nebula/examples/service_scripts/nebula.service

[Unit]
Description=nebula
Wants=basic.target
After=basic.target network.target
Before=sshd.service

[Service]
SyslogIdentifier=nebula
StandardOutput=syslog
StandardError=syslog
ExecReload=/bin/kill -HUP $MAINPID
ExecStart=/usr/local/bin/nebula -config /etc/nebula/config.yml
Restart=always

[Install]
WantedBy=multi-user.target