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www.loadbalancer.org
What is a load balancer? A load balancer is simply a device that sends internet traffic to a group of application servers with an even load distribution. Their key advantage over DNS is that they can ensure the server is responding and that it's actually giving the correct response! You'll find further clarification in our 'What is a load balancer?' blog. Before load balancers we used DNS servers
If you use HAProxy as the load balancer then all of the backend servers see the traffic coming from the IP address of the load balancer. TPROXY allows you to make sure the backend servers see the true client IP address in the logs. NB. Standard Kernel builds didn't support TPROXY but as of 2.6.28 they all now do support it. Ps. A MUCH easier alternative is inserting the clients ip in the x-forward
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