Imported Upstream version 219

[systemd.git] / man / systemd-udevd.service.8

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.TH "SYSTEMD\-UDEVD\&.SERVICE" "8" "" "systemd 219" "systemd-udevd.service"
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.SH "NAME"
systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-udevd \- Device event managing daemon
.SH "SYNOPSIS"
.PP
systemd\-udevd\&.service
.PP
systemd\-udevd\-control\&.socket
.PP
systemd\-udevd\-kernel\&.socket
.HP \w'\fB/usr/lib/systemd/systemd\-udevd\fR\ 'u
\fB/usr/lib/systemd/systemd\-udevd\fR [\fB\-\-daemon\fR] [\fB\-\-debug\fR] [\fB\-\-children\-max=\fR] [\fB\-\-exec\-delay=\fR] [\fB\-\-event\-timeout=\fR] [\fB\-\-resolve\-names=early|late|never\fR] [\fB\-\-version\fR] [\fB\-\-help\fR]
.SH "DESCRIPTION"
.PP
\fBsystemd\-udevd\fR
listens to kernel uevents\&. For every event, systemd\-udevd executes matching instructions specified in udev rules\&. See
\fBudev\fR(7)\&.
.PP
The behavior of the daemon can be configured using
\fBudev.conf\fR(5), its command line options, environment variables, and on the kernel command line, or changed dynamically with
\fBudevadm control\fR\&.
.SH "OPTIONS"
.PP
\fB\-\-daemon\fR
.RS 4
Detach and run in the background\&.
.RE
.PP
\fB\-\-debug\fR
.RS 4
Print debug messages to standard error\&.
.RE
.PP
\fB\-\-children\-max=\fR
.RS 4
Limit the number of events executed in parallel\&.
.RE
.PP
\fB\-\-exec\-delay=\fR
.RS 4
Delay the execution of
\fIRUN\fR
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\&.
.RE
.PP
\fB\-\-event\-timeout=\fR
.RS 4
Set the number of seconds to wait for events to finish\&. After this time the event will be terminated\&. The default is 30 seconds\&.
.RE
.PP
\fB\-\-resolve\-names=\fR
.RS 4
Specify when systemd\-udevd should resolve names of users and groups\&. When set to
\fBearly\fR
(the default), names will be resolved when the rules are parsed\&. When set to
\fBlate\fR, names will be resolved for every event\&. When set to
\fBnever\fR, names will never be resolved and all devices will be owned by root\&.
.RE
.PP
\fB\-\-help\fR
.RS 4
Print a short help text and exit\&.
.RE
.PP
\fB\-\-version\fR
.RS 4
Print a short version string and exit\&.
.RE
.SH "KERNEL COMMAND LINE"
.PP
Parameters starting with "rd\&." will be read when
\fBsystemd\-udevd\fR
is used in an initrd\&.
.PP
\fIudev\&.log\-priority=\fR, \fIrd\&.udev\&.log\-priority=\fR
.RS 4
Set the log level\&.
.RE
.PP
\fIudev\&.children\-max=\fR, \fIrd\&.udev\&.children\-max=\fR
.RS 4
Limit the number of events executed in parallel\&.
.RE
.PP
\fIudev\&.exec\-delay=\fR, \fIrd\&.udev\&.exec\-delay=\fR
.RS 4
Delay the execution of
\fIRUN\fR
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\&.
.RE
.PP
\fIudev\&.event\-timeout=\fR, \fIrd\&.udev\&.event\-timeout=\fR
.RS 4
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\&.
.RE
.PP
\fInet\&.ifnames=\fR
.RS 4
Network interfaces are renamed to give them predictable names when possible\&. It is enabled by default; specifying 0 disables it\&.
.RE
.SH "SEE ALSO"
.PP
\fBudev.conf\fR(5),
\fBudev\fR(7),
\fBudevadm\fR(8)