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Auto Scaling (AS) uses preset AS policies to automatically scale service resources up and down based on service requirements. You can configure scheduled and periodic scaling tasks, monitoring policies, and AS group capacity thresholds to enable AS to automatically increase or decrease the number of Elastic Cloud Server (ECS) instances. This ensures the stable and healthy running of your services.
If you need to deploy a distributed application system on a cloud platform, you can use AS to follow the demand curve for your system closely by planning scaling activities and configuring automatic resource adjustment based on monitoring data.
A management console that enables visibility is provided for you to view monitoring data for ECSs in AS groups and the ECS change trend.
How to maintain your ECS instances availability: Whether you are running one ECS instance or thousands, you can use Auto Scaling to detect impaired ECS instances and unhealthy applications, and replace the instances without your intervention. This ensures that your application is getting the compute capacity that you expect.
Automatically Scale your ECS fleet: Auto Scaling enables you to follow the demand curve for your applications closely, reducing the need to manually provision ECS capacity in advance. For example, you can set a condition to add new ECS instances in increments to the Auto Scaling group when the average utilization of your ECS fleet is high; and similarly, you can set a condition to remove instances in the same increments when CPU utilization is low. If you have predictable load changes, you can set a schedule through Auto Scaling to plan your scaling activities. You can use Cloud Eye to send alarms to trigger scaling activities and Elastic Load Balancing to help distribute traffic to your instances within Auto Scaling groups. Auto Scaling enables you to run your ECS fleet at optimal utilization.
The alarm-triggered AS policy of the AS service depends on the monitoring capability provided by Cloud Eye (CES). Therefore, the image selected for the AS configuration must have the Open Cloud PV driver installed to ensure that the CES service can obtain monitoring data of ECSs. Otherwise, the alarm-triggered AS policy becomes unavailable.