Scaling Cooldowns
Scaling Cooldowns help you manage the frequency at which Auto Scaling scales your instances up or down. They provide a mandatory waiting period following a scaling action to prevent Auto Scaling from initiating subsequent scaling actions too quickly. This waiting period, known as a cooldown, allows your instances to warm up, execute essential configuration tasks, and begin serving web traffic before new scaling actions can be triggered. It can help you avoid scaling too aggressively and potentially incurring unnecessary costs or exhausting your EC2 instance limits. The default cooldown period is 300 seconds, but you can also set custom cooldown periods to better fit the needs of your application.
Guide to AWS Auto Scaling: Scaling Cooldowns
What are Scaling Cooldowns?
Scaling Cooldowns in AWS Auto Scaling are the periods of time that an Auto Scaling group waits before it can launch or terminate additional instances after a scaling activity. This feature of AWS ensures that the previous scaling activity has had enough time to take effect before a new one is initiated.
Importance of Scaling Cooldowns:
Without the Scaling Cooldowns, there could be a risk of launching or terminating more EC2 instances than needed, which can increase the costs. They essentially prevent the unnecessary fluctuations in the number of active instances.
How does it work?
When a scaling activity occurs, the Auto Scaling group is blocked from launching or terminating additional instances until the cooldown period has passed. The length of a cooldown period is configurable, and you may set different cooldown periods for scaling-out operations and scaling-in operations based on your specific requirements.
Exam Tips: Answering Questions on Scaling Cooldowns
- Always remember that you can set different cooldown periods for scaling-out and scaling-in operations.
- Be mindful of the fact that cooldowns prevent inefficiencies and unnecessary costs in your AWS infrastructure.
- Please note that, by default, a scale-in activity is blocked until a certain period has passed without any termination or launching of instances, which is defined by the cooldown.
- In scenarios where customized metrics are used, remember that cooldowns can be skipped if the instances are deemed unhealthy.
For more detailed understanding, refer to AWS Auto Scaling documentation.
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