CloudFront

An Content Distribution Network (CDN) creates Cached copies of your website at various Edge Locations around the world

CDN :

• CDN is a distributed network of servers which delivers web pages and content to users based on their geographical location, the origin of the web page, and a content delivery server

  

• Can be used to deliver an entire website including static, dynamic and streaming

• Requests for content are served from the nearest Edge Location for the best possible performance

Core Components :

• Origin :
  The location where all of origin files are located. (ex: S3 bucket, EC2 instance, ELB, Route53)
• Distribution :
  A Collection of Edge locations that defines how cached content should behave
• Edge Location :
  The location where web content will be cached. (Differ from AWS Region or AZ)

Distribution

More detail in distribution

• 價錢取決於 Price Class. Edge Location 越多越貴
• Distributions :
  • Web (for website)
  • RTMP (for streaming media) : will not supported in 12/2020
• Behaviours:
  • Redirect to HTTPs
  • Restrict HTTP Methods
  • Restrict Viewer Access
  • Set TTLs
• Invalidations :
  You can manually invalidate cache on specific files via invalidations
• Error Pages
  You can serve up custom error pages. (eg: 404)
• Restrictions
  You can use Geo Restriction to blacklist or whitelist specific countries