check_nrpe: Invalid packet type received from server

[nelsonw]

$ ./check_nrpe -H x.x.x.x -n -c Test
CHECK_NRPE: Invalid packet type received from server.

I receive "Invalid packet type received from server" when using check_nrpe.

I believe there is a constraint within nrpe in that it cannot, by default, manage output more than 1K from NSClient++.

Reading the article, https://support.nagios.com/kb/article.php?id=518, it suggests I make the following changes

- Add the line "payload length=8192" to my nsclient.ini file and restart NSClient++
- Include a "-2" and "P 8192" in the check_nrpe command (for example, /usr/local/nagios/libexec/check_nrpe -H x.x.x.x -2 -P 8192)

However, the version of check_nrpe does not recognize the -2 and -P options

$ ./check_nrpe -H x.x.x.x -n -2 -P 8192
./check_nrpe: invalid option -- '2'
./check_nrpe: invalid option -- 'P'

NRPE Plugin for Nagios
Copyright (c) 1999-2008 Ethan Galstad ([email protected])
Version: 2.15
Last Modified: 09-06-2013
License: GPL v2 with exemptions (-l for more info)
SSL/TLS Available: Anonymous DH Mode, OpenSSL 0.9.6 or higher required

Usage: check_nrpe -H <host> [ -b <bindaddr> ] [-4] [-6] [-n] [-u] [-p <port>] [-t <timeout>] [-c <command>] [-a <arglist...>]

Options:
-n = Do no use SSL
-u = Make socket timeouts return an UNKNOWN state instead of CRITICAL
<host> = The address of the host running the NRPE daemon
<bindaddr> = bind to local address
-4 = user ipv4 only
-6 = user ipv6 only
[port] = The port on which the daemon is running (default=5666)
[timeout] = Number of seconds before connection times out (default=10)
[command] = The name of the command that the remote daemon should run
[arglist] = Optional arguments that should be passed to the command. Multiple
arguments should be separated by a space. If provided, this must be
the last option supplied on the command line.

Note:
This plugin requires that you have the NRPE daemon running on the remote host.
You must also have configured the daemon to associate a specific plugin command
with the [command] option you are specifying here. Upon receipt of the
[command] argument, the NRPE daemon will run the appropriate plugin command and
send the plugin output and return code back to *this* plugin. This allows you
to execute plugins on remote hosts and 'fake' the results to make Nagios think
the plugin is being run locally.

$
$ ./check_nrpe -H x.x.x.x -n
I (0.5.0.62 2016-09-14) seem to be doing fine...
$

Please help

[mcapra]

According to the KB article you linked, in order for check_nrpe v2 to process those larger packets:

Code: Select all

NSClient++ also has this fixed packet size (referred to as payload length) which can be increased in the config file. However it required the same source code edit for the check_nrpe plugin on the Nagios server.

Have you tried using check_nrpe v3 instead with the arguments mentioned?

[nelsonw]

Thanks, upgrading check_nrpe has worked

[cdienger]

Glad to hear! Are we okay to lock the thread or did you have further questions?