Installing NRPE via RPM
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[edit] Overview
This HOWTO will describe how to use rpm to install Nagios' NRPE client on RHEL-based servers. This approach is necessary in the event that you cannot use yum or RPMforge on production RH or CentOS servers.
[edit] RPM
Before you can install Nagios, you must first d/l the appropriate rpm for your distro (Red Hat, Fedora, CentOS) and architecture (32/64 bit, etc).
- nagios-plugins RPM packages for Red Hat, CentOS and Fedora
- Depending on which plugins you want to use, you may have to add the following relevant RPMs: bind-utils, mysql, net-snmp-utils, ntp, openldap, openssh-clients, openssl, postgresql-libs qstat, radiusclient, samba-client, sendmail (beyond the scope of this HOWTO)
[edit] Installing RPMs on Monitored Server
Once you have wget'd the appropriate RPM, install the RPMs in the following order: fping, Net-SNMP, nagios-plugins, nagios-nrpe
- Install fping
- rpm -ivh fping-2.4-1.b2.0.el2.rf.i386.rpm
- Install Net-SNMP
- perl -MCPAN -e shell #This will give you a cpan shell to install perl modules
- install Net::SNMP
- At the cpan shell, type this command to install the needed perl module
- Note that you you will prompted to setup cpan if this is your first time
- Press enter to select the default value for the cpan setup.
- In the setup of cpan, select atleast 3 good mirrors cpan will grab files from
- the selection will be space delimited
- Install nagios plugins:
- rpm -ivh nagios-plugins-1.4-2.0.el2.rf.i386.rpm
- Install nrpe
- rpm -ivh nagios-nrpe-2.0-3.rhel2.1.dag.i386.rpm
- configure /etc/nagios/nrpe.cfg
- vi /etc/nagios.cfg, then change your NRPE file handlers (e.g. command[check_load]=/path/to/plugins). Then add the relevant check_nrpe check (e.g. check_nrpe -c check_load ...) one your main Nagios server.
- (optional) If you already have another properly configured nrpe.cfg file from another server, then copy it over using secure copy (scp).
- scp root@box.domain.com:/etc/nagios/nrpe.cfg /etc/nagios (if not work, check firewall settings: e.g. iptables -L)
- start the service with one of the following commands
- /etc/init.d/nrpe start # "Linux way" of starting services
- service nrpe start
- start nrpe upon each boot
- chkconfig --level 235 nrpe on
[edit] On Nagios Server
- test the plugin via check_nrpe at the command line (e.g.)
- cd /usr/lib/nagios/plugins
- ./check_nrpe -H RHELbox.domain.com -c check_whatever (note: check_whatever is the name of the NRPE file handler you defined in the /etc/nrpe.cfg file on your RHEL box)
- If have problems connecting to nrpe, make sure RHEL box port is open and that you are using the right password (-s).
- e.g. telnet rhelbox.domain.com 12489
- Once this tests out, then add appropriate check to your /etc/nagios/localhosts.cfg (or equiv).
