конфигурация агрегата (Unit configuration)
Автоматические зависимости (Automatic dependencies)
Implicit Dependencies
A number of unit dependencies are implicitly established,
depending on unit type and unit configuration. These implicit
dependencies can make unit configuration file cleaner. For the
implicit dependencies in each unit type, please refer to section
"Implicit Dependencies" in respective man pages.
For example, service units with Type=dbus automatically acquire
dependencies of type Requires= and After= on dbus.socket. See
systemd.service(5) for details.
Default Dependencies
Default dependencies are similar to implicit dependencies, but
can be turned on and off by setting DefaultDependencies= to yes
(the default) and no, while implicit dependencies are always in
effect. See section "Default Dependencies" in respective man
pages for the effect of enabling DefaultDependencies= in each
unit types.
For example, target units will complement all configured
dependencies of type Wants= or Requires= with dependencies of
type After= unless DefaultDependencies=no is set in the specified
units. See systemd.target(5) for details. Note that this behavior
can be turned off by setting DefaultDependencies=no.
