Symptoms

Displaying a negative value for the percentage of memory usage on Linux hosts.

Negative Memory

Symptom present on EON 5.2 +.

Cause

The most likely cause is the presence of the package net-snmp in version higher than 5.7.2-43.

To be sure, run the following command :

yum info net-snmp

Finally, look at the Version and Revision fields.

Resolution

This problem is resolved with the update 1.2 of the package nagios-plugins-eon. This update includes the fix for the plug-in check_snmp_mem.pl.

Please update the package by running the following command :

yum update nagios-plugins-eon

Result :

Memory OK