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HA Architecture (Load Balancers (Features (routing (Sticky Sessions enable…

- - - - Intelligence routing (allow to config if/else to redirect to which web server instance)
      - operate at Layer 7
    - - TCP traffic where extreme performance is required (million requests per second)
      - operate at Layer 4
    - - cost effective
      - legacy ELB
      - If application stop responding, ELB response with 504 error code => this could be either Web Server or DB Server issue
      - it can only be used to distribute traffic to a single URL
  - - - Sticky Sessions enable your users to stick to the same EC2 instance (useful when u want to store information locally to that instance)
      - Cross Zone Load Balancing enable you to load balance across multi AZ
      - Path patterns allow you to direct traffic to different EC2 instance base on URL path