NRPE Chcek_Memory on Linix

[rkennedy]

What are the permissions on the file, on the Pi? ls -la /usr/local/nagios/libexec/check_mem.sh

Also, when you run it over the CLI from the Nagios machine, look at /var/log/messages on the Pi and it should provide more information about the erorr.

[kwhogster]

root@raspberrypi:/usr/local/nagios/libexec# ls -la /usr/local/nagios/libexec/check_mem.sh
-rwxr-xr-x 1 pi pi 3420 Aug 19 18:26 /usr/local/nagios/libexec/check_mem.sh
root@raspberrypi:/usr/local/nagios/libexec#


root@raspberrypi:/usr/local/nagios/libexec# cat /var/log/messages
Aug 21 06:25:16 raspberrypi rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="3486" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
Aug 22 06:25:15 raspberrypi rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="3486" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
Aug 23 06:25:15 raspberrypi rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="3486" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
Aug 24 06:25:15 raspberrypi rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="3486" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
root@raspberrypi:/usr/local/nagios/libexec#

???????

Thanks

[rkennedy]

Now try running -

Code: Select all

su nagios
/usr/local/nagios/libexec/check_mem.sh -w 80 -c 90

Let us know the full output.

[kwhogster]

pi@raspberrypi ~ $ su nagios
Password:
nagios@raspberrypi /home/pi $ /usr/local/nagios/libexec/check_mem.sh -w 80 -c 90[MEMORY] Total: 434 MB - Used: 177 MB - 40% [SWAP] Total: 99 MB - Used: 0 MB - 0% | MTOTAL=455725056;;;; MUSED=185188352;;;; MCACHE=114307072;;;; MBUFFER=132415488;;;; STOTAL=104853504;;;; SUSED=45056;;;;


I even did this

exit
pi@raspberrypi ~ $ /usr/local/nagios/libexec/check_mem.sh -w 80 -c 90
[MEMORY] Total: 434 MB - Used: 175 MB - 40% [SWAP] Total: 99 MB - Used: 0 MB - 0% | MTOTAL=455725056;;;; MUSED=183242752;;;; MCACHE=114311168;;;; MBUFFER=132419584;;;; STOTAL=104853504;;;; SUSED=45056;;;;

[lmiltchev]

Can you post the entire "/etc/nagios/nrpe.cfg" file?

[kwhogster]

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#############################################################################
# Sample NRPE Config File
# Written by: Ethan Galstad (nagios@nagios.org)
#
# 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=127.0.0.1,10.2.8.72



# 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=10.2.8.79



# 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=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=<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


# 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_mem]=/usr/local/nagios/libexec/check_mem.sh -w $ARG1$ -c $ARG2$

#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 $ARG3$

#
# local configuration:
#       if you'd prefer, you can instead place directives here
include=/etc/nagios/nrpe_local.cfg

#
# you can place your config snipplets into nrpe.d/
# only snipplets ending in .cfg will get included
include_dir=/etc/nagios/nrpe.d/

[Box293]

Code: Select all

command[check_mem]=/usr/local/nagios/libexec/check_mem.sh -w $ARG1$ -c $ARG2$

At the command line on the Nagios host you are executing this:

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/usr/lib/nagios/plugins/check_nrpe -H 10.2.8.7 -t 30 -c check_mem -a '-w 80% -c 90%'

This:

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'-w 80% -c 90%'

is being received as $ARG1$ as it is enclosed in single quotes.
NRPE is then executing this:

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/usr/local/nagios/libexec/check_mem.sh -w -w 80% -c 90% -c

Even if you took the single quotes away, you would then be sending 4 arguments:
$ARG1$ = -w
$ARG2$ = 80%
$ARG3$ = -c
$ARG4$ = 90%

Which would cause NRPE to execute this:

Code: Select all

/usr/local/nagios/libexec/check_mem.sh -w -w -c 80%

It ignores $ARG3$ and $ARG4$ because the command does not have them defined.

You need to execute NRPE as follows:

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/usr/lib/nagios/plugins/check_nrpe -H 10.2.8.7 -t 30 -c check_mem -a '80%' '90%'

I've enclosed the values in single quotes as the % signs can cause issues. This will make NRPE to execute this:

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/usr/local/nagios/libexec/check_mem.sh -w 90% -c 90%

It should work at this point.

[kwhogster]

From my Nagios Server I ran this

root@tgcs017:/usr/local/nagios/etc/objects# /usr/lib/nagios/plugins/check_nrpe -H 10.2.8.7 -t 30 -c check_mem -a '80%' '90%'
NRPE: Unable to read output
root@tgcs017:/usr/local/nagios/etc/objects# /usr/lib/nagios/plugins/check_nrpe -H 10.2.8.72 -t 30 -c check_mem -a '80%' '90%'
CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages.
root@tgcs017:/usr/local/nagios/etc/objects#


10.2.8.7 is SUSE Linux

10.2.8.72 is Raspbian on my Raspberry PI



On Nagios
No handler for command: 90%

define service {
host_name RaspberryPi
service_description Check Memory Used Physical
check_command check_nrpe!check_mem! -a -w '80%' -c '90%'
check_interval 1
servicegroups MemUsage
use generic-service
}

[Box293]

pi@raspberrypi ~ $ su nagios
Password:
nagios@raspberrypi /home/pi $ /usr/local/nagios/libexec/check_mem.sh -w 80 -c 90[MEMORY] Total: 434 MB - Used: 177 MB - 40% [SWAP] Total: 99 MB - Used: 0 MB - 0% | MTOTAL=455725056;;;; MUSED=185188352;;;; MCACHE=114307072;;;; MBUFFER=132415488;;;; STOTAL=104853504;;;; SUSED=45056;;;;


I even did this

exit
pi@raspberrypi ~ $ /usr/local/nagios/libexec/check_mem.sh -w 80 -c 90
[MEMORY] Total: 434 MB - Used: 175 MB - 40% [SWAP] Total: 99 MB - Used: 0 MB - 0% | MTOTAL=455725056;;;; MUSED=183242752;;;; MCACHE=114311168;;;; MBUFFER=132419584;;;; STOTAL=104853504;;;; SUSED=45056;;;;

For the Pi, try it without the % signs

Code: Select all

/usr/lib/nagios/plugins/check_nrpe -H 10.2.8.7 -t 30 -c check_mem -a 80 90

[kwhogster]

I tried both the Pi did not work

root@tgcs017:/usr/local/nagios/etc/objects# /usr/lib/nagios/plugins/check_nrpe -H 10.2.8.7 -t 30 -c check_mem -a 80 90
[MEMORY] Total: 576 MB - Used: 154 MB - 26% [SWAP] Total: 133 MB - Used: 5 MB - 4% | MTOTAL=604598272;;;; MUSED=159191040;;;; MCACHE=95244288;;;; MBUFFER=92229632;;;; STOTAL=140505088;;;; SUSED=5779456;;;;

root@tgcs017:/usr/local/nagios/etc/objects# /usr/lib/nagios/plugins/check_nrpe -H 10.2.8.72 -t 30 -c check_mem -a 80 90
CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages.

root@tgcs017:/usr/local/nagios/etc/objects#