Complete Installation & Configuration Steps in AWS EC2 Instance:

Installation of Nagios on Linux:

→ To start nagios core installation you must have your ec2 instance up and run and have already configured SSH access to the instance.

• Step-1: Install pre-requisite softwares on your EC2 machine prior to Nagios installation like apache, php, gcc compiler and gd developement libraries

  • sudo su
  • yum install httpd php
  • yum install gcc glibc glibc-common
  • yum install gd gd-devel

• Step-2: Create account information you need to setup a nagios user run the following commands

  • adduser -m nagios
  • passwd nagion

  Now, it ask to enter new password give ‘12345’ as password

  • groupadd nagioscmd
  • usermod -a -G nagioscmd nagios
  • usermod -a -G nagioscmd apache

• Step-3: Download nagios core 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

  • wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz
  • wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz

• Step-4: compile and install nagios extract the nagios sourcecode tarball

  • tar zxvf nagios-4.0.8.tar.gz
  • cd nagios-4.0.8

  Run the configuration script with the name of the group which you have created in above step

  • ./configure --with-command-group=nagioscmd

  Compile the nagios source code

  • make all

  install binaries, init script, sample config files and set permissions on the external command directly (to compile init script)

  • make install
  • make install-init
  • make install-config
  • make install-commandmode

• Step-5: configure the web interface

  • make install-webconf

• Step-6: create a ‘nagiosadmin’ account for login into the nagios web interface set password as well

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

  Asking for password, set a new pwd

  • service httpd restart

• Step-7: compile and install the nagios plugins. Extract the nagios plugins.

  source code tarball

  • cd ~/downloads
  • tar zxvf nagios-plugins-2.0.3.tar.gz
  • cd nagios-plugins-2.0.3

  compile and install the plugins →

  • ./configure --with-nagios-user=nagios --with-nagios-group=nagios
  • make
  • make install

• Step-8: start nagion. add nagios to the list of system services and have it automatically start when the system boots.

  • chkconfig --add nagios
  • chkconfig nagios on

  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

  • service nagios start
  • service httpd restart

• Step-9: copy public ip of ec2 instance and paste in google chrome, in given way

  for e.g → 20.1.1.1/nagios/

  ask for username and password

• ec2-user
• sudo su
• yum install httpd php