Icinga Monitoring System

After many installations of Icinga, I finally decided to cobble together the documentation that I use and add it to a central location. Links to the original documents are found throughout this post. This document provides instructions on setting up the Icinga monitoring system. It will go over the following:

  • Icinga and IDOUtils
  • Icinga Web
  • PNP4Nagios
  • Icinga Mobile


  • Ubuntu Server 14.04 LTS 64 Bit
  • 2GB RAM
  • 2 CPU
  • 60 GB HDD

Icinga and IDOUtils

The installation of the following software will be covered in this section:

  • Icinga Core
  • Icinga Classic UI (the “CGIs”)
  • Icinga IDOUtils
    • Mysql or Postgresql as database
  • Icinga Docs

Icinga Core

This document describes the procedure for installing Icinga core using the official packages. There is also documentation for installing the package maintainer version (PPA) which may be more up to date.

The following command will install all required packages:

sudo apt-get install icinga icinga-doc icinga-idoutils mysql-server libdbd-mysql mysql-client

This installation will use MySQL as the database server. Postgress can also be used, but will not be covered in this document.


The following command will install the Nagios plugins.

sudo apt-get install nagios-plugins


Enable IDO2DB

Edit the following file:


change the following line:




Then restart the ido2db service:

sudo service ido2db start

check to see if it is enabled on startup:

sh -x /etc/init.d/ido2db start | grep IDO2DB




Copy the example configuration file into the Icinga configuration directory:

sudo cp /usr/share/doc/icinga-idoutils/examples/idoutils.cfg-sample /etc/icinga/modules/idoutils.cfg

Restart Icinga with:

sudo service icinga restart

Check the logfile (/var/log/icinga/icinga.log) to see if the module has been loaded and connected to IDO2DB:

[1399482608] idomod: IDOMOD 1.10.3 (02-11-2014) Copyright(c) 2005-2008 Ethan Galstad, Copyright(c) 2009-2013 Icinga Development Team (https://www.icinga.org)
[1399482608] idomod: Successfully connected to data sink. 0 queued items to flush.
[1399482608] Event broker module 'IDOMOD' version '1.10.3' from '/usr/lib/icinga/idomod.so' initialized successfully.

Enable External Commands

This may have been enabled during the package installation. To check, do the following:

See if:


exists in /etc/icinga/icinga.cfg

If it is set to 0, change it to 1 as above and do the following:

sudo service icinga stop
sudo dpkg-statoverride --update --add nagios www-data 2710 /var/lib/icinga/rw
sudo dpkg-statoverride --update --add nagios nagios 751 /var/lib/icinga
sudo service icinga start

Classic UI Authentication

Users can be added to access the portal with the following command:

sudo htpasswd /etc/icinga/htpasswd.users <username>


PNP is an addon for the Nagios Network Monitoring System. PNP provides easy to use, easy to configure RRDTools based performance charts feeded by the performance data output of the Nagios Plugins.” – http://docs.pnp4nagios.org/pnp-0.6/start

This document covers installing PNP for Icinga.


  • Icinga running
  • Icinga Classic UI or Icinga Web running


First, ensure the system is up to date with:

sudo apt-get update

Then install the pnp4nagios package:

sudo apt-get install --no-install-recommends pnp4nagios

without –no-install-recommends, icinga will be installed as a dependancy if not already installed. Icinga installation was covered in the previous section.

Enable RRDCached in PNP4Nagios

“rrdcached is a daemon that receives updates to existing RRD files, accumulates them and, if enough have been received or a defined time has passed, writes the updates to the RRD file. A flush command may be used to force writing of values to disk, so that graphing facilities and similar can work with up-to-date data.” – http://oss.oetiker.ch/rrdtool/doc/rrdcached.en.html

General purpose – decrease I/O, increase performance.


Install the software with the following command:

sudo apt-get install rrdcached

Now, add it to system init:

sudo update-rc.d rrdcached defaults

RRDCACHED Configuration

Create the cache directory:

sudo mkdir -p /var/cache/rrdcached

Add the nagios user to the www-data group with:

sudo usermod -aG www-data nagios

Now the nagios user account can write to web directories.

Edit the configuration file, /etc/default/rrcached and add the following line:

OPTS="-w 1800 -z 1800 -j /var/cache/rrdcached -s nagios -m 0660 -l unix:/var/run/rrdcached.sock"

Now, restart the service:

sudo service rrdcached restart

PNP4Nagios Configuration for RRDCACHED

Add the following line to /etc/pnp4nagios/process_perfdata.cfg

RRD_DAEMON_OPTS = unix:/var/run/rrdcached.sock

Then modify the following line in /etc/pnp4nagios/config.php

$conf['RRD_DAEMON_OPTS'] = 'unix:/var/run/rrdcached.sock';

Also, change the nagios_base  in config.php to the following:

$conf[‘nagios_base’] = “/cgi-bin/icinga”;

Restart Services

sudo service rrdcached restart


sudo service apache2 restart

Enable PNP4Nagios in Icinga


Add performance data in icinga.cfg. Edit /etc/icinga/icinga.cfg and add the following lines:

# performance data







Add commands to /etc/icinga/commands.cfg:

# pnp4nagios
define command{
        command_name    pnp-bulknpcd-service
        command_line    /bin/mv /var/spool/pnp4nagios/nagios/service-perfdata /var/spool/pnp4nagios/npcd/service-perfdata.$TIMET$

define command{
        command_name    pnp-bulknpcd-host
        command_line    /bin/mv /var/spool/pnp4nagios/nagios/host-perfdata /var/spool/pnp4nagios/npcd/host-perfdata.$TIMET$

Web Configuration

Edit the /etc/apache2/conf-available/pnp4nagios.conf file and change to the following:

        AuthName "Icinga Access"
        AuthType Basic
        AuthUserFile /etc/icinga/htpasswd.users

Then restart apache with service apache2 reload.

Enable NPCD

Edit /etc/default/npcd and edit the fllowin gline to look like:


Then restart the service with:

sudo service npcd start

Integration Into Icinga

Create the file /etc/icinga/objects/pnptemplates.cfg

define host {
        name       pnp-hst
        register   0
        action_url /pnp4nagios/graph?host=$HOSTNAME$' class='tips' rel='/pnp4nagios/popup?host=$HOSTNAME$&srv=_HOST_

define service {
        name       pnp-svc
        register   0
        action_url /pnp4nagios/graph?host=$HOSTNAME$&srv=$SERVICEDESC$' class='tips' rel='/pnp4nagios/popup?host=$HOSTNAME$&srv=$SERVICEDESC$

Then use them in host and service configurations:

define host{
        name                            generic-host
        use                             pnp-hst

define service{
        name                            generic-service
        use                             pnp-svc

Copy the ssi file to the web UI:

sudo cp /usr/share/doc/pnp4nagios/examples/ssi/status-header.ssi /usr/share/icinga/htdocs/ssi/status-header.ssi
sudo chmod 644 /usr/share/icinga/htdocs/ssi/status-header.ssi

then reload icinga for the changes to take effect:

sudo service icinga reload

WMI and JMX with Icinga

Over the past week I have been flexing my monitoring skills again. Of course the landscape has changed since I worked on this a few years ago. Today, I am struggling with a commercial product, unnamed. Bloated, expensive, horrible GUI, and time consuming. I am sure it is a good product given that you have an entire staff dedicated to managing it.

So, I went back to my roots and set up an Icinga instance. I have it fully working on a Linux box monitoring Windows hosts. Agentless. No more nsclient installs. I am using check_wmi_plus plugin for everything Windows. You can supply a wmi query string to the plugin for anything WMI. Here are some URLs:


some service definitions:


I am also monitoring out Java infrastructure. You need to make sure the java app is set up for remote jmx monitoring before this will work.


and some nice service defs and commands:


Maybe I will get some time to write up a comprehensive faq.