Having Some NRPE issues with specific commands

[brandon.pal]

Hi I'm running NRPE on my servers to run all scripts.

I'm trying to run "check_open_files" but am I getting "NRPE: Unable to read output"

If I run the command on the server:

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/usr/lib64/nagios/plugins/check_open_files.pl -w 85 -c 95
OK: 928 open files (0% of max 1000000)|opened_files=928;850000;950000

My NRPE.cfg

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command[check_open_files]=/usr/lib64/nagios/plugins/check_open_files.pl $ARG1$

tail /var/log/messages

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 Host is asking for command 'check_open_files' to be run...
Apr 29 14:09:06 dc01-cache-01 nrpe[21074]: Running command: /usr/lib64/nagios/plugins/check_open_files.pl -w 85 -c 95
Apr 29 14:09:06 dc01-cache-01 nrpe[21074]: Command completed with return code 2 and output:
Apr 29 14:09:06 dc01-cache-01 nrpe[21074]: Return Code: 2, Output: NRPE: Unable to read output
Apr 29 14:09:06 dc01-cache-01 nrpe[21074]: Connection from 10.91.100.105 closed.

I really can't figure out why it's not working.

I'm noticing issues with a few other plugins but others are running fine. I've yet to look into the other plugins but have tried everything I can think of for this one.

Any thoughts or help would be greatly appreciated.

[slansing]

If you are only setting $ARG1$ then you will need to specify the command on Nagios similar to this:

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$USER1$/check_nrpe -H $HOSTADDRESS$ -c check_open_files $ARG1$

Then you will need to place the following in the service definition in the $ARG1$ field:

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-a '-w 85 -c 95'

What does running the command manually from the nagios server output?:

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/usr/local/nagios/libexec/check_nrpe -H addr.of.remote.host -c check_open_files -a '-w 85 -c 95'

[brandon.pal]

Running command from nagios server:

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/usr/local/nagios/libexec/check_nrpe -H 10.91.101.25 -c check_open_files -a '-w 85 -c 95'
NRPE: Unable to read output

Service Management:

Check Command: check_nrpe
Command View: $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$
$ARG1$ : check_open_files -a '-w 30 -c 50'

[brandon.pal]

Could the .pl extension be causing the issues?

[tmcdonald]

Make sure that the perl script has a line like this at the top:

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#!/usr/bin/perl

or wherever your perl is located, otherwise NRPE has no idea how to run it.

[brandon.pal]

It's there.

[abrist]

Can the check be run from the remote system as user nagios?

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su nagios
/usr/lib64/nagios/plugins/check_open_files.pl -w 85 -c 95
echo $?

What are the permissions on the file:

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ls -la /usr/lib64/nagios/plugins/check_open_files.pl

Is dont_blame_nrpe set to 1?

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grep blame /usr/local/nagios/etc/nrpe.cfg

Note: make sure all the commands above are run from the remote system

[brandon.pal]

Can the check be run from the remote system as user nagios?

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su - nagios
This account is currently not available.

What are the permissions on the file:

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-rwxr-xr-x 1 root root 3259 Apr 29 17:30 /usr/lib64/nagios/plugins/check_open_files.pl

Is dont_blame_nrpe set to 1?

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grep blame /etc/nagios/nrpe.cfg
dont_blame_nrpe=1
# command arguments *AND* the dont_blame_nrpe directive in this

As a note I am able to run other commands through NRPE it seems this is the only one giving me a hard time

[lmiltchev]

su - nagios
This account is currently not available.

Hm-m, can you run the follwoing command and show us the output?

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grep nagios /etc/passwd

[brandon.pal]

nagios399:399::/var/spool/nagios:/sbin/nologin