ASGs

Question 1

What does ASG stand for?

Answer 1

Auto-Scaling Group

Question 2

What are the different scaling options for ASGs?

Answer 2

• Maintain current instance levels at all times
• Scale manually
• Scale based on a schedule
• Scale based on demand
• Use predictive scaling

Question 3

What is the difference between scaling out and scaling up?

Answer 3

• Scale Out = More stuff (e.g. more EC2 instances in an ASG), for better parallelism or for HA
• Scale Up = Better stuff (e.g. upgraded EC2 instances) for better performance

Question 4

In the context of ASGs, what is a Lifecycle hook?

Answer 4

Lifecycle hooks enable you to perform custom actions by pausing instances as an Auto Scaling group launches or terminates them.

_{(Source: https://docs.aws.amazon.com/autoscaling/ec2/userguide/lifecycle-hooks.html)}