How to Setup HAProxy as Load Balancer for Http on CentOS 8


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We need one Haproxy-server( & two client-server: client1( & client2(, Make sure all are accessible

Login into both client servers – &

Step 1: Install the Apache Server on both Client Servers :

[root@client ~]# yum install httpd -y

  Start & Enable their Services:

[root@client ~]# systemctl start httpd
[root@client ~]# systemctl enable httpd
[root@client ~]# systemctl status httpd

Now, need to create test pages that we will use later on to test out the HAProxy setup :

--- Client Server 1 ---
[root@client1 ~]# vim /var/www/html/index.html
< h1> This is Fosnix's Client Server 1 < /h1>
--- Client Server 2 ---
[root@client2 ~]# vim /var/www/html/index.html
< h1> This is Fosnix's Client Server 2 < /h1>

For Testing:  Open your browser and Type your Client’s Server-IP as shown below-

Login into a Haproxy server – 

Step 2: Installing and Configuring HAProxy Server on CentOS 8

[root@fosnix ~]# yum install haproxy -y

  Start & Enable their Services:

[root@fosnix ~]# systemctl start haproxy
[root@fosnix ~]# systemctl enable haproxy

Now install & configure rsyslog –

[root@fosnix ~]# yum install rsyslog -y
[root@fosnix ~]# vim /etc/rsyslog.conf

Search & uncomment the below lines:

$ModLoad imudp
$UDPServerRun 514

Add the below lines in the same file

# HAProxy Logging
local2.* /var/log/haproxy.log

Save & Exit

Restart the rsyslog service 

[root@fosnix ~]# systemctl restart rsyslog

Now, Configure Haproxy file

[root@fosnix ~]# vim /etc/haproxy/haproxy.cfg

Add the below lines in the file
In Stats auth fosnix:admin@123 replace fosnix with your username and admin@123 with your password

# HAProxy Load Balancer for Apache Web Server
frontend http-balancer
default_backend web-servers
backend web-servers
mode http
balance roundrobin
stats enable
stats auth fosnix:admin@123
server client1 check
server client2 check

Now, Restart the Haproxy

[root@fosnix ~]# systemctl restart haproxy

If your firewall is on then allow the HTTP Services by the below commands:

[root@fosnix ~]# firewall-cmd --permanent --add-service=http
[root@fosnix ~]# firewall-cmd --permanent --add-service=https
[root@fosnix ~]# firewall-cmd --reload

Now,  Open your browser and Type your Haproxy Server-IP with port “:80”, eg – as shown below-

Browse http://YOUR-SERVER-IP/haproxy?stats
Enter your login-ID

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