Load Balancer Types

411 2018-07-23 11:54

Generally speaking, load balancers fall into three categories:

  • DNS Round Robin (rarely used): clients get a randomly-ordered list of IP addresses.
    • pros: easy to implement and free
    • cons: hard to control and not responsive, since DNS cache needs time to expire
  • Network (L3/L4) Load Balancer: traffic is routed by IP address and ports.L3 is network layer (IP). L4 is session layer (TCP).
    • pros: better granularity, simple, responsive
  • Application (L7) Load Balancer: traffic is routed by what is inside the HTTP protocol. L7 is application layer (HTTP).
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