NRPE 2.7.1 command_prefix problem

[Andy Shellam]

I've been looking at this some more today, and finally found the problem 
and solution!

I added "> /dev/stdout 2>&1" to the end of a command in my nrpe.cfg, and 
got the following result when running check_nrpe off my Nagios server:

"sudo: sorry, you must have a tty to run sudo."

Looking at the /etc/sudoers file on the machine reveals a line "Defaults 
requiretty".  Commenting this out sorted the problem.
For some reason, on a stock FC4 install, the sudoers file was virtually 
empty, yet in FC6 it was full of various settings!

Andy.

andy.shellam-lists at mailnetwork.co.uk wrote:
> I've been head-scratching most of the afternoon over this.
> I've installed NRPE 2.7.1 on a Fedora Core 6 machine, and no matter what I
> try, it doesn't like the command_prefix setting.
>
> Here is my config:
>
> ...
> ### Daemon Options
>
> pid_file=/var/run/nrpe.pid
> server_port=5666
> #server_address=192.168.1.1
> nrpe_user=nagios
> nrpe_group=localservice
> #allowed_hosts=127.0.0.1,82.165.38.62
> dont_blame_nrpe=0
> #command_prefix=/usr/bin/sudo
> debug=1
> command_timeout=60
> connection_timeout=300
> #allow_weak_random_seed=1
>
> ### Commands configuration
> ...
>
> with all the commands listed afterwards (check_dns, check_procs etc.)
>
> Notice how command_prefix is commented out.  This works:
>
> # ./check_nrpe -H 127.0.0.1 -c check_dns
> DNS OK: 0.062 seconds response time. portland-1.andyshellam.eu returns
> 89.200.137.203|time=0.062236s;;;0.000000
>
> If I uncomment command_prefix and kill/restart NRPE:
>
> # ./check_nrpe -H 127.0.0.1 -c check_dns
> NRPE: Unable to read output
>
> If I login as the Nagios user ("nagios") which is whom NRPE runs under, and
> try the command I believe NRPE is trying to run:
>
> $ /usr/bin/sudo /usr/local/nagios/libexec/check_dns -H
> portland-1.andyshellam.eu -a 89.200.137.203
> DNS OK: 0.005 seconds response time. portland-1.andyshellam.eu returns
> 89.200.137.203|time=0.004811s;;;0.000000
>
> Any ideas, anyone?
>
> I've tried with and without SSL - makes no difference, enabled debugging but
> don't get anything helpful in syslog.  I have some plugins that need root
> privelege so need this working.
>
> Thanks,
> Andy.
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