Non obvious 127 plugin error

[Craig Stewart]

Good day folks,

I've spent the better part of a week using Google and combing forums for
an answer to this question without much luck.  First the specs:

Nagios version 3.2.3
Nagios and associated plugins installed on CentOS 5.6 and Fedora 15
servers via package management (i.e. yum)

I have a couple plugins that simply won't execute.  One of which is the
check_dig command.  I'll use this for an example.

>From the commands.cfg file for Nagios:

define command{
	command_name    check_dns
	command_line    /usr/lib/nagios/plugins/check_dig -H $HOSTADDRESS$ -l
$ARG1$ -a $ARG2$ -w $ARG3$ -c $ARG4$ -t $ARG5$
	}

>From the Nagios log file:

[1306863226] Warning: Return code of 127 for check of service
'DNS-Check' on host 'TS-TOR-DNS-1' was out of bounds. Make sure the
plugin you're trying to run actually exists.


Okay, first to see if it exists:

[root at nms ~]# locate check_dig
/usr/lib/nagios/plugins/check_dig
[root at nms ~]#

Ownership and permissions check:

[root at nms ~]# ls -l /usr/lib/nagios/plugins/check_dig
-rwxr-xr-x. 1 nagios nagios 43292 Mar 23 15:42
/usr/lib/nagios/plugins/check_dig
[root at nms ~]#

Try running it as root:
[root at nms ~]# /usr/lib/nagios/plugins/check_dig *BLANKED* -l *BLANKED*
-a *BLANKED* -c 5 -w 0.25
DNS OK - 0.005 seconds response time (*BLANKED*. 900 IN A
*BLANKED*)|time=0.004967s;0.250000;5.000000;0.000000

So it works as root.  Now to try as Nagios user:
[root at nms ~]# su - nagios
-bash-4.2$ /usr/lib/nagios/plugins/check_dig *BLANKED* -l *BLANKED* -a
*BLANKED* -c 5 -w 0.25
DNS OK - 0.005 seconds response time (*BLANKED*. 900 IN A
*BLANKED*)|time=0.004967s;0.250000;5.000000;0.000000

It works as the Nagios user as well.

So, I'm sure you can see my confusion.  The plugin exists and is
executable for a user on the system, but even when called directly as
opposed to using the $USER1$ macro, the Nagios process can't run it.

Any thoughts anyone?

Cheers!

Craig

-- 
Craig Stewart
Systems Integration Analyst
Craig.Stewart at corp.xplornet.com
Xplornet - Broadband, Everywhere

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