tree-wide: drop license boilerplate

[thirdparty/systemd.git] / man / systemd-getty-generator.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
  SPDX-License-Identifier: LGPL-2.1+

  This file is part of systemd.

  Copyright 2012 Lennart Poettering
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<refentry id="systemd-getty-generator">

  <refentryinfo>
    <title>systemd-getty-generator</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Lennart</firstname>
        <surname>Poettering</surname>
        <email>lennart@poettering.net</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-getty-generator</refentrytitle>
    <manvolnum>8</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-getty-generator</refname>
    <refpurpose>Generator for enabling getty instances on the
    console</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>/usr/lib/systemd/system-generators/systemd-getty-generator</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><filename>systemd-getty-generator</filename> is a generator
    that automatically instantiates
    <filename>serial-getty@.service</filename> on the kernel
    console(s), if they can function as ttys and are not provided by
    the virtual console subsystem. It will also instantiate
    <filename>serial-getty@.service</filename> instances for
    virtualizer consoles, if execution in a virtualized environment is
    detected. If execution in a container environment is detected, it
    will instead enable <filename>console-getty.service</filename> for
    <filename>/dev/console</filename>, and
    <filename>container-getty@.service</filename> instances for
    additional container pseudo TTYs as requested by the container
    manager (see <ulink
    url="https://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/"><filename>Container
    Interface</filename></ulink>). This should ensure that the user is
    shown a login prompt at the right place, regardless of which
    environment the system is started in. For example, it is
    sufficient to redirect the kernel console with a kernel command
    line argument such as <varname>console=</varname> to get both
    kernel messages and a getty prompt on a serial TTY. See <ulink
    url="https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink>
    for more information on the <varname>console=</varname> kernel
    parameter.</para>

    <para><filename>systemd-getty-generator</filename> implements
    <citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>

    <para>Further information about configuration of gettys can be
    found in
    <ulink url="http://0pointer.de/blog/projects/serial-console.html">systemd
    for Administrators, Part XVI: Gettys on Serial Consoles (and
    Elsewhere)</ulink>.</para>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry project='man-pages'><refentrytitle>agetty</refentrytitle><manvolnum>8</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>