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1 | <?xml version='1.0'?> |
2 | <?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?> | |
3 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
4 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
5 | ||
6 | <refentry id="systemd-udevd.service"> | |
7 | <refentryinfo> | |
8 | <title>systemd-udevd.service</title> | |
9 | <productname>systemd</productname> | |
10 | <authorgroup> | |
11 | <author> | |
12 | <contrib>Developer</contrib> | |
13 | <firstname>Kay</firstname> | |
14 | <surname>Sievers</surname> | |
15 | <email>kay@vrfy.org</email> | |
16 | </author> | |
17 | </authorgroup> | |
18 | </refentryinfo> | |
19 | ||
20 | <refmeta> | |
21 | <refentrytitle>systemd-udevd.service</refentrytitle> | |
22 | <manvolnum>8</manvolnum> | |
23 | <refmiscinfo class="version"></refmiscinfo> | |
24 | </refmeta> | |
25 | ||
26 | <refnamediv> | |
27 | <refname>systemd-udevd.service</refname> | |
28 | <refname>systemd-udevd-control.socket</refname> | |
29 | <refname>systemd-udevd-kernel.socket</refname> | |
30 | <refname>systemd-udevd</refname> | |
31 | <refpurpose>Device event managing daemon</refpurpose> | |
32 | </refnamediv> | |
33 | ||
34 | <refsynopsisdiv> | |
35 | <para><filename>systemd-udevd.service</filename></para> | |
36 | <para><filename>systemd-udevd-control.socket</filename></para> | |
37 | <para><filename>systemd-udevd-kernel.socket</filename></para> | |
38 | ||
39 | <cmdsynopsis> | |
40 | <command>/usr/lib/systemd/systemd-udevd</command> | |
41 | <arg><option>--daemon</option></arg> | |
42 | <arg><option>--debug</option></arg> | |
43 | <arg><option>--children-max=</option></arg> | |
44 | <arg><option>--exec-delay=</option></arg> | |
45 | <arg><option>--resolve-names=early|late|never</option></arg> | |
46 | <arg><option>--version</option></arg> | |
47 | <arg><option>--help</option></arg> | |
48 | </cmdsynopsis> | |
49 | ||
50 | </refsynopsisdiv> | |
51 | ||
52 | <refsect1><title>Description</title> | |
53 | <para><command>systemd-udevd</command> listens to kernel uevents. | |
54 | For every event, systemd-udevd executes matching instructions | |
55 | specified in udev rules. See <citerefentry> | |
56 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
57 | </citerefentry>.</para> | |
58 | <para>The behavior of the running daemon can be changed with | |
59 | <command>udevadm control</command>.</para> | |
60 | </refsect1> | |
61 | ||
62 | <refsect1><title>Options</title> | |
63 | <variablelist> | |
64 | <varlistentry> | |
65 | <term><option>--daemon</option></term> | |
66 | <listitem> | |
67 | <para>Detach and run in the background.</para> | |
68 | </listitem> | |
69 | </varlistentry> | |
70 | <varlistentry> | |
71 | <term><option>--debug</option></term> | |
72 | <listitem> | |
73 | <para>Print debug messages to stderr.</para> | |
74 | </listitem> | |
75 | </varlistentry> | |
76 | <varlistentry> | |
77 | <term><option>--children-max=</option></term> | |
78 | <listitem> | |
79 | <para>Limit the number of events executed in parallel.</para> | |
80 | </listitem> | |
81 | </varlistentry> | |
82 | <varlistentry> | |
83 | <term><option>--exec-delay=</option></term> | |
84 | <listitem> | |
85 | ||
86 | <para>Delay the execution of RUN instruction by the given | |
87 | number of seconds. This option might be useful when | |
88 | debugging system crashes during coldplug caused by loading | |
89 | non-working kernel modules.</para> | |
90 | </listitem> | |
91 | </varlistentry> | |
92 | <varlistentry> | |
93 | <term><option>--resolve-names=</option></term> | |
94 | <listitem> | |
95 | <para>Specify when systemd-udevd should resolve names of users and groups. | |
96 | When set to <option>early</option> (the default) names will be | |
97 | resolved when the rules are parsed. When set to | |
98 | <option>late</option> names will be resolved for every event. | |
99 | When set to <option>never</option> names will never be resolved | |
100 | and all devices will be owned by root.</para> | |
101 | </listitem> | |
102 | </varlistentry> | |
103 | <varlistentry> | |
104 | <term><option>--version</option></term> | |
105 | <listitem> | |
106 | <para>Print version number.</para> | |
107 | </listitem> | |
108 | </varlistentry> | |
109 | <varlistentry> | |
110 | <term><option>--help</option></term> | |
111 | <listitem> | |
112 | <para>Print help text.</para> | |
113 | </listitem> | |
114 | </varlistentry> | |
115 | </variablelist> | |
116 | </refsect1> | |
117 | ||
118 | <refsect1><title>Environment</title> | |
119 | <variablelist class='environment-variables'> | |
120 | <varlistentry> | |
121 | <term><varname>$UDEV_LOG=</varname></term> | |
122 | <listitem> | |
123 | <para>Set the logging priority.</para> | |
124 | </listitem> | |
125 | </varlistentry> | |
126 | </variablelist> | |
127 | </refsect1> | |
128 | ||
129 | <refsect1><title>Kernel command line</title> | |
130 | <variablelist class='kernel-commandline-options'> | |
131 | <para>Parameters starting with "rd." will be read when | |
132 | <command>systemd-udevd</command> is used in an initrd.</para> | |
133 | <varlistentry> | |
134 | <term><varname>udev.log-priority=</varname></term> | |
135 | <term><varname>rd.udev.log-priority=</varname></term> | |
136 | <listitem> | |
137 | <para>Set the logging priority.</para> | |
138 | </listitem> | |
139 | </varlistentry> | |
140 | <varlistentry> | |
141 | <term><varname>udev.children-max=</varname></term> | |
142 | <term><varname>rd.udev.children-max=</varname></term> | |
143 | <listitem> | |
144 | <para>Limit the number of events executed in parallel.</para> | |
145 | </listitem> | |
146 | </varlistentry> | |
147 | <varlistentry> | |
148 | <term><varname>udev.exec-delay=</varname></term> | |
149 | <term><varname>rd.udev.exec-delay=</varname></term> | |
150 | <listitem> | |
151 | <para>Delay the execution of RUN instruction by the given | |
152 | number of seconds. This option might be useful when | |
153 | debugging system crashes during coldplug caused by loading | |
154 | non-working kernel modules.</para> | |
155 | </listitem> | |
156 | </varlistentry> | |
157 | <varlistentry> | |
158 | <term><varname>net.ifnames=</varname></term> | |
159 | <listitem> | |
160 | <para>Network interfaces are renamed to give them predictable names | |
161 | when possible. It is enabled by default, specifying 0 disables it.</para> | |
162 | </listitem> | |
163 | </varlistentry> | |
164 | </variablelist> | |
14228c0d MB |
165 | <!-- when adding entries here, consider also adding them |
166 | in kernel-command-line.xml --> | |
663996b3 MS |
167 | </refsect1> |
168 | ||
169 | <refsect1><title>Configuration file</title> | |
170 | <para>udev expects its main configuration file at <filename>/etc/udev/udev.conf</filename>. | |
171 | It consists of a set of variables allowing the user to override default udev values. All | |
172 | empty lines or lines beginning with '#' are ignored. The following variables can be | |
173 | set:</para> | |
174 | <variablelist> | |
175 | <varlistentry> | |
176 | <term><varname>udev_log</varname></term> | |
177 | <listitem> | |
178 | <para>The logging priority. Valid values are the numerical syslog priorities | |
179 | or their textual representations: <option>err</option>, <option>info</option> | |
180 | and <option>debug</option>.</para> | |
181 | </listitem> | |
182 | </varlistentry> | |
183 | </variablelist> | |
184 | </refsect1> | |
185 | ||
186 | <refsect1> | |
187 | <title>See Also</title> | |
188 | <para><citerefentry> | |
189 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
190 | </citerefentry>, <citerefentry> | |
191 | <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum> | |
192 | </citerefentry></para> | |
193 | </refsect1> | |
194 | </refentry> |