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Auto Scaling

Scaling group

Pausing/Resuming scaling group processes

Scenario

By default, a scaling group automatically executes adjustments, such as instance scaling triggered by health checks or scaling tasks. You may need precise control over adjustments, such as pausing adjustments to perform other operations on instances or enabling automatic scaling again after resuming the adjustments. You can refer to this topic to pause or resume the scaling process of a scaling group.

tip

This operation only provides process-level control for scaling group scale-out or scale-in. To achieve instance-level control, we recommend that you use the following two features:

Configure instance protection: Instances in the protected state will not be automatically removed or deleted.

Configure standby instances: Instances in the standby state will no longer receive business traffic, their load balancing weight will be set to zero, and they will not be automatically removed or deleted.

Prerequisites

When the scaling group is in Locked or Deleting status, this operation is not supported.

Scaling group process types

Scaling group process type	Impact of pause on the scaling group	Impact of resuming on the scaling group
Scale-in process	The scaling group will no longer execute scale-in operations, including automatic instance scale-in and manual instance removal or deletion. If the expected instance count feature is enabled, you can modify the expected instance count, but this will not change the number of instances in the scaling group.	The scaling group will resume the execution of all scale-in operations, including automatic instance scale-in and manual instance removal or deletion. If the expected instance count feature is enabled and the expected instance count is modified during the pause, the scaling group will automatically remove or delete instances based on the updated expected instance count once scaling group processes are resumed.
Scale-out process	The scaling group will no longer execute scale-out operations, including automatic instance scale-out and manual instance addition. If the expected instance count feature is enabled, you can modify the expected instance count, but this will not change the number of instances in the scaling group.	The scaling group will resume all scale-out operations, including automatic instance scale-out and manual instance addition. If the expected instance count feature is enabled and the expected instance count is modified during the pause, the scaling group will automatically add instances based on the updated expected instance count once scaling group processes are resumed.
Health Check	The health check capability is paused and unhealthy instances are not removed or deleted even if they exist in the scaling group.	The health check capability is recovered and unhealthy instances are automatically removed.
Alert task	When alert tasks are created for the scaling group, adjustments will not be executed even if the trigger conditions of the tasks are met.	When alert tasks are created for the scaling group and the trigger conditions of the tasks are met, adjustments will be resumed.
Scheduled tasks	When scheduled/periodic tasks are created for the scaling group, adjustments will not be executed even if the trigger time has arrived.	When scheduled/periodic tasks are created for the scaling group and the trigger time of the tasks has not yet arrived, adjustments will be resumed.

Procedure

In the top menu bar, select the project and region of your target resource.

Click the name of the scaling group and select the "Overview" tab.

Click the edit button to the right of "Suspended process", and then select or clear the scaling group process types.

Click the "OK" button to complete the operation.