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Auto Scaling keeps checking the health of the EC2 instances launched by it at regular intervals. If an instance is observed as unhealthy, Auto Scaling will automatically terminate the instance and launch a new healthy instance. Thus, it maintains the number of instances as per the Auto Scaling group configuration. Reference: http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AutoScalingLifecycleHooks.html
When an instance launched by Auto Scaling becomes unhealthy, Auto Scaling is designed to automatically respond to maintain the desired number of healthy instances. This is achieved through the concept of health checks.
Auto Scaling regularly monitors the health of the instances it manages by performing health checks. The health check mechanism determines if an instance is considered healthy or unhealthy based on predefined criteria, such as the response to a specific network request.
If an instance fails the health check and is deemed unhealthy, Auto Scaling takes action to replace it. It terminates the unhealthy instance and launches a new instance to ensure that the desired capacity and health of the Auto Scaling group are maintained.
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