When you attempt to scheduled downtime for a host or service the downtime never appears despite being informed it was successfully added.
In addition to this when you navigate to Home > Incident Management > Scheduled Downtime there are no entries.
This problem can be caused by the Nagios XI server being unable to resolve "localhost".
Open an SSH session to your Nagios XI server and execute the following commands:
tail -f /var/log/httpd/error_log
Now go into the XI interface and attempt to schedule downtime for a host or service.
You receive output similar to the following:
[Tue Oct 11 13:49:55 2016] [error] [client 10.25.254.50] Couldn't resolve host 'localhost', referer: http://10.25.5.12/nagiosxi/includes/components/xicore/downtime.php?cmd=schedule&type=host
[Tue Oct 11 13:49:55 2016] [error] [client 10.25.254.50] Couldn't resolve host 'localhost', referer: http://10.25.5.12/nagiosxi/includes/components/xicore/downtime.php
You can see that the log file is complaining that it cannot resolve localhost.
If you execute the following command you can see the contents of the /etc/hosts file:
Here is the output:
127.0.0.1 localhost.localdomain localhost.localdomain localhost4 localhost4.localdomain4 xi-c6x-x64
::1 localhost.localdomain localhost.localdomain localhost6 localhost6.localdomain6 xi-c6x-x64
If you look at the output you can see that there are no "localhost" entries, there are similar entries but not one for "localhost".
Edit your /etc/hosts file and make sure there are localhost entries. For example:
127.0.0.1 localhost.localdomain localhost.localdomain localhost4 localhost4.localdomain4 localhost xi-c6x-x64
::1 localhost.localdomain localhost.localdomain localhost6 localhost6.localdomain6 localhost xi-c6x-x64
The last step is to restart the Apache service using one of the commands below:
RHEL 7 | CentOS 7 | Oracle Linux 7
systemctl restart httpd.service
Debian | Ubuntu 16/18
systemctl restart apache2.service
Now go and schedule downtime, your problem should be resolved.
For any support related questions please visit the Nagios Support Forums at:
Article ID: 548
Created On: Mon, Oct 10, 2016 at 11:01 PM
Last Updated On: Tue, Feb 9, 2021 at 10:36 AM
Authored by: tlea
Online URL: https://support.nagios.com/kb/article/nagios-xi-scheduled-downtime-not-working-548.html