Nagios 4 : Set Thresholds2026/03/27

	This is the Threshold settings section. It is set on some items by default but if you change it, configure like follows.
[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 reload nagios

[2]	If you want to configure the new threshold setting, the process would be as follows.

[root@dlp ~]#

vi /etc/nagios/objects/localhost.cfg

# add to last line
# for example, if the free space on the /run partition falls below 20%, 
# it will be marked as Warning, and if it falls below 10%, it will be marked as Critical
define service{
    use                     local-service
    host_name               localhost
    service_description     RUN Partition
    check_command           check_local_disk!20%!10%!/run
}

[root@dlp ~]#

systemctl reload nagios

[3]	If the threshold is exceeded, an alert will be generated.

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