Enable Capacity Rebalancing using the Amazon Web Services Management Console or Amazon CLI

To enable Capacity Rebalancing for a new Auto Scaling group

1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/, and choose Auto Scaling Groups from the navigation pane.

2. Choose Create Auto Scaling group.

3. For Step 1: Choose launch template or configuration, enter a name for the Auto Scaling group, choose a launch template, and then choose Next to proceed to the next step.

4. For Step 2: Choose instance launch options, for Instance type requirements, choose settings to create a mixed instances group. This includes the instance types that it can launch, instance purchase options, and allocation strategies for Spot and On-Demand Instances. By default, these settings are not configured. To configure them, you must select Override launch template. For more information about creating a mixed instances group, see Auto Scaling groups with multiple instance types and purchase options.

5. Under Network, choose the options as desired. Verify that the subnets you want to use are in different Availability Zones.

6. Under the Allocation strategies section, choose a Spot allocation strategy. Enable or disable Capacity Rebalancing by selecting or clearing the check box under Capacity Rebalancing. You only see this option when you request a percentage of the Auto Scaling group to be launched as Spot Instances in the Instance purchase options section.

7. Create the Auto Scaling group.

8. (Optional) Add lifecycle hooks as needed. For more information, see Add lifecycle hooks to your Auto Scaling group.

To enable or disable Capacity Rebalancing for an existing Auto Scaling group

1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/, and choose Auto Scaling Groups from the navigation pane.

2. Select the check box next to your Auto Scaling group. A split pane opens in the bottom of the page.

3. On the Details tab, choose Allocation strategies, Edit.

4. Under the Allocation strategies section, enable or disable Capacity Rebalancing by selecting or clearing the check box under Capacity Rebalancing.

5. Choose Update.

To enable Capacity Rebalancing for an existing Auto Scaling group

• Use the following update-auto-scaling-group command to enable Capacity Rebalancing.

  aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-asg \
    --capacity-rebalance

To verify that Capacity Rebalancing is enabled for an Auto Scaling group

• Use the following describe-auto-scaling-groups command to verify that Capacity Rebalancing is enabled and to view the details.

  aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name my-asg

  The following is an example response.

  {
      "AutoScalingGroups": [
          {
              "AutoScalingGroupName": "my-asg",
              "AutoScalingGroupARN": "arn",
              ...
              "CapacityRebalance": true
          }
      ]
  }