It had been awhile since I have installed NRPE or Nagios Remote Plugin Executor running through xinetd so once I thought I had everything configured I attempted to restart xinetd but NRPE was not working properly. Below I describe the error in more detail along with how I resolved the issue. In the below example the…
Earlier in the week when moving Nagios from one server to another I ran into a bunch of random issues with Monarch which is the Nagios configuration file manager I use. After I got everything installed and thought that I was past any errors I ran a Pre Flight Test on the Nagios configuration files…
The error detailed below is from the Apache error logs. The error displayed in the Apache error log after the first attempt to visit monarch.cgi for the first time. I had already installed the JavaScript::DataFormValidator Perl module but after initially installing the JavaScript::DataFormValidator Perl module I also installed Perl 5.10 in a different location than the…
The below is part of the output when receiving an error attempting to install the Perl DBD::mysql module using the CPAN shell. I rarely use the Perl CPAN shell since most of the packages are available on CentOS, my typical Linux distribution choice for servers, using the yum package manager. In this case I was…
I recently moved Nagios monitoring from one server to another and ran into a couple minor issues. I wanted to point out some of the errors and the steps I took to resolve those errors on a CentOS Linux server. The biggest pain about moving Nagios for me was the fact that I use Monarch…
In the process of installing Monarch, which is a Nagios file manager, earlier I ran into a couple errors for modules I thought I had already installed. Then I realized the issue must be because during the process of installing modules Perl wanted to upgrade from 5.8 to 5.10 on CentOS. I went ahead and…
We have various scripts on a server that process files that are uploaded to a specific directory so we needed a way to monitor these directories and verify that all files are being processed. Once they are processed on our server they are moved to different directory so the file count should never get over…
Nagios is an awesome open source application that provides a way to monitor pretty much anything that you can think of on your network. There are tons of plugins written for Nagios that will monitor anything from PostgreSQL database size to the number of users logged into a server. Today I needed to start monitoring…
When attempting to stop or restart Nagios on CentOS I was receiving the below error. This has been an issue for me for quite some time however I was to lazy to even put a patch in place and always just would kill the Nagios processes by hand. Tonight I was modifying some Nagios configuration…
I recently decided to do a fresh CentOS install on a web server with a minimal amount of sites on it because it seemed easier than attempting to upgrade everything. With a fresh install I figured I would be forced to get everything completed quicker. The server was upgraded from CentOS 5.1 to CentOS 5.3…