Load Balancing

  • Client to gateway: DNS parse domain to different ip addresses. (If we have multiple data centers, DNS will find the geographically closest data center)

  • Gateway to web server: reverse proxy

  • web server to application server: connection pool

  • database load balancing: partition / sharding

How to distribute traffic:

  • random, round-robin

  • min connection count

  • min latency

  • based on ip.

What if load balancer crashed?

TODO

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