Auto Scaling
- Product Introduction
- Getting Started
- Tutorial
- Launch Configuration
- Scaling Groups
- Creating Notifications
- Expanding and Reducing Capacity
- Troubleshooting
- Practical Tutorial
- Customer Cases
- API Documentation
- Scaling Group APIs
- Launch Configuration APIs
- Making API Requests
- Scaling Group Instances APIs
- Scheduled Action APIs
- Alarm Trigger Policy APIs
- Notification APIs
- Lifecycle Hook APIs
- Instance Refresh APIs
- Other APIs
Scale-in Process
Last updated: 2024-01-08 17:53:30
For each scaling group, you can set the time for adding (scale-out) or removing (scale-in) instances. You can scale the scaling group manually by adding or removing instances, or you can enable AS to execute this process automatically by using a scaling policy.
Note:
When a scaling group is scaled in automatically, it needs to know which instances should be terminated first, and the selection is based on the removal policy.
During scale-in, you can prevent specified instances from being terminated by AS by using instance protection.
For a scaling group configured with a CLB instance, when the instances are automatically or manually removed or deleted, they will be automatically disassociated from the CLB instance.
Removal policy
AS will determine which CVM should be removed based on the removal policy during scale-in. You can choose from the following two removal policies:
Remove the oldest instances: Remove the earliest automatically added instances from the scaling group. Instances added automatically are removed first, followed by the earliest manually added instances.
Remove the latest instances: Remove the latest automatically added CVM instances from the scaling group. Instances added automatically are removed first, followed by the latest manually added instances.
Note:
Under both of the removal policies, AS will remove automatically created CVM instances before those manually added.
Setting and modifying removal policy in the console
There are two ways to set this up:
Select the removal policy you want when creating the scaling group.
On the Scaling Group Details page, click Edit to modify the scaling policy.
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