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man: add section about user manager units
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@ -160,6 +160,45 @@ emergency.service | | |
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later in boot.</para>
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</refsect1>
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<refsect1>
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<title>User manager startup</title>
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<para>The system manager starts the <filename>user@<replaceable>uid</replaceable>.service</filename> unit
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for each user, which launches a separate unprivileged instance of <command>systemd</command> for each
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user — the user manager. Similarly to the system manager, the user manager starts units which are pulled
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in by <filename>default.target</filename>. The following chart is a structural overview of the well-known
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user units. For non-graphical sessions, <filename>default.target</filename> is used. Whenever the user
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logs into a graphical session, the login manager will start the
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<filename>graphical-session.target</filename> target that is used to pull in units required for the
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grahpical session. A number of targets (shown on the right side) are started when specific hardware is
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available to the user.</para>
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<programlisting>
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(various (various (various
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timers...) paths...) sockets...) (sound devices)
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| | | |
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v v v v
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timers.target paths.target sockets.target sound.target
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| | |
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\______________ _|_________________/ (bluetooth devices)
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\ / |
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V v
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basic.target bluetooth.target
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__________/ \_______ (smartcard devices)
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/ \ |
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| | v
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| v smartcard.target
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v graphical-session-pre.target
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(various user services) | (printers)
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| v |
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| (services for the graphical sesion) v
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| | printer.target
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v v
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<emphasis>default.target</emphasis> graphical-session.target</programlisting>
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</refsect1>
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<refsect1>
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<title>Bootup in the Initial RAM Disk (initrd)</title>
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<para>The initial RAM disk implementation (initrd) can be set up
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