man: document SystemdOptions variable

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Zbigniew Jędrzejewski-Szmek 2019-08-01 17:16:39 +02:00
parent 53aa0d02ad
commit 28f0aef4c7
2 changed files with 13 additions and 10 deletions

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<refsect1>
<title>Description</title>
<para>The kernel, the initial RAM disk (initrd) and
basic userspace functionality may be configured at boot via
kernel command line arguments.</para>
<para>The kernel, the initial RAM disk (initrd) and basic userspace functionality may be configured at
boot via kernel command line arguments. In addition, various systemd tools look at the EFI variable
<literal>SystemdOptions</literal> (if available). Both sources are combined, but the kernel command line
has higher priority. Please note that <emphasis>the EFI variable is only used by systemd tools, and is
ignored by the kernel and other user space tools</emphasis>, so it is not a replacement for the kernel
command line.</para>
<para>For command line parameters understood by the kernel, please
see

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<refsect1>
<title>Kernel Command Line</title>
<para>When run as system instance systemd parses a number of
kernel command line arguments<footnote><para>If run inside a Linux
container these arguments may be passed as command line arguments
to systemd itself, next to any of the command line options listed
in the Options section above. If run outside of Linux containers,
these arguments are parsed from <filename>/proc/cmdline</filename>
instead.</para></footnote>:</para>
<para>When run as the system instance systemd parses a number of options listed below. They can be
specified as kernel command line arguments<footnote><para>If run inside a Linux container these arguments
may be passed as command line arguments to systemd itself, next to any of the command line options listed
in the Options section above. If run outside of Linux containers, these arguments are parsed from
<filename>/proc/cmdline</filename> instead.</para></footnote>, or through the
<literal>SystemdOptions</literal> EFI variable (on EFI systems). The kernel command line has higher
priority. Following variables are understood:</para>
<variablelist class='kernel-commandline-options'>
<varlistentry>