Tag Archives: rrd

LibreNMS Error “.sock: rrd_fetch_r failed:”

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The following error showed up after adding a new device to LibreNMS. 

.sock:rrd_fetch_r failed:

It was not displaying any graph data, but the device was up and connected.

Looks like the error is SELinux related. You can fix the error by resetting the security context with the following command.

sudo restorecon -RFv /opt/librenms

If that does not work, try running all the following

Running the following commands will fix the issue most of the time:

sudo chown -R librenms:librenms '/opt/librenms'

sudo setfacl -d -m g::rwx /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/logs /opt/librenms/rrd

sudo chmod -R ug=rwX /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/logs /opt/librenms/rrd

sudo semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/bootstrap/cache(/.*)?'

sudo semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/storage(/.*)?'

sudo semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/logs(/.*)?'

sudo semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/rrd(/.*)?'

sudo restorecon -RFv /opt/librenms

Manually create graph of device in LibreNMS

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In LibreNMS, you can hit the “Show RRD Command” to give you the command to manually create a graph.  Copy the command.

In the command below, the path shows the IP address of the device to generate the graph from.  Theoretically you can change that to a different IP to generate graphs from other devices.

SSH into server server and run the command, change /tmp/randomtext to something like /root/mikrotik_092619.png or whatever you want.  You can also adjust the size, color etc of the graph.

 rrdtool graph /tmp/randomtext --alt-y-grid --alt-autoscale-max --rigid -E --start 1515946500 --end 1516551300 --width 1712.7 --height 483 -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:'Volts Cur Min Max\n' DEF:sensor495=/opt/librenms/rrd/192.168.88.1/sensor-voltage-routeros-0.rrd:sensor:AVERAGE LINE1:sensor495#CC0000:'Voltage 0
 ' GPRINT:sensor495:LAST:%5.1lfV GPRINT:sensor495:MIN:%5.1lfV GPRINT:sensor495:MAX:%5.1lfV\l