Nagios 4 : Add Target Host (Services)2021/06/03

	It's possible to monitor other Hosts 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 ~]#

dnf --enablerepo=epel -y install nrpe nagios-plugins-{ping,disk,users,procs,load,swap,ssh}

[root@node01 ~]#

vi /etc/nagios/nrpe.cfg

# line 106 : add access permission (specify Nagios server)

allowed_hosts=127.0.0.1,::1

,10.0.0.30

# line 122 : permit arguments of commands on here

dont_blame_nrpe=

# line 300 : 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 -r -w .15,.10,.05 -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 305 : add follows

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 enable --now 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 ~]#

dnf --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 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
}

# for ping
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 see the status for a new server on the admin site.

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