Nagios Support Forum

Hi,

I have the following problem, i have 711 host in my nagios core (version 4.3.4) but, some hosts appear and disappaear without action of my part.

result of /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg:

Checking objects...
Checked 2749 services.
Checked 711 hosts.
Checked 0 host groups.
Checked 0 service groups.
Checked 13 contacts.
Checked 10 contact groups.
Checked 76 commands.
Checked 5 time periods.
Checked 0 host escalations.
Checked 0 service escalations.
Checking for circular paths...
Checked 711 hosts
Checked 0 service dependencies
Checked 0 host dependencies
Checked 5 timeperiods

OK State:

Host Status Totals
Up Down Unreachable Pending
704 7 0 0
All Problems All Types
7 711
Fail State

Host Status Totals
Up Down Unreachable Pending
662 4 0 0
All Problems All Types
4 666
When i refresh the page the host appear automatically. Please, your support.

Can you post the nagios.cfg file from the server so we can check the main configuration file settings?
Also, can you post the first 100 lines of the status.dat file?

One thing to check, is the time settings for the Nagios server stable?
If it is drifting, it could cause the issue you are having.

You may also want to upgrade to the latest version of Core on your server.

Hi tgriep,

Attached as requested

One thing I see is that the Host Freshness option is not enabled on your server.

# This option determines whether or not Nagios will periodically
# check the "freshness" of host results. Enabling this option
# is useful for ensuring passive checks are received in a timely
# manner.
# Values: 1 = enabled freshness checking, 0 = disable freshness checking

Edit the nagios.cfg file and set the option to 1 which will update the Host checks (Active and Passive) in a more timely manner. Restart nagios and see if that updates the Host Status better.

thanks for the answer tgriep,

I have noticed that the refreshment is faster, but some host still appear and disappear. as a data I tell you that now I have 725 host and at times I still see only 666, even having increased the total number of hosts (725) always decreases to the same value (666)

It could be just a browser and the web server timing issue but always going to 666 is weird.
I suggest upgrading to the latest version of Core and you can download that at this link.
https://assets.nagios.com/downloads/nag ... 4.2.tar.gz

Hi,

before making the upgrade, I have another additional verification?

One more thing to try, edit the /usr/local/nagios/etc/cgi.cfg file and change the following option. That option changes the refreshing of the other cgi scripts and the data in the GUI. That may work as well.
Remember to restart the Apache and Nagios processes after changing that setting.

Hi,

change the refresh_rate=10 parameter but I still have the same problem, the only option I have is to update?

Your issue could be caused by multiple Nagios processes running at the same time. Please run the following commands in order:

service nagios stop
killall -9 nagios
service nagios start

Let me know if this fixes your issue. Also, when did you start noticing this problem? What changes were made to the system prior to that?