Monitor RaspBerry Pi with Nagios

Introduction

Over the past week, I had multiple questions how to monitor RaspBerry Pi with Nagios. Monitoring is crucial to pro-actively find out any issues that might come up. There are multiple ways to achieve this. I’ll try to build up this ‘how to’ from the ground, starting with using the standard traditional method, which is using the official Nagios NRPE Agent.

NSClient++ does not yet support Raspbian for now. Michael Medin told me in this forum thread that he is planning to port it once he finds some spare time.

It’s also possible to install Go and Telegraf on your Raspbian, but I haven’t got the time to test that.

How to Monitor RaspBerry Pi with NRPE Agent?

The code below worked fine for me on Raspbian Jessie

wget https://github.com/NagiosEnterprises/nrpe/archive/nrpe-2-15.tar.gz -O /tmp/nrpe-2-15.tar.gz
mkdir -p /usr/local/nagios
tar -zxvf /tmp/nrpe-2-15.tar.gz -C /usr/local/nagios
mv /usr/local/nagios/nrpe-nrpe-2-15/ /usr/local/nagios/nrpe-2-15/
ln -s /usr/lib/arm-linux-gnueabihf/libssl.so /usr/lib/libssl.so
cd /usr/local/nagios/nrpe-2-15
./configure --with-ssl=/usr/bin/openssl --with-ssl-lib=/usr/lib/arm-linux-gnueabihf --enable-command-args
useradd nagios
make all
make install
make install-plugin
make install-daemon
make install-xinetd
mkdir /usr/local/nagios/etc

wget https://github.com/NagiosEnterprises/nrpe/archive/nrpe-2-15.tar.gz -O /tmp/nrpe-2-15.tar.gz

mkdir -p /usr/local/nagios

tar -zxvf /tmp/nrpe-2-15.tar.gz -C /usr/local/nagios

mv /usr/local/nagios/nrpe-nrpe-2-15/ /usr/local/nagios/nrpe-2-15/

ln -s /usr/lib/arm-linux-gnueabihf/libssl.so /usr/lib/libssl.so

cd /usr/local/nagios/nrpe-2-15

./configure --with-ssl=/usr/bin/openssl --with-ssl-lib=/usr/lib/arm-linux-gnueabihf --enable-command-args

useradd nagios

make all

make install

make install-plugin

make install-daemon

make install-xinetd

mkdir /usr/local/nagios/etc

Create nrpe.cfg in /usr/local/nagios/etc

The relevant part of my nrpe.cfg looks like this:

log_facility=daemon
pid_file=/var/run/nagios/nrpe.pid
server_port=5666
nrpe_user=nagios
nrpe_group=nagios
allowed_hosts=127.0.0.1,<ip-of-your-Nagios-server-here>
dont_blame_nrpe=1
allow_bash_command_substitution=0
debug=0
command_timeout=60
connection_timeout=300
command[check_load]=/usr/lib/nagios/plugins/check_load $ARG1$
command[check_mem]=/usr/lib/nagios/plugins/check_mem $ARG1$
command[check_procs]=/usr/lib/nagios/plugins/check_procs $ARG1$
command[check_swap]=/usr/lib/nagios/plugins/check_swap $ARG1$
command[check_users]=/usr/lib/nagios/plugins/check_users $ARG1$

log_facility=daemon

pid_file=/var/run/nagios/nrpe.pid

server_port=5666

nrpe_user=nagios

nrpe_group=nagios

allowed_hosts=127.0.0.1,<ip-of-your-Nagios-server-here>

dont_blame_nrpe=1

allow_bash_command_substitution=0

debug=0

command_timeout=60

connection_timeout=300

command[check_load]=/usr/lib/nagios/plugins/check_load $ARG1$

command[check_mem]=/usr/lib/nagios/plugins/check_mem $ARG1$

command[check_procs]=/usr/lib/nagios/plugins/check_procs $ARG1$

command[check_swap]=/usr/lib/nagios/plugins/check_swap $ARG1$

command[check_users]=/usr/lib/nagios/plugins/check_users $ARG1$

make sure to replace <ip-of-your-Nagios-server-here> with (you never guess) the ip of your Nagios server.

Let me know if you experience any issues.

Grtz

Willem