Nagios2 to Nagios4

Hello experts,

I created a VM to try out Nagios4 (Should I keep it as a VM?)

I am in the process of changing to something better than Nagios2 for our company.

I have Nagios4 installed and ready to be configure and I was wondering if by copy and pasting the config files from Nagios2 I could get up and running.

Do I also need to reconfigure the plugins devices I am going to monitor?

Thank you!
marceloNYCMiddle-Tier AdministratorAsked:
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btanExec ConsultantCommented:
if you have stepped through the upgrade through to v4, the config will not need to be migrated as the existing configuration files will not be overwritten. Verify your configuration files. Correct any errors shown here before proceeding with the step e.g. /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

But do also find the latest release of Nagios Plugins here: Nagios Plugins Download. Copy the link address for the latest version, and copy the link address so you can download it to your Nagios server.

However, there is some discrepancies in v2 fields compared to latest v3 onwards. See below as you may need to change your configuration files a bit
https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/3/en/upgrading.html

Always good to check out v4 capabilities as it is best not to do major changes like swapping into new solution  w/o assessing the real "gap" faced when deploying and using Nagios e.g. false positive or unreliable reporting and performance etc...v4 does improve like
The performance enhancements provided by the new worker process architecture make up for any performance loss due to the removal of embeddd Perl. In addition, the worker process architecture makes possible the implementation of a special purpose worker to persistently load and run Perl plugins.
https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/whatsnew.html

Can spend some time to identify really the services critical to you, and start monitoring those again. Review the notifications so far setup , and if they can even fulfill reliably and faster email to alert when your disk utilization hits a warning or critical threshold or if monitoring your outage of main website and rate of response to those (expected) situation earlier or before a problem even occurs.

But if really looking at "new" candidate probably Icinga being compatible may be considered
Icinga is unique as a monitoring system and an ambitious project. This can be seen in the major differences to Nagios in Icinga’s architecture, two web interfaces and reporting capabilities, features for easier add-on development, as well as its open and transparent development style.
https://www.icinga.org/resources/faq/icinga-vs-nagios/
...and do see side by side comparison https://wiki.icinga.org/display/Dev/Bug+and+Feature+Comparison
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marceloNYCMiddle-Tier AdministratorAuthor Commented:
Excellent!

The primer I needed to get me going.

Thank you so very much sir.
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