[Unit]
Description=LibreNMS: Data caching daemon of rrdtool 
After=network.service
Documentation=https://docs.librenms.org/Extensions/RRDCached/ man:rrdcached(1)

[Service]
Type=forking
PIDFile=/run/rrdcached.pid
ExecStart=/usr/bin/rrdcached \
    -w 1800 \ # Write to disk every 1800 seconds \
    -z 1800 \ # Delay updates by 1800 seconds \
    -f 3600 \ # Flush updates every 3600 seconds \
    -s librenms \ # Run socket librenms user \
    -U librenms \ # Run as user librenms \
    -G librenms \ # Run as group librenms \
    -B -R -j /var/tmp \ # Use /var/tmp for journal files \
    -l unix:/run/rrdcached.sock \ # Listen on UNIX socket \
    -t 4    \ # Use 4 threads \
    -F      \ # Force daemon mode \
    -b /opt/librenms/rrd/ \ # Base directory for RRD files 
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target