Nagios NRPE

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	This howto or contrib has not been reviewed and might contain code that could harm your installation. For more information on the review process have a look at the Development Review page.

Maintainer

Michael Weinberger

Introduction

This Document describes the installation of the Nagios Remote Plugin Executer (NRPE) installation on a SME server to be monitored by a Nagios server.

Download

Download the packages and files from http://mirror.contribs.org/smeserver/contribs/michaelw/sme7/Nagios3/packages/ manually or run the the script wgetall to download all in one go.

bash < wgetall

Installation

Configure the dag repositoy

The following command will configure the dag repository on SME Server. EDIT NOT COMPLETE!

To create an entry in the database for the epel repository we open put the following commands in a terminal window or in a shell window:

/sbin/e-smith/db yum_repositories set epel repository \

Name 'SME Server - epel' \
BaseURL 'http://<http://download.fedoraproject.org/pub/epel/7/$basearch' \
EnableGroups yes \
GPGCheck yes \
Visible no \
status disabled

To enable the changes:

    signal-event yum-modify

Just to be sure, give yum a fresh start:

    yum clean all

After adding it to the database we have to update the changes to the configuration file:

signal-event yum-modify

NRPE installation

/usr/bin/yum --enablerepo=dag install \
 nagios-plugins \
 nagios-plugins-setuid \
 perl-Config-Tiny \
 perl-Class-Accessor

/usr/bin/yum --enablerepo=dag localinstall \
 smeserver-nagios-nrpe-*.noarch.rpm \
 smeserver-nagios-backup-*.noarch.rpm \
 perl-Nagios-Plugin-*.noarch.rpm \
 smeserver-nagios-plugins-mysql-*.noarch.rpm \
 nagios-plugins-generic-*.noarch.rpm  \
 nagios-of-plugins-*.noarch.rpm

NRPE configuration

Create a the NRPE configuration file /etc/nagios/nrpe.cfg. Use the nrpe.cfg provided by this conrib as a starting point. Add the IP address of your central Nagios server to the variable allowed_hosts. Use the local IP of the central Nagios server if you check the server over the local network or over a VPN, otherwise use the WAN IP.

Allow the central Nagios server to access the NRPE service

Add the IP address of the your central Nagios to Local Networks in the server-manager.

Configure the TCP wrapper. This is required for SSL connections to the NRPE.

config set nrpe service
config setprop nrpe HostsAllow "127.0.0.1 NAGIOS_CENTRAL_SERVER_IP"
expand-template /etc/hosts.allow

Allow the Nagios plugins to be executed as root (optional)

A few plugins only work when they are executed as root. This configures the sudoers configuration.

config setprop nrpe sudoPlugins yes
expand-template /etc/sudoers

Start the service

service nrpe restart

If the NRPE SME server is behind a firewall, you must forward port 5666/tcp to the server.
Test the installation by running this command on the central Nagios server:

/usr/lib/nagios/plugins/check_nrpe -H IPADDRESS

Expected result:

NRPE v2.5.1

Uninstall

This removes the installed Nagios packages.

service nrpe stop

rpm -e \
 nagios \
 smeserver-nagios-nrpe \
 smeserver-nagios-backup \
 nagios-plugins-nrpe \
 nagios-of-plugins \
 nagios-plugins-generic \
 nagios-plugins-setuid \
 nagios-plugins-temptrax \
 perl-Nagios-Plugin \
 smeserver-nagios-plugins-mysql

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