Nagios Support Forum

Posted: **Thu Jul 24, 2014 12:44 pm**

Found a really strange development. This is on my prod server, which I haven't changed anything on yet. All of the modifications in this thread have been in test. But I just happened to notice that I'm getting an "NRPE: Unable to read output" error on one of our service checks, but it shows up as unknown. So I ran 2 commands from the command line, one that is similar to the zone CPU check, and one that is using check_disk. Both come back with different exit codes.

Code: Select all

[root@nagiosXI1 tmp]# /usr/local/nagios/libexec/check_nrpe -p 5668 -H INCORRECTGLOBAL.snapon.com -c check_zone_cpu -a '-n ZONE -w 80 -c 90'
NRPE: Unable to read output
You have new mail in /var/spool/mail/root
[root@nagiosXI1 tmp]# echo $?
1
[root@nagiosXI1 tmp]# /usr/local/nagios/libexec/check_nrpe -p 5668 -H SERVER.snapon.com -c check_disk -a '-w 20% -c 10% -p /'
NRPE: Unable to read output
[root@nagiosXI1 tmp]# echo $?
3

Posted: **Thu Jul 24, 2014 2:24 pm**

Alright. Lets run these checks without nrpe on their local boxes. Check the exit code after running each check locally.

Posted: **Thu Jul 24, 2014 2:55 pm**

Running the check_zone_cpu plugin on the wrong global (the same wrong global I was using with nrpe) gives me this:

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<GLOBAL>$ ./check_zone_cpu.sh -n <ZONE> -w 80 - c 90
Unknown argument: -
./check_zone_cpu.sh: print_usage: execute permission denied
</>
<GLOBAL>$ echo $?
3
</>
<GLOBAL>$

Check_disk on that zone makes even less sense:

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<ZONE>$ ./check_disk -w 20% -c 10% -p /
ld.so.1: check_disk: fatal: libintl.so.8: open failed: No such file or directory
Killed
</>
<ZONE>$ echo $?
137

Posted: **Thu Jul 24, 2014 3:18 pm**

Ok, so it looks like the disk check plugin on that zone is an older version of the plugin and isn't configured properly, so that's why the error it's reporting doesn't make any sense.

Posted: **Thu Jul 24, 2014 4:21 pm**

Ahh, so does the state changes to the source work as expected?

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NRPE:Unable to read output

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