In this tutorial, we’ll walk you through each step of installing Nagios on Ubuntu 22.04. You will have a Nagios setup that is fully operational by the end of this article, which will make it easier for you to keep a close eye on your network and systems. Nagios, an open-source monitoring tool, plays a vital role in ensuring the stability and performance of your IT infrastructure. So, let’s get started!
Requirements
Make sure you have the following prerequisites in place before we start the installation process:
- Ubuntu 22.04 Virtono Server: Ensure that you have a fresh installation of Ubuntu 22.04 on a dedicated server or virtual machine.
- Root or Sudo Access: To execute administrative tasks, you’ll need either root access or a user account with sudo privileges.
- Stable Internet Connection: A stable internet connection is essential, as we’ll be downloading packages and updates from the internet.
Update and Upgrade
The first step is to ensure that your system is up to date. Open a terminal and run the following commands:
sudo apt update && apt upgrade -yThis will upgrade your system to the most recent packages and security patches and update the package list.
Install Prerequisites
Nagios has specific software prerequisites that must be installed on your Ubuntu 22.04 server. We’ll go through each of them and install them one by one.
sudo apt install autoconf gcc libc6 make wget unzip apache2 apache2-utils php libgd-dev libmcrypt-dev libssl-dev bc gawk dc build-essential snmp libnet-snmp-perl gettextThis script sets up the necessary software for Nagios to run properly, including Apache, PHP, and a number of libraries.
Create a Nagios User and Group
Nagios should run as a separate user and group. Create them with the following commands:
sudo useradd -m -s /bin/bash nagios
sudo groupadd nagcmd
sudo usermod -a -G nagcmd nagios
sudo usermod -a -G nagcmd www-dataDownload and Compile Nagios on Ubuntu
Let’s download and build Nagios Core right away. To store the Nagios source code, we will create a directory, go there, and then download the source archive:
cd /tmp
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.6.tar.gzExtract and Compile Nagios Core
Extract the downloaded archive and navigate to the Nagios on Ubuntu source directory:
tar -zxvf nagios-4.4.6.tar.gz
cd nagios-4.4.6Next, configure Nagios on Ubuntu and compile it:
./configure --with-nagios-group=nagios --with-command-group=nagcmd
make allInstall Nagios Core Binaries and Web Interface Files
Install Nagios on Ubuntu binaries, init script, and web interface files:
sudo make install
sudo make install-commandmode
sudo make install-init
sudo make install-config
sudo /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.confInstall Nagios on Ubuntu Plugins
Ubuntu’s package manager, apt, provides pre-compiled Nagios Plugins that you can easily install. This is the recommended method as it simplifies the installation process and ensures that you get the latest stable versions of the plugins. Run the following commands to install Nagios Plugins using apt:
sudo apt update
sudo apt install nagios-plugins
cp /usr/lib/nagios/plugins/* /usr/local/nagios/libexec/
It’s important to rebuild the Nagios configuration and restart Nagios after installing or updating plugins:
sudo /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
sudo systemctl restart nagios
sudo systemctl restart apache2Configure Apache Web Server
Create a symbolic link for the Nagios Apache configuration file and enable the site:
sudo ln -s /etc/apache2/sites-available/nagios.conf /etc/apache2/sites-enabled/Enable CGI and rewrite modules for Apache:
sudo a2enmod cgi rewriteSet Nagios Admin Password
Set a password for the Nagios admin user:
sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadminStart Nagios and Apache Services
Start the Nagios and Apache services and enable them to start on boot:
sudo systemctl enable nagios
sudo systemctl enable apache2
sudo systemctl restart nagios
sudo systemctl restart apache2Access Nagios Web Interface
Open your web browser and navigate to http://your_server_ip/nagios. Log in with the username nagiosadmin and the password you set earlier.
Congratulations! You have successfully installed Nagios on Ubuntu 22.04. Now you can start configuring Nagios to monitor your network, hosts, and services.
Final Thoughts
This guide has provided step-by-step instructions for installing Nagios on Ubuntu 22.04. Nagios is a powerful monitoring tool that will help you keep your network infrastructure, servers, and services in check. By following these instructions, you’ve taken the first step toward proactive system monitoring and maintenance.
Stay tuned for articles in the future where we will go into more detail about setting up monitoring plugins, configuring Nagios, and developing custom checks to meet your unique requirements.
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