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ec07c3c80b
This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
122 lines
5.2 KiB
XML
122 lines
5.2 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-getty-generator" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-getty-generator</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-getty-generator</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-getty-generator</refname>
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<refpurpose>Generator for enabling getty instances on the
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console</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/usr/lib/systemd/system-generators/systemd-getty-generator</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-getty-generator</filename> is a generator that automatically instantiates
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<filename>serial-getty@.service</filename> on the kernel consoles, if they can function as ttys and are
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not provided by the virtual console subsystem. It will also instantiate
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<filename>serial-getty@.service</filename> instances for virtualizer consoles, if execution in a
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virtualized environment is detected. If execution in a container environment is detected, it will instead
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enable <filename>console-getty.service</filename> for <filename>/dev/console</filename>, and
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<filename>container-getty@.service</filename> instances for additional container pseudo TTYs as requested
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by the container manager (see <ulink url="https://systemd.io/CONTAINER_INTERFACE"><filename>Container
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Interface</filename></ulink>). This should ensure that the user is shown a login prompt at the right
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place, regardless of which environment the system is started in. For example, it is sufficient to
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redirect the kernel console with a kernel command line argument such as <varname>console=</varname> to
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get both kernel messages and a getty prompt on a serial TTY. See <ulink
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url="https://docs.kernel.org/admin-guide/kernel-parameters.html">The kernel's command-line
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parameters</ulink> for more information on the <varname>console=</varname> kernel parameter.</para>
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<para><filename>systemd-getty-generator</filename> implements
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<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
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<para>Further information about configuration of gettys can be
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found in
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<ulink url="https://0pointer.de/blog/projects/serial-console.html">systemd
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for Administrators, Part XVI: Gettys on Serial Consoles (and
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Elsewhere)</ulink>.</para>
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</refsect1>
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<refsect1>
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<title>Kernel Command Line</title>
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<para><filename>systemd-getty-generator</filename> understands the following
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<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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parameters:</para>
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<variablelist class='kernel-commandline-options'>
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<varlistentry>
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<term><varname>systemd.getty_auto=</varname></term>
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<listitem><para>this options take an optional boolean argument, and default to yes.
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The generator is enabled by default, and a false value may be used to disable it.
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</para>
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<xi:include href="version-info.xml" xpointer="v250"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$SYSTEMD_GETTY_AUTO</varname></term>
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<listitem><para>This variable takes an optional boolean argument, and default to yes.
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The generator is enabled by default, and a false value may be used to disable it.
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</para>
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<xi:include href="version-info.xml" xpointer="v250"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>System Credentials</title>
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<variablelist class='system-credentials'>
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<varlistentry>
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<term><varname>getty.ttys.serial</varname></term>
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<term><varname>getty.ttys.container</varname></term>
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<listitem><para>These system credentials may be used to spawn additional login prompts on selected
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TTYs. The two credentials should contain a newline-separated list of TTY names to spawn instances of
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<filename>serial-getty@.service</filename> (in case of <varname>getty.ttys.serial</varname>) and
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<filename>container-getty@.service</filename> (in case of <varname>getty.ttys.container</varname>)
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on.</para>
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.system-credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>agetty</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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