Multiport graph widget does not work with empty data

When adding a port that has no previous data collected (standby port in a HA firewall setup) to a multiport graph widget, the graph is not drawn at all and the RRDtool outputs a message “ERROR: absolute path names not allowed when talking to a remote daemon”.

Generating graphs seems to be working fine when all ports have some traffic. Single port graphs work even without any data, they just draw nothing.


Component Version
LibreNMS 1.69-69-g0a7586b9f
DB Schema 2020_10_12_095504_mempools_add_oids (191)
PHP 7.4.3
Python 3.8.5
MySQL 10.3.25-MariaDB-0ubuntu0.20.04.1
RRDTool 1.7.2


[OK] Composer Version: 2.0.8
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[INFO] Detected Python Wrapper
[OK] Connection to memcached is ok
[WARN] Global lnms shortcut not installed. lnms command must be run with full path
sudo ln -s /opt/librenms/lnms /usr/local/bin/lnms
[WARN] Bash completion not installed. lnms command tab completion unavailable.
sudo cp /opt/librenms/misc/lnms-completion.bash /etc/bash_completion.d/
[WARN] Your install is over 24 hours out of date, last update: Tue, 01 Dec 2020 07:45:53 +0000
Make sure your cron is running and run ./ by hand to see if there are any errors.

Weird, in my setup the RRDcached was on the same server as the web-server. Using unix-socket instead of tcp-socket in config.php seems to have solved this issue.