HAProxy is an open-source load balancer proxy used to run several web applications with high performance and increase the speed by dividing the load across multiple servers. In addition, if a server dies, HAProxy detects it and reroutes its web traffic to other servers, ensuring that clients suffer no interruptions. This guide demonstrates how to install HAProxy on Ubuntu 22.04 LTS.
I will demonstrate how to install HAProxy on Ubuntu 22.04 step by step. This tutorial assumes you have at least a fundamental understanding of Linux, are familiar with the shell, and, most importantly, host your website on a VPS. If you are not using the root account, you may need to append “sudo” to the instructions to obtain root access.
- A server runs Ubuntu 22.04, 20.04, or any other Debian-based distribution, such as Linux Mint.
- You should install the operating system from scratch to avoid any potential complications.
- SSH access to the server, or if you’re on a desktop, launch Terminal.
- A non-root user with sudo or root access. However, we advocate acting as a non-root sudo user, as carelessness when working as root can destroy your system.
Install HAProxy on Ubuntu 22.04 LTS
Step 1. First, perform the following apt commands in the terminal to ensure that your system packages are up-to-date.
sudo apt update sudo apt upgrade sudo apt install wget apt-transport-https gnupg2 software-properties-common
Step 2. Installing Apache HTTP Server on Ubuntu 22.04.
Execute the following command to install the most recent version of Apache on your Ubuntu system:
sudo apt install apache2
Enable Apache (so it starts automatically at system boot), run it, and validate its status using the procedures listed below.
sudo systemctl enable apache2 sudo systemctl start apache2 sudo systemctl status apache2
You can verify the Apache2 version with the command below:
Step 3. Setup Apache Web Servers as Backend Server.
Now we configure two Apache web servers as the tutorial’s backend server.
- Install the Apache package on the backend server and generate a sample Apache index page using the below command.
echo "<H1>Apache Server One</H1>" | tee /var/www/html/index.html
- Apache package should be installed on the second backend server. Create an example Apache index page with the below command.
echo "<H1>Apache Server Two</H1>" | tee /var/www/html/index.html
Step 4. Installing HAProxy on Ubuntu 22.04.
HAProxy is accessible by default on the Ubuntu 22.04 basic repository. Now use the command below to install the most recent stable version of HAProxy on your Ubuntu system:
sudo apt install haproxy
Enable HAProxy (so it starts automatically upon system boot), start it, and verify its status using the commands below.
sudo systemctl enable haproxy sudo systemctl start haproxy sudo systemctl status haproxy
Step 5. Configure HAProxy. Confirm the installation and verify the version of HAProxy that was installed:
Now, using your preferred text editor, modify the HAProxy default configuration file and define the backend web servers:
Add your two Apache backend servers:
frontend apache_front # Frontend listen port - 80 bind *:80 # Set the default backend default_backend apache_backend_servers # Enable send X-Forwarded-For header option forwardfor backend apache_backend_servers # Use roundrobin to balance traffic balance roundrobin # Define the backend servers server HA01 192.168.1.100:80 check server HA02 192.168.1.101:80 check
Save and close the file, then use the systemctl command to restart the HAProxy service:
sudo systemctl restart haproxy
Step 6. Configure Firewall.
Now we configure a Simple Firewall (UFW) with Apache to permit public access on the default web ports for HTTP and HTTPS:
sudo ufw allow OpenSSH sudo ufw allow 'Apache Full' sudo ufw enable
Step 7. Test HAProxy.
Once completely configured and installed, launch your web browser and enter http://your-haproxy-ip-address in the address bar. After each refresh, HAProxy delivers requests to backend servers individually.