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Load Balancing with HAProxy

Using HAProxy for a load-balanced web service.

HAProxy Server

Installation

Update OS

# dnf clean all && dnf update

Install haproxy

# dnf install haproxy

Configure service

Use haproxy.cfg.template as haproxy config file.

# cp haproxy.cfg.template /etc/haproxy/haproxy.cfg

Note: Replace the IP's of the webservers:

...
backend app
    balance     roundrobin
    server  web1 192.168.0.21:80 check
    server  web2 192.168.0.22:80 check

Enable service

# systemctl enable --now haproxy

Note: Fix selinux if needed

  • Enable booleans
# setsebool -P nis_enabled 1
# setsebool -P haproxy_connect_any 1
  • Enable port
# semanage port -a -t http_port_t -p tcp 150

Web Service Node

Installation

Update OS

# dnf clean all && dnf update

Install httpd

# dnf install httpd

Enable service

# systemctl enable --now httpd

Configure service

Use index.html.template as index file.

# cp index.html.template /var/www/html/index.html

Note: Replace the hostname of the webservers:

...
<h1>
Hello from [hostname]
</h1>
...

Test service

Use curl to test the load balancing of web servers

# curl localhost
<html>
<head><title>Apache is running!</title></head>
<body>
<h1>
Hello from webserver1
</h1>
</body>
</html>

# curl localhost
<html>
<head><title>Apache is running!</title></head>
<body>
<h1>
Hello from webserver2
</h1>
</body>
</html>

References