Nagios : Add Monitoring Target Item2015/02/23

	It's possible to add monitoring Target Items. There are many RPM packages for them or it's possible to create a plugin by yourself. And also there are many plugins provided by comunity below. ⇒ http://exchange.nagios.org/
[1]	Many plugins are provided with RPM packages like follows.

# use EPEL repository

[root@dlp ~]#

yum --enablerepo=epel search nagios-plugins-

nagios-plugins-all.x86_64 : Nagios Plugins - All plugins
nagios-plugins-apt.x86_64 : Nagios Plugin - check_apt
nagios-plugins-bdii.x86_64 : Nagios Plugin - check_bdii_entries
nagios-plugins-bonding.x86_64 : Nagios plugin to monitor Linux bonding interfaces
nagios-plugins-breeze.x86_64 : Nagios Plugin - check_breeze
...
...
nagios-plugins-ups.x86_64 : Nagios Plugin - check_ups
nagios-plugins-users.x86_64 : Nagios Plugin - check_users
nagios-plugins-wave.x86_64 : Nagios Plugin - check_wave

[2]	For example, add check_ntp plugin to monitor time difference between the system and NTP server.

[root@dlp ~]#

yum --enablerepo=epel -y install nagios-plugins-ntp

[root@dlp ~]#

vi /etc/nagios/objects/commands.cfg

# add follows to the end

define command{
        command_name    check_ntp_time
        command_line    $USER1$/check_ntp_time -H $ARG1$ -w $ARG2$ -c $ARG3$
        }

[root@dlp ~]#

vi /etc/nagios/objects/localhost.cfg

# add follows to the end ( Warning if it has 1 sec time difference, Critical if it has 2 sec )

define service{
        use                             local-service
        host_name                       localhost
        service_description             NTP_TIME
        check_command                   check_ntp_time!ntp1.jst.mfeed.ad.jp!1!2
        notifications_enabled           1
        }

[root@dlp ~]#

/etc/rc.d/init.d/nagios reload

Running configuration check...done.
Reloading nagios configuration...done

[3]	It's possible to view the status for a new plugin on the admin site.

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