man/udev.conf.xml

   1 <?xml version='1.0'?>
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4 <!-- SPDX-License-Identifier: LGPL-2.1+ -->
   5
   6 <refentry id="udev.conf"
   7           xmlns:xi="http://www.w3.org/2001/XInclude">
   8
   9   <refentryinfo>
  10     <title>udev.conf</title>
  11     <productname>systemd</productname>
  12   </refentryinfo>
  13
  14   <refmeta>
  15     <refentrytitle>udev.conf</refentrytitle>
  16     <manvolnum>5</manvolnum>
  17   </refmeta>
  18
  19   <refnamediv>
  20     <refname>udev.conf</refname>
  21     <refpurpose>Configuration for device event managing daemon</refpurpose>
  22   </refnamediv>
  23
  24   <refsynopsisdiv>
  25     <para><filename>/etc/udev/udev.conf</filename></para>
  26   </refsynopsisdiv>
  27
  28   <refsect1>
  29     <title>Description</title>
  30
  31     <para>
  32       <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  33       expects its main configuration file at
  34       <filename>/etc/udev/udev.conf</filename>. It consists of a set
  35       of variables allowing the user to override default udev
  36       values. All empty lines or lines beginning with '#' are
  37       ignored. The following variables can be set:
  38     </para>
  39
  40     <variablelist class='config-directives'>
  41       <varlistentry>
  42         <term><varname>udev_log=</varname></term>
  43
  44         <listitem>
  45           <para>The log level. Valid values are the numerical
  46           syslog priorities or their textual representations:
  47           <option>err</option>, <option>info</option> and
  48           <option>debug</option>.</para>
  49         </listitem>
  50       </varlistentry>
  51
  52       <varlistentry>
  53         <term><varname>children_max=</varname></term>
  54
  55         <listitem>
  56           <para>An integer. The maximum number of events executed in parallel.</para>
  57
  58           <para>This is the same as the <option>--children-max=</option> option.</para>
  59         </listitem>
  60       </varlistentry>
  61
  62       <varlistentry>
  63         <term><varname>exec_delay=</varname></term>
  64
  65         <listitem>
  66           <para>An integer. Delay the execution of <varname>RUN</varname>
  67           instructions by the given number of seconds. This option
  68           might be useful when debugging system crashes during
  69           coldplug caused by loading non-working kernel
  70           modules.</para>
  71
  72           <para>This is the same as the <option>--exec-delay=</option> option.</para>
  73         </listitem>
  74       </varlistentry>
  75
  76       <varlistentry>
  77         <term><varname>event_timeout=</varname></term>
  78
  79         <listitem>
  80           <para>An integer. The number of seconds to wait for events to finish. After
  81           this time, the event will be terminated. The default is 180 seconds.</para>
  82
  83           <para>This is the same as the <option>--event-timeout=</option> option.</para>
  84         </listitem>
  85       </varlistentry>
  86
  87       <varlistentry>
  88         <term><varname>resolve_names=</varname></term>
  89
  90         <listitem>
  91           <para>Specifes when systemd-udevd should resolve names of users and groups.  When set to
  92           <option>early</option> (the default), names will be resolved when the rules are parsed.
  93           When set to <option>late</option>, names will be resolved for every event.  When set to
  94           <option>never</option>, names will never be resolved and all devices will be owned by
  95           root.</para>
  96
  97           <para>This is the same as the <option>--resolve-names=</option> option.</para>
  98         </listitem>
  99       </varlistentry>
 100     </variablelist>
 101
 102     <para>
 103       In addition, <filename>systemd-udevd</filename> can be configured
 104       by command line options and the kernel command line (see
 105       <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>).
 106     </para>
 107   </refsect1>
 108
 109   <refsect1>
 110     <title>See Also</title>
 111     <para>
 112       <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 113       <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 114       <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 115     </para>
 116   </refsect1>
 117 </refentry>