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   systemd.unit    ( 5 )

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MAPPING OF UNIT PROPERTIES TO THEIR INVERSES

Unit settings that create a relationship with a second unit
       usually show up in properties of both units, for example in
       systemctl show output. In some cases the name of the property is
       the same as the name of the configuration setting, but not
       always. This table lists the properties that are shown on two
       units which are connected through some dependency, and shows
       which property on "source" unit corresponds to which property on
       the "target" unit.

       Table 3.  Forward and reverse unit properties
       ┌──────────────────────┬───────────────────────┬───────────────────────────────┐
       │"Forward"             │ "Reverse"             │ Where used                    │
       │property              │ property              │                               │
       ├──────────────────────┼───────────────────────┼───────────────────────────────┤
       │Before=               │ After=                │                               │
       ├──────────────────────┼───────────────────────┤ [Unit] section                │
       │After=                │ Before=               │                               │
       ├──────────────────────┼───────────────────────┼────────────────┬──────────────┤
       │Requires=             │ RequiredBy=           │ [Unit] section │ [Install]    │
       │                      │                       │                │ section      │
       ├──────────────────────┼───────────────────────┼────────────────┼──────────────┤
       │Wants=                │ WantedBy=             │ [Unit] section │ [Install]    │
       │                      │                       │                │ section      │
       ├──────────────────────┼───────────────────────┼────────────────┼──────────────┤
       │PartOf=               │ ConsistsOf=           │ [Unit] section │ an automatic │
       │                      │                       │                │ property     │
       ├──────────────────────┼───────────────────────┼────────────────┼──────────────┤
       │BindsTo=              │ BoundBy=              │ [Unit] section │ an automatic │
       │                      │                       │                │ property     │
       ├──────────────────────┼───────────────────────┼────────────────┼──────────────┤
       │Requisite=            │ RequisiteOf=          │ [Unit] section │ an automatic │
       │                      │                       │                │ property     │
       ├──────────────────────┼───────────────────────┼────────────────┴──────────────┤
       │Triggers=             │ TriggeredBy=          │ Automatic properties, see     │
       │                      │                       │ notes below                   │
       ├──────────────────────┼───────────────────────┼────────────────┬──────────────┤
       │Conflicts=            │ ConflictedBy=         │ [Unit] section │ an automatic │
       │                      │                       │                │ property     │
       ├──────────────────────┼───────────────────────┼────────────────┴──────────────┤
       │PropagatesReloadTo=   │ ReloadPropagatedFrom= │                               │
       ├──────────────────────┼───────────────────────┤ [Unit] section                │
       │ReloadPropagatedFrom= │ PropagatesReloadTo=   │                               │
       ├──────────────────────┼───────────────────────┼────────────────┬──────────────┤
       │Following=            │ n/a                   │ An automatic   │              │
       │                      │                       │ property       │              │
       └──────────────────────┴───────────────────────┴────────────────┴──────────────┘

       Note: WantedBy= and RequiredBy= are used in the [Install] section
       to create symlinks in .wants/ and .requires/ directories. They
       cannot be used directly as a unit configuration setting.

       Note: ConsistsOf=, BoundBy=, RequisiteOf=, ConflictedBy= are
       created implicitly along with their reverses and cannot be
       specified directly.

       Note: Triggers= is created implicitly between a socket, path
       unit, or an automount unit, and the unit they activate. By
       default a unit with the same name is triggered, but this can be
       overridden using Sockets=, Service=, and Unit= settings. See
       systemd.service(5), systemd.socket(5), systemd.path(5), and
       systemd.automount(5) for details.  TriggeredBy= is created
       implicitly on the triggered unit.

       Note: Following= is used to group device aliases and points to
       the "primary" device unit that systemd is using to track device
       state, usually corresponding to a sysfs path. It does not show up
       in the "target" unit.