Instalar Nagios Network Monitoring System


Preparing Your System
First you need to install the following packages
sudo apt-get install apache2
sudo apt-get install build-essential
sudo apt-get install libgd2-xpm-dev
1) Create Account Information
Become the root user.
sudo -s
Create a new nagios user account and give it a password.
#/usr/sbin/useradd nagios
#passwd nagios
On Ubuntu server edition , you will need to also add a nagios group (it’s not created by default). You should be able to skip this step on desktop editions of Ubuntu.
#/usr/sbin/groupadd nagios
#/usr/sbin/usermod -G nagios nagios
Create a new nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user to the group.
#/usr/sbin/groupadd nagcmd
#/usr/sbin/usermod -G nagcmd nagios
#/usr/sbin/usermod -G nagcmd www-data
2) Download Nagios and the Plugins
Create a directory for storing the downloads.
#mkdir ~/downloads
#cd ~/downloads
Download the source code tarballs of both Nagios and the Nagios plugins (visit for links to the latest versions). At the time of writing, the latest versions of Nagios and the Nagios plugins were 2.10 and 1.4.10, respectively.
3) Compile and Install Nagios
Extract the Nagios source code tarball.
#cd ~/downloads
#tar xzf nagios-3.0.3.tar.gz
#cd nagios-3.0.3
Run the Nagios configure script, passing the name of the group you created earlier like so:
#./configure --with-command-group=nagcmd
Compile the Nagios source code.
#make all
Install binaries, init script, sample config files and set permissions on the external command directory.
#make install
#make install-init
#make install-config
#make install-commandmode
Don’t start Nagios yet - there’s still more that needs to be done…
4) Customize Configuration
Sample configuration files have now been installed in the /usr/local/nagios/etc directory. These sample files should work fine for getting started with Nagios. You’ll need to make just one change before you proceed…
Edit the /usr/local/nagios/etc/objects/contacts.cfg config file with your favorite editor and change the email address associated with the nagiosadmin contact definition to the address you’d like to use for receiving alerts.
#cp /usr/local/nagios/etc/objects/contacts.cfg /usr/local/nagios/etc/objects/contacts.cfg.old
#nano /usr/local/nagios/etc/objects/contacts.cfg
5) Configure the Web Interface
Install the Nagios web config file in the Apache conf.d directory.
#make install-webconf
Create a nagiosadmin account for logging into the Nagios web interface. Remember the password you assign to this account - you’ll need it later.
#htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Restart Apache to make the new settings take effect.
#/etc/init.d/apache2 reload
6) Compile and Install the Nagios Plugins
Extract the Nagios plugins source code tarball.
#cd ~/downloads
#tar xzf nagios-plugins-1.4.12.tar.gz
#cd nagios-plugins-1.4.12
Compile and install the plugins.
#./configure --with-nagios-user=nagios --with-nagios-group=nagios
#make install
7) Start Nagios
Configure Nagios to automatically start when the system boots.
#ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios
Verify the sample Nagios configuration files.
#/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
If there are no errors, start Nagios.
#/etc/init.d/nagios start
8) Login to the Web Interface
You should now be able to access the Nagios web interface at the URL below. You’ll be prompted for the username (nagiosadmin) and password you specified earlier.
Click on the “Service Detail” navbar link to see details of what’s being monitored on your local machine. It will take a few minutes for Nagios to check all the services associated with your machine, as the checks are spread out over time.
9) Other Modifications
If you want to receive email notifications for Nagios alerts, you need to install the mailx (Postfix) package.
#apt-get install mailx
You’ll have to edit the Nagios email notification commands found in /usr/local/nagios/etc/commands.cfg and change any ‘/bin/mail’ references to ‘/usr/bin/mail’. Once you do that you’ll need to restart Nagios to make the configuration changes live.
#/etc/init.d/nagios restart

Installing NagVis

cd ~/downloads
tar xzf nagvis-1.3.tar.gz
mv nagvis-1.3 nagvis
mv nagvis /usr/local/nagios/share
ls -l /usr/local/nagios/share/nagvis
cd /usr/local/nagios/share/nagvis

cp etc/nagvis.ini.php-sample etc/nagvis.ini.php
nano etc/nagvis.ini.php

grep -e '^User' /etc/apache2/httpd.conf ou grep -e 'USER' /etc/apache2/envvars
para checar o usuário a dar permissão nas pastas abaixo.

chown www-data /usr/local/nagios/share/nagvis -R
chmod 664 /usr/local/nagios/share/nagvis/etc/nagvis.ini.php
chmod 775 /usr/local/nagios/share/nagvis/nagvis/images/maps
chmod 664 /usr/local/nagios/share/nagvis/nagvis/images/maps/*
chmod 775 /usr/local/nagios/share/nagvis/etc/maps
chmod 664 /usr/local/nagios/share/nagvis/etc/maps/*
chmod 775 /usr/local/nagios/share/nagvis/var
chmod 664 /usr/local/nagios/share/nagvis/var/*


Watch the Maps
You should now be able to watch your defined maps in your browser:


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