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Auto Scaling:Limits

Last Updated:Aug 21, 2023

This topic describes the limits on the features and resource quantities of Auto Scaling.

Limits on features

Auto Scaling features have the following limits:

  • The applications that are hosted on Elastic Compute Service (ECS) instances or elastic container instances in a scaling group must be stateless and horizontally scalable.

  • ECS instances or elastic container instances in a scaling group may be automatically released. We recommend that you do not store information such as sessions, application data, or logs on ECS instances or elastic container instances in a scaling group. If the applications that are hosted on ECS instances or elastic container instances require persistent storage of data, we recommend that you store status information such as sessions on independent ECS instances or elastic container instances, application data on ApsaraDB RDS instances, and logs in Log Service projects. For more information, see What is ApsaraDB RDS? and What is Simple Log Service?

  • Auto Scaling cannot automatically add the IP addresses of the ECS instances or elastic container instances to the IP address whitelists of ApsaraDB for Memcache instances. Therefore, you must manually add the IP addresses of the ECS instances or elastic container instances to the IP address whitelists. For more information, see Configure an IP address whitelist.

  • If you delete the ApsaraDB RDS instance, the Application Load Balancer (ALB) server group, the Classic Load Balancer (CLB) instance, or the backend server group of the CLB instance that is associated with a scaling group, the scaling group is automatically disassociated from the deleted resources.

  • If a scaling activity that is automatically triggered in a scaling group fails for 30 consecutive days or more, Auto Scaling disables the auto-triggered scaling feature for the scaling group during system inspections and notifies you by text message or email.

    Note

    If a scaling activity fails consecutively, we recommend that you log on to the Auto Scaling console to rectify the issue.

Limits on resource quantities

The following table describes the limits on the Auto Scaling resource quantities within an Alibaba Cloud account.

Item

Quota

Scaling groups in a single region

To view the scaling group quota, go to Quota Center.

Note

You can submit a ticket to request a quota increase.

Scaling configurations in a single scaling group

Scaling rules in a single scaling group

ApsaraDB RDS instances that can be associated with a scaling group

CLB instances that can be associated with a scaling group

ALB server groups that can be associated with a scaling group

Network Load Balancer (NLB) server groups that can be associated with a scaling group

vServer groups that can be associated with a scaling group

Maximum number of instances that can be contained in a scaling group

Scheduled tasks in a single region

ECS instances or elastic container instances that can be scaled at a time

500

Instance types in a single scaling configuration

10

Notification rules in a single scaling group

6

Lifecycle hooks in a single scaling group

10