Introduction to Auto Scaling in ASG

Auto Scaling Groups (ASG) in AWS allow you to automatically adjust the number of EC2 instances based on demand. There are three main categories of scaling policies:

1. Scheduled Actions
2. Predictive Scaling Policies
3. Dynamic Scaling Policies

Let's break down each of these in detail.

1. Scheduled Actions

Scheduled actions allow you to set a scaling action for a future time. This is useful when you can predict traffic increases, such as a scheduled promotion or a known increase in workload.

Key Features:

• Set desired, minimum, or maximum capacity for a future time.
• Define recurrence (e.g., every week, every hour).
• Useful for planned events where you expect higher demand.

Example Use Case:

You know that your application will experience high traffic next Saturday due to a planned marketing campaign. You can create a scheduled action to increase instance capacity before the event and scale it down afterward.

2. Predictive Scaling Policies

Predictive scaling uses machine learning to forecast future traffic and adjust scaling accordingly.

How It Works:

1. AWS analyzes past usage patterns over a specific period.