How to install nagios into debian 9 stretch 10.01.18

apt-get update 
apt-get -y install build-essential apache2 php openssl perl make php-gd libgd2-xpm-dev libapache2-mod-php libperl-dev libssl-dev daemon wget apache2-utils unzip

Create a user for allowing the external commands to be executed through the web interface.

user: nagios

group: nagcmd

Also, add “nagios” and apache user (www-data) to the part of “nagcmd” group.

useradd nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd www-data
cd /tmp
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.3.2.tar.gz
tar -zxvf nagios-4.3.4.tar.gz
cd /tmp/nagios-4.3.4/

Use below steps to compile Nagios from the source code.

./configure --with-nagios-group=nagios --with-command-group=nagcmd --with-httpd_conf=/etc/apache2/sites-enabled/
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf

Configure Nagios

The installer has now placed configuration files in the “/usr/local/nagios/etc” directory. You don’t need to modify Nagios configuration files for now to start Nagios monitoring tool.

All you need is to update email address in the “/usr/local/nagios/etc/objects/contacts.cfg” file for “nagiosadmin” before you start Nagios…

vi /usr/local/nagios/etc/objects/contacts.cfg

Change to the email address of your choice to receive the notification.

define contact{
        contact_name                    nagiosadmin             ; Short name of user
        use                             generic-contact         ; Inherit default values from generic-contact template (defined above)
        alias                           Nagios Admin            ; Full name of user

email                           nagios@itzgeek.com      ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
        }

Configure Nagios Web Interface

Create a user “nagiosadmin” account for logging into the Nagios web interface. Remember the password you assign to user “nagiosadmin” – you’ll need it later.

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

To enable CGI, run:

a2enmod cgi

Restart Apache web service to make the new settings take effect.

service apache2 restart

Download and Install Nagios Plugins

Now, it’s time to download and install Nagios plugins for monitoring the services.

cd /tmp
wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar -zxvf /tmp/nagios-plugins-2.2.1.tar.gz
cd /tmp/nagios-plugins-2.2.1/

Compile and install the plugins.

./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

Start Nagios Server

Verify the sample Nagios configuration files.

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Start Nagios monitoring tool using the following command.

/etc/init.d/nagios start

Enable Nagios to start automatically at the system startup.

systemctl enable nagios

https://www.itzgeek.com/how-tos/linux/debian/how-to-install-nagios-on-debian-9-stretch.html

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How to install nagios into debian 9 stretch 10.01.18

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