Skip to content
AWS SAA

088 ASG Scaling Policy

Scaling Policy Type

Dynamic Scaling

Target Tracking Scaling

  • simple
  • ex) I want the average ASG CPU to stay at 40%

Simple/Step Scaling

  • When CloudWatch alarm is triggered, add 2 units
  • When CloudWatch alarm is triggered, then remove

Scheduled Scaling

Anticipate a scaling based on known usage patterns

Predictive Scaling

predictive scaling

continuously forecast load and schedule scaling ahead

Good Metrics

CPUUtilization (Average CPU)

RequestCountPerTarget

Average Network In/Out

Any custom metric

Scaling Cooldown

After scaling activity happens, you are in Cooldown period (default 300 seconds)

During Cooldown period, ASG will not launch or terminate additional instances

Use a ready-to-use AMI to reduce config time in order to serve request faster and reduce Cooldown period