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Designing a software based load balancer

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http://serverfault.com – Hello to all Server fault users, I am new to this website but have constantly been using the mother website, stackover flow. Well to begin with, i would like to design a load balancer for the organization i am working for. As i am very new to this whole, idea about load balancing and networks. I am finding it very difficult to start my project. I did a lot of research on already existing load balancer and found some(HAPROXY,NGINX) that could solve my problems, but the point is, I am still in a dilemma if they could answer the following requirements of mine: The client and server in my ar (HowTos)

u85500's picture
Submitted by u85500 on 06/25/2012

Stories similar to Designing a software based load balancer

I have heard people say "oh that server is off the load balancer so you can run that expensive script on it".

What implications does a server off the load balancer have? Fundamental to answering this, I understand load balancing, but I don't know what the dynamics of a system with 5 servers (4 on the load balancer) has.

Thanks

I have 4 nginx-powered image servers on their own subdomains which users would access at random. I decided to put them all behind a HAProxy load balancer to improve the reliability and to see the traffic statistics from a single location.

Currently I'm using a Cisco CSS hardware load balancer. From the web server's point of view, the end-user's IP address is stamped on all traffic as if the load balancer weren't even present.

I'm now looking at software replacements such as HAProxy, Pound, or AWS ELB. They all have one thing in common: the web server receives the load balancer's IP instead of the end-user's.

Hello Forum:

I am working on a load balancing project. The type of routing I am implementing is direct routing (LVS-DIR). The following is a script that sets up the Linux Virtual Server (LVS) or the load balancer:

#!/bin/bash #description: manages load balancer #chkconfig: 35 20 80 #processname: lvsdr . /etc/rc.d/init.d/functions

I'm setting up a load balancer with failover and I'm confused on how to properly set it up. The load-balancer is balancing web traffic to web-servers on a LAN network.

My setup is the following:

I have one incoming external IP address, that ethernet cable goes to a switch. One output from the switch is going to load_balancer_1 and the second output going to load_balancer_2.

When I try to use curl (or wget, lynx, etc) to connect from a server on our local network to our website, which is on a local server behind a CoyotePoint load balancer, curl fails. Ping does not have this problem.

When I curl directly to any of the servers behind that load balancer (from and to the same local network), I also have no problem.

Does any one know a simple but good load balancer that can handle 2000 concurrent connections through http? It will be installed on ubuntu server or you can recommend a OS that it will work better with.

Thank you.

I have tried:

HAproxy

Update:

I host a website that has scripts on it. I get 300+ request per second. I will be spreading the load on 3 servers running ubuntu.

We have a aws load balancer. The load balancer uses the TCP connections 443 to encrypt the data.

Since the load balancer encrypts the IP of the client, in our apache log file we can see only the IP of the load balancer rather then the client. Even though we have used %{X-Forwarded-For}i in our log format.

Is there any way to handle this issue?

We are using aws load-balancer. There is one machine which is behind the load balancer. So for this reason we have configured apache2.conf such that %h are replaced by %{X-Forwarded-For}i in our file.

But something wired is happening. We can't see any ip of the client in the logs section.

But when we change back from %{X-Forwarded-For}i to %h all client ip's are visible in the log section.