Nagios Installation

NAGIOS: It's a monitoring tool used widely in server administration. When we have large no. of system like in data centers then we need some technology to monitor our data base servers, application servers, routers, other machines etc. 

Nagios provides a complete solution for this. Nagios provides graphical reports and monitoring of our network & servers. In order to setup nagios successfully, we need to install nagios on one server and different machines, servers will be configred in it. To communicate with configured hosts (servers), we need to install NRPE agents on servers, which need to be monitored. 


Here are the steps to install nagios server:

• Get Nagios and user creation
  
  1. Install required Utilities
     yum install -y wget httpd php gcc glibc glibc-common gd gd-devel make net-snmp
  2. Get Nagios & plugin on the server
     wget ​http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.5.0.tar.gz
     wget ​http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.16.tar.gz
  3. Create User: nagios
     useradd nagios
     groupadd nagcmd
     usermod –a –G nagcmd nagios 

• Nagios Installation
  
  1. Unzip the files
     tar zxvf nagios-3.5.0.tar.gz
     tar zxvf nagios-plugins-1.4.16.tar.gz
  2. Change directory & configure
     cd nagios
     ./configure --with-command-group=nagcmd
  3. Compile the files
     make all
     make install
     make install-init
     make install-config
     make install-commandmode
     make install-webconf
     cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/
     chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers
     /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
     /etc/init.d/nagios start
     /etc/init.d/httpd start
  4. Create user for Nagios
     htpasswd –c /usr/local/nagios/etc/htpasswd.users nagiosadmin

• Nagios Plugin Installation

cd /tmp/nagios-plugins-1.4.16
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

• Nagios Service Setup

chkconfig --add nagios
chkconfig --level 35 nagios on
chkconfig --add httpd
chkconfig --level 35 httpd on 

• Run Nagios

vi /etc/httpd/conf.d/nagios.conf
Add DirectoryIndex? parameter in conf file:
DirectoryIndex? index.php
And type url in browser example: ​http://172.29.16.95/nagios

• Restart the services

service nagios restart
service httpd restart