Certain Ports are not showing graphs


LibreNMS is not displaying graphs for certain ports namely sensor information. I have been trying to understand why this happens however I have not been successful.

On the Web UI’s Health/dBm tab, I have numerous sensors that are marked with a red flag, but it not obvious to me why they are not being graphed.

Is there a procedure I can follow, or logs I can read to debug this?

Thank you.


Firstly please post the out put of validate.php

Here it is:


Component Version
LibreNMS 1.48.1-27-gc7c1ca2
DB Schema 2019_01_16_195644_add_vrf_id_and_bgpLocalAs (131)
PHP 7.2.14
MySQL 10.3.12-MariaDB
RRDTool 1.4.8


[OK] Composer Version: 1.8.3
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[FAIL] Some folders have incorrect file permissions, this may cause issues.
sudo chown -R librenms:librenms /opt/librenms
sudo setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
sudo chmod -R ug=rwX /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/

You need to run those fixes

I already did, and I already had a few times in the past.

Still many ports do not show any graphs.


Run ./poller.php -d -h affectedhost -m sensors and check/pbin the output.

You can use http://p.libren.ms

Here it is,


I believe I pasted it twice (first time using this).


We are trying to help you I’m not sure what’s with all I have already comments.

I’m sorry I don’t understand what you mean by this

Please disregard the first paste, this is the correct one:


Click into the graph with issues and click the “show command” link.

Here it is:

RRDTool Command

rrdtool graph /tmp/sK9pWy891MwhaqQg -l 0 -E --start 1549550400 --end 1549636800 --width 1929.6 --height 539.5 -c BACK#EEEEEE00 -c SHADEA#EEEEEE00 -c SHADEB#EEEEEE00 -c FONT#000000 -c CANVAS#FFFFFF00 -c GRID#a5a5a5 -c MGRID#FF9999 -c FRAME#5e5e5e -c ARROW#5e5e5e -R normal --font LEGEND:8:DejaVuSansMono --font AXIS:7:DejaVuSansMono --font-render-mode normal COMMENT:’ Min Last Max\n’ DEF:sensor=/opt/librenms/rrd/hostname.private/sensor-dbm-cisco-entity-sensor-8021.rrd:sensor:AVERAGE LINE1.5:sensor#cc0000:'Te2/1 Receive Powe ’ GPRINT:sensor:MIN:%5.2lfdBm GPRINT:sensor:LAST:%5.2lfdBm GPRINT:sensor:MAX:%5.2lfdBm\l HRULE:0#999999::dashes HRULE:-16.5#999999::dashes

RRDTool Output

OK u:0.11 s:0.01 r:0.11

looks correct what does the graph look like? (screenshot)

The graph only contains a scale from zero to one and the time scale, no data whatsoever, for any interval of time. Would you still like to see it?


yes, that’s why I asked :wink:

Here it is:

Everything is working correctly.

The device reports 0 for that sensor:
.*.*.*.1.4.8021 = 0 (which is actually . = 0)

So this would be an SNMP configuration problem on the device side?

Either that or the SFP hardware doesn’t give the data.

It’s probably a configuration problem then, we have that same SFP on a different device and the graphs work perfectly.

Thanks for the help