Nagios/NRPE how to check all filesystems mounted below opt

I had a similar problem. check_procs is internally calling /bin/ps axwo 'stat uid pid ppid vsz rss pcpu comm args', it's listing the processes and then counting them. If you have configured nagios to run with a different user, it's using sudo to execute the command. And here is the problem. If you type sudo ps -AF | grep sudo, some distribution return "grep sudo", others return "sudo ps -AF" and "grep sudo". As check_procs is counting all processes, you will get different results on different machines. Unfortunately I do not have a solution yet how to force check_procs to not count sudo processes.

Since I see there is no problem with the line you added to /etc/sudoers file:

nagios  ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/

I suspect that there is a later entry in /etc/sudoers that override NOPASSWD option and that is reason for http-restart still asking for a password. With your above config, is nagios user a member of sudo group?

Just try to move this line to the end of /etc/sudoers file to exclude this possibility. Also make sure the nrpe user does not need a tty, by setting Defaults:nrpe !requiretty.

UPDATE Wed Jun 27 21:24:21 ICT 2012

To make the NRPE work, you also need to add sudo to your command definition in nrpe.cfg:

command[restart_http]=/usr/bin/sudo /usr/lib/nagios/plugins/http-restart