celery/extra/systemd/celery.service

[Unit]
Description=Celery Service
After=network.target

[Service]
Type=forking
User=celery
Group=celery
EnvironmentFile=-/etc/conf.d/celery
WorkingDirectory=/opt/myproject/
ExecStart=${CELERY_BIN} multi start $CELERYD_NODES -A \
	$CELERY_APP -logfile=${CELERYD_LOG_FILE} \
	--pidfile=${CELERYD_PID_FILE} $CELERYD_OPTS
ExecStop=${CELERY_BIN} multi stopwait $CELERYD_NODES \
	--pidfile=${CELERYD_PID_FILE}
ExecReload=${CELERY_BIN} multi restart $CELERYD_NODES -A \
	$CELERY_APP --pidfile=${CELERYD_PID_FILE} --logfile=${CELERYD_LOG_FILE} \
	--loglevel="${CELERYD_LOG_LEVEL}" $CELERYD_OPTS

[Install]
WantedBy=multi-user.target