специальные юниты systemd (Special systemd units)
Примечание (Note)
1. Running Services After the Network is up
https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
2. Syslog Interface
https://www.freedesktop.org/wiki/Software/systemd/syslog
3. Desktop Environments
https://systemd.io/DESKTOP_ENVIRONMENTS
