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man: add section about user manager units

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Zbigniew Jędrzejewski-Szmek 2019-12-18 11:23:30 +01:00
parent f71502c49f
commit 277519db51
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man/bootup.xml
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@ -160,6 +160,45 @@ emergency.service | | |
later in boot.</para>
</refsect1>
<refsect1>
<title>User manager startup</title>
<para>The system manager starts the <filename>user@<replaceable>uid</replaceable>.service</filename> unit
for each user, which launches a separate unprivileged instance of <command>systemd</command> for each
user — the user manager. Similarly to the system manager, the user manager starts units which are pulled
in by <filename>default.target</filename>. The following chart is a structural overview of the well-known
user units. For non-graphical sessions, <filename>default.target</filename> is used. Whenever the user
logs into a graphical session, the login manager will start the
<filename>graphical-session.target</filename> target that is used to pull in units required for the
grahpical session. A number of targets (shown on the right side) are started when specific hardware is
available to the user.</para>
<programlisting>
(various (various (various
timers...) paths...) sockets...) (sound devices)
| | | |
v v v v
timers.target paths.target sockets.target sound.target
| | |
\______________ _|_________________/ (bluetooth devices)
\ / |
V v
basic.target bluetooth.target
|
__________/ \_______ (smartcard devices)
/ \ |
| | v
| v smartcard.target
v graphical-session-pre.target
(various user services) | (printers)
| v |
| (services for the graphical sesion) v
| | printer.target
v v
<emphasis>default.target</emphasis> graphical-session.target</programlisting>
</refsect1>
<refsect1>
<title>Bootup in the Initial RAM Disk (initrd)</title>
<para>The initial RAM disk implementation (initrd) can be set up