Nagios Support Forum

When attempting to remove a host from nagios monitoring, I get this message:

Host Deletion Error


Could not find a unique id for this host
Host cannot be deleted using this method
One or more errors were detected that prevent the host from being deleted.

Possible causes include...

The host is associated with other hosts, services, or objects that need to be deleted first
The host is maintained in a static or external configuration file
To resolve this issue...

Use the Nagios Core Configuration Manager to delete the host - or -
Manually delete the host definition from the appropriate external configuration file

However, when I look at the configuration manager. That server is not listed there. Where is configuration file located and what is the best way to edit that file?

Hi @Kxfrancois,

Let's make sure you do not have multiple Nagios processes running. Run the following commands on the server: Then go to the Configure > CCM > Tools > Config File Management, and click on Write and Verify to check for config errors.

If you don't have any errors, click on Delete to remove all host and service configuration files.
Next, apply configuration. The configs will be recreated with whatever is in the database.

Let me know this resolves the issue. If you're getting any error messages on Verify, please post the error messages or upload a screenshot.

Nagios XI - Host Still Visible After Deletion (Ghost Hosts)
https://support.nagios.com/kb/article.php?id=27

I get this message when I click on verify files:

Error: Service has no hosts and/or service_description (config file '/usr/local/nagios/etc/services/COMMON-SERVER-SERVICE.cfg', starting on line 48)

Nagios Core 4.4.2
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 2018-08-16
License: GPL

Website: https://www.nagios.org
Reading configuration data...
Read main config file okay...
Error: Service has no hosts and/or service_description (config file '/usr/local/nagios/etc/services/COMMON-SERVER-SERVICE.cfg', starting on line 48)
Error processing object config files!


***> One or more problems was encountered while processing the config files...

Check your configuration file(s) to ensure that they contain valid
directives and data definitions. If you are upgrading from a previous
version of Nagios, you should be aware that some variables/definitions
may have been removed or modified in this version. Make sure to read
the HTML documentation regarding the config files, as well as the
'Whats New' section to find out what has changed.

Hi @Kxfrancois

Before making any other changes, I would recommend making a backup of your system or taking a VM snapshot.
https://assets.nagios.com/downloads/nag ... ios-XI.pdf

Make sure there is nothing in the import directory: Open the file /usr/local/nagios/etc/services/COMMON-SERVER-SERVICE.cfg', and take a look a the service definition on line 48 for the errors described. Go to the CCM > Monitoring > Services and delete or correct this service, then go to to Configure > CCM > Tools > Config File Management, and click on Write and Verify to check for config errors. Repeat this process if necessary.

If you don't have any errors, click on Delete to remove all host and service configuration files. Next, apply configuration. The configs will be recreated with whatever is in the database.

If your not able to get it resolved, please PM me your system profile:
Login to the Nagios XI GUI using a web browser.
Click the "Admin" > "System Profile" Menu
Click the "Download Profile" button
Save the profile.zip file and upload it to a cloud storage of your choice. You can share a link with me in a personal message.
After you upload the profile please post something in this thread to bring it up in the support queue.

That Worked! Thank you so much for your help!

Hi @Kxfrancois,

That Worked! Thank you so much for your help!

Great, and thanks for letting us know. Did you have any other questions or is it OK to close this post?

You can close this ticket.