I have observed the same situation. There is a race condition if you are
caching metrics and the way Nagios/Icinga schedules checks where you may
end up with an empty cache. Way to resolve this is to either
1. Turn off cache - you will need to increase number of gmetad threads
2. Warm up the cache e.g.
https://github.com/ganglia/ganglia-web/tree/master/nagios
contains a warm up script you can run every e.g. 10 seconds that populates
the cache.
Vladimir
On Mon, 21 May 2012, Alexander Karner wrote:
Hi!
I'm actually facing an interesting behaviour of the nagios scripts in the
Ganglia web UI:
(Using the latest available versions of Ganglia and Ganglia Web on AIX)
1) Sometimes a critical state is returned - allthough the last beacon was
received within the threshold:
$ ./check_heartbeat host=host1 threshold=50
CRITICAL Last beacon received 0 days, 0:00:11
--> Running this command from the command line repeatedly may or may not return
this kind of information or an OK statement. It does
not matter if the last beacon was received within the last 1, 3, 15 or
"whatever" seconds.
2) I also installed Icinga to monitor the health of the Ganglia daemons.
In the service details I see up to now for each single host either the OK statement
- or I get a "UNKNOWN Hostname info not
available. Likely invalid hostname"
This message ususally disappears after some or several additionally attempts to
get the data but may come back later.
If I try to verify the state from the comand line I receive in most cases the
"OK" statement and in a few cases the above shown
"CRITICAL" value.
Does anyone know how to bring this in a more consistent state?
Mit freundlichen Grüßen / Kind regards
Alexander Karner
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