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Anti-overload techniques

To partially overcome above average load limits and to prevent overload, most popular web sites use common techniques like:

  • Managing network traffic, by using:
    • Firewalls to block unwanted traffic coming from bad IP sources or having bad patterns
    • HTTP traffic managers to drop, redirect or rewrite requests having bad HTTP patterns
    • Bandwidth management and traffic shaping, in order to smooth down peaks in network usage
  • Deploying web cache techniques
  • Using different domain names to serve different (static and dynamic) content by separate web servers, e.g.:
    • ... different domain names or computers to separate big files from small and medium-sized files; the idea is to be able to fully cache small and medium-sized files and to efficiently serve big or huge (over 10 - 1000 MB) files by using different settings
    • Using many internet servers (programs) per computer, each one bound to its own network card and IP address
    • Using many internet servers (computers) that are grouped together behind a load balancer so that they act or are seen as one big web server
    • Adding more hardware resources (i.e. RAMdisks) to each computer
    • Tuning OS parameters for hardware capabilities and usage
    • Using more efficient computer programs for web servers, etc.
    • Using other workarounds, especially if dynamic content is involved

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