Basic HAProxy Installation and configurations

What is HAProxy : 

HAProxy is a very fast and reliable solution for high availability, load balancing. It supports TCP and HTTP-based applications. Now a days all website need 99.9% of up-time required for their site. It's not possible with single server setup. So we need high availability environment which can easily manage single server failure. 



Installation of HAProxy

Installation of HAProxy is very easy follow the simple step to install

yum install haproxy -y

that's all only you need internet access. After that we have configure not configure just add some lines to the haproxy configuration file and need to start the service.

Configurations of HAProxy

Main configuration file is in /etc/haproxy/haproxy.cfg, in that we need to add some details that we need to access. Follow the steps below.

add the below mentioned line in EOD 

vi /etc/haproxy/haproxy.cfg

add below lines

######### Configure frondend Server ################

frontend webapp
        bind *:80

        default_backend webserver

######### Configure Backend Server #################

backend webserver
        balance roundrobin
        server  web1 10.0.0.11:80 check
        server  web1 10.0.0.12:80 check
        server  web1 10.0.0.13:80 check
        server  web1 10.0.0.14:80 check

Save & Exit

start the haproxy service and enable it for start when booting

In RHEL 6

service haproxy start
chkconfig haproxy on

In RHEL 7

systemctl start haproxy
systemctl enable haproxy

Note :

if your http service is running in 80 change it to other port. It will cause starting issue in haproxy.


Now try in web browser it will work.