Design CDN

functional requirements

• retrieve
• request
• deliver
• search
• update
• delete

non-functional

• available
  • if proxy fails, can be redirected
  • if origin server fails, has back ups
• performance
  • proxy server content via RAM
• scalability
  • adding number of reading replica and proxy servers
• reliable and secure

Design a CDN

• Clients
• Routing system - direct client to nearest CDN facility
• Scrubber server - routing away the malicious traffic
  • such as DDoS attack
• Proxy server - server content from RAM to user
• Distribution system - distribute contents to all proxy servers
• Origin servers
• Management system