How-to Install Nagios on Ubuntu 18.04 Bionic Easy Guide

April 17th, 2018 by thelinuxevangelist

Install Nagios Ubuntu 18.04 Bionic

You are Welcome! This Tutorial Shows You Step-by-Step How-to Install Nagios on Ubuntu 18.04 Bionic LTS 32/64-bit GNU/Linux Desktops.

First of all Latest Nagios for Ubuntu 18.04 is a powerful Monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

Furthermore 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.

Finally, the guide includes also detailed instructions on How to Install Nagios Plugins on Ubuntu 18.04.

How-to Install Nagios on Ubuntu 18.04 - Featured
  1. First Open a Shell Terminal emulator window
    (Press “Enter” to Execute Commands)

    How-to Install Nagios Ubuntu 18.04 - Open Terminal
  2. Then Install the Required Packages
    Logins as SuperUser to make shorter the others commmands:

    sudo su

    If Got “User is Not in Sudoers file” then Look: Solution

    So to Install the Packages:

    apt install php7.0-gd libgd2-xpm-dev build-essential \
    apache2 libapache2-mod-php7.0
  3. After to Add nagios User and Groups
    Create 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:

  4. Download Latest Nagios Core Linux Source:

    Nagios Core tar.gz Archive
  5. Then Double-Click and Extract Nagios Core into /tmp

    How-to Install Nagios Ubuntu 18.04 - Extracting Nagios

    Or from Command Line:

    tar zxvf ~/Downloads/nagios*.tar.gz -C /tmp/
  6. Furthermore to Compile and Install Nagios Core for Ubuntu

    cd /tmp/nagios*
    ./configure --with-command-group=nagcmd
    make all
    sudo su

    If Got “User is Not in Sudoers file” then Look: Solution

    make install
    make install-init
    make install-config
    make install-commandmode
  7. Follow Installing Nagios Core Web Interface
    First Make the needed directory:

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

    And the Install it:

    make install-webconf
  8. After make the Post-Installation Configuration

    cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/
    chown -R nagios:nagcmd /usr/local/nagios/libexec/eventhandlers
  9. Again to Check Nagios Installation

    /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
  10. And to Enable 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. Finally to Start up Nagios

    /etc/init.d/nagios start
  12. Again to Create a nagiosadmin Web User with Pass

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

    Take Note of the Password!

  13. And to Access the Nagios Web Interface


    User: ‘nagiosadmin’
    Pass: That You Setup Before

  14. Download and Install Nagios Plugins:

    Nagios Plugins Installation

How-to Install Nagios Ubuntu 18.04 - Nagios Web Interface

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