ZStack offers auto-scaling capabilities that let you automatically add or remove VM instances from an auto scaling group (ASG) in response to load balancing of VM instances, your business load changes, and predefined scaling policies. With the auto scaling service, you can better leverage the Cloud resources, reduce the O&M costs, and ensure smooth business operations. Currently, the auto scaling service is applicable to KVM VM instances.
An online retailer has initiated a sales promotion such as red envelop fever and limited-time offer during Double Eleven, the Spring Festival, and other festivals and shopping sprees. As the business workload is skyrocketing, VM instances need to be automatically scaled out in time to avoid access delay and excessive resource loads.
After the festivals and shopping sprees, the business workload of the retailer obviously declines. In that case, VM instances need to be automatically removed in time to avoid a waste of resources.
To ensure that the core businesses of the retailer are running normally, the number of the healthy VM instances must not be lower than some threshold.
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