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Diffstat (limited to 'man/systemd.xml')
| -rw-r--r-- | man/systemd.xml | 50 |
1 files changed, 32 insertions, 18 deletions
diff --git a/man/systemd.xml b/man/systemd.xml index c7aed3c6ff..06d2ecf6f8 100644 --- a/man/systemd.xml +++ b/man/systemd.xml @@ -285,25 +285,27 @@ <title>Concepts</title> <para>systemd provides a dependency system between - various entities called "units". Units encapsulate - various objects that are relevant for system boot-up - and maintenance. The majority of units are configured - in unit configuration files, whose syntax and basic - set of options is described in + various entities called "units" of 12 different + types. Units encapsulate various objects that are + relevant for system boot-up and maintenance. The + majority of units are configured in unit configuration + files, whose syntax and basic set of options is + described in <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, however some are created automatically from other - configuration or dynamically from system state. Units - may be 'active' (meaning started, bound, plugged in, - ... depending on the unit type, see below), or - 'inactive' (meaning stopped, unbound, unplugged, ...), - as well as in the process of being activated or - deactivated, i.e. between the two states (these states - are called 'activating', 'deactivating'). A special - 'failed' state is available as well which is very - similar to 'inactive' and is entered when the service - failed in some way (process returned error code on - exit, or crashed, or an operation timed out). If this - state is entered the cause will be logged, for later + configuration, dynamically from system state or + programmatically at runtime. Units may be 'active' + (meaning started, bound, plugged in, ... depending on + the unit type, see below), or 'inactive' (meaning + stopped, unbound, unplugged, ...), as well as in the + process of being activated or deactivated, + i.e. between the two states (these states are called + 'activating', 'deactivating'). A special 'failed' + state is available as well which is very similar to + 'inactive' and is entered when the service failed in + some way (process returned error code on exit, or + crashed, or an operation timed out). If this state is + entered the cause will be logged, for later reference. Note that the various unit types may have a number of additional substates, which are mapped to the five generalized unit states described @@ -312,7 +314,7 @@ <para>The following unit types are available:</para> <orderedlist> - <listitem><para>Service units, which control + <listitem><para>Service units, which start and control daemons and the processes they consist of. For details see <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem> @@ -369,6 +371,18 @@ objects change or are modified. See <citerefentry><refentrytitle>systemd.path</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem> + <listitem><para>Slice units may be used to + group units which manage system processes + (such as service and scope units) in a + hierachial tree for resource management + purposes. See + <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem> + + <listitem><para>Scope units are similar to + service units, but manage foreign processes + instead of starting them as well. See + <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem> + </orderedlist> <para>Units are named as their configuration |