Nagios Support Forum

Hi,

we are having trouble with some of our centos servers not showing perf graphs. all windows and most other linux systems are fine.

performance data is being shown in nagios, just no graphs. it is on all services

see attached screenshots and profile.

thank you.

Hello, @blariv. The problem with passive checks and RRD is that if passive results don't come soon enough, the RRD tool will ignore them. The default heartbeat is 8640 seconds, meaning the data isn't inserted if there is an interval greater than 2.4 hours between points. You can verify the heartbeat settings on the databases by running:

rdtool dump /usr/local/nagios/share/perfdata/<hostname>/<servicedesc>.rrd | grep -i heart

<minimal_heartbeat>8460</minimal_heartbeat>

@ blariv, How often does this service check get updated with the passive result? Is the interval larger than 2 hours or smaller?

just wanted to provide an update. its seems that when sending the passive check directly from the server we are seeing this error, therefore nothing is actually getting back to the XI server.

ERROR: The NRDP Server said
Use of uninitialized value $status in string eq at /usr/local/nrdp/clients/nrds/nrds_updater.pl line 161, <CONFIG
ERROR: Could not connect to http://nagiosxi.xxx.com/nrdp/. Check your cfg file. at /usr/local/nrdp/clients/nrdp

@blariv, Please post all files from the following folder:
/usr/local/nrdp/clients/nrds

Also, from the client-server, please run the nmap command against the Nagios XI server and post the result.

I seem to have fixed most of it.

looks like my nrds config on the hosts we pointing to http instead of https.

However of the 4 checks we use 3 are writing perf data.

command[Check Load]=/usr/local/nagios/libexec/check_load -w 30,25,20 -c 50,40,35
command[Check Disk]=/usr/local/nagios/libexec/check_disk -w 10% -c 5% -X nfs -X cifs
command[Check Swap]=/usr/local/nagios/libexec/check_swap -w 20% -c 10%
command[Check Zombie Procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z

Check Disk is not.

I grabbed the info from this command.
rrdtool dump /usr/local/nagios/share/perfdata/hostname.xxx.com/Check_Disk.rrd

This shows nothing written since 2018-03-15 14:00:00 EDT the rest are showing 2019-04-10 08:00:00

I noticed this in the /usr/local/nagios/share/perfdata/<hostname>/<servicedesc>.rrd file for this host

<RRD>
<RC>1</RC>
<TXT>/usr/local/nagios/share/perfdata/hostname.xxx.com/Check_Disk.rrd: found extra data on update argument: 0:125</TXT>
</RRD>

@blariv, Can you move the Check_Disk.rrd and Check_Disk.xml files to a backup location and then remove them from this folder:

/usr/local/nagios/share/perfdata/

After that wait 15 minutes and check again to see if the graph started working.

that did it.

is there an easy way to find that string in any .xml file so i can just recreate those?