Ubuntu 14.04
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Nagios : Add Monitoring Target Host#2
2016/01/17
 
It's possible to monitor other servers on the network not only with simply Ping command but services on them.
[1] Install nrpe on a target host you'd like to monitor services on it.
root@node01:~#
apt-get -y install nagios-nrpe-server
root@node01:~#
vi /etc/nagios/nrpe.cfg
# line 81: add access permission (specify Nagios server)

allowed_hosts=127.0.0.1
,10.0.0.30
# line 97: permit arguments of commands

dont_blame_nrpe=
1
# line 219: comment out all

#
command[check_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
#
command[check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
#
command[check_hda1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1
#
command[check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -sZ
#
command[check_total_procs]=/usr/lib/nagios/plugins/check_procs -w 150 -c 200
# line 232: uncomment all

command[check_users]=/usr/lib/nagios/plugins/check_users -w $ARG1$ -c $ARG2$
command[check_load]=/usr/lib/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
command[check_disk]=/usr/lib/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
command[check_procs]=/usr/lib/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$
root@node01:~#
/etc/init.d/nagios-nrpe-server restart

[2] Configure Nagios server.
root@dlp:~#
apt-get -y install nagios-nrpe-plugin
root@dlp:~#
vi /etc/nagios3/conf.d/node01.cfg
# create new

define host{
    use                    generic-host
    host_name              node01
    alias                  node01
    address                10.0.0.51
    }
define service{
    use                    generic-service
    host_name              node01
    service_description    PING
    check_command          check_ping!100.0,20%!500.0,60%
    }
# for free disk

define service{
    use                    generic-service
    host_name              node01
    service_description    Root Partition
    check_command          check_nrpe_1arg!check_disk\!20%\!10%\!/
    }
# for current users

define service{
    use                    generic-service
    host_name              node01
    service_description    Current Users
    check_command          check_nrpe_1arg!check_users\!20\!50
    }
# for total processes

define service{
    use                    generic-service
    host_name              node01
    service_description    Total Processes
    check_command          check_nrpe_1arg!check_procs\!250\!400\!RSZDT
    }
# for current load

define service{
    use                    generic-service
    host_name              node01
    service_description    Current Load
    check_command          check_nrpe_1arg!check_load\!5.0,4.0,3.0\!10.0,6.0,4.0
    }

root@dlp:~#
/etc/init.d/nagios3 restart

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