2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.2//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
6 SPDX-License-Identifier: LGPL-2.1+
9 <refentry id=
"udev.conf"
10 xmlns:
xi=
"http://www.w3.org/2001/XInclude">
13 <title>udev.conf
</title>
14 <productname>systemd
</productname>
18 <refentrytitle>udev.conf
</refentrytitle>
19 <manvolnum>5</manvolnum>
23 <refname>udev.conf
</refname>
24 <refpurpose>Configuration for device event managing daemon
</refpurpose>
28 <para><filename>/etc/udev/udev.conf
</filename></para>
32 <title>Description
</title>
35 <citerefentry><refentrytitle>systemd-udevd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
36 expects its main configuration file at
37 <filename>/etc/udev/udev.conf
</filename>. It consists of a set
38 of variables allowing the user to override default udev
39 values. All empty lines or lines beginning with '#' are
40 ignored. The following variables can be set:
45 <term><varname>udev_log=
</varname></term>
48 <para>The log level. Valid values are the numerical
49 syslog priorities or their textual representations:
50 <option>err
</option>,
<option>info
</option> and
51 <option>debug
</option>.
</para>
56 <term><varname>children_max=
</varname></term>
59 <para>An integer. The maximum number of events executed in parallel.
</para>
61 <para>This is the same as the
<option>--children-max=
</option> option.
</para>
66 <term><varname>exec_delay=
</varname></term>
69 <para>An integer. Delay the execution of
<varname>RUN
</varname>
70 instructions by the given number of seconds. This option
71 might be useful when debugging system crashes during
72 coldplug caused by loading non-working kernel
75 <para>This is the same as the
<option>--exec-delay=
</option> option.
</para>
80 <term><varname>event_timeout=
</varname></term>
83 <para>An integer. The number of seconds to wait for events to finish. After
84 this time, the event will be terminated. The default is
180 seconds.
</para>
86 <para>This is the same as the
<option>--event-timeout=
</option> option.
</para>
91 <term><varname>resolve_names=
</varname></term>
94 <para>Specifes when systemd-udevd should resolve names of users and groups. When set to
95 <option>early
</option> (the default), names will be resolved when the rules are parsed.
96 When set to
<option>late
</option>, names will be resolved for every event. When set to
97 <option>never
</option>, names will never be resolved and all devices will be owned by
100 <para>This is the same as the
<option>--resolve-names=
</option> option.
</para>
106 In addition,
<filename>systemd-udevd
</filename> can be configured
107 by command line options and the kernel command line (see
108 <citerefentry><refentrytitle>systemd-udevd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>).
113 <title>See Also
</title>
115 <citerefentry><refentrytitle>systemd-udevd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
116 <citerefentry><refentrytitle>udev
</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
117 <citerefentry><refentrytitle>udevadm
</refentrytitle><manvolnum>8</manvolnum></citerefentry>