-- HAProxy (High Availability Proxy) is an open-source load-balancer which can load balance any TCP service. HAProxy is a free, very fast and reliable solution that offers load-balancing, high-availability, and proxying for TCP and HTTP-based applications.

Step: 1. Set Hostname (On All Servers) :

# vi /etc/sysconfig/network

server1.kousik.com

-- Save & Quit (:wq)

# hostname server1.kousik.com

Step: 2. Bind Hosts File (On All Servers) :

# vi /etc/hosts

## IP's of HaProxy ##
192.168.72.181    server1.kousik.com    server1

## IP's of Web Servers ##
192.168.72.182    www1.kousik.com        www1
192.168.72.183    www2.kousik.com        www2

-- Save & Quit (:wq)

 Step: 3. Stop Firewall & Disable Selinux (On All Servers) :

# service iptables stop
# chkconfig iptables off

# vi /etc/sysconfig/selinux

SELINUX=disabled

-- Save & Quit (:wq)

Step: 4. Install NTP Server For Time Synchronization (On All Servers) :

# yum -y install ntp ntpdate
# service ntpd restart
# chkconfig ntpd on
# ntpdate pool.ntp.org

Step: 5. Reboot the System (On All Servers) :

# init 6

Step: 6. Copy hosts file to Other Server :

# scp /etc/hosts www1:/etc/
# scp /etc/hosts www2:/etc/

Step: 7. Web Server Configurations :

-- On Both Web Servers :

# yum -y install httpd
# service httpd start
# chkconfig httpd on

-- On Web1 :

# echo "<h1>www1.kousik.com</h1>" > /var/www/html/index.html

-- On Web2 :

# echo "<h1>www2.kousik.com</h1>" > /var/www/html/index.html

-- On LB (HAP) :

# yum -y install epel-release
# yum -y install haproxy
# yum -y remove httpd

# mv /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
# vi /etc/haproxy/haproxy.cfg

#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------

global

    log 127.0.0.1    local0
    log 127.0.0.1    local1 notice
    #log loghost    local0 info
    maxconn 4096
    #debug
    #quiet
    user haproxy
    group haproxy

#---------------------------------------------------------------------
# Defaults that are optimized for a Cloud Servers based
# Infrastructure.
#---------------------------------------------------------------------

defaults

    log global
    mode http
    option httplog
    option dontlognull
    retries 3
    option    redispatch
    maxconn        20000
    contimeout   5000
    clitimeout      50000
    srvtimeout     50000

#---------------------------------------------------------------------
# HTTP Default Webfarm
#---------------------------------------------------------------------

listen webfarm 0.0.0.0:80

    mode http
    stats enable
    stats uri /haproxy?stats
    stats realm Haproxy\ Statistics
    stats auth admin:redhat            # Username is 'admin' & Password is 'redhat'
    balance roundrobin
    cookie JSESSIONID prefix
    option httpclose
    option forwardfor
    option httpchk HEAD /check.txt HTTP/1.0
    server Web01 192.168.72.182:80 cookie A weight 50 check            # Webserver1 IP Address.
    server Web02 192.168.72.183:80 cookie B weight 50 check            # Webserver2 IP Address.

-- Save & Quit (:wq)

# chkconfig haproxy on
# service haproxy start

Step: 8. Open Browser & Type for Statistics :

http://192.168.72.181/haproxy?stats
User: admin
Pass: redhat

Step: 9. Open Web Browser & Check Load Balancing :

http://192.168.72.181


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