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Do I need to have a HAProxy TCP / HTTP Load Balancer when I already have AWS ELB?

Let's say I have 20 servers on Amazon AWS, and I also have AWS ELB setup for these servers. I heard that HAProxy is a reliable and fast TCP / HTTP load balancer, so the question is:

  • Do I need to install HAProxy in every instance of EC2 while I have AWS ELB?
  • What is the advantage of using both ELB and Haproxy at the same time?

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4 answers

There are several scenarios in which people choose their own load balancing solution, such as HAProxy, than ELB:

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ELB Haproxy.

When a client uses my web services with a unique IP, ELB redirects all its requests to the same hosts. It does not scale. (I assumed it was a hash from src ip or something like that).

Haproxy has another balancing algorithm.

I hold ELB for HA (1 haproxy / availability zone). And each haproxy instance redistributes zone zone servers

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