Centreon: add a poller

Saturday, 18 February 2012 22:42

Steps to take (some are very specific for me):

make sure ndo2db is working on the central poller
install and configure nagios on a satellite
synchronize/add plugins images and mib files on this satellitersync -avu /usr/local/nagios/libexec/360viewpoint/nagios@{IP_ADDRESS_SATELLITE}:/usr/local/nagios/libexec/360viewpoint rsync -avu /usr/local/nagios/share/images/ nagios@{IP_ADDRESS_SATELLITE}:/usr/local/nagios/share/images rsync -avu /usr/share/snmp/mibs/ root@{IP_ADDRESS_SATELLITE}:/usr/share/snmp/mibs
on the satellite copy the created x86 plugins from libexec to 360viewpoint directory (only when plugins copied from Centreon server are 64_x86 bit and you run on x86)

/bin/cp /usr/local/nagios/libexec/check* /usr/local/nagios/libexec/360viewpoint
In Centreon add a satellite: configuration > centreon
In Centreon add the satellite as a host and add services
In Centreon add ndomod confg file for satellite: configuration > centreon > ndomod.cfginstance_name=poller01 output_type=tcpsocket output=10.0.2.19 tcp_port=5669 output_buffer_items=5000 file_rotation_interval=14400 file_rotation_timeout=60 reconnect_interval=15 reconnect_warning_interval=900 data_processing_options=-1 config_output_options=3
On Centreon make sure file /var/lib/centreon/centreon.cmd is writable by nagios and apache:

chown nagios:nagcmd /var/lib/centreon
On Centreon generate ssh key file:
su - nagios ssh-keygen ssh-copy-id -i ~/.ssh/id_rsa.pub nagios@{IP_ADDRESS_SATELLITE} ssh {IP_ADDRESS} exit exit

On satellite configure sudo (using visudo) in order to allow the central server to manage the Nagios daemon on the satellite monitor
nagios ALL=NOPASSWD: /etc/init.d/nagios restart nagios ALL=NOPASSWD: /etc/init.d/nagios stop nagios ALL=NOPASSWD: /etc/init.d/nagios start nagios ALL=NOPASSWD: /etc/init.d/nagios reload nagios ALL=NOPASSWD: /usr/sbin/nagiostats nagios ALL=NOPASSWD: /usr/sbin/nagios *
On satellite download, Compile and Install NDOMOD

cd /tmp wget http://sourceforge.net/projects/nagios/files/ndoutils-1.x/ndoutils-1.4b9/ndoutils-1.4b9.tar.gz/download tar xvzf ndoutils-1.4b9.tar.gz cd ndoutils-1.4b9 ./configure --codefix=/usr/local/nagios/ --enable-mysql --disable-pgsql --with-ndo2db-user=nagios --with-ndo2db-group=nagios make cp ./src/ndomod-3x.o /usr/local/nagios/bin/ndomod.o chmod 774 /usr/local/nagios/bin/ndo* chown nagios:nagios /usr/local/nagios/bin/ndo* cp config/ndo* /usr/local/nagios/etc/
In Centreon go and activate configuration of the Central Poller and the Satellite.
Check logs on satellite:# tail -f /usr/local/nagios/var/nagios.log [1329614509] Nagios 3.3.1 starting... (PID=12125) [1329614509] Local time is Sun Feb 19 02:21:49 CET 2012 [1329614509] LOG VERSION: 2.0 [1329614509] ndomod: NDOMOD 1.4b9 (10-27-2009) Copyright (c) 2009 Nagios Core Development Team and Community Contributors [1329614509] ndomod: Successfully connected to data sink. 0 queued items to flush. [1329614509] Event broker module '/usr/local/nagios/bin/ndomod.o' initialized successfully. [1329614509] Finished daemonizing... (New PID=12126)Check logs on Centreon:

# tail -f /usr/local/centreon/log/centcore.log24/2/2012 11:57:44 - Start: Send config files on poller 2 24/2/2012 11:57:44 - End: Send config files on poller 2 24/2/2012 11:57:44 - Start: Send Centreon Broker config files on poller 2 24/2/2012 11:57:44 - End: Send Centreon Broker config files on poller 2 24/2/2012 11:57:45 - Init Script : 'sudo /etc/init.d/nagios restart' On poller xxx.xxx.xxx.xxx (2) 24/2/2012 11:57:45 - NAGIOS : Running configuration check...done. 24/2/2012 11:57:45 - NAGIOS : Stopping nagios: done. 24/2/2012 11:57:45 - NAGIOS : Starting nagios: done.

On the satellite (because of a centreon bug?):

mkdir /usr/local/nagios/etc/serviceext/ chown nagios:nagcmd /usr/local/nagios/etc/serviceext/
On the satellite (depending on the configuration of the poller in Centreon):

mkdir /etc/centreon-broker chown root:nagios /etc/centreon-broker chmod 775 /etc/centreon-brokermkdir -p /etc/centreon/broker chown -R root:nagios /etc/centreon chmod -R 775 /etc/centreon
On the satellite (because centcore dumps the files in the serviceext directory and not etc

/etc/init.d/nagios NagiosCfgFile=${prefix}/etc/nagios.cfg to NagiosCfgFile=${prefix}/etc/serviceext/nagios.cfg

Create a blank starting webpage on the root of the webserver.
touch /var/www/html/index.html

Install CPAN module to prevent error with plugins like:
#perl -MCPAN -e shell cpan> install Bundle::CPAN cpan[1]> reload cpan cpan[1]> reload index cpan[1]> install Net::SNMP cpan[1]> install Getopt::Long cpan[1]> install Config::IniFiles
Create SSH tunnel for NDO traffic actions on Satellite
On Satellite as root:

ssh-keygen ssh-copy-id -i /root/.ssh/id_rsa.pub nagios@{IP_ADDRESS_CENTREON} ssh nagios@{IP_ADDRESS_CENTREON} yum -y install autosshMake sure the ndomod.cfg is configured to connect to 127.0.0.1 in stead of {IP_ADDRESS_CENTREON}

Add the following lines to /etc/ssh/ssh_config: Host poller01         Hostname {IP_ADDRESS_CENTREON}         User nagios         CheckHostIP no         LocalForward 5669 127.0.0.1:5669         #LocalForward 514 127.0.0.1:514         Compression yes

As root on the Centreon server:

yum -y install autossh

Add the following lines to /etc/ssh/ssh_config:

Host poller01         Hostname {IP_ADDRESS_CENTREON}         User nagios         CheckHostIP no         LocalForward 5669 127.0.0.1:5669         #LocalForward 514 127.0.0.1:514         Compression yes

Start tunnel:
autossh -N poller01& ->> ???? does not work yet, figuring this out autossh -M 0 -q -f -N -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -L 5669:localhost:5669 nagios@{IP_ADDRESS_CENTREON}

Check Nagios log file:

[1329910951] ndomod: NDOMOD 1.4b9 (10-27-2009) Copyright (c) 2009 Nagios Core Development Team and Community Contributors [1329910951] ndomod: Could not open data sink! I'll keep trying, but some output may get lost... [1329910951] Event broker module '/usr/local/nagios/bin/ndomod.o' initialized successfully. [1329910951] Warning: Service 'CPU' on host '360viewpoint_poll01' has no notification time period defined! [1329910951] Warning: Service 'HTTP' on host '360viewpoint_poll01' has no notification time period defined! [1329910951] Finished daemonizing... (New PID=27511) [1329911863] ndomod: Still unable to connect to data sink. 162 items lost, 5000 queued items to flush. [1329912775] ndomod: Still unable to connect to data sink. 4869 items lost, 5000 queued items to flush. [1329912855] ndomod: Successfully connected to data sink. 5281 items lost, 5000 queued items to flush. [1329912855] ndomod: Successfully flushed 5000 queued items to data sink. # ps ax | grep ssh | grep -v grep 1570 ?        Ss     0:20 /usr/sbin/sshd 21905 ?        Ss     0:00 sshd: nagios [priv] 21907 ?        S      0:00 sshd: nagios 22271 ?        Ss     0:00 sshd: nagios [priv] 22273 ?        S      0:00 sshd: nagios 29128 ?        S      0:00 /usr/bin/ssh -q -N -o ServerAliveInterval 60 -o ServerAliveCountMax 3 -L 11111:localhost:5669 nagios@{IP_ADDRESS_CENTREON}
30492 ?        Ss     0:00 sshd: root@pts/0

Troubleshooting SSH

killall ssh

[1329915500] ndomod: Error writing to data sink! Some output may get lost... [1329915500] ndomod: Please check remote ndo2db log, database connection or SSL Parameters

autossh -M 0 -q -f -N -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -L 11111:localhost:5669 nagios@{IP_ADDRESS_CENTREON}

ps ax | grep ssh | grep -v grep 31288 ? Ss 0:00 autossh -M 0 -q -N -o ServerAliveInterval 60 -o ServerAliveCountMax 3 -L 11111:localhost:5669 nagios@{IP_ADDRESS_CENTREON} 31289 ? S 0:00 /usr/bin/ssh -q -N -o ServerAliveInterval 60 -o ServerAliveCountMax 3 -L 11111:localhost:5669 nagios@{IP_ADDRESS_CENTREON}

[1329915516] ndomod: Successfully reconnected to data sink! 0 items lost, 91 queued items to flush. [1329915516] ndomod: Successfully flushed 91 queued items to data sink.

That's it I hope.

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