Configure HTTP load balancer with HAProxy on Debian 7

HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones. Over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream Linux distributions, and is often deployed by default in cloud platforms

Prerequisites

Make sure you have installed webserver and working fine

Install HAProxy on Debian

create a new file called "backports.list" in /etc/apt/sources.list.d

#cd /etc/apt/sources.list.d

#vi backports.list

Add the following lines

deb http://cdn.debian.net/debian wheezy­backports main

Save and exit the file

Update the source list and install HAProxy

# apt­ get update

# apt ­get install haproxy

Configure HAProxy

In this tutorial, we assume that there are two HTTP web servers up and running with IP addresses 172.30.40.2 and 172.30.40.3. We also assume that the load balancer will be configured at a server with IP address 172.30.40.4.haproxy configuration file located at /etc/haproxy/haproxy.cfg.

First we need to backup the the existing config

# cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.orig

# cat /dev/null > /etc/haproxy/haproxy.cfg

Add the following configuration

global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
maxconn 4096
user haproxy
group haproxy

defaults
log global
mode http
option httplog
option dontlognull
retries 3
redispatch
maxconn 2000
contimeout 5000
clitimeout 50000
srvtimeout 50000

listen webfarm 172.30.40.4:80
mode http
stats enable
stats uri /haproxy?stats
stats realm Haproxy\ Statistics
stats auth haproxy:stats
balance roundrobin
cookie LBN insert indirect nocache
option httpclose
option forwardfor
server webA 172.30.40.2:80 cookie node1 check
server webB 172.30.40.3:80 cookie node2 check

and now we need to ENABLE the haproxy in /etc/default/haproxy

# vi /etc/default/haproxy

and set ENABLE=1

to start haproxy just run:

# service haproxy start

HAproxy Statistics

In this configuration we enable the statistics of haproxy, you can acsses from you browser by enter

http://172.30.40.4/haproxy?stats

The user and the password is like you type in the configuration in "stats auth haproxy:stats"

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