I have been using Nagios and check_qmailq for a very long time, however I recently moved to another Linux (Gentoo) box and now the plug-in does not work. This Linux box is the exact same box of the others that are working, and everything is configured identically, so I'm scratching my head on this one. I have poured through every possible knowledge base and help thread I could find, but none of them has helped me thus far. No firewall running, that is not the issue. Permission are set correctly for the folders specified (nagios:nagios) and read/execute is set. All other plug-ins I'm using on that server work just fine, it's just the check_qmailq plugin. I don't use SUDO, so that is not the issue.
If I run this command on the troubled box, it works.
/usr/lib/nagios/plugins/check_qmailq -w 20 -c 30
Returns
QMAILQ OK - messages in queue: 1 messages in queue but not yet preprocessed: 0
However when I try to run this on the remote Nagios server to this box, I receive the following error.
/usr/lib/nagios/plugins/./check_nrpe -H 192.168.x.x -c check_qmailq
Returns
NRPE: Unable to read output
I've been struggling for two days with this issue, I've giving up trying to resolve this without some outside help. If anyone can help me, I will be in your debt forever.
I am appending the nrpe.cfg and the debug output. See below.
Code: Select all
---------------NRPE.CFG-------------------------------------------------------------------------------------------
#############################################################################
# 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=/run/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. Network addresses with a bit mask
# (i.e. 192.168.1.0/24) are also supported. Hostname wildcards are not currently
# supported.
#
# 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=127.0.0.1,10.5.0.0/16,192.168.1.0/24,192.168.100.0/24,192.168.116.0/24
# 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=0
# BASH COMMAND SUBTITUTION
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments that contain bash command substitutions of the form
# $(...). This option only works if the daemon was configured with both
# the --enable-command-args and --enable-bash-command-substitution configure
# script options.
#
# *** ENABLING THIS OPTION IS A HIGH SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow bash command substitutions,
# 1=allow bash command substitutions
allow_bash_command_substitution=0
# 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=160
# 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=<somefile.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_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1
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 -w 150 -c 200
command[check_qmailq]=/usr/lib/nagios/plugins/check_qmailq -w 20 -c 30
# 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 $ARG3$-----------------debug output messages----------------------------------------------------------------------------------
r 2 11:00:48 mail1 nrpe[1430]: Host is asking for command 'check_qmailq' to be run...
Mar 2 11:00:48 mail1 nrpe[1430]: Running command: /usr/lib/nagios/plugins/check_qmailq -w 20 -c 30
Mar 2 11:00:48 mail1 nrpe[1430]: Command completed with return code 2 and output:
Mar 2 11:00:48 mail1 nrpe[1430]: Sending response - bytes left: 27
Mar 2 11:00:48 mail1 nrpe[1430]: Return Code: 2, Output: NRPE: Unable to read output
Mar 2 11:00:48 mail1 nrpe[1430]: Connection from }▒▒▒{▒▒yG▒▒▒{▒▒^Y▒▒ closed.
Mar 2 11:03:33 mail1 nrpe[1532]: Connection from 192.168.x.x port 7115
Mar 2 11:03:33 mail1 nrpe[1532]: Host address is in allowed_hosts
Mar 2 11:03:33 mail1 nrpe[1532]: Handling the connection...
Mar 2 11:03:33 mail1 nrpe[1532]: Host is asking for command 'check_qmailq' to be run...
Mar 2 11:03:33 mail1 nrpe[1532]: Running command: /usr/lib/nagios/plugins/check_qmailq -w 20 -c 30
Mar 2 11:03:33 mail1 nrpe[1532]: Command completed with return code 2 and output:
Mar 2 11:03:33 mail1 nrpe[1532]: Sending response - bytes left: 27
Mar 2 11:03:33 mail1 nrpe[1532]: Return Code: 2, Output: NRPE: Unable to read output
Mar 2 11:03:33 mail1 nrpe[1532]: Connection from }▒▒▒{▒▒yG▒▒▒{▒▒^Y▒▒ closed.
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