration.seconds(300),
    checkpointPercentages: [50, 100],
    checkpointDelay: Duration.minutes(10),
    alarms: [alarm],
  }),
});
```

## Members

| Member | Description |
| --- | --- |
| `ROLLING` | Terminate instances and launch new ones to replace them. |
| `REPLACE_ROOT_VOLUME` | Replace the root volume of instances in place. |

## Referenced by

- [`InstanceRefreshOptions`](/v2/docs/aws-cdk-lib.aws_autoscaling.InstanceRefreshOptions).strategy