Need help with NRPE in nagiosXI:

[shan_1986]

Hello All,

Im getting this error "NRPE unable to read output" in nagios CCM for a service check.
Plugin works fine inside the server (Ubuntu server), but when i place the service check in CCM, im getting this error.
Other service checks work fine for the server, only issue with this service check.

Could anyone help to resolve this?

Regards,
Sudarshan.

[tmcdonald]

Take a read through here, particularly section 7:

http://assets.nagios.com/downloads/nagi ... utions.pdf

[shan_1986]

Hello,

Have tried all the steps given in the document, but it didn't work.
But the other service checks are working fine which has the same permission.
The same service checks works well in Centos server. Is this a permission issue?
Please advise.

Regards,
Sudarshan.

[abrist]

Well, we need more information to help you further.
Can you post the command you trying to run as well well as the command + the full output when running it from the cli on the ubuntu server?
Also, posting the relevant command from the ubuntu server's nrpe.cfg will help as well.

[shan_1986]

Hello,

This is the output i get when i run from the CCM (GUI):

COMMAND: /usr/local/nagios/libexec/check_nrpe -H ****** -t 60 -c check_mountpoints
OUTPUT: NRPE: Unable to read output

Output when i run from the server:

/usr/lib/nagios/plugins/check_mountpoints -A

OK: All mounts were found

command in nrpe.cfg:
command[check_mountpoints]=/usr/lib/nagios/plugins/check_mountpoints -A

All the other service checks and plugins are having the same permission 755

Please let me know if you need more information.

Regards,
Sudarshan.

[scottwilkerson]

You mentioned

Output when i run from the server:

Code: Select all

/usr/lib/nagios/plugins/check_mountpoints -A

OK: All mounts were found

Is that a blank line before the OK? Plugins must return something on the first like of output, and this could be causing issues.

[tgriep]

Could you post the full nrpe.cfg file that is on the Ubuntu server?

[shan_1986]

Hello,

Yes that is the output we are receiving when we run from the server:

/usr/lib/nagios/plugins/check_mountpoints -A
OK: all mounts were found (/mnt/CCR_Common )

Here is the nrpe.cfg file for reference:

Code: Select all

#############################################################################
# Sample NRPE Config File
# Written by: Ethan Galstad ([email protected])
#
# Last Modified: 11-23-2007
#
# NOTES:
# This is a sample configuration file for the NRPE daemon.  It needs to be
# located on the remote host that is running the NRPE daemon, not the host
# from which the check_nrpe client is being executed.
#############################################################################


# LOG FACILITY
# The syslog facility that should be used for logging purposes.

log_facility=daemon



# PID FILE
# The name of the file in which the NRPE daemon should write it's process ID
# number.  The file is only written if the NRPE daemon is started by the root
# user and is running in standalone mode.

pid_file=/var/run/nagios/nrpe.pid



# PORT NUMBER
# Port number we should wait for connections on.
# NOTE: This must be a non-priviledged port (i.e. > 1024).
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

server_port=5666



# SERVER ADDRESS
# Address that nrpe should bind to in case there are more than one interface
# and you do not want nrpe to bind on all interfaces.
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

#server_address=127.0.0.1



# NRPE USER
# This determines the effective user that the NRPE daemon should run as.
# You can either supply a username or a UID.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_user=nagios



# NRPE GROUP
# This determines the effective group that the NRPE daemon should run as.
# You can either supply a group name or a GID.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_group=nagios



# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames
# that are allowed to talk to the NRPE daemon.
#
# Note: The daemon only does rudimentary checking of the client's IP
# address.  I would highly recommend adding entries in your /etc/hosts.allow
# file to allow only the specified host to connect to the port
# you are running this daemon on.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

allowed_hosts=*********



# COMMAND ARGUMENT PROCESSING
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments to commands that are executed.  This option only works
# if the daemon was configured with the --enable-command-args configure script
# option.
#
# *** ENABLING THIS OPTION IS A SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=1



# COMMAND PREFIX
# This option allows you to prefix all commands with a user-defined string.
# A space is automatically added between the specified prefix string and the
# command line from the command definition.
#
# *** THIS EXAMPLE MAY POSE A POTENTIAL SECURITY RISK, SO USE WITH CAUTION! ***
# Usage scenario:
# Execute restricted commmands using sudo.  For this to work, you need to add
# the nagios user to your /etc/sudoers.  An example entry for alllowing
# execution of the plugins from might be:
#
# nagios          ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/
#
# This lets the nagios user run all commands in that directory (and only them)
# without asking for a password.  If you do this, make sure you don't give
# random users write access to that directory or its contents!

# command_prefix=/usr/bin/sudo



# DEBUGGING OPTION
# This option determines whether or not debugging messages are logged to the
# syslog facility.
# Values: 0=debugging off, 1=debugging on

debug=0



# COMMAND TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# allow plugins to finish executing before killing them off.

command_timeout=60



# CONNECTION TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# wait for a connection to be established before exiting. This is sometimes
# seen where a network problem stops the SSL being established even though
# all network sessions are connected. This causes the nrpe daemons to
# accumulate, eating system resources. Do not set this too low.

connection_timeout=300



# WEEK RANDOM SEED OPTION
# This directive allows you to use SSL even if your system does not have
# a /dev/random or /dev/urandom (on purpose or because the necessary patches
# were not applied). The random number generator will be seeded from a file
# which is either a file pointed to by the environment valiable $RANDFILE
# or $HOME/.rnd. If neither exists, the pseudo random number generator will
# be initialized and a warning will be issued.
# Values: 0=only seed from /dev/[u]random, 1=also seed from weak randomness

#allow_weak_random_seed=1



# INCLUDE CONFIG FILE
# This directive allows you to include definitions from an external config file.

#include=/etc/nagios/check_disk.cfg
#include=/etc/nagios/sys_mon.cfg


# INCLUDE CONFIG DIRECTORY
# This directive allows you to include definitions from config files (with a
# .cfg extension) in one or more directories (with recursion).

#include_dir=<somedirectory>
#include_dir=<someotherdirectory>



# COMMAND DEFINITIONS
# Command definitions that this daemon will run.  Definitions
# are in the following format:
#
# command[<command_name>]=<command_line>
#
# When the daemon receives a request to return the results of <command_name>
# it will execute the command specified by the <command_line> argument.
#
# Unlike Nagios, the command line cannot contain macros - it must be
# typed exactly as it should be executed.
#
# Note: Any plugins that are used in the command lines must reside
# on the machine that this daemon is running on!  The examples below
# assume that you have plugins installed in a /usr/local/nagios/libexec
# directory.  Also note that you will have to modify the definitions below
# to match the argument format the plugins expect.  Remember, these are
# examples only!


# The following examples use hardcoded command arguments...



command[check_mountpoints]=/usr/lib/nagios/plugins/check_mountpoints -A
command[check_cpu]=/usr/lib/nagios/plugins/check_cpu_custom.sh $ARG1$ $ARG2$
command[check_mem]=/usr/lib/nagios/plugins/check_mem_avail -w 20 -c 10
command[check_swap]=/usr/lib/nagios/plugins/check_swap -w 20% -c 10%
command[check_load]=/usr/lib/nagios/plugins/check_load -w 45,40,35 -c 60,55,50
command[check_users]=/usr/lib/nagios/plugins/check_users -w 50 -c 75
command[check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib/nagios/plugins/check_procs
command[check_uptime]=/usr/lib/nagios/plugins/check_uptime
command[check_disk1]=/usr/lib/nagios/plugins/check_disk -w 10% -c 5% -p / -u MB

# The following examples allow user-supplied arguments and can
# only be used if the NRPE daemon was compiled with support for
# command arguments *AND* the dont_blame_nrpe directive in this
# config file is set to '1'.  This poses a potential security risk, so
# make sure you read the SECURITY file before doing this.

#command[check_users]=/usr/lib/nagios/plugins/check_users -w $ARG1$ -c $ARG2$
#command[check_load]=/usr/lib/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
#command[check_disk]=/usr/lib/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
#command[check_procs]=/usr/lib/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$
command[check_init_service]=/usr/lib/nagios/plugins/check_init_service $ARG1
command[check_memory]=/usr/lib/nagios/plugins/check_mem.pl -u -w $ARG1$ -c $ARG2$

Regards,
Sudarshan.

[Box293]

Output when i run from the server:

/usr/lib/nagios/plugins/check_mountpoints -A

OK: All mounts were found

Can you please do this as the nagios user and post back the results:

Code: Select all

su nagios
/usr/lib/nagios/plugins/check_mountpoints -A

[shan_1986]

Hello,

Here is the output after executing the plugin as nagios user:

nagios@*****:/home/local/****/****$ /usr/lib/nagios/plugins/check_mountpoints -A
OK: all mounts were found (/mnt/CCR_Common )


Regards,
Sudarshan.