How to Install Nagios on Linux Mint Latest

In this tutorial, we will guide you through the installation of Nagios on Linux Mint latest.

Step 1: Update Your System's Packages

Before starting the installation process, make sure that all the packages installed on your system are up-to-date. You can do this by running the following command:

sudo apt-get update
sudo apt-get upgrade

Step 2: Install Required Packages

Nagios requires the following packages to be installed on your system:

apache2
php-gd
libgd-dev
libapache2-mod-php
build-essential
openssl
libssl-dev
wget

To install all these packages, run the following command:

sudo apt-get install apache2 php-gd libgd-dev libapache2-mod-php build-essential openssl libssl-dev wget

Step 3: Download Nagios Core and Nagios Plugins

Visit https://www.nagios.org/downloads/ and download the latest version of Nagios Core and Nagios Plugins.

Once downloaded, navigate to the downloads directory and extract the downloaded files:

cd ~/Downloads
tar -xzf nagios-x.x.x.tar.gz
tar -xzf nagios-plugins-x.x.x.tar.gz

Step 4: Install Nagios Core

Navigate to the Nagios Core directory and run the following commands to install Nagios Core:

cd nagios-x.x.x
./configure --with-command-group=nagcmd
sudo make all
sudo make install
sudo make install-commandmode
sudo make install-init
sudo make install-config

Step 5: Configure Apache2 for Nagios

Create a new Nagios configuration file at /etc/apache2/sites-available/nagios.conf and put in the following content:

ScriptAlias /cgi-bin/nagios/cgi /usr/local/nagios/sbin
<Directory /usr/local/nagios/sbin>
   Options ExecCGI
   AllowOverride None
   Order allow,deny
   Allow from all
   AuthName "Restricted Area"
   AuthType Basic
   AuthUserFile /usr/local/nagios/etc/htpasswd.users
   Require valid-user
</Directory>

Alias /nagios /usr/local/nagios/share
<Directory /usr/local/nagios/share>
   Options None
   AllowOverride None
   Order allow,deny
   Allow from all
   AuthName "Restricted Area"
   AuthType Basic
   AuthUserFile /usr/local/nagios/etc/htpasswd.users
   Require valid-user
</Directory>

Then, enable the Nagios configuration and restart Apache:

sudo a2ensite nagios.conf
sudo service apache2 restart

Step 6: Install Nagios Plugins

Navigate to the Nagios Plugins directory and run the following commands to install Nagios Plugins:

cd nagios-plugins-x.x.x
./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-openssl
sudo make
sudo make install

Step 7: Create Nagios User

Create a new Nagios user and group using the following commands:

sudo useradd nagios
sudo groupadd nagcmd
sudo usermod -a -G nagcmd nagios

Step 8: Configure Nagios

Configure Nagios by editing the /usr/local/nagios/etc/nagios.cfg file:

• Add nagios@localhost to the admin_email field.
• Change check_external_commands to 1.
• Add nagcmd to the authorized_for_system_information, authorized_for_system_commands, and authorized_for_configuration_information fields.

Save and close the file.

Step 9: Create Nagios Web Admin User

Create a Nagios web admin user using the following commands:

sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Step 10: Restart Nagios

Finally, restart Nagios using the following command:

sudo service nagios restart

Step 11: Access Nagios Web Interface

You can now access the Nagios web interface by navigating to http://localhost/nagios on your web browser. Enter the username and password you created earlier to log in.

Congratulations! You have successfully installed Nagios on Linux Mint Latest.

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