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3802a3d3 | 1 | <?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> |
63749b1a | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
420a506e | 4 | |
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5 | <refentry id="systemd-udevd.service" |
6 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
7 | ||
63749b1a | 8 | <refentryinfo> |
49408357 | 9 | <title>systemd-udevd.service</title> |
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10 | <productname>systemd</productname> |
11 | <authorgroup> | |
12 | <author> | |
13 | <contrib>Developer</contrib> | |
14 | <firstname>Kay</firstname> | |
15 | <surname>Sievers</surname> | |
16 | <email>kay@vrfy.org</email> | |
17 | </author> | |
18 | </authorgroup> | |
63749b1a | 19 | </refentryinfo> |
420a506e | 20 | |
63749b1a | 21 | <refmeta> |
bad1837c | 22 | <refentrytitle>systemd-udevd.service</refentrytitle> |
63749b1a | 23 | <manvolnum>8</manvolnum> |
63749b1a | 24 | </refmeta> |
420a506e | 25 | |
63749b1a | 26 | <refnamediv> |
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27 | <refname>systemd-udevd.service</refname> |
28 | <refname>systemd-udevd-control.socket</refname> | |
29 | <refname>systemd-udevd-kernel.socket</refname> | |
bad1837c | 30 | <refname>systemd-udevd</refname> |
b79f817b | 31 | <refpurpose>Device event managing daemon</refpurpose> |
63749b1a | 32 | </refnamediv> |
420a506e | 33 | |
63749b1a | 34 | <refsynopsisdiv> |
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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> | |
b79f817b | 38 | |
63749b1a | 39 | <cmdsynopsis> |
12b42c76 | 40 | <command>/usr/lib/systemd/systemd-udevd</command> |
63749b1a | 41 | <arg><option>--daemon</option></arg> |
63749b1a | 42 | <arg><option>--debug</option></arg> |
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43 | <arg><option>--children-max=</option></arg> |
44 | <arg><option>--exec-delay=</option></arg> | |
9719859c | 45 | <arg><option>--event-timeout=</option></arg> |
63749b1a | 46 | <arg><option>--resolve-names=early|late|never</option></arg> |
9fa68615 | 47 | <arg><option>--version</option></arg> |
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48 | <arg><option>--help</option></arg> |
49 | </cmdsynopsis> | |
b79f817b | 50 | |
63749b1a | 51 | </refsynopsisdiv> |
420a506e | 52 | |
63749b1a | 53 | <refsect1><title>Description</title> |
b8e8f0cb | 54 | <para><command>systemd-udevd</command> listens to kernel uevents. |
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55 | For every event, systemd-udevd executes matching instructions |
56 | specified in udev rules. See <citerefentry> | |
57 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
58 | </citerefentry>.</para> | |
59 | ||
203af57f ZJS |
60 | <para>The behavior of the daemon can be configured using |
61 | <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
81c7dd89 LP |
62 | its command line options, environment variables, and on the kernel |
63 | command line, or changed dynamically with <command>udevadm | |
203af57f | 64 | control</command>. |
6fc5a404 | 65 | </para> |
63749b1a | 66 | </refsect1> |
420a506e | 67 | |
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68 | <refsect1><title>Options</title> |
69 | <variablelist> | |
70 | <varlistentry> | |
71 | <term><option>--daemon</option></term> | |
72 | <listitem> | |
73 | <para>Detach and run in the background.</para> | |
74 | </listitem> | |
75 | </varlistentry> | |
dfdebb1b | 76 | |
63749b1a | 77 | <varlistentry> |
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78 | <term><option>--debug</option></term> |
79 | <listitem> | |
6db27428 | 80 | <para>Print debug messages to standard error.</para> |
9fa68615 KS |
81 | </listitem> |
82 | </varlistentry> | |
dfdebb1b | 83 | |
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84 | <varlistentry> |
85 | <term><option>--children-max=</option></term> | |
63749b1a | 86 | <listitem> |
b8e8f0cb | 87 | <para>Limit the number of events executed in parallel.</para> |
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88 | </listitem> |
89 | </varlistentry> | |
dfdebb1b | 90 | |
63749b1a | 91 | <varlistentry> |
9fa68615 | 92 | <term><option>--exec-delay=</option></term> |
63749b1a | 93 | <listitem> |
6db27428 | 94 | <para>Delay the execution of <varname>RUN</varname> |
66f756d4 | 95 | instructions by the given number of seconds. This option |
6db27428 ZJS |
96 | might be useful when debugging system crashes during |
97 | coldplug caused by loading non-working kernel | |
98 | modules.</para> | |
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99 | </listitem> |
100 | </varlistentry> | |
dfdebb1b | 101 | |
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102 | <varlistentry> |
103 | <term><option>--event-timeout=</option></term> | |
104 | <listitem> | |
dd5eddd2 | 105 | <para>Set the number of seconds to wait for events to finish. After |
b938cb90 | 106 | this time, the event will be terminated. The default is 180 seconds.</para> |
9719859c HR |
107 | </listitem> |
108 | </varlistentry> | |
109 | ||
63749b1a | 110 | <varlistentry> |
9fa68615 | 111 | <term><option>--resolve-names=</option></term> |
63749b1a | 112 | <listitem> |
f13b388f | 113 | <para>Specify when systemd-udevd should resolve names of users and groups. |
73e231ab | 114 | When set to <option>early</option> (the default), names will be |
63749b1a | 115 | resolved when the rules are parsed. When set to |
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116 | <option>late</option>, names will be resolved for every event. |
117 | When set to <option>never</option>, names will never be resolved | |
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118 | and all devices will be owned by root.</para> |
119 | </listitem> | |
120 | </varlistentry> | |
dfdebb1b | 121 | |
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122 | <varlistentry> |
123 | <term><option>--help</option></term> | |
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124 | |
125 | <xi:include href="standard-options.xml" xpointer="help-text" /> | |
63749b1a | 126 | </varlistentry> |
dfdebb1b | 127 | <xi:include href="standard-options.xml" xpointer="version" /> |
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128 | </variablelist> |
129 | </refsect1> | |
420a506e | 130 | |
8f7f1a2b | 131 | <refsect1><title>Kernel command line</title> |
ccc9a4f9 | 132 | <variablelist class='kernel-commandline-options'> |
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133 | <para>Parameters starting with "rd." will be read when |
134 | <command>systemd-udevd</command> is used in an initrd.</para> | |
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135 | <varlistentry> |
136 | <term><varname>udev.log-priority=</varname></term> | |
e6f86cac | 137 | <term><varname>rd.udev.log-priority=</varname></term> |
8f7f1a2b | 138 | <listitem> |
f47ad593 | 139 | <para>Set the log level.</para> |
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140 | </listitem> |
141 | </varlistentry> | |
142 | <varlistentry> | |
143 | <term><varname>udev.children-max=</varname></term> | |
e6f86cac | 144 | <term><varname>rd.udev.children-max=</varname></term> |
8f7f1a2b | 145 | <listitem> |
b8e8f0cb | 146 | <para>Limit the number of events executed in parallel.</para> |
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147 | </listitem> |
148 | </varlistentry> | |
149 | <varlistentry> | |
150 | <term><varname>udev.exec-delay=</varname></term> | |
e6f86cac | 151 | <term><varname>rd.udev.exec-delay=</varname></term> |
8f7f1a2b | 152 | <listitem> |
ed7e5fe3 | 153 | <para>Delay the execution of <varname>RUN</varname> instructions by the given |
b8e8f0cb ZJS |
154 | number of seconds. This option might be useful when |
155 | debugging system crashes during coldplug caused by loading | |
156 | non-working kernel modules.</para> | |
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157 | </listitem> |
158 | </varlistentry> | |
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159 | <varlistentry> |
160 | <term><varname>udev.event-timeout=</varname></term> | |
161 | <term><varname>rd.udev.event-timeout=</varname></term> | |
162 | <listitem> | |
163 | <para>Wait for events to finish up to the given number | |
164 | of seconds. This option might be useful if events are | |
dd5eddd2 | 165 | terminated due to kernel drivers taking too long to initialize.</para> |
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166 | </listitem> |
167 | </varlistentry> | |
0cf2d0d0 | 168 | <varlistentry> |
5a33334b | 169 | <term><varname>net.ifnames=</varname></term> |
0cf2d0d0 | 170 | <listitem> |
5a33334b | 171 | <para>Network interfaces are renamed to give them predictable names |
bcddd5bf | 172 | when possible. It is enabled by default; specifying 0 disables it.</para> |
0cf2d0d0 TG |
173 | </listitem> |
174 | </varlistentry> | |
63749b1a | 175 | </variablelist> |
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176 | <!-- when adding entries here, consider also adding them |
177 | in kernel-command-line.xml --> | |
63749b1a | 178 | </refsect1> |
7b86ada7 | 179 | |
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180 | <refsect1> |
181 | <title>See Also</title> | |
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182 | <para> |
183 | <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
184 | <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
185 | <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
186 | </para> | |
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187 | </refsect1> |
188 | </refentry> |