The Configuration =

• Load Balancer: <192.168.0.2> // will be our haproxy server
• Web Server 1: <192.168.0.10> // web application server 1
• Web Server 2: <192.168.0.20> // web application server 2
• Admin Panel Port 8080: <192.168.0.2> // Statistics Panel on port 8080

                                       Web Server 1
Load Balancer <
                                       Web Server 2

Step 1: Get and Install haproxy

We’ll be using the 1.3.17 src files to install haproxy. You can get them from http://haproxy.1wt.eu/

wget http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.17.tar.gz 

cd haproxy-1.3.17 

make TARGET=linux26 

cp /path/to/haproxy-1.3.17/examples/haproxy.init /etc/init.d/haproxy 

chmod +x /etc/init.d/haproxy

Step 2: Create some users for security

We’re going to add a haproxy user and run it in a chroot jail. Be sure to read up on other security measures for your server.

useradd haproxy 

mkdir /var/chroot/haproxy 

chown haproxy:haproxy /var/chroot/haproxy 

chmod 700 /var/chroot/haproxy

Step 3: Configure /etc/haproxy.cfg

This will be a simple load balancing. The HAProxy server will listen to 1 IP and distribute to 2 servers.

global
maxconn	 10000 # Total Max Connections.
log	 127.0.0.1	local0
log	 127.0.0.1	local1 notice
daemon
nbproc	 1 # Number of processes
user	 haproxy
    	group	 haproxy
    	chroot	 /var/chroot/haproxy

defaults
log	 global
option tcplog
mode	 tcp
clitimeout	60000
srvtimeout	30000
contimeout	4000
retries	 3
redispatch
option	 httpclose 

listen	load_balanced	192.168.0.2:80,192.168.0.2:443
balance	 source
option	 ssl-hello-chk
option	 forwardfor

server webserver1 192.168.0.10 weight 1 maxconn 5000 check
server webserver2 192.168.0.20 weight 1 maxconn 5000 check

listen  admin_stats 192.168.0.2:8080
mode	 http
stats uri	/my_stats
stats realm 	Global\ statistics
stats auth 	username:password

Start up HAProxy by /etc/init.d/haproxy start.

Step 4: Configuring logging

Edit /etc/sysconfig/syslog

SYSLOGD_OPTIONS=”-m 0 -r”

Edit /etc/syslog.conf. Add the following:

local0.* /var/log/haproxy.log
local1.* /var/log/haproxy-1.log

Restart Syslog

service syslog restart