216 lines
5.6 KiB
HTML
216 lines
5.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SYSTEMD-UDEVD.SERVICE</TITLE>
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</HEAD><BODY>
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<H1>SYSTEMD-UDEVD.SERVICE</H1>
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Section: systemd-udevd.service (8)<BR>Updated: <BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-udevd - Device event managing daemon
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<P>
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systemd-udevd.service
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<P>
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systemd-udevd-control.socket
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<P>
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systemd-udevd-kernel.socket
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<DL COMPACT>
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<DT id="1">
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<B>/lib/systemd/systemd-udevd</B> [<B>--daemon</B>] [<B>--debug</B>] [<B>--children-max=</B>] [<B>--exec-delay=</B>] [<B>--event-timeout=</B>] [<B>--resolve-names=early|late|never</B>] [<B>--version</B>] [<B>--help</B>]
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<P>
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<B>systemd-udevd</B>
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<DD>listens to kernel uevents. For every event, systemd-udevd executes matching instructions specified in udev rules. See
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<B><A HREF="/cgi-bin/man/man2html?7+udev">udev</A></B>(7).
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<P>
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The behavior of the daemon can be configured using
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<B><A HREF="/cgi-bin/man/man2html?5+udev.conf">udev.conf</A></B>(5), its command line options, environment variables, and on the kernel command line, or changed dynamically with
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<B>udevadm control</B>.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<P>
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<B>-d</B>, <B>--daemon</B>
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<DL COMPACT><DT id="2"><DD>
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Detach and run in the background.
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</DL>
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<P>
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<B>-D</B>, <B>--debug</B>
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<DL COMPACT><DT id="3"><DD>
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Print debug messages to standard error.
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</DL>
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<P>
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<B>-c=</B>, <B>--children-max=</B>
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<DL COMPACT><DT id="4"><DD>
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Limit the number of events executed in parallel.
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</DL>
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<P>
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<B>-e=</B>, <B>--exec-delay=</B>
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<DL COMPACT><DT id="5"><DD>
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Delay the execution of
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<I>RUN</I>
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instructions by the given number of seconds. This option might be useful when debugging system crashes during coldplug caused by loading non-working kernel modules.
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</DL>
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<P>
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<B>-t=</B>, <B>--event-timeout=</B>
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<DL COMPACT><DT id="6"><DD>
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Set the number of seconds to wait for events to finish. After this time, the event will be terminated. The default is 180 seconds.
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</DL>
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<P>
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<B>-N=</B>, <B>--resolve-names=</B>
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<DL COMPACT><DT id="7"><DD>
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Specify when systemd-udevd should resolve names of users and groups. When set to
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<B>early</B>
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(the default), names will be resolved when the rules are parsed. When set to
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<B>late</B>, names will be resolved for every event. When set to
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<B>never</B>, names will never be resolved and all devices will be owned by root.
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</DL>
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<P>
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<B>-h</B>, <B>--help</B>
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<DL COMPACT><DT id="8"><DD>
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Print a short help text and exit.
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</DL>
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<P>
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<B>--version</B>
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<DL COMPACT><DT id="9"><DD>
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Print a short version string and exit.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>KERNEL COMMAND LINE</H2>
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<P>
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Parameters starting with "rd." will be read when
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<B>systemd-udevd</B>
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is used in an initrd.
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<P>
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<I>udev.log_priority=</I>, <I>rd.udev.log_priority=</I>
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<DL COMPACT><DT id="10"><DD>
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Set the log level.
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</DL>
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<P>
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<I>udev.children_max=</I>, <I>rd.udev.children_max=</I>
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<DL COMPACT><DT id="11"><DD>
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Limit the number of events executed in parallel.
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</DL>
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<P>
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<I>udev.exec_delay=</I>, <I>rd.udev.exec_delay=</I>
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<DL COMPACT><DT id="12"><DD>
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Delay the execution of
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<I>RUN</I>
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instructions by the given number of seconds. This option might be useful when debugging system crashes during coldplug caused by loading non-working kernel modules.
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</DL>
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<P>
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<I>udev.event_timeout=</I>, <I>rd.udev.event_timeout=</I>
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<DL COMPACT><DT id="13"><DD>
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Wait for events to finish up to the given number of seconds. This option might be useful if events are terminated due to kernel drivers taking too long to initialize.
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</DL>
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<P>
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<I>net.ifnames=</I>
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<DL COMPACT><DT id="14"><DD>
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Network interfaces are renamed to give them predictable names when possible. It is enabled by default; specifying 0 disables it.
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</DL>
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<P>
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<I>net.naming-scheme=</I>
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<DL COMPACT><DT id="15"><DD>
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Network interfaces are renamed to give them predictable names when possible (unless
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<I>net.ifnames=0</I>
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is specified, see above). With this kernel command line option it is possible to pick a specific version of this algorithm and override the default chosen at compilation time. Expects one of the naming scheme identifiers listed in
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<B><A HREF="/cgi-bin/man/man2html?7+systemd.net-naming-scheme">systemd.net-naming-scheme</A></B>(7), or
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"latest"
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to select the latest scheme known (to this particular version of
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systemd-udevd.service).
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<P>
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Note that selecting a specific scheme is not sufficient to fully stabilize interface naming: the naming is generally derived from driver attributes exposed by the kernel. As the kernel is updated, previously missing attributes
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systemd-udevd.service
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is checking might appear, which affects older name derivation algorithms, too.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<P>
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<B><A HREF="/cgi-bin/man/man2html?5+udev.conf">udev.conf</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?7+udev">udev</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?8+udevadm">udevadm</A></B>(8)
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="16"><A HREF="#lbAB">NAME</A><DD>
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<DT id="17"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="18"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="19"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="20"><A HREF="#lbAF">KERNEL COMMAND LINE</A><DD>
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<DT id="21"><A HREF="#lbAG">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:17 GMT, March 31, 2021
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</BODY>
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</HTML>
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