NAGIOS

Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

Capabilities to monitor applications, services, operating systems, network protocols, system metrics and infrastructure components with a single tool

Centralized view of entire monitored IT infrastructure

Detailed status information available through web interface

Alert acknowledgments provide communication on known issues and problem response

Event handlers allow automatic restart of failed applications and services

#yum install httpd php

#yum install gcc glibc glibc-common

#yum install gd gd-devel

#/usr/sbin/useradd -m nagios

#passwd nagios

#/usr/sbin/groupadd nagcmd

#/usr/sbin/usermod -a -G nagcmd nagios

#/usr/sbin/usermod -a -G nagcmd apache

Configure mail server

Download Nagios and plugins

: - http://www.nagios.org/download/

Create a directory for storing the downloads.

mkdir ~/downloads

cd ~/downloads

Extract the Nagios source code tarball.

cd ~/downloads

#tar xzf nagios­3.2.2.tar.gz

#cd nagios­3.2.2

./configure ­­with­command­group=nagcmd

       make all

        make install

        make install­init

        make install­config

        make install­commandmode

Don't start Nagios yet ­ there's still more that needs to be done...

     #vim /usr/local/nagios/etc/objects/contacts.cfg

     make install­webconf

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

     #service httpd restart

     #cd ~/downloads

     #tar xzf nagios­plugins­.tar.gz

      #cd nagios­plugins

./configure ­­with­nagios­user=nagios –with­nagios­group=nagios

     make

     make install

     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

#vim /etc/selinux/config

                                      Login to the Web Interface

You should now be able to access the Nagios web interface at the URL below. You'll be prompted for the username (nagiosadmin) and password you specified earlier.

http://localhost/nagios/

h

Permission Error Then#chown nagios.nagiocmd /usr/local/nagios/var/rw

#chmod g+rwx /usr/local/nagios/var/rw

#chmod g+s /usr/local/nagios/var/rw

Configuration Of Nagios

Below line number

# vim /usr/local/nagios/etc/objects/contacts.cfg

30 define contact{

31 contact_name nagiosadmin ; Short name of user

32 use generic-contact ; Inherit default values from generic- contact template (d efined above)

33 alias Nagios Admin ; Full name of user

35 email support@pawan.com ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS **

36 }

#vim /usr/local/nagios/etc/objects/localhost.cfg

change Below line number

29 host_name pawan.com

30 alias pawan

31 address 192.168.0.55

32 }

49 members pawan.com

You can define monitor services in :-----

#vim /usr/local/nagios/etc/objects/localhost.cfg

For example:- in last line

# Define a service to check FTP on the local machine.

# Disable notifications for this service by default, as not all users may have FTP enabled.

define service{

use local-service ; Inherit default values from a template

host_name pawan.com

service_description ftp

check_command check_ftp

}