This guide will step you through the process of installing HAProxy on CentOS 6. To install HAProxy on CentOS 6 you first need to set up your installation to use the epel software repository. HAProxy is not available in the default CentOS repositories. (Note: All commands below require root privileges.) rpm -Uvh You can now install haproxy. Yum -y install haproxy Now that HAProxy is installed, you can configure the haproxy.cfg file.

Vi /etc/haproxy/haproxy.cfg Once you have configured HAProxy, its time to start the service. Service haproxy start By default HAProxy wont be set to run at system startup.

To enable HAProxy to always start when the PC boots up, run the following: chkconfig haproxy on For more information on configuring HAProxy, please check my other howto articles.

Step 4: Configuring HAProxy Global Settings 7. Now, here we need to set default variables in ‘ /etc/haproxy/haproxy.cfg‘ for HAProxy.

How to Install HAProxy HTTP Load Balancer on CentOS Installing HAProxy CentOS 7 As a fast developing open source application, the HAProxy that is available for install in the CentOS default repositories might not be the latest release.

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The changes needs to make for default under default section as follows, Here some of the changes like timeout for queue, connect, client, server and max connections need to be defined. In this case, I suggest you to go through the HAProxy man pages and tweak it as per your requirements. #--------------------------------------------------------------------- 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 20 timeout queue 86400 timeout connect 86400 timeout client 86400 timeout server 86400 timeout http-keep-alive 30 timeout check 20 maxconn 50000. HAProxy Default Settings 8. Then we need to define front-end and back-end as shown below for Balancer in ‘ /etc/haproxy/haproxy.cfg‘ global configuration file.

Make sure to replace the IP addresses, hostnames and HAProxy login credentials as per your requirements. Frontend LB bind 192.168.0.125:80 reqadd X-Forwarded-Proto: http default_backend LB backend LB 192.168.0.125:80 mode http stats enable stats hide-version stats uri /stats stats realm Haproxy Statistics stats auth haproxy:redhat # Credentials for HAProxy Statistic report page. Balance roundrobin # Load balancing will work in round-robin process.

Option httpchk option httpclose option forwardfor cookie LB insert server web1-srv 192.168.0.121:80 cookie web1-srv check # backend server. Server web2-srv 192.168.0.122:80 cookie web2-srv check # backend server. Server web3-srv 192.168.0.123:80 cookie web3-srv check # backend server. Server web4-srv 192.168.0.124:80 check backup # backup fail-over Server, If three of the above fails this will be activated. HAProxy Global Configuration 9. After adding above settings, our load balancer can be accessed at ‘ with HTTP authentication using login name as ‘ haproxy‘ and password ‘ redhat‘ as mentioned in the above settings, but you can replace them with your own credentials.

After you’ve done with the configuration, make sure to restrat the HAProxy and make it persistent at system startup on RedHat based systems. # service haproxy restart # chkconfig haproxy on # chkconfig --list haproxy. Start HAProxy For Ubuntu/Debian users to need to set “ ENABLED” option to “ 1” in ‘ /etc/default/haproxy‘ file. ENABLED=1 Step 5: Verify HAProxy Load Balancer 11.

Now it’s time to access our Load balancer URL/IP and verify for the site whether loading. Let me put one HTML file in all four servers. Create a file index.html in all four servers in web servers document root directory and add the following content to it. Tecmint HAProxy Test Page My HAProxy Test Page Welcome to HA Proxy test page! There should be more here, but I don't know what to be write:p. Made 11 January 2015 by Babin Lonston.