신입 웹 개발자일 때 알았더라면 좋았을 기본 웹 아키텍처 개념

Domain Name Server

• enables WWW
• changes domain name to ip address

Load Balancer

• Horizontal scaling is always better than vertical scaling
  • prevent service interruption
  • even you can scale server vertically, there is an limit
• enables horizontal scaling
  • by distributing requests to the duplicated server

Web Application Server

• executes business logic and sends responds through HTML
• Should choose proper server language (Node.js, Ruby, PHP, Scala, Java, C#, .NET, ...) and its web MVC framework (Express for Node.js, Ruby on Rails, Play for Scala, Laravel for PHP)

Database Server

• struct, insert, find, modify, delete, and compute data
• Each backend service could have distinct different database
• SQL vs NoSQL

Cache Service

• provide key-value data that could be found in O(1)