Monitoring IPCop via nrpe

[mkot]

Hi, I found plugin for monitoring IPCop via nrpe plugin:
http://ipcop.stankowic-development.net/index_en.php. I can't find manual how to do this. I installed plugin, configured nrpe.cfg at IPCop and added services for monitoring /dev/md0, /dev/md1 disks but I get

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(Return code of 255 is out of bounds) 

. How should I configure it properly?

Oh, when I run

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root@router-wa-vectra:~ #  /var/ipcop/addons/nrpe/plugins/check_disk -w 20 -c 10 -p /dev/md0
DISK OK - free space: / 144 MB (24% inode=70%);| /=452MB;608;618;0;628

I get good info.

[slansing]

Can you show us an example of the command that is failing? We really need to see how you are running it. Additionally that error is generally thrown when a plugin is not executable, have you made it executable on the remote server?

[mkot]

Hi, acctually I disabled nrpe, because it caused issues with passive checks via nsca client - http://support.nagios.com/forum/viewtop ... =7&t=26251. So I'll try figure out wtf is going on

Is there a procedure for configuring nsca at linux hosts? I'd like to monitor HDD (e.g. /, /home, /mnt/backup), CPU and MEM usage but I can't find simple procedure for this

[abrist]

Have you seen this following doc?
http://nagios.sourceforge.net/download/ ... _Setup.pdf

[mkot]

Yes, I found this http://nagios.sourceforge.net/download/ ... _Setup.pdf but I stuck at page 5 - configuration service at host machine :/ I'll try figure it out how to do it.


EDIT:
Sorry, but I don't get it. How should I configure nsca at remote host which should be monitoring via passive checks? In this pdf I can see how to configure localhost (Nagios server?) but how should I configure other hosts?

[mkot]

Can you show us an example of the command that is failing? We really need to see how you are running it. Additionally that error is generally thrown when a plugin is not executable, have you made it executable on the remote server?

And commands for this (only for HDD):

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command[check_/]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/md0
command[check_/var/log]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/md1

[slansing]

What is giving you trouble on page 5? We can help you out!

[mkot]

Bassically I dont get it. I know I have to create command, template service for this command and service for checking stuff send from hosts. But what should I do at host side? Configure nsca (send_nsca.cfg, nsca.cfg, xinet.d), but what next? Where should I add commands for sending informations from host to serwer?

At nrpe in host I had nrpe.cfg file where I had to add some command which return some values:

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command[check_mem]=/usr/local/nagios/libexec/check_mem.pl -w 98 -c 99
command[check_cpu]=/usr/local/nagios/libexec/check_cpu.sh -w 98 -c 99
command[check_/]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_dfagcaei1

But how is it done in nsca???

[slansing]

So essentially what you need to do now, is create a host, and services that match what is being sent in by the NSCA packets, you should have tested this further up in the document to see what is sent over to the nagios server, and from that, you would name your host/services. Nagios will then push data from the NSCA packets being send in from the remote host, to those services with updated status information each time nsca runs the checks on that host. The packet, and it's output you checked for in the log, should match similar to this:

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<hostname>[tab]<svc_description>[tab]<return_code>[tab]<plugin_output>[newline]

[mkot]

Ok, I managed to set up monitoring Windows hosts via nsca, sample code:

commands.cfg

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# Dodane 2014-03-26 - mkot
# 'check_nsca' command definition for passive hosts checking
define command{
        command_name    check_nsca
        command_line    $USER1$/check_nsca -H $HOSTADDRESS$ -c $ARG1$ -t 20
        }
# KONIEC - 2014-03-26 - mkot

TAIWA.cfg (one of hosts' definition cfg file)

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# Create a service for monitoring CPU load
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service,nagiosgraph
        hostgroup_name          TAIWA
        service_description     CPU Load
        check_command           check_nsca!CPU Load
        notification_options    w,c
        flap_detection_enabled  0
        active_checks_enabled   0
        passive_checks_enabled  1
        }

# Create a service for monitoring memory usage
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service,nagiosgraph
        hostgroup_name          TAIWA
        service_description     MEM Load
        check_command           check_nsca!MEM Load
        notification_options    w,c
        flap_detection_enabled  0
        active_checks_enabled   0
        passive_checks_enabled  1
        }

# Create a service for monitoring C:\ disk usage
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service,nagiosgraph
        hostgroup_name          TAIWA
        service_description     DISK Load C
        check_command           check_nsca!DISK Load C
        notification_options    w,c
        flap_detection_enabled  0
        active_checks_enabled   0
        passive_checks_enabled  1
        }

NSC.ini and nsclient.ini

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NSC.ini
CPU Load=checkCPU warn=50 crit=80 time=20m time=10s time=4
MEM Load=checkMem MaxWarn=85% MaxCrit=90% ShowAll type=physical
DISK Load C=CheckDriveSize MinWarn=2% MinCrit=1% Drive=C FilterType=FIXED

nsclient.ini
; alias_cpu - Alias for alias_cpu. To configure this item add a section called: /settings/external scripts/alias/alias_cpu
alias_cpu = checkCPU warn=50 crit=80 time=5m time=1m time=30s

; alias_disk - Alias for alias_disk. To configure this item add a section called: /settings/external scripts/alias/alias_disk
alias_disk_c = CheckDriveSize MinWarn=2% MinCrit=1% Drive=C FilterType=FIXED

; alias_mem - Alias for alias_mem. To configure this item add a section called: /settings/external scripts/alias/alias_mem
alias_mem = checkMem MaxWarn=85% MaxCrit=90% ShowAll=long type=physical

CPU Load=alias_cpu
MEM Load=alias_mem
DISK Load C=alias_disk_c

Now I want make Active checking for Linux servers (Ubuntu, CentOS, FreeBSD, IPCop (firewall - http://www.ipcop.org/)). I added command for checking nrpe in commands.cfg file:

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# Dodane 2014-03-06 - mkot
# 'check_nrpe' command definition for active hosts checking
define command{
        command_name    check_nrpe
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -t 20
        }

and added some piece of code to linux.cfg file:

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# Użycie dysków twardych #
# główna partycja - /
define service{
        use                     local-service
        host_name               domena-wa, router-wa-vectra
        service_description     /
        check_command           check_nrpe!check_/
        notifications_enabled   1
        flap_detection_enabled  0
        active_checks_enabled   1
        passive_checks_enabled  0
        }

At Linux host I installed nrpe addon with xinetd, the configuration is:
- added: user/group

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nagios/nagios

- /etc/xinet.d/nrpe

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# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port            = 5666
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
        only_from       = <IP_Nagios_Server>
}

- /usr/local/nagios/etc/nrpe.cfg

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log_facility=daemon

pid_file=/var/run/nrpe.pid

server_port=5666

nrpe_user=nagios

nrpe_group=nagios

allowed_hosts=<IP_Nagios_Server>

dont_blame_nrpe=0

allow_bash_command_substitution=0

debug=1

command_timeout=60

connection_timeout=300

command[check_/]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_dfagcaei1
#command[check_/mnt/backup]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/sda1
#command[check_/home]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_dfagcaei6
#command[check_/home/domena/raporty]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_jifggjdg6
#command[check_/home/domena/wymiana_miedzyoddzial]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_jifggjdg5
#command[check_raid]=/usr/local/nagios/libexec/check_raid
#command[check_mem]=/usr/local/nagios/libexec/check_mem.pl -w 98 -c 99
#command[check_cpu]=/usr/local/nagios/libexec/check_cpu.sh -w 98 -c 99

-/etc/services

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nrpe  5666/tcp #nrpe

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root@domena-wa:~# netstat -an |grep 5666
tcp        0      0 0.0.0.0:5666            0.0.0.0:*               LISTEN

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root@domena-wa:~# ps aux |grep nrpe
root      6295  0.0  0.0   5708   768 pts/0    S+   21:16   0:00 grep --color=auto nrpe

And this is not working correctly, I get status OK with status information:

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(Return code of 255 is out of bounds) 

EDIT:
Code from /var/log/syslog from Nagios Server

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Mar 26 22:11:18 nagios nagios: Warning: Return code of 255 for check of service '/' on host 'domena-wa' was out of bounds.

Code from /var/log/syslog from monitored Linux Ubuntu Server:

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Mar 26 20:49:47 domena-wa nrpe[5778]: Added command[check_/]=/usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_dfagcaei1

When I run /usr/local/nagios/libexec/check_disk -w 1% -c 0% -p /dev/mapper/pdc_dfagcaei1 at LUS I get:

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DISK OK - free space: / 32982 MB (74% inode=96%);| /=11567MB;46463;46933;0;46933