After several years of using Nagios with its old interface, I realized that there should be something out there that it can simplify the configuration. Moreover, I tested a lot of configurations tools for Nagios but none was quite as good as I expected. Finally, I decided to test other monitor tools like Zenoss, Zabbix, Hyperic, Opsview, and Groundworks.
Zenoss : Enterprise ready, Opensource/Commercial, Nice GUI, and support nrpe.
Zabbix : Enterprise ready, Opensource/Commercial, Nice GUI, and uses its own agent.
Hyperic: Enterprise ready, Opensource/Commercial, Nice GUI, and uses its own agent.
Opsview: No Enterprise ready, Opensource, Clean GUI, and Nagios based.
Groundworks: Enterprise ready, Opensource/Commercial, Nice GUI, and Nagios based.
All are wonderful tools, easy to install, and provide the service that you need. However, Nagios has been around for the longest time and people is very familiar with it , so I decided to be focused on Opsview and Groundworks. Well ...as always , you must be covered by some kind of support ...so I suggest you to go Groundworks......
It is very easy to install ....
First , get a clean installation of linux ....I recommend Centos...(This is another discussion)
Second, download the binary file from http://www.groundworkopensource.com/community/downloads/6.0-download.html
Third, execute the file and follow the instruction.
Finally, you can configure it through the web interface. You can use Autodiscovery, add your own commands and so on....