NRPE: Unable to read output

[Thomas Guyot-Sionnest]

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On 16/05/08 05:05 AM, Marcus wrote:
> Hi Folks,
> 
> i'm trying to get a plugin for openvpn 
> (http://www.nagiosexchange.org/cgi-bin/pages/Detailed/1315.html) to work 
> with nrpe, but it gives me the dreaded "NRPE: Unable to read output"-error.
> 
> The server is a sles10sp1-xen-host running openvpn with the 
> management-console which is reachable via telnet on localhost:1195.
> 
> When i run the check manually, it works, although there is no "Linefeed" 
>   at the end.(Wonder if that might be the problem?)
> 
> The invocation-command basically looks like this:
> nagios at u-23:/usr/local/nagios/libexec> 
> /usr/local/nagios/libexec/check_openvpn -H 127.0.0.1 -p 1195 -P mypwd -n
> 
> Then the output is (on one line):
> OpenVPN OK: 0 connected 
> clients.nagios at u-239-s087:/usr/local/nagios/libexec>
> 
> Perl::Telnet is used to connect to tcp/1195, gives the pwd and checks 
> how many clients are connected.
> 
> My nrpe.cfg looks like this:
> 
> command[check_vpn]=/usr/local/nagios/libexec/check_openvpn -H 127.0.0.1 
> -p 1195 -P mypwd -n
> 
> When i issue
> 
> nagios at u-23:/usr/local/nagios/libexec> 
> /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_hd
> DISK OK - free space: / 9334 MB (86% inode=96%);| 
> /=1424MB;9067;10200;0;11334
> 
> it works great, however
> 
> nagios at u-23:/usr/local/nagios/libexec> 
> /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_vpn
> 
> results in
> 
> NRPE: Unable to read output
> 
> Can anybody please give me a hint whats going wrong here. :-/

If you're trying to run the plugin locally as root then try as the
nagios user instead (or whichever user nrpe runs as). I.e.:

> su nagios -c 'usr/local/nagios/libexec/check_openvpn -H 127.0.0.1 -p
1195 -P mypwd -n'

I doubt it would be caused by the missing newline, but if you think so
you can certainly add one in the plugin since it's written in perl...

Which version of Nrpe are you using?

Thomas
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