This is my working logrotate. /var/log is mounted as tmpfs in fstab. # vi /etc/logrotate.d/domoticz /var/log/domoticz.log { # size 5M daily rotate 1 compress dateext # maxage 1 postrotate /usr/bin/killall -HUP /home/pi/domoticz/domoticz endscript su root root }