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Question 24

A customer uses Alibaba Cloud Auto Scaling service and creates a scaling group. He/she sets the `Minimum number of instances` to 6 and `Maximum number of instances` to 8.

After correctly configuring scaling settings, the customer adds a scaling rule `Adjust to 10 ECS instances`, and creates a scheduled task based on this rule.

And then, the customer checks the scaling group and see it already contains 6 valid ECS instances, he/she then enables this scaling group immediately.

How many ECS instances are left in the scaling group when the scheduled task is activated once?

    Correct Answer: A

    When a scheduled task activates a scaling rule that adjusts the number of instances beyond the maximum limit set for a scaling group, the scaling service will limit the number of instances to the maximum allowed. Since the maximum number of instances is set to 8 and the scaling rule tries to increase the number to 10, the scaling group will only scale up to 8 instances. Therefore, the number of ECS instances left in the scaling group when the scheduled task is activated will be eight.

Discussion
MRTASHOption: B

8 as Maximum number of instance

lhorisOption: A

A. Eight If as a result of executed a scaling rule, the number of ECS instances in a scaling group is less than the minimum size value or greater than the maximum size value of instances allowed for the group, auto-scaling will automatically adjust the number of instances to be added or removed, so that the minimum or maximum instance values cannot be exceeded.

Jackie911Option: C

Six as the task cannot run success Preset Max Capacity Overwrites Predicted Capacity: uses the preset maximum capacity as the maximum value for prediction tasks.

ryanzouOption: A

Must be eight.

ismail069Option: A

Should be 8, 8 is the maximum instance and cannot exceed

McdugOption: A

8 is the maximum instance and cannot exceed

borexKOption: A

answer should be 8 as maximum instance.

alien_kingOption: A

For example, let's say a scaling group is created and it's set to a maximum instance count of three ECS instances, and a minimum count of two and let's say that currently there are two ECS instances in the group and a scaling rule is added to add three more instances, well in this case, auto-scaling only adds one instance. This automatic adjustment stops the maximum instance count being exceeded and likewise, if the group now contains three instances and we have a scaling rule that is going to remove five instances, there are only three instances in the groups, so we can't possibly remove five and if we were to remove all three of those instances, then the size of the group would be zero, which is less than, in this scenario, the minimum size of two. https://cloudacademy.com/course/alibaba-auto-scaling-1247/scaling-rules/

DCTOption: B

Default value: Predicted Capacity Overwrites Preset Max Capacity.