RRDtool

Monitoring Connector Assets

Monitored Objects

The Monitoring Connector includes monitoring of Query.

Collected Metrics

Query

Metric name	Description	Unit
dsname#datasource.value.minimum.count	Minimun value on timeframe
dsname#datasource.value.average.count	Average value on timeframe
dsname#datasource.value.maximum.count	Maximul value on timeframe

Prerequisites

The plugin support query with:

• rrdtool cli (executed locally or through ssh)
• perl binding (executed locally only)

rrdcached is not supported (yet).

Setup

Online License

1. Install the Centreon Plugin on every Poller:

yum install centreon-plugin-Applications-Databases-Rrdtool

2. On the Centreon Web interface in Configuration > Monitoring Connectors Manager, install the RRDtool Monitoring Connector

Offline License

1. Install the Centreon Plugin on every Poller:

yum install centreon-plugin-Applications-Databases-Rrdtool

2. On the Centreon Central server, install the Centreon Monitoring Connector from the RPM:

yum install centreon-pack-applications-databases-rrdtool

3. On the Centreon Web interface in Configuration > Monitoring Connectors Manager, install the RRDtool Monitoring Connector

Service configuration

Local

• Create a service and apply the App-DB-Rrdtool-Local-Query service template.

Once the template applied, some Macros have to be configured:

Mandatory	Name	Description
X	RRDFILE	rrd file to query
X	DSNAME	Datasource to query (Default: 'value')
X	TIMEFRAME	Set timeframe in seconds (E.g '3600' to check last 60 minutes) (Default: 600)

SSH

• Create a service and apply the App-DB-Rrdtool-SSH-Query service template.

Once the template applied, some Macros have to be configured:

Mandatory	Name	Description
X	RRDFILE	rrd file to query
X	DSNAME	Datasource to query (Default: 'value')
X	TIMEFRAME	Set timeframe in seconds (E.g '3600' to check last 60 minutes) (Default: 600)

• On your host, 3 SSH backends are available to connect to the remote server: sshcli, plink and libssh which are detailed below.

sshcli backend

Mandatory	Name	Description
X	SSHBACKEND	Name of the backend: sshcli
X	SSHUSERNAME	By default, it uses the user running process centengine on your Poller
	SSHPASSWORD	Cannot be used with backend. Only ssh key authentication
	SSHPORT	By default: 22
	SSHEXTRAOPTIONS	Customize it with your own if needed. E.g.: --ssh-priv-key=/user/.ssh/id_rsa

With that backend, you have to validate the target server fingerprint manually (with the SSHUSERNAME used).

plink backend

Mandatory	Name	Description
X	SSHBACKEND	Name of the backend: plink
X	SSHUSERNAME	By default, it uses the user running process centengine on your Poller
	SSHPASSWORD	Can be used. If not set, SSH key authentication is used
	SSHPORT	By default: 22
	SSHEXTRAOPTIONS	Customize it with your own if needed. E.g.: --ssh-priv-key=/user/.ssh/id_rsa

With that backend, you have to validate the target server fingerprint manually (with the SSHUSERNAME used).

libssh backend (default)

Mandatory	Name	Description
X	SSHBACKEND	Name of the backend: libssh
X	SSHUSERNAME	By default, it uses the user running process centengine on your Poller
	SSHPASSWORD	Can be used. If not set, SSH key authentication is used
	SSHPORT	By default: 22
	SSHEXTRAOPTIONS	Customize it with your own if needed. E.g.: --ssh-priv-key=/user/.ssh/id_rsa

With that backend, you do not have to validate the target server fingerprint manually.

FAQ

How to check in the CLI that the configuration is OK and what are the main options for ?

Once the Plugin installed, log into your poller using the centreon-engine user account and test by running the following command:

/usr/lib/centreon/plugins/centreon_rrdtool.pl \
    --plugin=database::rrdtool::local::plugin \
    --custommode=perlmod \
    --mode=query \
    --rrd-file='/var/lib/centreon/metrics/1490.rrd' \
    --ds-name='value' \
    --timeframe='3600' \
    --warning-value-maximum=50 \
    --critical-value-maximum=100

Output example:

OK: datasource 'value': 3.12 (min), 4.52 (avg), 5.13 (max) | 'value#datasource.value.minimum.count'=3.12;;;; 'value#datasource.value.average.count'=4.52;;;; 'value#datasource.value.maximum.count'=5.13;0:50;0:100;;

The command above monitors rrdtool (--mode=query) database /var/lib/centreon/metrics/1490.rrd (found Centreon metrics file in interface: Administration > Parameters > Data).

It check the datasource value (--ds-name='value'. Centreon always use value. Otherwise use command to find datasource name: rrdtool info /var/lib/centreon/metrics/1490.rrd) during the last hour (--timeframe='3600').

This command would trigger a WARNING alert if maximum value is over 50 (--warning-value-maximum=50) and a CRITICAL alarm over 100 (--critical-value-maximum=100).

All the options that can be used with this plugin can be found over the --help command:

/usr/lib/centreon/plugins/centreon_rrdtool.pl \
    --plugin=database::rrdtool::local::plugin \
    --custommode=perlmod \
    --help