We are going to perform a Nagios installation starting from a Debian Etch installed without anything. With Nagios we will be able to monitor any equipment that has a snmp service installed and configured, although they can be monitored by other means that we will explain later.

The first thing we need to do is install Apache.

apt-get install apache2

We install the necessary build package

apt-get install build-essential

Now the necessary libraries for jpeg, png, and gd2

apt-get install libjpeg62 libjpeg62-dev libpng12-0 libpng12-dev libgd2-xpm-dev

we enter tmp

cd /tmp

and we download the gd2 library to install it

wget -c http://www.libgd.org/releases/gd-2.0.35.tar.gz
tar -xzvf gd-2.0.35.tar.gz
cd gd-2.0.35
./Set
Make
make install

We create the necessary users for nagios

useradd nagios
passwd nagios

The groups

groupadd nagios
groupadd nagcmd

and we add the users to their groups

usermod -G nagios nagios
usermod -G nagios elzalete
usermod -G nagcmd nagios
usermod -G nagcmd www-data

we go back to tmp

cd /tmp

and download Nagios and its plugins

WGET HTTP://tinyurl.com/2jyzao/nagios-3.0a5.tar.gz
WGET HTTP://tinyurl.com/2mqzzk/nagios-plugins-1.4.9.tar.gz

We extract Nagios

tar -xzf nagios-3.0a5.tar.gz

we enter the folder, we compile it and install it with all its modules

cd nagios-3.0a5
./Set –with-command-group=nagcmd
Make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf

we return to tmp and now decompress the Nagios plugins

cd /tmp
tar -xzf nagios-plugins-1.4.9.tar.gz

We compile and install them just like Nagios

cd nagios-plugins-1.4.9
./configure -with-nagios-user=nagios –with-nagios-group=nagios
Make
make install

We install the following module for perl

perl -MCPAN -e “install Net::SNMP”

and postfix for sending notification emails

apt-get install postfix

We create access to our Nagios page

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

We restart apache

/etc/init.d/apache2 reload

We start Nagios

/etc/init.d/nagios start

We create a link so that Nagios starts automatically each time our server boots up

ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios

We access the web of our nagios server

To visualize the 3D we need a vrml browser and Java on the client
apt-get install vrweb