Nagios 4 : Set Thresholds2021/06/03 |
This is the Threshold settings section.
It is set on some items by default but if you change it, configure like follows. |
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[1] | The thresholds are set in configuration file by default. For example, the item for monitoring disk usage of root partition is set like follows. |
[root@dlp ~]#
vi /etc/nagios/objects/localhost.cfg ..... ..... # Define a service to check the disk space of the root partition # on the local machine. Warning if < 20% free, critical if # < 10% free space on partition. # the thresholds are set as Warning if > 20% free, critical if 10% > 10% free # change these values if you'd like to change them define service { use local-service ; Name of service template to use host_name localhost service_description Root Partition check_command check_local_disk!20%!10%!/ } ..... .....[root@dlp ~]# systemctl restart nagios |
[2] | For the case you add a new plugin and configure it, set like follows. (example below is for [check_ntp_time] plugin) |
[root@dlp ~]#
dnf --enablerepo=epel -y install nagios-plugins-ntp # display options for a plugin to confirm usage [root@dlp ~]# /usr/lib64/nagios/plugins/check_ntp_time -h ..... ..... -w, --warning=THRESHOLD Offset to result in warning status (seconds) -c, --critical=THRESHOLD Offset to result in critical status (seconds) ..... ..... # add definition of command for a plugin with thresholds' options [root@dlp ~]# vi /etc/nagios/objects/commands.cfg # add to the end define command { command_name check_ntp_time command_line $USER1$/check_ntp_time -H $ARG1$ -w $ARG2$ -c $ARG3$ } # add definition of service with thresholds' values [root@dlp ~]# vi /etc/nagios/objects/localhost.cfg # add to the end # Warning with 1 sec time difference, Critical with 2 sec difference define service { use local-service host_name localhost service_description NTP_TIME check_command check_ntp_time!ntp.nict.jp!1!2 notifications_enabled 1 } systemctl restart nagios |
[3] | The notification is sent if a system value is over the threshold. |
From nagios@dlp.srv.world Wed Jun 2 23:02:06 2021 Return-Path: <nagios@dlp.srv.world> X-Original-To: root@localhost Delivered-To: root@localhost Date: Wed, 02 Jun 2021 23:02:06 -0500 To: root@localhost Subject: ** PROBLEM Service Alert: localhost/NTP_TIME is CRITICAL ** User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii From: nagios@dlp.srv.world Status: R ***** Nagios ***** Notification Type: PROBLEM Service: NTP_TIME Host: localhost Address: 127.0.0.1 State: CRITICAL Date/Time: Wed Jun 2 23:02:06 CDT 2021 Additional Info: NTP CRITICAL: Offset -8.077222943 secs, stratum best:0 worst:1 |
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