NRPE: Unable to read output

[Dan Langille]

On 15 Jan 2007 at 18:08, Dan Langille wrote:

> Hi folks,
> 
> I'm using nrpe 1.9 on FreeBSD 6.x and I'm failing to get a remote 
> script to work.  It seems that no perl script works, but I can get 
> compiled plug-ins to work.
> 
> The result is, which invoked on the nagios server is:
> 
> $ ./check_nrpe -H app09 -c check_raid_dell
> NRPE: Unable to read output
> 
> On the remote machine, app09, I get:
> 
> $ perl check_raid_dell
> RAID_DELL CRITICAL: RAID is critical.
> $
> 
> I know that a value is being returned:
> 
> $ echo $?
> 2
> $
> 
> It's as if the remote script is inappropriate for use with nrpe.  I 
> can get other scripts to work:
> 
> 
> $ ./check_nrpe -H app09 -c check_users
> USERS OK - 1 users currently logged in |users=1;5;10;0
> 
> $ ./check_nrpe -H app09 -c check_load
> OK - load average: 0.00, 0.05, 0.06|load1=0.003;15.000;30.000;0; 
> load5=0.046;10.000;25.000;0; load15=0.061;5.000;20.000;0;
> 
> 
> FWIW, both of the above scripts are binaries:
> 
> $ file check_load check_users check_raid_dell
> check_load:      ELF 64-bit LSB executable, AMD x86-64, version 1 
> (FreeBSD), dynamically linked (uses shared libs), stripped
> check_users:     ELF 64-bit LSB executable, AMD x86-64, version 1 
> (FreeBSD), dynamically linked (uses shared libs), stripped
> check_raid_dell: perl script text
> 
> I have confirmed that the user that nrpe is running as can execute 
> the command:
> 
> # su -m -c nagios nagios -c "cd /usr/local/libexec/nagios && perl 
> check_raid_dell"
> RAID_DELL CRITICAL: RAID is critical.
> 
> Ideas?  Suggestions?  Plans?

My thanks to bernardl for the repeated questions about what I was 
doing.  The solution: write a wrapper which does a cd.

# cat check_raid_dell_wrapper
#!/bin/sh
cd /usr/local/libexec/nagios
perl check_raid_dell

Then refer to the wrapper in the nrpe.cfg on the remote server:

# grep dell /usr/local/etc/nrpe.cfg
command[check_raid_dell]=/usr/local/libexec/nagios/check_raid_dell_wra
pper

NOTE the use of the wrapper path

Restart nrpe on the remote box and then test it on the server:


$ ./check_nrpe -H app09 -c check_raid_dell
RAID_DELL CRITICAL: RAID is critical.

\o/

cheers


-- 
Dan Langille : Software Developer looking for work
my resume: http://www.freebsddiary.org/dan_langille.php
PGCon - The PostgreSQL Conference - http://www.pgcon.org/



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