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ECS Service Auto Scaling

  • Automaticall increase/descrease the desired number of ECS tasks
  • Amazon ECS Auto Scaling uses AWS Application Auto Scaling
    • ECS Service Average CPU Utilization
    • ECS Service Average Memory Utilization - Scale on RAM
    • ALB Request Count Per Target - metric coming from the ALB
  • Target Tracking - scale based on target value for a specific CloudWatch metric
  • Step Scaling - scale based on a specific CloudWatch Alarm

  • Scheduled Scaling - scale based on a specific date/time (predictable changes)

  • ECS Service Auto Scaling (task level) != EC2 Auto Scaling (EC2 instance level)

  • Fargate Auto Scaling is much easier to setup (because it's serverless)

Auto Scaling EC2 Instances

  • Accomodate ECS Service Scaling by adding underlying EC2 instances
  • Auto Scaling Group Scaling
    • Scale your ASG based on CPU utilization
    • Add EC2 instances over time
  • ECS Cluster Capacity Provider
    • Used to automatically provision and scale the infrastructure for your ECS tasks
    • Capacity Provider paired with an Auto Scaling Group
    • Add EC2 Instances when you're missing capacity (CPU,RAM)