This works for me:

=> /etc/default/rrdcached

0: start rrdcached on boot, 1: do not start rrdcached on boot

default: 0

DISABLE=0

options to be passed to rrdcached

(do not specify -p - this is handled by the init script)

default: see /etc/init.d/rrdcached

OPTS="-w 1800 -z 1800 -f 3600 -s librenms -j /var/tmp -l unix:/var/run/rrdcached.sock -t4 -F -b /opt/librenms/rrd/"

number of seconds to wait for rrdcached to shut down

(writing the data to disk may take some time;

tune this according to your setup)

default: 30

MAXWAIT=30

0: do not enable core-files, 1: enable core-files ... if rrdcached crashes

default: 0

ENABLE_COREFILES=0

=> /opt/librenms/config.php

Enable this to use rrdcached. Be sure rrd_dir is within the rrdcached dir

and that your web server has permission to talk to rrdcached.

$config['rrdcached'] = "unix:/var/run/rrdcached.sock";