Nagios Core Upgrade Issues

[dawsonsp]

Hi - I hope I am in the right place for some desperately need help .

We had an old version of Nagios Core (4.4.5) running on Ubuntu 18.04, we upgraded Ubuntu to 22.04 successfully and NC was working fine other than we lost our VMWare monitoring.
Then upgraded from 4.4.5 to 4.4.6 and then 4.4.10 - At this point all our hosts etc were good even nagstamon was working.
The server was rebooted and now we have no hosts or host groups showing !

How do we or can we fix this and get our hosts/groups back ?

Regards

[KilbertVangriala]

I'd be very surprised to find your distro shipping a build of nagios (or anything else) configured under /use/local/nagiod. My guess is you were using a custom build of nagios and not the official package previously. That would explain why it knew to look in /use/local/nagios by default.

[KayesPotrinak]

It sounds like the upgrade process from Nagios Core 4.4.5 to 4.4.10 may have caused some issues with your hosts and host groups disappearing after a server reboot. There are a few things you can try to fix this:

Check the Nagios Core configuration files: Make sure that the configuration files for your hosts and host groups are still present and have not been modified during the upgrade process.

Restart the Nagios Core service: Try restarting the Nagios Core service to see if this resolves the issue. You can do this by running the command "sudo service nagios restart" in the terminal.

Check Nagios Core logs: Check the Nagios Core logs for any error messages that may be related to the issue. The logs are usually located in the /var/log/nagios directory.

Rebuild your hosts and host groups: If none of the above steps work, you may need to rebuild your hosts and host groups from scratch. This can be done by manually adding them back into the Nagios Core configuration files.

It's important to take precautions before making any changes to the Nagios Core configuration files to avoid any further issues. You may want to create backups of the configuration files before attempting any fixes.