Web-tier demand changes by time of day.
Avoid running the maximum number of EC2 instances continuously and adjust capacity to demand.
Which architecture is most appropriate?
Configure Auto Scaling minimum and maximum capacity with a scaling policy that follows demand.
Detailed explanation
Credential lifetime does not control Auto Scaling capacity.
Credential lifetime does not control Auto Scaling capacity.
Auto Scaling adjusts instance count with demand and limits normal-time excess capacity.
Auto Scaling adjusts instance count with demand and limits normal-time excess capacity.
This charges for excess capacity during low-demand periods.
This charges for excess capacity during low-demand periods.
Manual changes react slowly to unexpected demand and increase operational work.
Manual changes react slowly to unexpected demand and increase operational work.
Check official documentation
Compare the following points with the official documentation.
EC2 Auto Scaling target trackingとcapacity設定の公式説明を確認する。
What to confirm
最小・最大容量と負荷追従によるコスト最適化を説明できる。
Key points
- EC2 Auto Scaling
- Minimum capacity
- Maximum capacity
Notes
- Environment: AWS公式Auto Scalingドキュメントの確認
- Confirm current AWS service behavior and pricing in the official documentation.
Foundation review
Capacity right-sizing
Minimum and maximum bounds prevent both underprovisioning and persistent excess capacity.
Scaling policy
A policy translates metrics or other signals into a capacity change.