Amazon EC2 Auto-Scaling Concepts
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External
- Auto-scaling User Guide http://docs.aws.amazon.com/autoscaling/latest/userguide/
Internal
Overview
Auto-scaling is an Amazon EC2 functionality that insures that an optimal number of EC2 instances are started and maintained running, to handle the load of a specific application. The EC2 instances whose number is controlled this way are part of an auto-scaling group.
Auto-scaling allows for scaling policies, which control the number of active instances as the demand on the application increases or decreases.
Auto-Scaling Group
Auto-scaling ensures that the number of EC2 instances in an auto-scaling group does not go below a minimum size and above a maximum size. The group has a desired capacity.