nagios_check_open_files

This is a Nagios-check which verify if there are to many opened for a given user. For me this was necessary to check an application server [http://wildfly.org/]. Its also useful for monitoring the server and fine tune it.

Installation

Add the following to the sudoers file to grand permissions to lsof and to read the file limits from /proc/PID/limits. This can also be done for the nagios user.

Cmnd_Alias NRPE_CHECK_OPEN_FILES = /bin/cat /proc/*/limits, /sbin/lsof -u *

nrpe    ALL=(ALL) NOPASSWD: NRPE_CHECK_OPEN_FILES

Usage

./check_open_files.sh <username>

Example:

./check_open_files.sh apache