Tag Archives: error

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

LibreNMS Devices Disappeared from Web Interface

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What do you do when all your devices disappear from the web interface?

Everything still appears to be working. Alerts work.

Running a MySQL command to check if the devices are in the database returns all the devices

mysql -u librenms -p librenms -e 'use librenms ; select hostname,sysName,status from devices where status=1'

If we try going to /addhost we are greeted with an Error You have insuffecient permissions to view this page.

Running ./validate.php returns everything good

Potentially it could be an issue with SElinux or with Apache/NGinx

Running 

audit2why < /var/log/audit/audit.log

Doesn’t return anything

No errors pop up in the Logs

Could be something happened with the LibreNMS user.

Test a different LibreNMS user and all the devices show up.

We’ve now isolated the issue to being something with out user.

VirtualBox – Failed to acquire the VirtualBox COM object.

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VirtualBox failed to acquire the VirtualBox COM object.

Under the Details it was complaining about VirtualBox.xml

Looking in Windows Explorer in the .VirtualBox folder

C:\Users\Username\.VirtualBox

it shows that the VirtualBox.xml file being empty. Delete the file. Reinstall VirtualBox. Now go to your VM’s in

C:\Users\Username\VirtualBox VMs

Open up the VM folder and double click on the “Virtual Machine Definition” file to “reimport” them into VirtualBox.

Error Starting Peertube “no such file or directory, open ‘/var/www/peertube/storage/tmp/plugins-global.css”

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systemctl status peertube shows the following error.

Error: ENOENT: no such file or directory, open ‘/var/www/peertube/storage/tmp/plugins-global.css’

Looks like an error because the global.css file is not there. You can temporarily fix the issue by creating the file.

su peertube
touch /var/www/peertube/storage/tmp/plugins-global.css

Probably an issue with a plugin being installed or something of the sort.

Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.

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Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.

Arduino upload error

Looks like this can randomly happen. Things to try to resolve the problem

  1. Unplug USB cable for a little bit
  2. Restart Arduino IDE
  3. Reboot computer

More information here

https://arduino.stackexchange.com/questions/23620/problem-uploading-to-arduino-uno

LibreNMS ./validate.sh – Some folders have incorrect file permissions, this may cause issues.

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Helpful article here. https://wifitechtalk.com/librenms-permissions-error/

When running the following command,

sudo /opt/librenms/validate.sh

I’ve been getting the following errors.

[FAIL]  Some folders have incorrect file permissions, this may cause issues.
    [FIX]: 
    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/
    Files:
     /opt/librenms/storage/framework/views/adc52b677409cdba8d8e89dc

You can run the commands and fix the problem, but they pop up later and it does the same thing.

Create Script to fix permissions

Work around is to have a script run these commands every few minutes.

vi /root/librenms_fix_permissions.sh

Add the following

#!/bin/bash 
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/

Make the script executable

sudo chmod +x librenms_fix_permissions.sh

Add to Crontab

sudo crontab -e

Add the following entry to Cron to run every 30 minutes

*/30 * * * * /root/librenms_fix_permissions.sh

Unity not loading scene levels

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Problem: Game would finish level, but would not load next one.

The issue was that all the levels were not included in the build scene, (File -> Build Settings -> Scenes In Build) so even though the level was correct in PlayMaker, it would not load the level in the Game window while testing.

To add scene to build, open the scene up in the editor, then open the Build Settings from File -> Build Settings… or Ctrl+Shift+B and Add Open Scenes