Prerequisites

• RRDtool is the OpenSource industry standard, high performance data logging and graphing system for time series data. Use it to write your custom monitoring shell scripts or create whole applications using its Perl, Python, Ruby, TCL or PHP bindings.
  Our CentOS server needed a few devel libraries installed for RRDtool:
  yum -y install cairo-devel glib2-devel pango-devel

  Download the latest source for RRDtool

  cd /extra/src
wget http://oss.oetiker.ch/rrdtool/pub/rrdtool-1.4.3.tar.gz
tar zxf rrdtool-1.4.3.tar.gz
cd rrdtool-1.4.3

  Configure it with a few adjustments for our setup:

  ./configure --prefix=/usr/local/rrdtool

  If everything is ok, then build and install it

  make
make install
• Zlib support for PHP - --with-zlib

Installation
Download the latest version of PNP4Nagios:

Configure it:

Then build and install:

Copy the sample config files:

Add pnp4nagios to your Apache configuration:

• Install the Apache config file into /usr/local/apache2/conf/extra/pnp4nagios.conf:
  
  make install-webconf

  Then edit /usr/local/apache2/conf/httpd.conf and add a line to load the PNP4Nagios conf file:

  Include conf/extra/pnp4nagios.conf
• orcan add the contents of src/httpd.conf to your Nagios VirtualHost directive:
  
  Alias /pnp4nagios "/usr/local/pnp4nagios/share"

  <Directory "/usr/local/pnp4nagios/share">
  AllowOverride None
  Order allow,deny
  Allow from all
  #
  # Use the same value as defined in nagios.conf
  #
  AuthName "Nagios Access"
  AuthType Basic
  AuthUserFile /usr/local/nagios/etc/htpasswd.users
  Require valid-user
  <IfModule mod_rewrite.c>
    # Turn on URL rewriting
    RewriteEngine On
    Options FollowSymLinks
    # Installation directory
    RewriteBase /pnp4nagios/
    # Protect application and system files from being viewed
    RewriteRule ^(application|modules|system) - [F,L]
    # Allow any files or directories that exist to be displayed directly
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    # Rewrite all other URLs to index.php/URL
    RewriteRule .* index.php/$0 [PT,L]
  </IfModule>
</Directory>

Access the PNP4Nagios Environment Tests by going to http:///pnp4nagios. If it passes all the tests, remove the install.php file:

NPCD Daemon
We're going to use daemontools. If you haven't already, install daemontools.
Copy the sample NPCD config file:

Create a directory for the NRPE service:

Create the run script and make it executable:

Our log script comes from John Simpson's:

Finally, add the service to daemontools by creating the symbolic link in /service

Confirm that the service is running:

Data Collection
Nagios needs to be configured to trigger the data collector by editing /usr/local/nagios/etc/nagios.cfg and editing/uncommenting some lines:

Edit /usr/local/nagios/etc/objects/commands.cfg and remove the existing process-service-perfdata and process-host-perfdata commands. Then add the new PNP4Nagios commands for service and host performance data logging:

Nagios Web Front-End Integration
In order to easily view the graphs from your Nagios server, we can take advantage of Nagios' external URL features in extended info configs. There are two ways of doing it - regular links or Javascript pop-ups:

• Regular Links
  Edit /usr/local/nagios/etc/objects/templates.cfg and add:
  # PNP4Nagios host/service definitions
  define host {
     name       host-pnp
     action_url /pnp4nagios/graph?host=$HOSTNAME$&srv=_HOST_
     register   0
  }

  define service {
   name       srv-pnp
   action_url /pnp4nagios/graph?host=$HOSTNAME$&srv=$SERVICEDESC$
   register   0
}

• Javascript pop-ups
  Copy status-header.ssi to your Nagios web files:
  cp /extra/src/pnp4nagios-0.6.3/contrib/ssi/status-header.ssi \
/usr/local/nagios/share/ssi/

  Edit /usr/local/nagios/etc/objects/templates.cfg and add:

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

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

To use them, add them to your host/service definitions with something similiar to: