Nagios Quick-Start on Linux Xubuntu 16.04 Xenial LTS

Getting-Started with Nagios on Xubuntu 16.04 Xenial LTS

Hello Xubuntu User! The Tutorial shows you Step-by-Step How to Install and Getting-Started with Nagios 4 Monitoring System for Linux Xubuntu 16.04 Xenial Xerus LTS Desktop.

First, Nagios is a Powerful Monitoring System that enables Organizations to Identify and Resolve IT Infrastructure Problems before they affect Critical Business Processes.

Moreover, the Nagios Workflow Management Features are:

• Monitoring: IT staff configure Nagios to monitor critical IT infrastructure components
• Alerting: Nagios sends alerts when critical infrastructure components fail and recover
• Response: IT staff can acknowledge alerts and begin resolving outages and investigating security alerts immediately
• Reporting: Reports provide a historical record of outages, events, notifications, and alert response for later review
• Maintenance: Scheduled downtime prevents alerts during scheduled maintenance and upgrade windows
• Planning: Trending and capacity planning graphs and reports allow you to identify necessary infrastructure upgrades before failures occur.

1. Open a Terminal Shell emulator window
   Ctrl+Alt+t on desktop
   (Press “Enter” to Execute Commands)

   

   In case first see: Terminal QuickStart Guide.

2. Install the Required Packages.

   sudo su

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

   apt install php7.0-gd libgd2-xpm-dev build-essential /napache2 libapache2-mod-php7.0

3. Adding nagios User and Groups
   Add the nagios User:

   useradd nagios

   Make the nagios Group:

   groupadd nagios

   Add the nagios user to the group:

   /usr/sbin/usermod -G nagios nagios

   Create a new nagcmd group for allowing external commands to be submitted through the web interface:

   groupadd nagcmd

   Add both the nagios & apache users to the Group:

   usermod -a -G nagcmd nagios

   usermod -a -G nagcmd www-data

   Last Achieve the SuperUser Session:

   exit

4. Download Latest Nagios Core Linux Source

   Nagios Core tar.gz Archive

   Nagios Core

5. Double-Click and Extract Nagios Core into /tmp.

   

   Or from Command Line:

   tar zxvf ~/Downloads/nagios*.tar.gz -C /tmp/

6. Compiling and Installing Nagios Core on Linux Xubuntu.

   cd /tmp/nagios*

   ./configure --with-command-group=nagcmd

   make all

   sudo su

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

   make install

   make install-init

   make install-config

   make install-commandmode

7. Installing Nagios Core Web Interface.

   mkdir -p /etc/httpd/conf.d/nagios.conf

   make install-webconf

8. Post-Installation Configuration.

   cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/

   chown -R nagios:nagcmd /usr/local/nagios/libexec/eventhandlers

9. Checking Nagios Installation.

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

10. Enabling the Web Interface on Apache.

    /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-enabled/nagios.conf

    a2enmod cgi

    service apache2 restart

11. Starting Nagios.

    /etc/init.d/nagios start

12. Create a nagiosadmin Web User with Pass.

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

    Take Note of the Password!

    exit

13. Access the Nagios Web Interface.

    http://localhost/nagios

    User: ‘nagiosadmin’
    Pass: That you Setup Before

14. Download and Install Nagios Plugins

    Nagios Plugins Installation

    Nagios Plugins Setup