Nagios is an open-source network monitoring and alert system which can keep supervision on your entire IT infrastructure to ensure your systems, applications, and services are running smoothly. It can alert users when there is an issue or potential problems with their infrastructure.
In this tutorial, we will learn how to install Nagios on Ubuntu Server Latest.
To install Nagios on Ubuntu Server, ensure that the following requirements are installed on your machine:
Before we start installing Nagios, it is always a good practice to update the Ubuntu Server. Run the below command:
sudo apt-get update
sudo apt-get upgrade
For Nagios installation, some prerequisites packages are required. Use the below command to install those packages:
sudo apt-get install build-essential libgd2-xpm-dev openssl libssl-dev unzip apache2 php libapache2-mod-php php-gd libgd-dev libapache2-mod-php libperl-dev libssl-dev daemon wget apache2-utils
Download Nagios Core from its official website https://www.nagios.org/downloads/nagios-core/. Use the below command to download the latest version:
cd /tmp
curl -L -O https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.6.tar.gz
Extract the downloaded tarball using the below command:
tar xzf nagios-4.4.6.tar.gz
Now start the compilation of Nagios Core from the /tmp/nagios directory.
cd nagios-4.4.6/
./configure --with-httpd-conf=/etc/apache2/sites-enabled
sudo make all
The below command creates a nagios user and group as per the Nagios requirement:
sudo make install-groups-users
sudo usermod -a -G nagios www-data
To install Nagios on Ubuntu Server, execute the below command:
sudo make install
Now, start the installation of Nagios service files using below command:
sudo make install-daemoninit
sudo make install-config
sudo make install-commandmode
sudo make install-webconf
To create an Apache configuration for Nagios, execute the below command:
sudo a2enconf nagios
sudo a2enmod cgi
To configure the Nagios web interface, edit /usr/local/nagios/etc/cgi.cfg file and uncomment below lines:
# HTML CGI settings
main_config_file=/usr/local/nagios/etc/nagios.cfg
physical_html_path=/usr/local/nagios/share
url_html_path=/nagios
Also, edit /usr/local/nagios/etc/nagios.cfg file and uncomment the following lines
# Object Config files
cfg_file=/usr/local/nagios/etc/objects/commands.cfg
cfg_file=/usr/local/nagios/etc/objects/contacts.cfg
cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg
cfg_file=/usr/local/nagios/etc/objects/templates.cfg
cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
cfg_dir=/usr/local/nagios/etc/servers
To set up a Nagios admin password, use the below command:
sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
To restart Apache services, execute the below command:
sudo systemctl restart apache2
After the installation, verify Nagios installation by accessing the Nagios web interface URL. Use [Server-IP-Address]/nagios URL.
In this tutorial, we have learned how to install Nagios on Ubuntu Server Latest. Nagios serves as an important tool for network monitoring and alerts us when problems arise in our infrastructure.
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