Web Servers Load balancing with HAProxy

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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. See more at http://haproxy.org

This tuturial, I use hostname and ip as follows:
10.11.218.250 (haproxy)
10.11.218.251 (srv-web01)
10.11.218.252 (srv-web02)

Installing HAProxy server
#yum install haproxy [RedHat Systems]
#apt-get install haproxy [Debian Systems]

Configuring HAProxy Server
Opening the main HAProxy configuration file ‘/etc/haproxy/haproxy.cfg’ and editing the following content:


#----------------------------------------------------------------

# Global settings
global


# need to:

# to have these messages end up in /var/log/haproxy.log you will
 #


# by adding the '-r' option to the SYSLOGD_OPTIONS in

# 1) configure syslog to accept network log events. This is done
 # /etc/sysconfig/syslog
 #


# /etc/sysconfig/syslog

# 2) configure local2 events to go to the /var/log/haproxy.log
 # file. A line like the following can be added to
 #
 # local2.* /var/log/haproxy.log
 #


# turn on stats unix socket

log 127.0.0.1 local2
    chroot /var/lib/haproxy
    pidfile /var/run/haproxy.pid
    maxconn 4000
    user haproxy
    group haproxy
    daemon


log                     global

stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------
# Defaults settings
defaults
    mode                    http


option                  redispatch

option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    retries                 3


timeout check           20

timeout http-request    20
    timeout queue           86400
    timeout connect         86400
    timeout client          86400
    timeout server          86400
    timeout http-keep-alive 30


frontend lb_in

maxconn                 50000
#----------------------------------------------------------------
#main frontend which proxys to the backends




bind *:80


default_backend lb_http



backend lb_http



balance roundrobin

mode http


server srv-web01 10.11.218.251:80 check

server srv-web02 10.11.218.252:80 check



#-------------------------- THE END -----------------------------

Restarting and verify HAProxy Load Balancer

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