rspamd/centos/sources/rspamd.service

[Unit]
Description=rapid spam filtering system
After=syslog.target network.target remote-fs.target nss-lookup.target

[Service]
Type=simple
PIDFile=/var/run/rspamd/rspamd.pid
ExecStartPre=/usr/bin/rspamd -u rspamd -g rspamd -t
ExecStart=/usr/bin/rspamd -f -c /etc/rspamd/rspamd.conf -u rspamd -g rspamd
ExecStop=/bin/kill -s QUIT $MAINPID
WantedBy=multi-user.target