Ubuntu Server - Nagios Core

Assuming the server already pre-installed with the following :-

• Ubuntu Server 14.04.1 LTS x64.
• OpenSSH
• Hostname : SVR01
• Username : master

Follow these steps-by-steps :-

1. sudo apt-get update
2. sudo apt-get upgrade
3. sudo /etc/network/interfaces
• static
• address 192.168.4.248
• netmask 255.255.255.0
• gateway 192.168.4.1
• network 192.168.4.0
• broadcast 192.168.4.255
• dns-nameservers 202.188.0.133 202.188.1.5
4. sudo apt-get install \
• wget \
• build-essential \
• apache2 \
• apache2-utils \
• libapache2-mod-php5 \
• php5-gd \
• libgd2-xpm-dev \
• postfix
5. When prompted for email address and SMTP server, just use the desired email address (preferably an IT Admin email) and the SMTP server address.
6. sudo useradd --system --home /usr/local/nagios -M nagios
7. sudo groupadd --system nagcmd
8. sudo usermod -a -G nagcmd nagios
9. sudo usermod -a -G nagcmd www-data
10. cd /tmp
11. sudo wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz (a newer version maybe available during this post, please check Nagios website).
12. sudo wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz (a newer version of plugins maybe available during this post, please check Nagios website).
13. tar -xzvf nagios-4.0.8.tar.gz
14. tar -xzvf nagios-plugins-2.0.3.tar.gz
15. cd nagios-4.0.8
16. sudo ./configure \
• --with-nagios-group=nagios\
• --with-command-group nagcmd \
• --with-mail=/usr/sbin/sendmail \
• --with-httpd_conf=/etc/apache2/conf-available
17. sudo make all
18. sudo make install
19. sudo make install-init
20. sudo make install-config
21. sudo make install-commandmode
22. sudo make install-webconf
23. sudo cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/
24. sudo chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers
25. sudo /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (verify Nagios configuration is correct or not).
26. sudo ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios
27. cd ..
28. cd nagios-plugins-2.0.3
29. sudo ./configure \
• --with-nagios-user=nagios \
• --with-nagios-group=nagios \
• --enable-perl-modules \
• --enable-extra-opts
30. sudo make
31. sudo make install
32. sudo a2enmod cgi
33. sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin (when prompted for password, key-in your preferred password, this will be use during login to the Web GUI).
34. sudo nano /etc/apache2/sites-enabled/000-default.conf
• Type --> Include conf-available/nagios.conf
35. sudo nano /etc/apache2/conf-available/fqdn.conf
• Type --> SVR01 localhost
36. sudo a2enconf fqdn
37. sudo nano /usr/local/nagios/etc/objects/contacts.cfg
• nagiosadmin = master@domain.com
38. sudo service apache2 restart
39. sudo service nagios start

Now from another PC with Windows, open Internet Explorer :-
URL = http://192.168.4.248/nagios

When prompted for username and password :-
Username = master
Password = [the password you have specified earlier]