This topic describes how to put an ECS instance into the Protected state to prevent the ECS instance from being automatically removed from a scaling group. After an ECS instance is put into the Protected state, the SLB weight value of the ECS instance remains unchanged. If an ECS instance is in the Protected state, Auto Scaling does not check its health status or release it.

Background information

After an ECS instance is put into the Protected state:
  • If an SLB instance is associated with the scaling group to which the ECS instance belongs, the SLB weight value of the ECS instance remains unchanged.
  • The ECS instance stays in the Protected state until you manually remove it from the Protected state.
  • If a scale-in event is triggered, Auto Scaling will not remove the ECS instance. To release the ECS instance, you must remove the ECS instance from the Protected state and then remove it from the scaling group.
  • When the ECS instance is stopped or restarted, its health check status remains unchanged.

Procedure

  1. Log on to the Auto Scaling console.
  2. In the left-side navigation pane, click Scaling Groups.
  3. In the top navigation bar, select a region.
  4. Find the target scaling group and use one of the following methods to open the details page of the scaling group:
    • Click the ID of the scaling group in the Scaling Group Name/ID column.
    • Click Manage in the Actions column.
  5. In the left-side navigation pane, click ECS Instances.
  6. Select the source of an ECS instance.
    • To select an automatically created ECS instance, click the Auto Created tab.
    • To select a manually added ECS instance, click the Manually Added tab.
  7. Use one of the following methods to put one or more ECS instances into the Protected state:
    • Find the ECS instance that you want to put into the Protected state and click Switch to Protected in the Actions column.
    • Select multiple ECS instances that you want to put into the Protected state and click Switch to Protected in the lower part of the ECS Instances page.
  8. In the message that appears, click OK.