Auto Scaling Groups

• You can perform EC2 auto scaling based on SQS queue also

• Scheduled scaling

  • Schedule according to predictable load changes

  • Known holidays, know history

  • Ex: Every week the traffic to your web application starts to increase on Wednesday, remains high on Thursday, and starts to decrease on Friday, you can configure a schedule for Amazon EC2 Auto Scaling to increase capacity on Wednesday and decrease capacity on Friday

• Dynamic Scaling

  • Reactive in nature

  • Target tracking scaling policy

    • unpredictable workloads and traffic spikes

    • To keep the average aggregate CPU utilization of your Auto Scaling group at X percent

• Predictive Scaling

  • regular patterns of traffic increases (business hours) and applications that take a long time to initialize

  • potentially save you money on your EC2 bill by helping you avoid the need to overprovision capacity

  • Cyclical traffic, such as high use of resources during regular business hours and low use of resources during evenings and weekends

  • Recurring on-and-off workload patterns, such as batch processing, testing, or periodic data analysis

  • Applications that take a long time to initialize, causing a noticeable latency impact on application performance during scale-out events

• suspend-resume feature

  • temporarily pause scaling activities

  • useful when you are making a change or investigating a configuration issue