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• 05.13.09
  CPU check plugin for Nagios Binary Talks | (5)

  I've just finished version 1.0 of a CPU check plugin which is sh-compliant (as always) and calculates utilization through Jiffies rather than using another third party tool like iostat or top. This means it should work on all Linux machines right out of the box without the need to install additional software. Frankly speaking the performance of the script is slightly worse than the performance of most of the other CPU check plugins due to the sacrifice of parsing iostat or top output, but I nevertheless wanted to do this since calculating CPU utilization through Jiffies instead of parsing another tool's ...

  Tagged: cpu, gplv2, jiffies, linux, nagios, network monitoring, open source, performance, plugin, pnp template, shell scripting, sysadmin
  
• 05.11.09
  Update 1.1: UDP Packet Loss Check Plugin for Nagios Binary Talks | (0)

  I've changed the small UDP packet loss script yesterday so that it's now showing the total requests, requests sent to an unknown port and receive errors per check interval. That means, if you'd choose a check interval of 5 minutes, the script shows the amount of the previous mentioned for this time frame. It now creates two temporary files in a directory which you may define via -t/--path-tmp. The file is automatically deleted when it's size got over 32Kb. Feel free to grab it from MonitoringExchange (they've changed their name due to legal problems with Nagios Enterprises and because of Nagios' ...

  Tagged: gplv2, icinga, linux, nagios, netstat, network monitoring, open source, plugin, shell scripting, sysadmin, udp
  
• 05.05.09
  UDP Packet Loss Check Plugin for Nagios Binary Talks | (0)

  I just needed to rewrite a small check plugin I've written a few months ago to check possible UDP data loss on a host which serves an application that constantly has to process tens of thousand UDP packets at a time. Otherwise we just wouldn't know in time when the application or the host's network stack become somewhat limited because of UDP's stateless nature and that's what you better wanna know for sure if the transmitted data is valuable for the company. The script As always, the script is downloadable from NagiosExchange, via svn directly from here or the copy'n'paste way below. user@host ...

  Tagged: gplv2, linux, nagios, netstat, network monitoring, open source, plugin, shell scripting, sysadmin, udp
  
• 05.03.09
  Update 1.2: BIND Check Plugin for Nagios Binary Talks | (5)

  Update: I fixed a small, but nerving bug which is described further in this article. I also fixed the code below, means you can safely copy'n'paste it from this article as well. I just made an update to the check_bind.sh script. It (hopefully without major bugs) now supports BIND 9.3 and 9.5 or greater as well. More of this and a few other improvements within the changelog. Please note that I didn't invest much time into testing yet. It works for me under Gentoo on different hosts via BIND 9.4 and BIND 9.6 without problems and on a Debian Lenny machine with ...

  Tagged: BIND, dns, gplv2, linux, nagios, network monitoring, open source, plugin, shell scripting, sysadmin
  
• 04.27.09
  Update 1.2: Apache Check Plugin for Nagios Binary Talks | (4)

  I just made some small improvements to the check_apache2.sh script. It's now able to request the server-status page via HTTPS, if the script is called with the -S/--secure option. I didn't set a different standard port in case of -S, so you have to provide a specific port via -p/--port as well. Please be aware of the fact, that the plugin doesn't provide any logic to check the server's SSL certificate. Feel free to download it from Nagiosexchange or to svn checkout it from svn.matejunkie.com: user@host ~ $ svn co https://svn.matejunkie.com/svn/nagios-plugins/stable/check_apache/ check_apache/

  Tagged: apache webserver, gplv2, linux, nagios, network monitoring, open source, plugin, shell scripting, ssl
  
• 04.01.09
  Apache check plugin for Nagios in Python Binary Talks | (0)

  As I've already said yesterday I'm currently getting warm with Python and for the beginning I've ported my sh compliant Apache check plugin for Nagios to a Python script which is now ready for first tests in production. With options to set a hostname, a port and to define warning/critical thresholds for requests per second only, it got less features than the sh script at the moment. In future releases I'll integrate more features which are already available in the sh script, but for now that'll do the job. Feel free to visit NagiosExchange to download the script, check it out ...

  Tagged: apache webserver, gplv2, nagios, network monitoring, open source, plugin, python
  
• 03.31.09
  Porting my Nagios Plugins to Python Binary Talks | (1)

  I've just started to rewrite my sh written Nagios Plugins in Python, mainly to get a feeling for writing Python code. First steps with writing object-orientated code were... "not so good, Al!" as Weezer would have said to this. Therefore I've began with some lines of functional programming. That'll do the job for now. Below you'll see a rudimentary plugin to check the Apache's server-status page. Note that it will never go critical at this time. I was just playing around with retrieving a file, putting the content into a dictionary and then transforming it to a proper output which Nagios ...

  Tagged: apache webserver, dictionary, draft, nagios, network monitoring, optionparser, plugin, python, urllib
  
• 03.20.09
  Update 1.1: Apache check plugin for Nagios Binary Talks | (1)

  Update: After reading this article, consider reading the update to version 1.2 as well. I've just made an update to the check_apache2.sh script which I've released several days ago. It now supports completely optional warning/critical thresholds to monitor requests per second more accurate. Changelog Options -wr an -cr to set warning/critical thresholds for request per seconds Slightly altered the perfdata output so that uptime now only shows up when the -ext-info/-e option is being used Perfdata output without --ext-info/-e now only shows requests per second, cpu load, idle and busy workers I didn't remove the total request/uptime perfdata yet since I'm still thinking about using them ...

  Tagged: apache webserver, gplv2, linux, nagios, network monitoring, opensource, plugin, shell scripting
  
• 03.19.09
  Bind check plugin for Nagios Binary Talks | (7)

  Update: After reading this article, consider reading the update to version 1.2 as well. check_bind.sh is another Nagios Plugin I've written. It's purpose is to check whether the daemon is running and to trigger rndc stats to get BIND's performance data. First the bad news: It does only support BIND 9.4 or probably lower at the moment since the rndc stats output has been heavily changed in version 9.5. I've planned to release the script also with support for 9.5 in the first place, but then decided to update the script afterwards because of the time it'll take to do the ...

  Tagged: BIND, dns, gplv2, linux, nagios, network monitoring, open source, plugin, shell scripting
  
• 03.15.09
  Apache check plugin for Nagios Binary Talks | (3)

  Update: After reading this article I strongly suggest to use the updated version 1.1 of this script described in this article. Apache is the most widely spread webserver on earth with a market share of over 50% according to Netcraft's webserver survey for February 2009. Sad to say that almost every Apache related Nagios check has some disadvantages. At least the one's I know of. Therefore I just started to work on a Nagios plugin that check's the Apache's health. Plugin overview checks whether the Apache is running wgets the server's server-status page and checks the following data: Requests per second CPU utilization Uptime since last restart Amount ...

  Tagged: apache webserver, gplv2, linux, nagios, network monitoring, open source, plugin, shell scripting
  

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