CentOS 7
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Nagios 4 : Add Monitoring Target Host#2
2016/09/15
 
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.
# install from EPEL

[root@node01 ~]#
yum --enablerepo=epel -y install nrpe nagios-plugins-{ping,disk,users,procs,load,swap,ssh}
[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 210: comment out all

#
command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
#
command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
#
command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1
#
command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -sZ
#
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200
# line 223: uncomment all

command[check_users]=/usr/lib64/nagios/plugins/check_users -w $ARG1$ -c $ARG2$
command[check_load]=/usr/lib64/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
command[check_disk]=/usr/lib64/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
command[check_procs]=/usr/lib64/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$
[root@node01 ~]#
systemctl start nrpe

[root@node01 ~]#
systemctl enable nrpe

[2] If Firewalld is running, allow nrpe port.
[root@node01 ~]#
firewall-cmd --add-port=5666/tcp --permanent

success
[root@node01 ~]#
firewall-cmd --reload

success
[3] Configure Nagios server.
[root@dlp ~]#
yum --enablerepo=epel -y install nagios-plugins-nrpe
[root@dlp ~]#
vi /etc/nagios/nagios.cfg
# line 51: uncomment

cfg_dir=/etc/nagios/servers
[root@dlp ~]#
mkdir /etc/nagios/servers

[root@dlp ~]#
chgrp nagios /etc/nagios/servers

[root@dlp ~]#
chmod 750 /etc/nagios/servers

[root@dlp ~]#
vi /etc/nagios/objects/commands.cfg
# add follows to the end

define command{
    command_name        check_nrpe
    command_line        $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

[root@dlp ~]#
vi /etc/nagios/servers/node01.cfg
# create new

define host{
    use                    linux-server
    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!check_disk\!20%\!10%\!/
    }
# for current users

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

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

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

[root@dlp ~]#
systemctl restart nagios

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