How to configure HAProxy to redirect multiple domains

Follow the below steps to configure HAproxy to redirect multiple domains.
Step 1: Install the haproxy package if already not installed:

[root@linuxcnf ~]# yum install haproxy

Step 2: Take a backup of original configuration file of haproxy:

[root@linuxcnf ~]# cp -p /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg-ORI

Step 3: Remove existing contents from the file and put the below contents:

[root@linuxcnf ~]# vi /etc/haproxy/haproxy.cfg-ORI #--------------------------------------------------------------------- # Example configuration for a possible web application.  See the # full configuration options online. # #   http://haproxy.1wt.eu/download/1.4/doc/configuration.txt # #--------------------------------------------------------------------- #--------------------------------------------------------------------- # Global settings #--------------------------------------------------------------------- global     # to have these messages end up in /var/log/haproxy.log you will     # need to:     #     # 1) configure syslog to accept network log events.  This is done     #    by adding the '-r' option to the SYSLOGD_OPTIONS in     #    /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     #   /etc/sysconfig/syslog     #     #    local2.*                       /var/log/haproxy.log     #     log         127.0.0.1 local2

chroot      /var/lib/haproxy     pidfile      /var/run/haproxy.pid     maxconn   4000     user        haproxy     group      haproxy     daemon     # turn on stats unix socket     stats socket /var/lib/haproxy/stats #--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults     mode                    http     log                       global     option                   httplog     option                   dontlognull     option                   http-server-close     option forwardfor     except 127.0.0.0/8     option                   redispatch     retries                   3     timeout http-request   10s     timeout queue          1m     timeout connect        10s     timeout client          1m     timeout server         1m     timeout http-keep-alive 10s     timeout check          10s     maxconn                3000 #--------------------------------------------------------------------- # main frontend which proxys to the backends #--------------------------------------------------------------------- frontend http-in         bind *:80         acl host_blog hdr(host) -i blog.linuxcnf.com         acl host_www hdr(host) -i www.linuxcnf.com

use_backend blog_site if host_blog         use_backend www_site if host_www #--------------------------------------------------------------------- # Backend for Blog Server #--------------------------------------------------------------------- backend blog_site         balance leastconn         option httpclose         option forwardfor         cookie JSESSIONID prefix         server blog1 192.168.43.18:9001 cookie A check #--------------------------------------------------------------------- # Backend for www Server #--------------------------------------------------------------------- backend www_site         balance leastconn         option httpclose         option forwardfor         cookie JSESSIONID prefix         server www1 192.168.43.19:9002 cookie A check #---------------------------------------------------------------------          [root@linuxcnf ~]#

Note: Change the configuration as per environments i.e. domain URLs, backend server IP addresses and ports.

Step 4: Finally, start haproxy service and enable it on system startup.

[root@linuxcnf ~]# service haproxy start [root@linuxcnf ~]# chkconfig haproxy on

Step 5: verify the configuration using domain URLs.