NDOUtils : Envoyer les états en base de donnée

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1 Introduction

NDO est un module additionnel permettant à Nagios d’écrire dans une base de données l’état des machines et services à superviser.

NDO est composé de deux modules: NDOMOD et NDO2DB.

NDOMOD doit être lancé sur le serveur Nagios et permet de récupérer les informations remontées par Nagios pour les transmettre via TCP (ou un socket Unix) vers NDO2DB.

NDO2DB est un daemon qui écoute sur un port TCP (ou un socket Unix) et écrit les données recues dans une base de donnée (MySQL ou PgSQL).

2 Installation

Nous allons partir du principe que vous avez un Nagios d'installé et configuré. Il nous faut donc installer NDOUtils :

Command 
aptitude install ndoutils ndoutils-mysql

Avec ceci nous allons pouvoir stocker en base de donnée MySQL.

3 Configuration

3.1 Default

Éditez le fichier /etc/default/ndoutils et vérifiez que cette valeur est bien à 1 :

Configuration File /etc/default/ndoutils 
...
ENABLE_NDOUTILS=1
..

3.2 ndo2db.cfg

Configurez la base de donnée pour ndo2db. Normalement toutes les infos pour la base ont été pré remplies lors de l'installation d'NDOUtils. Cependant, nous allons effectuer quelques petits ajustements :

Configuration File /etc/nagios3/ndo2db.cfg 
#####################################################################
# NDO2DB DAEMON CONFIG FILE
#
# Last Modified: 10-29-2007
#####################################################################

# USER/GROUP PRIVILIGES
# These options determine the user/group that the daemon should run as.
# You can specify a number (uid/gid) or a name for either option.

ndo2db_user=nagios
ndo2db_group=nagios

# SOCKET TYPE
# This option determines what type of socket the daemon will create
# an accept connections from.
# Value:
#   unix = Unix domain socket (default)
#   tcp  = TCP socket

#socket_type=unix
socket_type=tcp

# SOCKET NAME
# This option determines the name and path of the UNIX domain 
# socket that the daemon will create and accept connections from.
# This option is only valid if the socket type specified above
# is "unix".

socket_name=/var/cache/nagios3/ndo.sock

# TCP PORT
# This option determines what port the daemon will listen for
# connections on.  This option is only vlaid if the socket type
# specified above is "tcp".

tcp_port=5668

# DATABASE SERVER TYPE
# This option determines what type of DB server the daemon should
# connect to.
# Values:
# 	mysql = MySQL
#       pgsql = PostgreSQL

db_servertype=mysql

# DATABASE HOST
# This option specifies what host the DB server is running on.

db_host=localhost

# DATABASE PORT
# This option specifies the port that the DB server is running on.
# Values:
# 	3306 = Default MySQL port
#	5432 = Default PostgreSQL port

db_port=3306

# DATABASE NAME
# This option specifies the name of the database that should be used.

db_name=ndoutils

# DATABASE TABLE PREFIX
# Determines the prefix (if any) that should be prepended to table names.
# If you modify the table prefix, you'll need to modify the SQL script for
# creating the database!

db_prefix=nagios_

# DATABASE USERNAME/PASSWORD
# This is the username/password that will be used to authenticate to the DB.
# The user needs at least SELECT, INSERT, UPDATE, and DELETE privileges on
# the database.

db_user=ndoutils
db_pass=password

## TABLE TRIMMING OPTIONS
# Several database tables containing Nagios event data can become quite large
# over time.  Most admins will want to trim these tables and keep only a
# certain amount of data in them.  The options below are used to specify the
# age (in MINUTES) that data should be allowd to remain in various tables
# before it is deleted.  Using a value of zero (0) for any value means that
# that particular table should NOT be automatically trimmed.

# Keep timed events for 24 hours
max_timedevents_age=1440

# Keep system commands for 1 week
max_systemcommands_age=10080

# Keep service checks for 1 week
max_servicechecks_age=10080

# Keep host checks for 1 week
max_hostchecks_age=10080

# Keep event handlers for 31 days
max_eventhandlers_age=44640

# DEBUG LEVEL
# This option determines how much (if any) debugging information will
# be written to the debug file.  OR values together to log multiple
# types of information.
# Values: -1 = Everything
#          0 = Nothing
#          1 = Process info
#	   2 = SQL queries

debug_level=0

# DEBUG VERBOSITY
# This option determines how verbose the debug log out will be.
# Values: 0 = Brief output
#         1 = More detailed
#         2 = Very detailed

debug_verbosity=0

# DEBUG FILE
# This option determines where the daemon should write debugging information.

debug_file=@localstatedir@/ndo2db.debug

# MAX DEBUG FILE SIZE
# This option determines the maximum size (in bytes) of the debug file.  If
# the file grows larger than this size, it will be renamed with a .old
# extension.  If a file already exists with a .old extension it will
# automatically be deleted.  This helps ensure your disk space usage doesn't
# get out of control when debugging.

max_debug_file_size=1000000

3.3 ndomod.cfg

Puis le NDOMOD :

Configuration File /etc/nagios3/ndomod.cfg 
#####################################################################
# NDOMOD CONFIG FILE
#
# Last Modified: 09-05-2007
#####################################################################


# INSTANCE NAME
# This option identifies the "name" associated with this particular
# instance of Nagios and is used to seperate data coming from multiple
# instances.  Defaults to 'default' (without quotes).

instance_name=default



# OUTPUT TYPE
# This option determines what type of output sink the NDO NEB module
# should use for data output.  Valid options include:
#   file       = standard text file
#   tcpsocket  = TCP socket
#   unixsocket = UNIX domain socket (default)

#output_type=file
output_type=tcpsocket
#output_type=unixsocket



# OUTPUT
# This option determines the name and path of the file or UNIX domain 
# socket to which output will be sent if the output type option specified
# above is "file" or "unixsocket", respectively.  If the output type
# option is "tcpsocket", this option is used to specify the IP address
# of fully qualified domain name of the host that the module should
# connect to for sending output.

#output=/var/cache/nagios2/ndo.dat
output=127.0.0.1
#output=/var/cache/nagios3/ndo.sock



# TCP PORT
# This option determines what port the module will connect to in
# order to send output.  This option is only vlaid if the output type
# option specified above is "tcpsocket".

tcp_port=5668



# OUTPUT BUFFER
# This option determines the size of the output buffer, which will help
# prevent data from getting lost if there is a temporary disconnect from
# the data sink.  The number of items specified here is the number of
# lines (each of variable size) of output that will be buffered.

output_buffer_items=5000



# BUFFER FILE
# This option is used to specify a file which will be used to store the
# contents of buffered data which could not be sent to the NDO2DB daemon
# before Nagios shuts down.  Prior to shutting down, the NDO NEB module
# will write all buffered data to this file for later processing.  When
# Nagios (re)starts, the NDO NEB module will read the contents of this
# file and send it to the NDO2DB daemon for processing.

buffer_file=/var/cache/nagios3/ndomod.tmp



# FILE ROTATION INTERVAL
# This option determines how often (in seconds) the output file is
# rotated by Nagios.  File rotation is handled by Nagios by executing
# the command defined by the file_rotation_command option.  This
# option has no effect if the output_type option is a socket.

file_rotation_interval=14400



# FILE ROTATION COMMAND
# This option specified the command (as defined in Nagios) that is
# used to rotate the output file at the interval specified by the
# file_rotation_interval option.  This option has no effect if the
# output_type option is a socket.
#
# See the file 'misccommands.cfg' for an example command definition
# that you can use to rotate the log file.

#file_rotation_command=rotate_ndo_log



# FILE ROTATION TIMEOUT
# This option specified the maximum number of seconds that the file
# rotation command should be allowed to run before being prematurely
# terminated.

file_rotation_timeout=60



# RECONNECT INTERVAL
# This option determines how often (in seconds) that the NDO NEB
# module will attempt to re-connect to the output file or socket if
# a connection to it is lost.

reconnect_interval=15



# RECONNECT WARNING INTERVAL
# This option determines how often (in seconds) a warning message will
# be logged to the Nagios log file if a connection to the output file
# or socket cannot be re-established.

reconnect_warning_interval=15
#reconnect_warning_interval=900



# DATA PROCESSING OPTION
# This option determines what data the NDO NEB module will process. 
# Do not mess with this option unless you know what you're doing!!!!
# Read the source code (include/ndbxtmod.h) to determine what values
# to use here.  Values from source code should be OR'ed to get the
# value to use here.  A value of -1 will cause all data to be processed.
# Read the source code (include/ndomod.h) and look for "NDOMOD_PROCESS_"
# to determine what values to use here.  Values from source code should
# be OR'ed to get the value to use here.  A value of -1 will cause all
# data to be processed. 

data_processing_options=-1



# CONFIG OUTPUT OPTION
# This option determines what types of configuration data the NDO
# NEB module will dump from Nagios.  Values can be OR'ed together.
# Values: 
# 	  0 = Don't dump any configuration information
#         1 = Dump only original config (from config files)
#         2 = Dump config only after retained information has been restored
#         3 = Dump both original and retained configuration

config_output_options=2

3.4 nagios.cfg

Et pour finir, nous allons éditer le fichier nagios.cfg :

Configuration File /etc/nagios3/nagios.cfg 
event_broker_options=-1
broker_module=/usr/lib/ndoutils/ndomod-mysql-3x.o config_file=/etc/nagios3/ndomod.cfg

4 Redémarrage

Pour terminer, il faut redémarrer le service ndoutils. Personnellement j'ai eu trop de déboires à la con dans le syslog du type : 

nagios3: ndomod: Still unable to connect to data sink.  1325744 items lost, 5000 queued items to flush.

Et en fait après un reboot de la machine, tout s'est mis à fonctionner correctement (la base s'est remplie).

5 Ressources

http://blog.nicolargo.com/2009/02/pour-en-finir-avec-ndo.html

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