Systemd

Manage Services

systemctl start nginx.service
systemctl stop nginx.service
systemctl restart nginx.service
systemctl reload nginx.service

Start on Boot

systemctl enable nginx.service
systemctl disable nginx.service

Services are called "units"

systemctl list-units        # show active services in memory
systemctl list-units --all  # show all services in memory
systemctl list-unit-files   # show all possible units

Reading Logs

journalctl      # show all logs
journalctl -b   # show all logs since last boot
journalctl -k   # show only kernel logs
journalctl -b -u nginx.service  # show logs for a service since boot