Nagios NRPE
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