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Serverless, HA (Elastic Beanstalk, On Premise Strategies, Load Balancers,…

- - - - You are charged $0.00001667 for every GB-second used
- - - - Logical collection of ECS resources - either ECS EC2 instances or Fargate instance
    - - Defines your application. Similar to a Dockerfile but for running containers in ECS. Can contain multiple containers
    - - Inside a task definition, it defines the individual containers a task uses. Control CPU and memory allocation and port mappings
    - - Single running copy of any containers defined by a task definition. One working copy of an application (e.g. DB and web containers)
    - - Allows task definitions to be scaled by adding tasks. Defines minimum and maximum values
    - - Storage for container images
  - - - Compliance requirements
      - Require broader customization
      - Require GPUs
- - - - Best suited for LB of HTTP or HTTPS traffic (L7)
    - - Best Suited for LB of TCP traffic (L4) where extreme performance is required.
    - - 可以有HTTP/HTTPS applications,也可以使用
      - 沒有target group概念
  - - - Allow you to bind 使用者的session 到特定的EC2 instance
      - can enable Sticky Session for application Load Balancers, but the traffic will be sent to at the Target Group level.
    - - Enables you to load balance across multiple availability zone
    - - Allow you to direct traffic to different EC2 instances based on the RUL contained in the request
- - - - Logical Component
        
        Webserver group
        
        Application group
        
        Database group
    - - Groups uses a launch template or a launch configuration as a configuration template for its EC2 instances
    - - Provides serveral ways for you to scale your Auto Scaling groups
      - Option
        
        Maintain current instance level at all time
        
        Scale manually
        
        Scale based on schedule (Proactive Scaling)
        
        Scale based on demand
        
        Use predictive scalling
  - - - Increase or decrease the current capacity of the group based on a target value for a specific metric
    - - Increase or decrease the current capacity of the group based on a set of scaling adjustments
      - 根據 CloudWatch Alarm 狀況的範圍，細分條件，執行不一樣的動作。像是 CPU 在 70-85 增加一台、超過 85 增加兩台
      - 有 warm-up time condition, 預防instance 需要長時間的boot up
    - - 根據 CloudWatch Alarm 狀況，執行一個動作
      - Increase or decrease the current capacity of the group based on a single scaling adjustment.