[Unit]
Description=Disk Cache Cleaning Daemon for Apache HTTP Server
After=apache2.service
Documentation=https://httpd.apache.org/docs/2.4/programs/htcacheclean.html

[Service]
Type=forking
User=wwwrun
Environment=HTCACHECLEAN_SIZE=300M
Environment=HTCACHECLEAN_DAEMON_INTERVAL=120
Environment=HTCACHECLEAN_PATH=/var/lib/apache/diskcache
Environment=HTCACHECLEAN_OPTIONS=-n
#EnvironmentFile=-/etc/default/apache-htcacheclean
ExecStart=/usr/sbin/htcacheclean -d $HTCACHECLEAN_DAEMON_INTERVAL -p $HTCACHECLEAN_PATH -l $HTCACHECLEAN_SIZE $HTCACHECLEAN_OPTIONS

[Install]
WantedBy=multi-user.target