Nagios Support Forum

Posted: **Thu Jul 03, 2014 3:17 pm**

I just upgraded to 2014R1.2

I created a new monitored host and services and some of the services (specifically yum, memory, and CPU) are coming back "Unknown: NRPE: Unable to read output".

I have tried the following:

checked the client nrpe.cfg file:

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# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port            = 5666
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
        only_from       = 172.16.17.95
}

Checked the scripts:

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-rwx------. 1 root   root     3060 Jun 23 14:24 custom_check_mem

Notice this check requires sudo, so I added to the sudoers file for nagios user:

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Defaults:nagios !requiretty
nagios ALL=NOPASSWD: /usr/local/nagios/libexec/custom_check_mem

Nothing has changed the output of the original error:

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Memory Usage;UNKNOWN;SOFT;3;NRPE: Unable to read output

Posted: **Mon Jul 07, 2014 12:39 pm**

Can you post the custom_check_mem file? I am guessing that calls check_nrpe, but if that is the case is there any reason you have a wrapper?

Posted: **Mon Jul 07, 2014 3:11 pm**

I'm sorry, I'm misunderstanding. Do you want me to post the file contents for the custom_check_mem file from the client server under /usr/local/nagios/libexec?

Posted: **Mon Jul 07, 2014 7:55 pm**

Yes, please attach the custom_check_mem file from the client server (you might need to give it a .txt extension).

Posted: **Tue Jul 08, 2014 7:43 am**

File Attached

Posted: **Tue Jul 08, 2014 3:56 pm**

Are any of your NRPE checks working or is it just this one failing?

Posted: **Tue Jul 08, 2014 4:00 pm**

Just a few of the services. See the attached screenshot.

Posted: **Tue Jul 08, 2014 5:33 pm**

I presume the monitored server is cent/rhel? Can you run the check from the cli?

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/usr/local/nagios/libexec/custom_check_mem

Posted: **Wed Jul 09, 2014 8:18 am**

The monitored server is a VM on VMWare running RHEL.

As nagios user running the custom_check_mem I get permission denied on the monitored server. This is after I have added the following to sudoers:

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nagios ALL=NOPASSWD: /usr/local/nagios/libexec/custom_check_mem

Posted: **Wed Jul 09, 2014 12:27 pm**

Hmm permission denied eh? How were nrpe and the nagios plugins package installed on this system? Did you just use the xi-linux-agent guide? What is the output of the following when ran on that system?:

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ll /usr/local/nagios/libexec/

ll /usr/local/nagios/

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check_nrpe Unable to read output

check_nrpe Unable to read output

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