When trying to get the custom time range for PNP4Nagios graphs, it might result in an error "application/models/data.php [664]:". It can easily resolved by editing "system.php"  in PNP4Nagios controllers folder. To start with first make a backup of the file.

# cp -a /usr/local/pnp4nagios/share/application/controllers/system.php /usr/local/pnp4nagios/share/application/controllers/system.php.bkp
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Its now possible to install the latest version of Nagios NRPE v 3.0.1 (source install) on RaspberryPi (incl. Pixel OS). Just follow this simple article and you will be up and running with NRPE on Nagios clients as well as on the Nagios server which needs to communicate to clients via nrpe agent. This guide is valid for Raspbian Jessie and the latest version that is Raspbian Pixel OS.

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The process of replacing the default SSL certificates on ESXi 6.x/6.5 is a simple process involving around 5-10 steps. We would need a seperate linux host to generate the openssl self-signed certificate (NOTE: we are not using any CA). Host needs to be in Host Maintenance mode during the process. Please plan downtime.

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This article shows you how to Automate iptables for the whole infrastructure (linux/unix) and maintain the state during the lifecycle of a host. We would need to install 2 modules from PuppetLabs so that we can assign Rules based on the requirements, whether its from one destination to another or from one host to multiple destinations or vice-versa.

  1. puppetlabs/Firewall = Standard module for iptables.
  2. puppetlabs/Firewall_multi = Module that takes care off when adding multiple source/destination/ports in one Rule.
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