root@syslog:/etc/syslog-ng/conf.d# cat /etc/systemd/system/multi-user.target.wants/syslog-ng.service
[Unit]
Description=System Logger Daemon
Documentation=man:syslog-ng(8)

[Service]
Environment=LD_LIBRARY_PATH=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/:$LD_LIBRARY_PATH
Type=notify
ExecStart=/usr/sbin/syslog-ng -F $SYSLOGNG_OPTS
ExecReload=/bin/kill -HUP $MAINPID
EnvironmentFile=-/etc/default/syslog-ng
EnvironmentFile=-/etc/sysconfig/syslog-ng
StandardOutput=journal
StandardError=journal
Restart=on-failure

[Install]
WantedBy=multi-user.target