Sunday, 4 September 2016

Install PNP4Nagios for Nagios Core on CentOS 7

Install PNP4Nagios on Nagios Core over CentOS 7

In search of a graph add-on for Nagios, we have already explored the Nagiosgraph, although it works fine. But we kept looking for other alternates to Nagiosgraph. This is how PNP4Nagios pulls our attention towards it. PNP4Nagios is an add-on to Nagios which analyzes performance data provided by plugins and stores them automatically into RRD-databases (Round Robin Databases).

PNP4Nagios can be configured in different ways like SYNC, BULK, BULK+NPCD, etc. Although the SYNC mode is claimed to has the most straight forward configurations, but unfortunately it didn’t work for me due to some bug (related to Environment Variables) in Nagios 4.x. Therefore, I switched to BULK+NPCD mode.

In this article, we will install PNP4Nagios plugin on our Nagios Core Server over CentOS 7.

Before moving forward, it is required to have basic concepts of Nagios Core 4. Therefore, it is highly recommended that you should have Learning Nagios - Third Edition. It will be really helpful for you during your Nagios journey.

Install PNP4Nagios on Nagios Core over CentOS 7

System Specification:

We have configured a CentOS 7 virtual machine with Nagios Core 4.4 Server having following specifications.

  • CPU - 2.4 Ghz (1 Core)
  • Memory - 1 GB
  • Storage - 20 GB
  • Swap - 2 GB
  • Operating System - CentOS 7.6
  • Nagios Version - Nagios Core 4.4
  • IP Address -


Install PNP4Nagios on Nagios Core over CentOS 7:

Install prerequisites packages using yum.

# yum install rrdtool rrdtool-perl perl-Time-HiRes perl-GD -y

Download the latest tarball of PNP4Nagios from http://www.pnp4nagios.org/.

Go to the directory in which you have downloaded the PNP4Nagios tarball, and extract it.

# cd /soft/nagios
# tar xvf pnp4nagios-0.6.25.tar.gz

Go the directory, where PNP4Nagios is extracted, and install it.

# cd pnp4nagios-0.6.25
# ./configure
# make all
# make fullinstall

Edit nagios.cfg and comment (#) all performance parameters.

# vi /usr/local/nagios/etc/nagios.cfg

Add following parameters in nagios.cfg.

# service performance data

# host performance data

Now edit commands.cfg.

# vi /usr/local/nagios/etc/objects/commands.cfg

Add following commands in commands.cfg.

define command{
       command_name    process-service-perfdata-file
       command_line    /bin/mv /usr/local/pnp4nagios/var/service-perfdata /usr/local/pnp4nagios/var/spool/service-perfdata.$TIMET$

define command{
       command_name    process-host-perfdata-file
       command_line    /bin/mv /usr/local/pnp4nagios/var/host-perfdata /usr/local/pnp4nagios/var/spool/host-perfdata.$TIMET$

Start and enable npcd service.

# /usr/local/pnp4nagios/bin/npcd -d -f /usr/local/pnp4nagios/etc/npcd.cfg
# systemctl enable npcd.service

Restart nagios and httpd services.

# systemctl restart nagios.service
# systemctl restart httpd.service

Open the URL in a client's browser to check configurations, and if there is a failed check then rectify it. (Change the IP address to your CentOS 7 server’s IP address here.)


It didn’t show me any failure.

Now remove the file /usr/local/pnp4nagios/share/install.php

# rm -f /usr/local/pnp4nagios/share/install.php

Again, open the URL in a client's browser and this time you will see the graphs.


We have successfully installed PNP4Nagios plugin on our Nagios Core Server over CentOS 7.

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  1. Sound Achievement. Its really good.

  2. Thank you, working with new 4.2.1 too.

  3. Hello , thanks for the tuto it work smoothly,
    There is a missing thing, that after installing pnp4nagios and it gave me all the wanted graphs, i can't export it as PDF and notice said that "php gd functions are missing", in my case I fixed it with installing php-gd wih the commande "yum install php-gd"
    maybe you can invoke it in the prerequisites packages.

  4. Nice blog with excellent information. Thank you, keep sharing. Kubernetes Training in Hyderabad

  5. how can i do it in debian ???

    1. Hi,

      I haven't work on this scenario yet. On your request, I am adding it to the pipeline. Hopefully, you may find the required article on this Blog very soon.

  6. Hi Ahmer ,

    Thanks for this instruction to install the pnp4nagios , once i insalled a follow the instruction the web shows only the hostpref no servicepref note i installed the nagiosgraph before

    is that the reason and how to override it ?

    1. Hi,

      Please check

      1)service_perfdata related parameters in nagios.cfg file
      2)process-service-perfdata-file command in commands.cfg file

  7. i try to install pnp4nagios on my rhel 6 when i run on my browser http://nagiosserver ip/pnp4nagios it's asking me username and password i want to authenticate with nagiosadmin account please help

    1. PNP4Nagios is a plugin for Nagios. Nagios didn't have any native authentication method. Therefore, we set HTTP basic authentication to control user access.

      Remove the HTTP basic authentication and it won't ask you for any user/password.


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