Solved: Rrdcached issues

MHammett · 30 July 2018 20:11

validate.php: https://p.libren.ms/view/b1013e23

I’m trying to move to rrdcached. I’m getting red boxes for graph previews and when I go to the graphs, I’m just getting the grid, no information. I followed the instructions at https://docs.librenms.org/#Extensions/RRDCached/

I haven’t found what doesn’t have the correct permissions as everything I’ve looked into so far seems to be correct.

I turn off the rrdcached config and service and Libre resumes graphing.

RRDTool Output

ERROR: rrdcached: /opt/librenms/rrd/733-nexus-3064/mempool-cemp-22.1.rrd: Permission denied

laf · 30 July 2018 20:35

You rrdtool graph command isn’t using rrdcached from what I can see. You’ve also moved the rrd dir to somewhere else and again the graph command isn’t using it.

You might need to set $config['rrd_dir'] to point to your new location.

MHammett · 30 July 2018 22:54

How would I fix that?

I haven’t intently changed anything relating to rrd’s storage directory. I don’t see any Libre settings directing it to a different location, so I suspect that’s not the right tree to be barking up, but then again, I’m the one with a broken install that Google hasn’t been able to help me fix.

Also, as I had mentioned, if I turn off rrdcached, graphing works again.

MHammett · 30 July 2018 23:59

I think I’m on to something. I think the documentation is bad.

Note my /etc/default/rrdcached. I changed that base_path to /opt/librenms/rrd/ and my graphs are no longer red. My RRDTool Output on the libre page now has the line OK u:0.18 s:0.04 r:0.22 added to the bottom. I see some lines on the graphs now, but there’s a big gap. If new data starts appearing, I’ll call it good and submit another documentation fix.

MHammett · 31 July 2018 00:19

Yup, that was it.

laf · 2 August 2018 20:19

Thanks for finding the issue and fixing.

MHammett · 2 August 2018 20:39

Thanks for putting up with me while I worked on it.