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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="udev.conf"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>udev.conf</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>udev.conf</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>udev.conf</refname>
<refpurpose>Configuration for device event managing daemon</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/etc/udev/udev.conf</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
expects its main configuration file at
<filename>/etc/udev/udev.conf</filename>. It consists of a set
of variables allowing the user to override default udev
values. All empty lines or lines beginning with '#' are
ignored. The following variables can be set:
</para>
<variablelist class='config-directives'>
<varlistentry>
<term><varname>udev_log=</varname></term>
<listitem>
<para>The log level. Valid values are the numerical
syslog priorities or their textual representations:
<option>err</option>, <option>info</option> and
<option>debug</option>.</para>
<xi:include href="version-info.xml" xpointer="v216"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>children_max=</varname></term>
<listitem>
<para>An integer. The maximum number of events executed in parallel. When unspecified or 0 is
specified, the maximum is determined based on the system resources.</para>
<para>This is the same as the <option>--children-max=</option> option.</para>
<xi:include href="version-info.xml" xpointer="v240"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>exec_delay=</varname></term>
<listitem>
<para>An integer. Delay the execution of each <varname>RUN{<replaceable>program</replaceable>}</varname>
parameter by the given number of seconds. This option
might be useful when debugging system crashes during
coldplug caused by loading non-working kernel
modules.</para>
<para>This is the same as the <option>--exec-delay=</option> option.</para>
<xi:include href="version-info.xml" xpointer="v240"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>event_timeout=</varname></term>
<listitem>
<para>An integer. The number of seconds to wait for events to finish. After
this time, the event will be terminated. The default is 180 seconds.</para>
<para>This is the same as the <option>--event-timeout=</option> option.</para>
<xi:include href="version-info.xml" xpointer="v240"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>resolve_names=</varname></term>
<listitem>
<para>Specifies when systemd-udevd should resolve names of users and groups. When set to
<option>early</option> (the default), names will be resolved when the rules are parsed.
When set to <option>late</option>, names will be resolved for every event. When set to
<option>never</option>, names will never be resolved and all devices will be owned by
root.</para>
<para>This is the same as the <option>--resolve-names=</option> option.</para>
<xi:include href="version-info.xml" xpointer="v240"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>timeout_signal=</varname></term>
<listitem>
<para>Specifies a signal that <filename>systemd-udevd</filename> will send on worker
timeouts. Note that both workers and spawned processes will be killed using this
signal. Defaults to <option>SIGKILL</option>.</para>
<xi:include href="version-info.xml" xpointer="v246"/>
</listitem>
</varlistentry>
</variablelist>
<para>
In addition, <filename>systemd-udevd</filename> can be configured
by command line options and the kernel command line (see
<citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>).
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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