To install and configure HAProxy loadbalancer on Ubuntu 18.04 we will consider three system as follows

1. One is web server1>IP Address: 192.168.64.137>Hostname:system1.osrader.com
2. Two is web server2>IP Address: 192.168.64.139>Hostname:system2.osrader.com
3. HAproxy loadbalancer>IP Address: 192.168.64.141>Hostname:loadbalancer.osrader.com

Step 01: Make sure that system1 and system2 has apache2 installed. Please use below command for Ubuntu 18.04 to install apache2 for both system1 and system2.

$ sudo apt-get update
$ sudo apt-get install apache2
$sudo ufw app list (to check list of application profiles)

$sudo ufw allow 'Apache'
$sudo ufw status (for verifying)
$sudo systemctl status apache2 (to check service status)

Now type system1 and system2 IP address on web browser and visit apach2 default web page.

You can change default index.html file from /var/www/html.
You can also change /etc/hosts file to visit web page by host name, like I did.

Step 02:

We will now configure loadbalancer machine. At first we will install HAProxy by executing below commands

$ sudo add-apt-repository ppa:vbernat/haproxy-1.7
$ sudo apt-get update
$ sudo apt-get install haproxy

Step 03:

Edit haproxy default configuration file /etc/haproxy/haproxy.cfg and start configuration.

$ vim /etc/haproxy/haproxy.cfg

At the end of the file we will add folowing information

frontend Local_Server
bind 192.168.64.141:80
mode http
default_backend webserver

backend webserver
mode http
balance roundrobin
option forwardfor
http-request set-header X-Forwarded-Port %[dst_port]
http-request add-header X-Forwarded-Proto https if { ssl_fc }
option httpchk HEAD / HTTP/1.1rnHost:localhost
server system1.osradar.com 192.168.64.137:80
server system2.osradar.com 192.168.64.139:80

Step 04:

To verify the configuration

$ sudo haproxy -c -f /etc/haproxy/haproxy.cfg

It will show output : Configuration file is valid

Step 05:

Restart HAproxy

$ sudo service haproxy restart

Now type 192.168.64.141(loadbalancer system ip) on web browser and refresh 2/3times. You will see HAProxy loadbalancer is working.

Thank you.

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To install and configure HAProxy loadbalancer we will consider below senario

1. One is web server1>IP Address: 192.168.248.132>Hostname:system1.osradar.com
2. Two is web server2>IP Address: 192.168.248.133>Hostname:system2.osradar.com
3. HAproxyloadbalancer>IPAddress:192.168.248.134>Hostname:loadbalancer.osradar.com

First make sure that you systems has above host name and IP Address.

Step 01: To check hostname (for three systems)
#hostnamectl status
Static hostname: system1.osradar.com
Static hostname: system2.osradar.com
Static hostname: loadbalancer.osradar.com

Step 02: To Check IP Address (for three system)
#ip addr
or
#ifconfig
inet 192.168.248.132 netmask 255.255.255.0 broadcast 192.168.248.255
inet 192.168.248.133 netmask 255.255.255.0 broadcast 192.168.248.255
inet 192.168.248.134 netmask 255.255.255.0 broadcast 192.168.248.255

Step 03: Insert below information to all systems(system1, system2 and loadbalancer) /etc/hosts file
#vim /ete/hosts
192.168.248.132 system1.osradar.com system1
192.168.248.133 system2.osradar.com system2
192.168.248.134 loadbalancer.osradar.com loadbalancer

Step 04: To check that you can reach each system
#ping system1
#ping system2
#Pint loadbalancer

Step 05: Now install httpd to systems (system1, system2)
#yum install httpd -y
#systemctl start httpd
#systemctl enable httpd
#firewall-cmd –permanent –zone=public –add-service=http
#firewall-cmd –permanent –zone=public –add-service=https
#firewall-cmd –reload
#firewall-cmd –list-all (to ckeck status)

Step 06: To check your web service is ok visit 192.168.248.132 and 192.168.248.133 from your systems browser. You will find that Apahe test page appears.

You can make different index.html files for system1 and system2. So that you can get the difference. Here, we create index.html for system1 and system2 under /var/www/html

#vim /var/www/html/index.html (for system1)
This is <h1>system1</h1>.osradar.com
Website
<h3>IP: 192.168.248.132</h3>
#vim /var/www/html/index.html (for system2)
This is <h1>system2</h1>.osradar.com
Website
<h3>IP: 192.168.248.133</h3>

Step 07: Install HAProxy on loadbalancer system and configure
#yum install haproxy.x86_64 -y
#vim /etc/haproxy/haproxy.cfg
at the end of this file paste following information, save and exit.

##############Frontend Server Configuration##########
frontend webapp
bind *:80
default_backend webserver

#####################Backend Server Configuration##########

backend webserver
balance roundrobin
server system1 192.168.248.132:80 check
server system2 192.168.248.133:80 check

Step 08: Now we will check firewall status
#firewall-cmd –list-all
If we found that port 80 and 8080 is not added in firewall then we have to add

#firewall-cmd –permanent –zone=public –add-port=80/tcp
#firewall-cmd –permanent –zone=public –add-port=8080/tcp
#firewall-cmd –reload

Step 09: We will change SeLinux status from enforcing to permissive
#setenforce 0

Step 10:
#systemctl start haproxy.service
#systemctl enable haproxy.service

From loadbalancer system web browser visit 192.168.248.134. Hit(refresh) this IP two/three times and you will see web page from system1 and system2 are visible.

That’s how loadbalancer works.

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