man/systemd-udevd.service.8

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   2 .TH "SYSTEMD\-UDEVD\&.SERVICE" "8" "" "systemd 208" "systemd-udevd.service"
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  22 .SH "NAME"
  23 systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-udevd \- Device event managing daemon
  24 .SH "SYNOPSIS"
  25 .PP
  26 systemd\-udevd\&.service
  27 .PP
  28 systemd\-udevd\-control\&.socket
  29 .PP
  30 systemd\-udevd\-kernel\&.socket
  31 .HP \w'\fB/usr/lib/systemd/systemd\-udevd\fR\ 'u
  32 \fB/usr/lib/systemd/systemd\-udevd\fR [\fB\-\-daemon\fR] [\fB\-\-debug\fR] [\fB\-\-children\-max=\fR] [\fB\-\-exec\-delay=\fR] [\fB\-\-resolve\-names=early|late|never\fR] [\fB\-\-version\fR] [\fB\-\-help\fR]
  33 .SH "DESCRIPTION"
  34 .PP
  35 \fBsystemd\-udevd\fR
  36 listens to kernel uevents\&. For every event, systemd\-udevd executes matching instructions specified in udev rules\&. See
  37 \fBudev\fR(7)\&.
  38 .PP
  39 The behavior of the running daemon can be changed with
  40 \fBudevadm control\fR\&.
  41 .SH "OPTIONS"
  42 .PP
  43 \fB\-\-daemon\fR
  44 .RS 4
  45 Detach and run in the background\&.
  46 .RE
  47 .PP
  48 \fB\-\-debug\fR
  49 .RS 4
  50 Print debug messages to stderr\&.
  51 .RE
  52 .PP
  53 \fB\-\-children\-max=\fR
  54 .RS 4
  55 Limit the number of events executed in parallel\&.
  56 .RE
  57 .PP
  58 \fB\-\-exec\-delay=\fR
  59 .RS 4
  60 Delay the execution of RUN instruction by the given number of seconds\&. This option might be useful when debugging system crashes during coldplug caused by loading non\-working kernel modules\&.
  61 .RE
  62 .PP
  63 \fB\-\-resolve\-names=\fR
  64 .RS 4
  65 Specify when systemd\-udevd should resolve names of users and groups\&. When set to
  66 \fBearly\fR
  67 (the default) names will be resolved when the rules are parsed\&. When set to
  68 \fBlate\fR
  69 names will be resolved for every event\&. When set to
  70 \fBnever\fR
  71 names will never be resolved and all devices will be owned by root\&.
  72 .RE
  73 .PP
  74 \fB\-\-version\fR
  75 .RS 4
  76 Print version number\&.
  77 .RE
  78 .PP
  79 \fB\-\-help\fR
  80 .RS 4
  81 Print help text\&.
  82 .RE
  83 .SH "ENVIRONMENT"
  84 .PP
  85 \fI$UDEV_LOG=\fR
  86 .RS 4
  87 Set the logging priority\&.
  88 .RE
  89 .SH "KERNEL COMMAND LINE"
  90 .PP
  91 Parameters starting with "rd\&." will be read when
  92 \fBsystemd\-udevd\fR
  93 is used in an initrd\&.
  94 .PP
  95 \fIudev\&.log\-priority=\fR, \fIrd\&.udev\&.log\-priority=\fR
  96 .RS 4
  97 Set the logging priority\&.
  98 .RE
  99 .PP
 100 \fIudev\&.children\-max=\fR, \fIrd\&.udev\&.children\-max=\fR
 101 .RS 4
 102 Limit the number of events executed in parallel\&.
 103 .RE
 104 .PP
 105 \fIudev\&.exec\-delay=\fR, \fIrd\&.udev\&.exec\-delay=\fR
 106 .RS 4
 107 Delay the execution of RUN instruction by the given number of seconds\&. This option might be useful when debugging system crashes during coldplug caused by loading non\-working kernel modules\&.
 108 .RE
 109 .PP
 110 \fInet\&.ifnames=\fR
 111 .RS 4
 112 Network interfaces are renamed to give them predictable names when possible\&. It is enabled by default, specifying 0 disables it\&.
 113 .RE
 114 .SH "CONFIGURATION FILE"
 115 .PP
 116 udev expects its main configuration file at
 117 /etc/udev/udev\&.conf\&. It consists of a set of variables allowing the user to override default udev values\&. All empty lines or lines beginning with \*(Aq#\*(Aq are ignored\&. The following variables can be set:
 118 .PP
 119 \fIudev_log\fR
 120 .RS 4
 121 The logging priority\&. Valid values are the numerical syslog priorities or their textual representations:
 122 \fBerr\fR,
 123 \fBinfo\fR
 124 and
 125 \fBdebug\fR\&.
 126 .RE
 127 .SH "SEE ALSO"
 128 .PP
 129 \fBudev\fR(7),
 130 \fBudevadm\fR(8)