Day-25: Auto Scaling Groups (ASG)

🔹 What is Auto Scaling?

Auto Scaling automatically adjusts the number of EC2 instances in your application based on demand, ensuring:

• High availability,
• Performance efficiency, and
• Cost optimization.

It helps you add instances when traffic increases and remove instances when traffic decreases.

🔹 Key Components

1. Launch Template / Launch Configuration – Defines the instance type, AMI, key pair, security groups, etc.
2. Auto Scaling Group (ASG) – A collection of EC2 instances managed together.
3. Scaling Policies – Rules to decide when to scale in/out.
4. CloudWatch Alarms – Used to trigger scaling actions based on metrics like CPU utilization or network load.

🔹 How It Works

1. You define minimum, maximum, and desired number of EC2 instances.
2. Based on CloudWatch metrics or schedules, AWS automatically:
   • Scales out (adds instances) when demand rises.
   • Scales in (terminates instances) when demand drops.

🔹 Types of Scaling